个人java学习路线-SSM整合

业界资讯 2023-06-19 10:49:10 阅读次数: 0

个人java学习路线-SSM整合

一、SSM整合：

做项目步骤：

  • 需求分析
  • 设计数据库
  • 业务
  • 前端界面

整合步骤：

  • 1.mybatis

java:

dao:BookMapper  BookMapper.xml
pojo:Book
service:BookService BookServiceImpl

resource:

applicationContext.xml 空的
database.properties
mybatis-config.xml
  • 2.spring

java:

空

resource:

applicationContext.xml 
spring-dao.xml
spring-service.xml
  • 3.springmvc

除了上面的12

顺序:
web.xml
spring-mvc.xml

  • 4.写业务

      controller：BookController
  resources:spring-mvc.xml(applicationContext.xml中记得import)

二、实例

这里用ssm来实现一个简单的书籍增删改查

1.依赖及静态资源导出配置(pom.xml)

   <!--依赖：junit，数据库驱动，连接池，servlet，jsp，mybatis，mybatis-spring，spting-->
    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
        </dependency>
        <!--数据库连接池：c3p0-->
        <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.5.2</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.5</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.2</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.2</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.6</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.3.9</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.1.9.RELEASE</version>
        </dependency>
        <!--事务包-->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.9.6</version>
        </dependency>
    </dependencies>

    <!--静态资源导出问题-->
    <build>
        <resources>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
            </resource>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>true</filtering>
            </resource>
        </resources>
    </build>

2.前端页面(已完成的)

欢迎页面：

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
  <head>
    <title>首页</title>
    <style>
      a{
      
      
        text-decoration: none;
        color: black;
        font-size: 18px;
      }
      h3{
      
      
        width: 180px;
        height: 38px;
        margin: 100px auto;
        text-align: center;
        line-height: 38px;
        background: deepskyblue;
        border-radius: 5px;
      }
    </style>
  </head>
  <body>
  <h3>
    <a href="${pageContext.request.contextPath}/book/allBook">进入书籍展示页面</a>
  </h3>
  </body>
</html>

所有书籍展示(在WEB-INF/jsp/下):

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%--
  Created by IntelliJ IDEA.
  User: Lenovo
  Date: 2021/9/23
  Time: 20:24
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>书籍展示页面</title>
    <%--BootStarp美化界面--%>
    <!-- 新 Bootstrap 核心 CSS 文件 -->
    <link href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
<%--    <!-- jQuery文件。务必在bootstrap.min.js 之前引入 -->
    <script src="https://cdn.staticfile.org/jquery/2.1.1/jquery.min.js"></script>
    <!-- 最新的 Bootstrap 核心 JavaScript 文件 -->
    <script src="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script>--%>
</head>
<body>
<div class="container">
    <div class="row clearfix">
        <div class="col-md-12 column">
            <div class="page-header">
                <h1>
                    <small>书籍列表——显示所有书籍</small>
                </h1>
            </div>
        </div>

        <div class="row">
            <div class="col-md-4 column">
                <%--toAddBook--%>
                <a class="btn btn-primary" href="${pageContext.request.contextPath}/book/toAddBook">新增书籍</a>
                <a class="btn btn-primary" href="${pageContext.request.contextPath}/book/allBook">显示全部书籍</a>
            </div>
            <%--调位置的--%>
            <div class="col-md-4 column"></div>
            <%--查询书籍--%>
            <div class="col-md-4 column">
                <%--toAddBook--%>
                <form action="${pageContext.request.contextPath}/book/queryBook" method="post" style="float: right" class="form-inline"><%--让下面两个input同一行显示--%>
                    <span style="color: red;font-weight: bold">${error}</span>
                    <input type="text" name="queryBookName" class="form-control" placeholder="请输入要查询的书籍名称">
                    <input type="submit" value="查询" class="btn btn-primary">
                </form>
            </div>
        </div>
    </div>

