Java学习笔记-Day82 Spring Boot框架（二）

一、Spring Boot的注解
二、自定义banner
三、Spring Boot整合SSM框架集
四、@Mapper和@Repository在Dao层的应用
五、Thymeleaf模板引擎
六、端口被占用的解决方法

一、Spring Boot的注解

（1）@SpringBootApplication：用于标识Spring Boot应用程序，代表当前类是一个Spring Boot启动类，而一个Spring Boot项目内有且只能有一个@SpringBootApplication注解存在。Spring Boot运行这个类的main方法时就会启动SpringBoot应用程序。

（2）@SpringBootConfiguration: Spring Boot的配置类，标注在类上表示当前类是一个Spring Boot的配置类。

（3）@Configuration：标注在类上表示当前类是一个配置类。配置类相当于配置文件。配置类也是容器中的一个组件。

（4）@Component：把组件实例化到Spring容器中。

（5）@EnableAutoConfiguration：开启自动配置功能。当我们需要Spring Boot帮我们自动配置所需要的配置，@EnableAutoConfiguration告诉Spring Boot开启自动配置功能，这时Spring Boot会自动配置好，并使之生效。

（6）@AutoConfigurationPackage：自动配置包。

（7）@Import： Spring的底层注解，导入一个组件到容器中。

@Import(AutoConfigurationPackages.Registrar.class)：由AutoConfigurationPackages.Registrar.class将主配置类（标注@SpringBootApplication注解的类）的所在目录的包及下面所有子包里面的所有组件扫描到Spring容器。
@Import(EnableAutoConfigurationImportSelector.class) ：EnableAutoConfigurationImportSelector（组件的选择器）将所有需要导入的组件以全类名的方式返回，这些组件就会被添加到容器中。组件的选择器给容器中导入非常多的自动配置类（xxxAutoConfiguration），给容器中导入这个场景需要的所有组件，并配置好这些组件。

（9）@ComponentScan：根据定义的扫描路径，将符合扫描规则的类装配到Spring容器中。

二、自定义banner

在Spring Boot项目的 src/main/resources 文件夹中创建一个banner.txt文件，写入ASCII字符画，就能替换默认的banner。
在这里插入图片描述

banner.txt

//                          _ooOoo_                               //
//                         o8888888o                              //
//                         88" . "88                              //
//                         (| ^_^ |)                              //
//                         O\  =  /O                              //
//                      ____/`---'\____                           //
//                    .'  \\|     |//  `.                         //
//                   /  \\|||  :  |||//  \                        //
//                  /  _||||| -:- |||||-  \                       //
//                  |   | \\\  -  /// |   |                       //
//                  | \_|  ''\---/''  |   |                       //
//                  \  .-\__  `-`  ___/-. /                       //
//                ___`. .'  /--.--\  `. . ___                     //
//              ."" '<  `.___\_<|>_/___.'  >'"".                  //
//            | | :  `- \`.;`\ _ /`;.`/ - ` : | |                 //
//            \  \ `-.   \_ __\ /__ _/   .-` /  /                 //
//      ========`-.____`-.___\_____/___.-`____.-'========         //
//                           `=---='                              //
//      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^        //
//             佛祖保佑          永无BUG         永不修改                	  //

在这里插入图片描述

三、Spring Boot整合SSM框架集

（1）点击 New -> 点击 project -> 选择Spring Intializr -> 选择项目的Project SDK -> Choose starter service URL选择Default（https://start.spring.io）-> 点击Next。

在这里插入图片描述

（2）修改Java Version为对应的8版本（jdk1.8）。

在这里插入图片描述
（3）Web选择Spring Web，SQL选择Mybatis Framework和MySQL Driver，点击Next。

（4）输入项目名称和项目路径，点击Finish完成。

（5）在src目录下创建com.etc.ssm.entity包，并在该包下创建实体类。

User.java

package com.etc.ssm.entity;

import java.io.Serializable;
import java.util.Date;

public class User implements Serializable {
    
    
    private Integer userid;
    private String username;
    private String userphone;
    private String userpwd;
    private Integer userage;
    private Integer usersex;
    private Date userregistertime;
    private Integer ustatus;
    private String userpictureurl;
    private static final long serialVersionUID = 1L;
    public Integer getUserid() {
    
    
        return userid;
    }
    public void setUserid(Integer userid) {
    
    
        this.userid = userid;
    }
    public String getUsername() {
    
    
        return username;
    }
    public void setUsername(String username) {
    
    
        this.username = username;
    }
    public String getUserphone() {
    
    
        return userphone;
    }
    public void setUserphone(String userphone) {
    
    
        this.userphone = userphone;
    }
    public String getUserpwd() {
    
    
        return userpwd;
    }
    public void setUserpwd(String userpwd) {
    
    
        this.userpwd = userpwd;
    }
    public Integer getUserage() {
    
    
        return userage;
    }
    public void setUserage(Integer userage) {
    
    
        this.userage = userage;
    }
    public Integer getUsersex() {
    
    
        return usersex;
    }
    public void setUsersex(Integer usersex) {
    
    
        this.usersex = usersex;
    }
    public Date getUserregistertime() {
    
    
        return userregistertime;
    }
    public void setUserregistertime(Date userregistertime) {
    
    
        this.userregistertime = userregistertime;
    }
    public Integer getUstatus() {
    
