1.SSM简介
SSM(Spring+SpringMVC+MyBatis)框架集由Spring、MyBatis两个开源框架整合而成(SpringMVC是Spring中的部分内容)。常作为数据源较简单的web项目的框架。
2.工具及版本
2.1 JDK1.8
2.2 Intelli j IDEA 2019.2.4
2.3 Maven 3.6.2
2.4 Tomcat 9.0
2.5 windows 10系统
2.6 MySQL 8.0.15
注意:MySQL须有已创建的数据库,例如:(本例mydatabase数据库与book数据表)
3.开始搭建
3.1 创建项目
接下来,需要引入一些其他的依赖:
参考pom.xml文件内容如下:
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.ssm</groupId>
<artifactId>demo</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>
<name>demo Maven Webapp</name>
<!-- FIXME change it to the project's website -->
<url>http://www.example.com</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.7</maven.compiler.source>
<maven.compiler.target>1.7</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<!-- spring web jar包 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>5.1.0.RELEASE</version>
</dependency>
<!-- spring aop jar包 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>5.1.0.RELEASE</version>
</dependency>
<!-- spring 驱动jar包-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.1.0.RELEASE</version>
</dependency>
<!-- spring mvc 依赖包 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.1.0.RELEASE</version>
</dependency>
<!--mybatis jar包 -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.6</version>
</dependency>
<!-- mybatis spring-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.3.2</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.15</version>
</dependency>
<!-- jstl依赖 -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.28</version>
</dependency>
</dependencies>
<build>
<finalName>demo</finalName>
<pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
<plugins>
<plugin>
<artifactId>maven-clean-plugin</artifactId>
<version>3.1.0</version>
</plugin>
<!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
<plugin>
<artifactId>maven-resources-plugin</artifactId>
<version>3.0.2</version>
</plugin>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.0</version>
</plugin>
<plugin>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.22.1</version>
</plugin>
<plugin>
<artifactId>maven-war-plugin</artifactId>
<version>3.2.2</version>
</plugin>
<plugin>
<artifactId>maven-install-plugin</artifactId>
<version>2.5.2</version>
</plugin>
<plugin>
<artifactId>maven-deploy-plugin</artifactId>
<version>2.8.2</version>
</plugin>
</plugins>
</pluginManagement>
</build>
</project>
导入新加入的依赖:
接下来完善工程目录结构:
以相同的方式在main目录下创建另一个目录resources:
接下来分别将java目录和resources目录标记为Source Root和Resource Root:
完成效果如下:
继续完善目录:
完成java目录下的编码以及resources目录下的配置:
以下是每个文件的参考内容:
- Book类
import java.io.Serializable;
public class Book implements Serializable {
//书籍编号
private Long bno;
//书籍名称
private String bname;
//书籍价格
private Double price;
public Long getBno() {
return bno;
}
public void setBno(Long bno) {
this.bno = bno;
}
public String getBname() {
return bname;
}
public void setBname(String bname) {
this.bname = bname;
}
public Double getPrice() {
return price;
}
public void setPrice(Double price) {
this.price = price;
}
}
- BookDao 接口
import com.ssm.demo.entity.Book;
import org.springframework.stereotype.Repository;
import java.util.List;
@Repository
public interface BookDao {
//声明一个查询出所有书籍信息的方法
List<Book> selectAllBook();
}
- BookService接口
import com.ssm.demo.entity.Book;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public interface BookService {
//声明一个展示所有书籍的方法
List<Book> showBooks();
}
- BookServiceImpl实现类
import com.ssm.demo.dao.BookDao;
import com.ssm.demo.entity.Book;
import com.ssm.demo.service.BookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class BookServiceImpl implements BookService {
/*
*注入一个BookDao对象,
* 利用bookDao提供的selectAllBook()方法来实现Service中展示所有书籍的功能方法
*/
@Autowired
private BookDao bookDao;
@Override
public List<Book> showBooks(){
return bookDao.selectAllBook();
}
}
5.BookController类
import com.ssm.demo.entity.Book;
import com.ssm.demo.service.BookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.List;
@RestController
@RequestMapping("/")
public class BookController {
@Autowired
private BookService bookService;
@RequestMapping("/queryAllBooks")
public List<Book> queryAllBooks(){
return bookService.showBooks();
}
}
6.BookMapper.xml配置文件
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.ssm.demo.dao.BookDao">
<select id="selectAllBook" resultType="com.ssm.demo.entity.Book">
select * from book;
</select>
</mapper>
- spring_boot.xml配置文件
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:contxt="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 http://www.springframework.org/schema/context/spring-context.xsd">
<!-- 扫描 service 包下面使用@Component/@Service/@Repository/@Controller 注解的类 将其实例化,放入容器中 -->
<contxt:component-scan base-package="com.ssm.demo" />
<!--创建数据源-->
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<!-- 数据库驱动 -->
<property name="driverClassName" value="com.mysql.cj.jdbc.Driver" />
<!-- 数据库连接 -->
<property name="url" value="jdbc:mysql://localhost:3306/mydatabase" />
<!-- 数据库用户名 -->
<property name="username" value="root"/>
<!-- 数据库密码 -->
<property name="password" value="2557876426"/>
</bean>
<!-- 配置mybatis -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<!-- 数据源的实例化 -->
<property name="dataSource" ref="dataSource"/>
<!-- 映射 DML 语法 -->
<property name="mapperLocations" value="classpath:mapper/*.xml"/>
</bean>
<!-- 映射 数据访问层 ( dao ) 中的接口 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
<property name="basePackage" value="com.ssm.demo.dao"/>
</bean>
</beans>
- spring_web.xml
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:contxt="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">
<!-- 扫描 控制层 (web) 下面 @Controller 注解的类 将其实例化,放入容器中 -->
<contxt:component-scan base-package="com.ssm.demo"/>
<!-- 启动 mvc 的常用注解 -->
<mvc:annotation-driven>
<mvc:message-converters register-defaults="false">
<bean class="org.springframework.http.converter.StringHttpMessageConverter"/>
<bean class="org.springframework.http.converter.ByteArrayHttpMessageConverter"/>
<bean class="org.springframework.http.converter.BufferedImageHttpMessageConverter"/>
<!-- 配置Fastjson支持 -->
<bean id="fastJsonHttpMessageConverter" class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter">
<property name="supportedMediaTypes">
<list>
<value>text/html;charset=UTF-8</value>
<value>application/json;charset=UTF-8</value>
</list>
</property>
</bean>
</mvc:message-converters>
</mvc:annotation-driven>
<!--将所有的静态资源,交给 Servlet 处理-->
<mvc:default-servlet-handler/>
<!--配置 view 解析器-->
<!-- 页面接受数据 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />
<property name="prefix" value="/WEB-INF/" />
<property name="suffix" value=".jsp" />
</bean>
</beans>
- web.xml配置文件
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<display-name>Archetype Created Web Application</display-name>
<!--配置 Spring 容器-->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring_root.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!--配置 Spring mvc 容器-->
<!--将所有请求,都交给Spring MVC 处理-->
<servlet>
<servlet-name>webs</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring_web.xml</param-value>
</init-param>
</servlet>
<!--将 请求 截取 转交给 webs -->
<servlet-mapping>
<servlet-name>webs</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
到此所有文件配置完成,接下来就可以运行程序了:
运行成功会跳出页面:
显示Hello World是因为:
接下来运行已经写好的数据库查询:
访问运行的结果如下:
查询成功!