    <div class="row clearfix">
        <div class="col-md-12 column">
            <table class="table table-hover table-striped">
                <thead>
                    <tr>
                        <th>书籍编号</th>
                        <th>书籍名称</th>
                        <th>书籍数量</th>
                        <th>书籍详情</th>
                        <th>操作</th>
                    </tr>
                </thead>
                <%--书籍是从数据库中查询出来的，从list中遍历出来--%>
                <tbody>
                    <c:forEach var="book" items="${list}">
                        <tr>
                            <td>${book.bookID}</td>
                            <td>${book.bookName}</td>
                            <td>${book.bookCounts}</td>
                            <td>${book.detail}</td>
                            <td>
                                <a href="${pageContext.request.contextPath}/book/toUpdate?id=${book.bookID}">修改</a>
                                &nbsp; | &nbsp;
                                <a href="${pageContext.request.contextPath}/book/deleteBook/${book.bookID}">删除</a>
                            </td>
                        </tr>
                    </c:forEach>
                </tbody>
            </table>
        </div>
    </div>
</div>

</body>
</html>

添加书(在WEB-INF/jsp/下):

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>添加书籍</title>
    <%--BootStarp美化界面--%>
    <link href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">

</head>
<body>
<div class="container">
    <div class="row clearfix">
        <div class="col-md-12 column">
            <div class="page-header">
                <h1>
                    <small>新增书籍</small>
                </h1>
            </div>
        </div>
    </div>
    <form action="${pageContext.request.contextPath}/book/addBook" method="post">
        <div class="form-group">
            <label >书籍名称</label>
            <input name="bookName" type="text" class="form-control" required>
        </div>
        <div class="form-group">
            <label >书籍数量</label>
            <input name="bookCounts" type="text" class="form-control" required>
        </div>
        <div class="form-group">
            <label >书籍描述</label>
            <input name="detail" type="text" class="form-control" required>
        </div>
        <div class="form-group">
            <input type="submit" class="form-control" value="添加">
        </div>
    </form>
</div>
</body>
</html>

修改书(在WEB-INF/jsp/下):

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>修改书籍</title>
    <%--BootStarp美化界面--%>
    <link href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">

</head>
<body>
<div class="container">
    <div class="row clearfix">
        <div class="col-md-12 column">
            <div class="page-header">
                <h1>
                    <small>修改书籍</small>
                </h1>
            </div>
        </div>
    </div>
    <form action="${pageContext.request.contextPath}/book/updateBook" method="post">
        <input type="hidden" name="bookID" value="${book.bookID}">
        <div class="form-group">
            <label >书籍名称</label>
            <input name="bookName" type="text" class="form-control" value="${book.bookName}" required>
        </div>
        <div class="form-group">
            <label >书籍数量</label>
            <input name="bookCounts" type="text" class="form-control" value="${book.bookCounts}" required>
        </div>
        <div class="form-group">
            <label >书籍描述</label>
            <input name="detail" type="text" class="form-control" value="${book.detail}" required>
        </div>
        <div class="form-group">
            <input type="submit" class="form-control" value="修改">
        </div>
    </form>
</div>
</body>
</html>

3.mybatis

实体类书籍book:

public class Book {
    
    
    private Integer bookID;
    private String bookName;
    private Integer bookCounts;
    private String detail;
    //此处省略get,set等
}

BookMapper(BookDao)接口

public interface BookMapper {
    
    
    //增加一本书
    int addBook(Book book);
    //删除一本书
    int deleteBookById(@Param("bookID") int id);
    //修改一本书
    int updateBook(Book book);
    //查询一本书
    Book queryBookById(int id);
    //增加所有书
    List<Book> queryAllBook();

    //查询书通过bookName
    List<Book> queryBookByName(@Param("bookName") String bookName);
}

BookMapper.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.person.dao.BookMapper">
    
    <insert id="addBook" parameterType="Book">
        insert into books (bookName,bookCounts,detail)
        values (#{bookName},#{bookCounts},#{detail});
    </insert>
    
    <delete id="deleteBookById" parameterType="int">
        delete from books where bookID=#{bookID};
    </delete>
    
    <update id="updateBook" parameterType="Book">
        update books
        set bookName=#{bookName},bookCounts=#{bookCounts},detail=#{detail}
        where bookID=#{bookID};
    </update>
    
    <select id="queryBookById" resultType="Book">
        select * from books where bookID=#{bookID};
    </select>

    <select id="queryAllBook" resultType="Book">
         select * from books;
    </select>

    <select id="queryBookByName" resultType="Book">
        select * from books where bookName like concat('%', #{bookName}, '%');
    </select>
</mapper>

BookService接口:

public interface BookService {
    
    
    //增加一本书
    int addBook(Book book);
    //删除一本书
    int deleteBookById(int id);
    //修改一本书
    int updateBook(Book book);
    //查询一本书
    Book queryBookById(int id);
    //增加所有书
    List<Book> queryAllBook();