    
        return ustatus;
    }
    public void setUstatus(Integer ustatus) {
    
    
        this.ustatus = ustatus;
    }
    public String getUserpictureurl() {
    
    
        return userpictureurl;
    }
    public void setUserpictureurl(String userpictureurl) {
    
    
        this.userpictureurl = userpictureurl;
    }


	public User(String username, String userphone, String userpwd, Integer userage, Integer usersex,
                Date userregistertime, Integer ustatus, String userpictureurl) {
    
    
		super();
		this.username = username;
		this.userphone = userphone;
		this.userpwd = userpwd;
		this.userage = userage;
		this.usersex = usersex;
		this.userregistertime = userregistertime;
		this.ustatus = ustatus;
		this.userpictureurl = userpictureurl;
	}

	public User(String username, String userphone, String userpwd, Integer userage, Integer usersex,
                String userpictureurl) {
    
    
		super();
		this.username = username;
		this.userphone = userphone;
		this.userpwd = userpwd;
		this.userage = userage;
		this.usersex = usersex;
		this.userpictureurl = userpictureurl;
	}

	public User(Integer userid, String username, String userphone, String userpwd, Integer userage, Integer usersex,
                String userpictureurl) {
    
    
		super();
		this.userid = userid;
		this.username = username;
		this.userphone = userphone;
		this.userpwd = userpwd;
		this.userage = userage;
		this.usersex = usersex;
		this.userpictureurl = userpictureurl;
	}
    public User() {
    
    
		// TODO Auto-generated constructor stub
	}

    @Override
    public String toString() {
    
    
        StringBuilder sb = new StringBuilder();
        sb.append(getClass().getSimpleName());
        sb.append(" [");
        sb.append("Hash = ").append(hashCode());
        sb.append(", userid=").append(userid);
        sb.append(", username=").append(username);
        sb.append(", userphone=").append(userphone);
        sb.append(", userpwd=").append(userpwd);
        sb.append(", userage=").append(userage);
        sb.append(", usersex=").append(usersex);
        sb.append(", userregistertime=").append(userregistertime);
        sb.append(", ustatus=").append(ustatus);
        sb.append(", userpictureurl=").append(userpictureurl);
        sb.append(", serialVersionUID=").append(serialVersionUID);
        sb.append("]");
        return sb.toString();
    }
    
}

UserExample .java

package com.etc.ssm.entity;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;

public class UserExample {
    
    
    protected String orderByClause;
    protected boolean distinct;
    protected List<Criteria> oredCriteria;
    public UserExample() {
    
    
        oredCriteria = new ArrayList<Criteria>();
    }
    public void setOrderByClause(String orderByClause) {
    
    
        this.orderByClause = orderByClause;
    }
    public String getOrderByClause() {
    
    
        return orderByClause;
    }
    public void setDistinct(boolean distinct) {
    
    
        this.distinct = distinct;
    }
    public boolean isDistinct() {
    
    
        return distinct;
    }
    public List<Criteria> getOredCriteria() {
    
    
        return oredCriteria;
    }
    public void or(Criteria criteria) {
    
    
        oredCriteria.add(criteria);
    }
    public Criteria or() {
    
    
        Criteria criteria = createCriteriaInternal();
        oredCriteria.add(criteria);
        return criteria;
    }
    public Criteria createCriteria() {
    
    
        Criteria criteria = createCriteriaInternal();
        if (oredCriteria.size() == 0) {
    
    
            oredCriteria.add(criteria);
        }
        return criteria;
    }
    protected Criteria createCriteriaInternal() {
    
    
        Criteria criteria = new Criteria();
        return criteria;
    }
    public void clear() {
    
    
        oredCriteria.clear();
        orderByClause = null;
        distinct = false;
    }
    protected abstract static class GeneratedCriteria {
    
    
        protected List<Criterion> criteria;

        protected GeneratedCriteria() {
    
    
            super();
            criteria = new ArrayList<Criterion>();
        }

        public boolean isValid() {
    
    
            return criteria.size() > 0;
        }

        public List<Criterion> getAllCriteria() {
    
    
            return criteria;
        }

        public List<Criterion> getCriteria() {
    
    
            return criteria;
        }

        protected void addCriterion(String condition) {
    
    
            if (condition == null) {
    
    
                throw new RuntimeException("Value for condition cannot be null");
            }
            criteria.add(new Criterion(condition));
        }

        protected void addCriterion(String condition, Object value, String property) {
    
    
            if (value == null) {
    
    
                throw new RuntimeException("Value for " + property + " cannot be null");
            }
            criteria.add(new Criterion(condition, value));
        }

        protected void addCriterion(String condition, Object value1, Object value2, String property) {
    
    
            if (value1 == null || value2 == null) {
    
    
                throw new RuntimeException("Between values for " + property + " cannot be null");
            }
            criteria.add(new Criterion(condition, value1, value2));
        }

        public Criteria andUseridIsNull() {
    
    
            addCriterion("userid is null");
            return (Criteria) this;
        }

        public Criteria andUseridIsNotNull() {
    
    
            addCriterion("userid is not null");
            return (Criteria) this;
        }

        public Criteria andUseridEqualTo(Integer value) {
    
    
            addCriterion("userid =", value, "userid");
            return (Criteria) this;
        }

        public Criteria andUseridNotEqualTo(Integer value) {
    
    
            addCriterion("userid <>", value, "userid");
            return (Criteria) this;
        }

        public Criteria andUseridGreaterThan(Integer value) {
    
    
            addCriterion("userid >", value, "userid");
            return (Criteria) this;
        }

        public Criteria andUseridGreaterThanOrEqualTo(Integer value) {
    
    
            addCriterion("userid >=", value, "userid");
            return (Criteria) this;
        }

        public Criteria andUseridLessThan(Integer value) {
    
    
            addCriterion("userid <", value, "userid");
            return (Criteria) this;
        }

        public Criteria andUseridLessThanOrEqualTo(Integer value) {
    
    
            addCriterion("userid <=", value, "userid");
            return (Criteria) this;
        }

        public Criteria andUseridIn(List<Integer> values) {
    
    
            addCriterion("userid in", values, "userid");
            return (Criteria) this;
        }

        public Criteria andUseridNotIn(List<Integer> values) {
    
    
            addCriterion("userid not in", values, "userid");
            return (Criteria) this;
        }

        public Criteria andUseridBetween(Integer value1, Integer value2) {
    
    
            addCriterion("userid between", value1, value2, "userid");
            return (Criteria) this;
        }

        public Criteria andUseridNotBetween(Integer value1, Integer value2) {
    
    
            addCriterion("userid not between", value1, value2, "userid");
            return (Criteria) this;
        }

        public Criteria andUsernameIsNull() {
    
    
            addCriterion("username is null");
            return (Criteria) this;
        }

        public Criteria andUsernameIsNotNull() {
    
    
            addCriterion("username is not null");
            return (Criteria) this;
        }

        public Criteria andUsernameEqualTo(String value) {
    
    
            addCriterion("username =", value, "username");
            return (Criteria) this;
        }

        public Criteria andUsernameNotEqualTo(String value) {
    
    
            addCriterion("username <>", value, "username");
            return (Criteria) this;
        }

        public Criteria andUsernameGreaterThan(String value) {
    
    
            addCriterion("username >", value, "username");
            return (Criteria) this;
        }

        public Criteria andUsernameGreaterThanOrEqualTo(String value) {
    
    
            addCriterion("username >=", value, "username");
            return (Criteria) this;
        }

        public Criteria andUsernameLessThan(String value) {
    
    
            addCriterion("username <", value, "username");
            return (Criteria) this;
        }

        public Criteria andUsernameLessThanOrEqualTo(String value) {
    
    
            addCriterion("username <=", value, "username");
            return (Criteria) this;
        }

        public Criteria andUsernameLike(String value) {
    
    
            addCriterion("username like", value, "username");
            return (Criteria) this;
        }

        public Criteria andUsernameNotLike(String value) {
    
    
            addCriterion("username not like", value, "username");
            return (Criteria) this;
        }

        public Criteria andUsernameIn(List<String> values) {
    
    
            addCriterion("username in", values, "username");
            return (Criteria) this;
        }

        public Criteria andUsernameNotIn(List<String> values) {
    
    
            addCriterion("username not in", values, "username");
            return (Criteria) this;
        }

        public Criteria andUsernameBetween(String value1, String value2) {
    
    
            addCriterion("username between", value1, value2, "username");
            return (Criteria) this;
        }

        public Criteria andUsernameNotBetween(String value1, String value2) {
    
    
            addCriterion("username not between", value1, value2, "username");
            return (Criteria) this;
        }

        public Criteria andUserphoneIsNull() {
    
    
            addCriterion("userphone is null");
            return (Criteria) this;
        }

        public Criteria andUserphoneIsNotNull() {
    
    
            addCriterion("userphone is not null");
            return (Criteria) this;
        }

        public Criteria andUserphoneEqualTo(String value) {
    
    
            addCriterion("userphone =", value, "userphone");
            return (Criteria) this;
        }

        public Criteria andUserphoneNotEqualTo(String value) {
    
    
            addCriterion("userphone <>", value, "userphone");
            return (Criteria) this;
        }

        public Criteria andUserphoneGreaterThan(String value) {
    
    
            addCriterion("userphone >", value, "userphone");
            return (Criteria) this;
        }

        public Criteria andUserphoneGreaterThanOrEqualTo(String value) {
    
    
            addCriterion("userphone >=", value, "userphone");
            return (Criteria) this;
        }

        public Criteria andUserphoneLessThan(String value) {
    
    
            addCriterion("userphone <", value, "userphone");
            return (Criteria) this;
        }

        public Criteria andUserphoneLessThanOrEqualTo(String value) {
    
    
            addCriterion("userphone <=", value, "userphone");
            return (Criteria) this;
        }

        public Criteria andUserphoneLike(String value) {
    
    
            addCriterion("userphone like", value, "userphone");
            return (Criteria) this;
        }

        public Criteria andUserphoneNotLike(String value) {
    
    
            addCriterion("userphone not like", value, "userphone");
            return (Criteria) this;
        }

        public Criteria andUserphoneIn(List<String> values) {
    
    
            addCriterion("userphone in", values, "userphone");
            return (Criteria) this;
        }

        public Criteria andUserphoneNotIn(List<String> values) {
    
    
            addCriterion("userphone not in", values, "userphone");
            return (Criteria) this;
        }