    //查询书通过bookName
    List<Book> queryBookByName(String bookName);
}

BookServiceImpl:

public class BookServiceImpl implements BookService{
    
    
    private BookMapper bookMapper;
    public void setBookMapper(BookMapper bookMapper) {
    
    
        this.bookMapper = bookMapper;
    }

    public int addBook(Book book) {
    
    
        return bookMapper.addBook(book);
    }

    public int deleteBookById(int id) {
    
    
        return bookMapper.deleteBookById(id);
    }

    public int updateBook(Book book) {
    
    
        return bookMapper.updateBook(book);
    }

    public Book queryBookById(int id) {
    
    
        return bookMapper.queryBookById(id);
    }

    public List<Book> queryAllBook() {
    
    
        return bookMapper.queryAllBook();
    }

    public List<Book> queryBookByName(String bookName) {
    
    
        return bookMapper.queryBookByName(bookName);
    }
}

database.properties

jdbc.driver=com.mysql.jdbc.Driver
#如果用mysql8.0以上要加时区配置
jdbc.url=jdbc:mysql://localhost:3306/ssmbuild?useSSl=false&useUnicode=true&characterEncoding=utf8
jdbc.username=root
jdbc.password=888666

mybatis-config.xml:

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>

    <settings>
        <setting name="logImpl" value="STDOUT_LOGGING"/>
    </settings>

    <!--配置数据源，交给Spring去做-->
    <typeAliases>
        <package name="com.person.pojo"/>
    </typeAliases>

    <mappers>
        <mapper class="com.person.dao.BookMapper"/>
    </mappers>
</configuration>

applicationContext.xml:暂空

4.spring

spring-dao.xml(主要是整合mybatis部分)：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
                           http://www.springframework.org/schema/beans/spring-beans.xsd
                           http://www.springframework.org/schema/context
                           https://www.springframework.org/schema/context/spring-context.xsd">
    <!--1.关联数据库文件-->
    <context:property-placeholder location="classpath:database.properties"/>

    <!--
        2.连接池
        dbcp:   半自动化操作，不能自动连接
        druid:  自动化操作（自动化的加载配置文件，并且可以自动设置到对象中）
        c3p0:   以后在讲
        hikari:
    -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${jdbc.driver}"/>
        <property name="jdbcUrl" value="${jdbc.url}"/>
        <property name="user" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
        
        <!--c3p0连接池的私有属性-->
        <property name="maxPoolSize" value="30"/>
        <property name="minPoolSize" value="10"/>
        <!--关闭连接后不自动提交commit-->
        <property name="autoCommitOnClose" value="false"/>
        <!--获取连接超时时间-->
        <property name="checkoutTimeout" value="10000"/>
        <!--当获取连接失败重试次数-->
        <property name="acquireRetryAttempts" value="2"/>
    </bean>

    <!--3.sqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <!--绑定mybatis的配置文件-->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
    </bean>

    <!--配置dao接口的扫描包，动态实现了接口可以注入到Spring容器中-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!--注入sqlSessionFactory-->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
        <!--扫描dao接口-->
        <property name="basePackage" value="com.person.dao"/>
    </bean>
</beans>

spring-service.xml(主要是事务相关)：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
                           http://www.springframework.org/schema/beans/spring-beans.xsd
                           http://www.springframework.org/schema/context
                           https://www.springframework.org/schema/context/spring-context.xsd
                           http://www.springframework.org/schema/aop
                           https://www.springframework.org/schema/aop/spring-aop.xsd
                           http://www.springframework.org/schema/tx
                           http://www.springframework.org/schema/tx/spring-tx.xsd">

    <!--1.扫描service下的包-->
    <context:component-scan base-package="com.person.service"/>

    <!--2.将我们所有的业务类，注入到Spring，可以通过配置，或者注解实现-->
    <bean id="BookServiceImpl" class="com.person.service.BookServiceImpl">
        <property name="bookMapper" ref="bookMapper"/>
    </bean>

    <!--3.声明式事务配置-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <!--注入数据源-->
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <!--4.aop事务支持-->
    <!--结合AOP实现事务的织入-->
    <!--配置事务通知：-->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <!--给那些方法配置事务-->
        <!--配置事务的传播特性：new propagation=-->
        <tx:attributes>
            <tx:method name="*" propagation="REQUIRED"/>
        </tx:attributes>
    </tx:advice>
    