        public Criteria andUserphoneBetween(String value1, String value2) {
    
    
            addCriterion("userphone between", value1, value2, "userphone");
            return (Criteria) this;
        }

        public Criteria andUserphoneNotBetween(String value1, String value2) {
    
    
            addCriterion("userphone not between", value1, value2, "userphone");
            return (Criteria) this;
        }

        public Criteria andUserpwdIsNull() {
    
    
            addCriterion("userpwd is null");
            return (Criteria) this;
        }

        public Criteria andUserpwdIsNotNull() {
    
    
            addCriterion("userpwd is not null");
            return (Criteria) this;
        }

        public Criteria andUserpwdEqualTo(String value) {
    
    
            addCriterion("userpwd =", value, "userpwd");
            return (Criteria) this;
        }

        public Criteria andUserpwdNotEqualTo(String value) {
    
    
            addCriterion("userpwd <>", value, "userpwd");
            return (Criteria) this;
        }

        public Criteria andUserpwdGreaterThan(String value) {
    
    
            addCriterion("userpwd >", value, "userpwd");
            return (Criteria) this;
        }

        public Criteria andUserpwdGreaterThanOrEqualTo(String value) {
    
    
            addCriterion("userpwd >=", value, "userpwd");
            return (Criteria) this;
        }

        public Criteria andUserpwdLessThan(String value) {
    
    
            addCriterion("userpwd <", value, "userpwd");
            return (Criteria) this;
        }

        public Criteria andUserpwdLessThanOrEqualTo(String value) {
    
    
            addCriterion("userpwd <=", value, "userpwd");
            return (Criteria) this;
        }

        public Criteria andUserpwdLike(String value) {
    
    
            addCriterion("userpwd like", value, "userpwd");
            return (Criteria) this;
        }

        public Criteria andUserpwdNotLike(String value) {
    
    
            addCriterion("userpwd not like", value, "userpwd");
            return (Criteria) this;
        }

        public Criteria andUserpwdIn(List<String> values) {
    
    
            addCriterion("userpwd in", values, "userpwd");
            return (Criteria) this;
        }

        public Criteria andUserpwdNotIn(List<String> values) {
    
    
            addCriterion("userpwd not in", values, "userpwd");
            return (Criteria) this;
        }

        public Criteria andUserpwdBetween(String value1, String value2) {
    
    
            addCriterion("userpwd between", value1, value2, "userpwd");
            return (Criteria) this;
        }

        public Criteria andUserpwdNotBetween(String value1, String value2) {
    
    
            addCriterion("userpwd not between", value1, value2, "userpwd");
            return (Criteria) this;
        }

        public Criteria andUserageIsNull() {
    
    
            addCriterion("userage is null");
            return (Criteria) this;
        }

        public Criteria andUserageIsNotNull() {
    
    
            addCriterion("userage is not null");
            return (Criteria) this;
        }

        public Criteria andUserageEqualTo(Integer value) {
    
    
            addCriterion("userage =", value, "userage");
            return (Criteria) this;
        }

        public Criteria andUserageNotEqualTo(Integer value) {
    
    
            addCriterion("userage <>", value, "userage");
            return (Criteria) this;
        }

        public Criteria andUserageGreaterThan(Integer value) {
    
    
            addCriterion("userage >", value, "userage");
            return (Criteria) this;
        }

        public Criteria andUserageGreaterThanOrEqualTo(Integer value) {
    
    
            addCriterion("userage >=", value, "userage");
            return (Criteria) this;
        }

        public Criteria andUserageLessThan(Integer value) {
    
    
            addCriterion("userage <", value, "userage");
            return (Criteria) this;
        }

        public Criteria andUserageLessThanOrEqualTo(Integer value) {
    
    
            addCriterion("userage <=", value, "userage");
            return (Criteria) this;
        }

        public Criteria andUserageIn(List<Integer> values) {
    
    
            addCriterion("userage in", values, "userage");
            return (Criteria) this;
        }

        public Criteria andUserageNotIn(List<Integer> values) {
    
    
            addCriterion("userage not in", values, "userage");
            return (Criteria) this;
        }

        public Criteria andUserageBetween(Integer value1, Integer value2) {
    
    
            addCriterion("userage between", value1, value2, "userage");
            return (Criteria) this;
        }

        public Criteria andUserageNotBetween(Integer value1, Integer value2) {
    
    
            addCriterion("userage not between", value1, value2, "userage");
            return (Criteria) this;
        }

        public Criteria andUsersexIsNull() {
    
    
            addCriterion("usersex is null");
            return (Criteria) this;
        }

        public Criteria andUsersexIsNotNull() {
    
    
            addCriterion("usersex is not null");
            return (Criteria) this;
        }

        public Criteria andUsersexEqualTo(Integer value) {
    
    
            addCriterion("usersex =", value, "usersex");
            return (Criteria) this;
        }

        public Criteria andUsersexNotEqualTo(Integer value) {
    
    
            addCriterion("usersex <>", value, "usersex");
            return (Criteria) this;
        }

        public Criteria andUsersexGreaterThan(Integer value) {
    
    
            addCriterion("usersex >", value, "usersex");
            return (Criteria) this;
        }

        public Criteria andUsersexGreaterThanOrEqualTo(Integer value) {
    
    
            addCriterion("usersex >=", value, "usersex");
            return (Criteria) this;
        }

        public Criteria andUsersexLessThan(Integer value) {
    
    
            addCriterion("usersex <", value, "usersex");
            return (Criteria) this;
        }

        public Criteria andUsersexLessThanOrEqualTo(Integer value) {
    
    
            addCriterion("usersex <=", value, "usersex");
            return (Criteria) this;
        }

        public Criteria andUsersexIn(List<Integer> values) {
    
    
            addCriterion("usersex in", values, "usersex");
            return (Criteria) this;
        }

        public Criteria andUsersexNotIn(List<Integer> values) {
    
    
            addCriterion("usersex not in", values, "usersex");
            return (Criteria) this;
        }

        public Criteria andUsersexBetween(Integer value1, Integer value2) {
    
    
            addCriterion("usersex between", value1, value2, "usersex");
            return (Criteria) this;
        }

        public Criteria andUsersexNotBetween(Integer value1, Integer value2) {
    
    
            addCriterion("usersex not between", value1, value2, "usersex");
            return (Criteria) this;
        }

        public Criteria andUserregistertimeIsNull() {
    
    
            addCriterion("userregistertime is null");
            return (Criteria) this;
        }

        public Criteria andUserregistertimeIsNotNull() {
    
    
            addCriterion("userregistertime is not null");
            return (Criteria) this;
        }

        public Criteria andUserregistertimeEqualTo(Date value) {
    
    
            addCriterion("userregistertime =", value, "userregistertime");
            return (Criteria) this;
        }

        public Criteria andUserregistertimeNotEqualTo(Date value) {
    
    
            addCriterion("userregistertime <>", value, "userregistertime");
            return (Criteria) this;
        }

        public Criteria andUserregistertimeGreaterThan(Date value) {
    
    
            addCriterion("userregistertime >", value, "userregistertime");
            return (Criteria) this;
        }

        public Criteria andUserregistertimeGreaterThanOrEqualTo(Date value) {
    
    
            addCriterion("userregistertime >=", value, "userregistertime");
            return (Criteria) this;
        }

        public Criteria andUserregistertimeLessThan(Date value) {
    
    
            addCriterion("userregistertime <", value, "userregistertime");
            return (Criteria) this;
        }

        public Criteria andUserregistertimeLessThanOrEqualTo(Date value) {
    
    
            addCriterion("userregistertime <=", value, "userregistertime");
            return (Criteria) this;
        }

        public Criteria andUserregistertimeIn(List<Date> values) {
    
    
            addCriterion("userregistertime in", values, "userregistertime");
            return (Criteria) this;
        }

        public Criteria andUserregistertimeNotIn(List<Date> values) {
    
    
            addCriterion("userregistertime not in", values, "userregistertime");
            return (Criteria) this;
        }

        public Criteria andUserregistertimeBetween(Date value1, Date value2) {
    
    
            addCriterion("userregistertime between", value1, value2, "userregistertime");
            return (Criteria) this;
        }

        public Criteria andUserregistertimeNotBetween(Date value1, Date value2) {
    
    
            addCriterion("userregistertime not between", value1, value2, "userregistertime");
            return (Criteria) this;
        }

        public Criteria andUstatusIsNull() {
    
    
            addCriterion("ustatus is null");
            return (Criteria) this;
        }

        public Criteria andUstatusIsNotNull() {
    
    
            addCriterion("ustatus is not null");
            return (Criteria) this;
        }

        public Criteria andUstatusEqualTo(Integer value) {
    
    
            addCriterion("ustatus =", value, "ustatus");
            return (Criteria) this;
        }

        public Criteria andUstatusNotEqualTo(Integer value) {
    
    
            addCriterion("ustatus <>", value, "ustatus");
            return (Criteria) this;
        }

        public Criteria andUstatusGreaterThan(Integer value) {
    
    
            addCriterion("ustatus >", value, "ustatus");
            return (Criteria) this;
        }

        public Criteria andUstatusGreaterThanOrEqualTo(Integer value) {
    
    
            addCriterion("ustatus >=", value, "ustatus");
            return (Criteria) this;
        }

        public Criteria andUstatusLessThan(Integer value) {
    
    
            addCriterion("ustatus <", value, "ustatus");
            return (Criteria) this;
        }

        public Criteria andUstatusLessThanOrEqualTo(Integer value) {
    
    
            addCriterion("ustatus <=", value, "ustatus");
            return (Criteria) this;
        }

        public Criteria andUstatusIn(List<Integer> values) {
    
    
            addCriterion("ustatus in", values, "ustatus");
            return (Criteria) this;
        }

        public Criteria andUstatusNotIn(List<Integer> values) {
    
    
            addCriterion("ustatus not in", values, "ustatus");
            return (Criteria) this;
        }

        public Criteria andUstatusBetween(Integer value1, Integer value2) {
    
    
            addCriterion("ustatus between", value1, value2, "ustatus");
            return (Criteria) this;
        }

        public Criteria andUstatusNotBetween(Integer value1, Integer value2) {
    
    
            addCriterion("ustatus not between", value1, value2, "ustatus");
            return (Criteria) this;
        }

        public Criteria andUserpictureurlIsNull() {
    
    
            addCriterion("userpictureurl is null");
            return (Criteria) this;
        }