    <!--配置事务的切入-->
    <aop:config>
        <aop:pointcut id="txPointCut" expression="execution(* com.person.dao.*.*(..))"/>
        <aop:advisor advice-ref="txAdvice" pointcut-ref="txPointCut"/>
    </aop:config>
</beans>

applicationContext.xml(这里把上面两个整合)

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <import resource="classpath:spring-dao.xml"/>
    <import resource="classpath:spring-service.xml"/>
</beans>

5.springmvc

spring-mvc.xml(此时controller还是空的文件):

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
                           http://www.springframework.org/schema/beans/spring-beans.xsd
                           http://www.springframework.org/schema/mvc
                           https://www.springframework.org/schema/mvc/spring-mvc.xsd
                           http://www.springframework.org/schema/context
                           https://www.springframework.org/schema/context/spring-context.xsd">

    <!--1.注解驱动-->
    <mvc:annotation-driven/>
    <!--2.静态资源过滤-->
    <mvc:default-servlet-handler/>
    <!--3.扫描包：controller -->
    <context:component-scan base-package="com.person.controller"/>
    <!--4.视图解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
</beans>

顺便把这个放到applicationContext.xml中:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <import resource="classpath:spring-dao.xml"/>
    <import resource="classpath:spring-service.xml"/>
    <import resource="classpath:spring-mvc.xml"/>
</beans>

web.xml:

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">

    <!--DispatchServlet-->
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:applicationContext.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <!--乱码过滤-->
    <filter>
        <filter-name>encodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>utf-8</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>encodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <!--Session-->
    <session-config>
        <session-timeout>15</session-timeout>
    </session-config>
</web-app>

6.写业务

controller：

@Controller
@RequestMapping("/book")
public class BookController {
    
    
    //controller调service层
    @Autowired
    @Qualifier("BookServiceImpl")
    private BookService bookService;

    //查询全部的书籍，并且返回到一个书籍展示页面
    @RequestMapping("/allBook")
    public String list(Model model){
    
    
        List<Book> list=bookService.queryAllBook();
        model.addAttribute("list",list);
        return "allBook";
    }

    //跳转到增加书籍页面
    @RequestMapping("/toAddBook")
    public String toAddPaper(){
    
    

        return "addBook";
    }

    //添加书籍的请求
    @RequestMapping("/addBook")
    public String addBook(Book book){
    
    
        System.out.println("addBook=>"+book);
        bookService.addBook(book);
        return "redirect:/book/allBook";//重定向到@RequestMapping("/allBook")请求
    }

    //跳转到修改页面
    @RequestMapping("/toUpdate")
    public String toUpdatePager(int id,Model model){
    
    
        Book book = bookService.queryBookById(id);
        model.addAttribute("book",book);
        return "updateBook";
    }

    //修改书籍
    @RequestMapping("/updateBook")
    public String updateBook(Book book){
    
    
        System.out.println("updateBook=>"+book);
        bookService.updateBook(book);
        return "redirect:/book/allBook";
    }

    //删除数据
    @RequestMapping("/deleteBook/{bookID}")
    public String deleteBook(@PathVariable("bookID") int id){
    
    
        bookService.deleteBookById(id);
        return "redirect:/book/allBook";
    }

    //通过bookName查询书籍
    @RequestMapping("/queryBook")
    public String queryBook(String queryBookName, Model model){
    
    
        List<Book> bookList = bookService.queryBookByName(queryBookName);
        if (bookList.size()==0){
    
    
            model.addAttribute("error","未查到");
        }
        model.addAttribute("list",bookList);
        return "allBook";
    }
}

到此简单的运用ssm对书籍进行增删改查就完成了

三、错误排查

bean不存在

步骤：

1.查看这个bean注入是否成功！  
2.Junit单元测试，看我们的代码是否能够查询出来结果！ 
3.问题，一定不在我们的底层，spring出现问题
4.SpringMVC，整合的时候没调用到我们的service层的bean；
    4.1.applicationContext没有注入bean
    4.2.web.xml绑定过配置文件！但我们配置的式Spring-mvc.xml
    Spring-mvc.xml中没有service 的bean，所以报错

四、额外

mybatis中like语句的写法

不能直接写

like '%#{bookName}%';
//会报错

要写

like concat('%', #{bookName}, '%');

这只是一种解决办法

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转载自blog.csdn.net/youxizaixian123/article/details/121064071
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