        public Criteria andUserpictureurlIsNotNull() {
    
    
            addCriterion("userpictureurl is not null");
            return (Criteria) this;
        }

        public Criteria andUserpictureurlEqualTo(String value) {
    
    
            addCriterion("userpictureurl =", value, "userpictureurl");
            return (Criteria) this;
        }

        public Criteria andUserpictureurlNotEqualTo(String value) {
    
    
            addCriterion("userpictureurl <>", value, "userpictureurl");
            return (Criteria) this;
        }

        public Criteria andUserpictureurlGreaterThan(String value) {
    
    
            addCriterion("userpictureurl >", value, "userpictureurl");
            return (Criteria) this;
        }

        public Criteria andUserpictureurlGreaterThanOrEqualTo(String value) {
    
    
            addCriterion("userpictureurl >=", value, "userpictureurl");
            return (Criteria) this;
        }

        public Criteria andUserpictureurlLessThan(String value) {
    
    
            addCriterion("userpictureurl <", value, "userpictureurl");
            return (Criteria) this;
        }

        public Criteria andUserpictureurlLessThanOrEqualTo(String value) {
    
    
            addCriterion("userpictureurl <=", value, "userpictureurl");
            return (Criteria) this;
        }

        public Criteria andUserpictureurlLike(String value) {
    
    
            addCriterion("userpictureurl like", value, "userpictureurl");
            return (Criteria) this;
        }

        public Criteria andUserpictureurlNotLike(String value) {
    
    
            addCriterion("userpictureurl not like", value, "userpictureurl");
            return (Criteria) this;
        }

        public Criteria andUserpictureurlIn(List<String> values) {
    
    
            addCriterion("userpictureurl in", values, "userpictureurl");
            return (Criteria) this;
        }

        public Criteria andUserpictureurlNotIn(List<String> values) {
    
    
            addCriterion("userpictureurl not in", values, "userpictureurl");
            return (Criteria) this;
        }

        public Criteria andUserpictureurlBetween(String value1, String value2) {
    
    
            addCriterion("userpictureurl between", value1, value2, "userpictureurl");
            return (Criteria) this;
        }

        public Criteria andUserpictureurlNotBetween(String value1, String value2) {
    
    
            addCriterion("userpictureurl not between", value1, value2, "userpictureurl");
            return (Criteria) this;
        }
    }

    /**
     * This class was generated by MyBatis Generator.
     * This class corresponds to the database table t_user
     *
     * @mbg.generated do_not_delete_during_merge Wed Mar 10 10:47:38 CST 2021
     */
    public static class Criteria extends GeneratedCriteria {
    
    

        protected Criteria() {
    
    
            super();
        }
    }
    public static class Criterion {
    
    
        private String condition;

        private Object value;

        private Object secondValue;

        private boolean noValue;

        private boolean singleValue;

        private boolean betweenValue;

        private boolean listValue;

        private String typeHandler;

        public String getCondition() {
    
    
            return condition;
        }

        public Object getValue() {
    
    
            return value;
        }

        public Object getSecondValue() {
    
    
            return secondValue;
        }

        public boolean isNoValue() {
    
    
            return noValue;
        }

        public boolean isSingleValue() {
    
    
            return singleValue;
        }

        public boolean isBetweenValue() {
    
    
            return betweenValue;
        }

        public boolean isListValue() {
    
    
            return listValue;
        }

        public String getTypeHandler() {
    
    
            return typeHandler;
        }

        protected Criterion(String condition) {
    
    
            super();
            this.condition = condition;
            this.typeHandler = null;
            this.noValue = true;
        }

        protected Criterion(String condition, Object value, String typeHandler) {
    
    
            super();
            this.condition = condition;
            this.value = value;
            this.typeHandler = typeHandler;
            if (value instanceof List<?>) {
    
    
                this.listValue = true;
            } else {
    
    
                this.singleValue = true;
            }
        }
        protected Criterion(String condition, Object value) {
    
    
            this(condition, value, null);
        }
        protected Criterion(String condition, Object value, Object secondValue, String typeHandler) {
    
    
            super();
            this.condition = condition;
            this.value = value;
            this.secondValue = secondValue;
            this.typeHandler = typeHandler;
            this.betweenValue = true;
        }
        protected Criterion(String condition, Object value, Object secondValue) {
    
    
            this(condition, value, secondValue, null);
        }
    }
}

（6）在src目录下创建com.etc.ssm.dao包，并在该包下创建Dao类。

package com.etc.ssm.dao;

import java.util.List;

import com.etc.ssm.entity.User;
import com.etc.ssm.entity.UserExample;
import org.springframework.stereotype.Repository;

@Repository
//Mapper
public interface UserMapper {
    
    
    List<User> selectByExample(UserExample example);
}

（7）在resource目录下创建mapper文件夹，并在该文件夹中创建xxxMapper.xml文件。

UserMapper.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.etc.ssm.dao.UserMapper">
    <resultMap id="BaseResultMap" type="com.etc.ssm.entity.User">
        <!--
          WARNING - @mbg.generated
          This element is automatically generated by MyBatis Generator, do not modify.
          This element was generated on Wed Mar 10 10:47:38 CST 2021.
        -->
        <id column="userid" jdbcType="INTEGER" property="userid" />
        <result column="username" jdbcType="VARCHAR" property="username" />
        <result column="userphone" jdbcType="VARCHAR" property="userphone" />
        <result column="userpwd" jdbcType="VARCHAR" property="userpwd" />
        <result column="userage" jdbcType="INTEGER" property="userage" />
        <result column="usersex" jdbcType="INTEGER" property="usersex" />
        <result column="userregistertime" jdbcType="TIMESTAMP" property="userregistertime" />
        <result column="ustatus" jdbcType="INTEGER" property="ustatus" />
        <result column="userpictureurl" jdbcType="VARCHAR" property="userpictureurl" />
    </resultMap>
    <sql id="Example_Where_Clause">
        <!--
          WARNING - @mbg.generated
          This element is automatically generated by MyBatis Generator, do not modify.
          This element was generated on Wed Mar 10 10:47:38 CST 2021.
        -->
        <where>
            <foreach collection="oredCriteria" item="criteria" separator="or">
                <if test="criteria.valid">
                    <trim prefix="(" prefixOverrides="and" suffix=")">
                        <foreach collection="criteria.criteria" item="criterion">
                            <choose>
                                <when test="criterion.noValue">
                                    and ${
    
    criterion.condition}
                                </when>
                                <when test="criterion.singleValue">
                                    and ${
    
    criterion.condition} #{
    
    criterion.value}
                                </when>
                                <when test="criterion.betweenValue">
                                    and ${
    
    criterion.condition} #{
    
    criterion.value} and #{
    
    criterion.secondValue}
                                </when>
                                <when test="criterion.listValue">
                                    and ${
    
    criterion.condition}
                                    <foreach close=")" collection="criterion.value" item="listItem" open="(" separator=",">
                                        #{
    
    listItem}
                                    </foreach>
                                </when>
                            </choose>
                        </foreach>
                    </trim>
                </if>
            </foreach>
        </where>
    </sql>
    <sql id="Base_Column_List">
        <!--
          WARNING - @mbg.generated
          This element is automatically generated by MyBatis Generator, do not modify.
          This element was generated on Wed Mar 10 10:47:38 CST 2021.
        -->
        userid, username, userphone, userpwd, userage, usersex, userregistertime, ustatus,
        userpictureurl
    </sql>
    <select id="selectByExample" parameterType="com.etc.ssm.entity.UserExample" resultMap="BaseResultMap">
        <!--
          WARNING - @mbg.generated
          This element is automatically generated by MyBatis Generator, do not modify.
          This element was generated on Wed Mar 10 10:47:38 CST 2021.
        -->
        select
        <if test="distinct">
            distinct
        </if>
        <include refid="Base_Column_List" />
        from t_user
        <if test="_parameter != null">
            <include refid="Example_Where_Clause" />
        </if>
        <if test="orderByClause != null">
            order by ${
    
    orderByClause}
        </if>
    </select>
</mapper>

（8）配置applicationContext.xml文件。

applicationContext.xml

#修改tomcat的端口
server.port=8080
#数据库连接配置
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/bookdb?serverTimezone=Asia/Shanghai
spring.datasource.username=root
spring.datasource.password=root
#指定mybatis中配置的映射文件的地址
mybatis.mapper-locations=classpath:/mapper/*.xml
##日志配置
logging.level.com.etc.ssm.dao=DEBUG
logging.pattern.console=%d{yyyy/MM/dd-HH:mm:ss} [%thread] %-5level %logger- %msg%n
logging.pattern.file=%d{yyyy/MM/dd-HH:mm} [%thread] %-5level %logger- %msg%n

（9）在test/java/com/etc/ssm目录下创建测试类。

package com.etc.ssm;

import com.etc.ssm.dao.UserMapper;
import com.etc.ssm.entity.UserExample;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

@SpringBootTest
class DemoApplicationTests {
    
    
    @Autowired
    UserMapper userMapper;

    @Test
    void contextLoadsAll() {
    
    
        UserExample userExample = new UserExample();
        userExample.createCriteria().andUsernameLike("%%");
        System.out.println(userMapper.selectByExample(userExample));
    }
}

运行测试类的结果如下：

在这里插入图片描述

（10）在src目录下创建com.etc.ssm.service包，并在该包下创建Service类。

UserService.java

package com.etc.ssm.service;

import com.etc.ssm.entity.User;
import java.util.List;

public interface UserService {
    
    
    public List<User> getUserAll();
}

（11）在src目录下创建com.etc.ssm.service.impl包，并在该包下创建Service实现类。

UserServiceImpl.java

package com.etc.ssm.service.impl;

import com.etc.ssm.dao.UserMapper;
import com.etc.ssm.entity.User;
import com.etc.ssm.entity.UserExample;
import com.etc.ssm.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;

@Service
public class UserServiceImpl implements UserService {
    
    
    @Autowired
    UserMapper userMapper;

    @Override
    public List<User> getUserAll() {
    
    
        UserExample userExample = new UserExample();
        userExample.createCriteria().andUsernameLike("%%");
        return userMapper.selectByExample(userExample);
    }

}

（12）在src目录下创建com.etc.ssm.controller包，并在该包下创建Controller实现类。

package com.etc.ssm.controller;

import com.etc.ssm.entity.User;
import com.etc.ssm.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.List;

@RestController
public class UserController {
    
    
    @Autowired
    UserService userService;

    @GetMapping("api/user/all")
    public List<User> getUser(){
    
    
        return userService.getUserAll();
    }
}

（13）在src/com/etc/ssm目录下创建DemoApplication.java文件（Spring Boot启动类）。

package com.etc.ssm;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@MapperScan("com.etc.ssm.dao")
public class DemoApplication {
    
    
    public static void main(String[] args) {
    
    
        SpringApplication.run(DemoApplication.class, args);
    }
}

运行DemoApplication.java文件，启动Spring Boot项目。

在这里插入图片描述

四、@Mapper和@Repository在Dao层的应用

@Mapper是mybatis自身带的注解，使用@Mapper后，不需要在spring配置中设置扫描包地址，而是通过mapper.xml里面的namespace属性对应相关的mapper类，Spring 将动态生成Bean，并将其注入到Service层。

package com.etc.ssm;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class DemoApplication {
    
    
    public static void main(String[] args) {
    
    
        SpringApplication.run(DemoApplication.class, args);
    }
}

@Repository是Spring的注解，需要在Spring中配置扫描包地址，然后生成Dao层的bean，之后将其注入到Service层。如果使用@Repository注解，则Spring Boot程序启动入口（DemoApplication类）需要加入@MapperScan(“comm.etc.ssm.dao”)。

package com.etc.ssm;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@MapperScan("com.etc.ssm.dao")
public class DemoApplication {
    
    
    public static void main(String[] args) {
    
    
        SpringApplication.run(DemoApplication.class, args);
    }
}

五、Thymeleaf模板引擎

Thymeleaf是一款用于渲染XML/XHTML/HTML5内容的模板引擎，类似JSP，Velocity，FreeMaker等，它也可以轻易的与Spring MVC等Web框架进行集成作为Web应用的模板引擎。

Thymeleaf 在有网络和无网络的环境下皆可运行，即它可以让美工在浏览器查看页面的静态效果，也可以让程序员在服务器查看带数据的动态页面效果。这是由于它支持 html 原型，然后在 html 标签里增加额外的属性来达到模板+数据的展示方式。浏览器解释 html 时会忽略未定义的标签属性，所以 thymeleaf 的模板可以静态地运行；当有数据返回到页面时，Thymeleaf 标签会动态地替换掉静态内容，使页面动态显示。

Thymeleaf 开箱即用的特性。它提供标准和spring标准两种方言，可以直接套用模板实现JSTL、 OGNL表达式效果，避免每天套模板、改jstl、改标签的困扰。同时开发人员也可以扩展和创建自定义的方言。

操作步骤：
（1）在pom.xml添加thymeleaf依赖。

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>

（2）在applicationContexy.xml文件中配置thymeleaf。

#修改tomcat的端口
server.port=8080
#数据库连接配置
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/bookdb?serverTimezone=Asia/Shanghai
spring.datasource.username=root
spring.datasource.password=root
#指定mybatis中配置的映射文件的地址
mybatis.mapper-locations=classpath:/mapper/*.xml
##日志配置
logging.level.com.etc.ssm.dao=DEBUG
logging.pattern.console=%d{yyyy/MM/dd-HH:mm:ss} [%thread] %-5level %logger- %msg%n
logging.pattern.file=%d{yyyy/MM/dd-HH:mm} [%thread] %-5level %logger- %msg%n

##thymeleaf配置
spring.thymeleaf.cache=false
spring.thymeleaf.suffix=.html
spring.thymeleaf.prefix=classpath:/templates/
spring.thymeleaf.encoding=utf-8

（3）将html文件放在\src\main\resources\templates目录中，在html页面中引入thymeleaf命名空间，即此时在html模板文件中动态的属性使用th:命名空间修饰。

<html lang="en" xmlns:th="http://www.thymeleaf.org">

（4）使用thymeleaf语法渲染数据。

index.xml

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <table border="1" cellspacing="0" cellpadding="10">
        <tr>
            <th>用户编号</th>
            <th>用户名称</th>
            <th>用户电话</th>
            <th>用户年龄</th>
        </tr>
        <tr th:each="user : ${userlist}">
            <td th:text="${user.userid}"></td>
            <td th:text="${user.username}"></td>
            <td th:text="${user.userphone}"></td>
            <td th:text="${user.userage}"></td>
        </tr>
    </table>
</body>

UserController.java

package com.etc.ssm.controller;

import com.etc.ssm.entity.User;
import com.etc.ssm.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;

import java.util.List;

@Controller
public class UserController {
    
    
    @Autowired
    UserService userService;

    @GetMapping("api/user/all")
    public String getUserAll(Model model){
    
    
        List<User> userlist = userService.getUserAll();
        model.addAttribute("userlist",userlist);
        return "index";
    }
}

在这里插入图片描述

六、端口被占用的解决方法

使用cmd进入DOS命名窗口，使用命令查看占用端口的进程号，通过进程号关闭该进程，释放端口。

查看占用端口的进程号：netstat -ano | findstr 8080

关闭进程：taskkill /pid 4908 -t -f

在这里插入图片描述

Java学习笔记-Day82 Spring Boot框架（二）

Java学习笔记-Day82 Spring Boot框架（二）

一、Spring Boot的注解

二、自定义banner

三、Spring Boot整合SSM框架集

四、@Mapper和@Repository在Dao层的应用

五、Thymeleaf模板引擎

六、端口被占用的解决方法

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