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25. SSM 框架整合

2022-02-05 分类：未分类 阅读(275)

SSM 框架整合

1、实际开发中通常不会采用 SSM 框架整合的方式；

2、学习 SSM 是为了弄懂框架整合的底层原理；

Web 框架技术的迭代：

第一代：SSH(Spring/Struts/Hibernate) → 第二代：SSM(Spring/SpringMVC/MyBatis) → 第三代：Spring Boot

在这里插入图片描述

  1. Spring MVC 框架负责客户端到服务器程序的交互，接收客户端请求并响应；

  2. MyBatis 负责 Web 应用程序与数据库的交互，完成数据模型的 CRUD；

  3. Spring 负责管理 SpringMVC 和 MyBatis 相关对象的创建、依赖注入和维护；

SSM 框架整合具体步骤如下：

第一步：创建 Maven 工程，导入 spring/springmvc/mybatis 相关的依赖 jar 包；

<dependencies>
    <!-- SpringMVC -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>5.0.11.RELEASE</version>
    </dependency>
    <!-- Spring JDBC -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>5.0.11.RELEASE</version>
    </dependency>
    <!-- Spring AOP -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-aop</artifactId>
        <version>5.0.11.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-aspects</artifactId>
        <version>5.0.11.RELEASE</version>
    </dependency>
    <!-- MyBatis -->
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>3.4.5</version>
    </dependency>
    <!-- MyBatis整合Spring -->
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis-spring</artifactId>
        <version>1.3.1</version>
    </dependency>
    <!-- MySQL驱动 -->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>8.0.11</version>
    </dependency>
    <!-- C3P0 -->
    <dependency>
        <groupId>c3p0</groupId>
        <artifactId>c3p0</artifactId>
        <version>0.9.1.2</version>
    </dependency>
    <!-- JSTL -->
    <dependency>
        <groupId>jstl</groupId>
        <artifactId>jstl</artifactId>
        <version>1.2</version>
    </dependency>
    <!-- ServletAPI -->
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
        <version>3.1.0</version>
    </dependency>

    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <version>1.18.6</version>
        <scope>provided</scope>
    </dependency>
</dependencies>

<build>
	<resources>
        <resource>
            <directory>src/main/java</directory>
            <includes>
                <include>**/*.xml</include>
            </includes>
        </resource>
    </resources>
</build>

2、在 web.xml 中配置 SpringMVC、Spring、字符编码过滤器、加载静态资源等；

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4"
         xmlns="http://java.sun.com/xml/ns/j2ee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
  <display-name>Archetype Created Web Application</display-name>
  <!--启动Spring-->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:spring.xml</param-value>
  </context-param>
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  
  <!--Spring MVC-->
  <servlet>
    <servlet-name>dispatcherServlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:springmvc.xml</param-value>
    </init-param>
  </servlet>
  
  <servlet-mapping>
    <servlet-name>dispatcherServlet</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>
  
  <!-- 字符过滤编码器 -->
  <filter>
    <filter-name>characterEncodingFilter</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>characterEncodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
  
  <!--加载静态资源-->
  <servlet-mapping>
    <servlet-name>default</servlet-name>
    <url-pattern>*.js</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>default</servlet-name>
    <url-pattern>*.jpg</url-pattern>
  </servlet-mapping>

</web-app>

3、创建 spring.xml、springmvc.xml、mybatis.xml 配置文件；

3.1 在 spring.xml 文件中配置 MyBatis 和 Spring 的整合

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:p="http://www.springframework.org/schema/p"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context-4.3.xsd
">
    <!--整合MyBatis-->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="user" value="root"></property>
        <property name="password" value="123456"></property>
        <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/test?useUnicode=true&amp;characterEncoding=UTF-8"></property>
        <property name="driverClass" value="com.mysql.cj.jdbc.Driver"></property>
        <property name="initialPoolSize" value="20"></property>
        <property name="maxPoolSize" value="50"></property>
    </bean>

    <!--配置MyBatis SqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"></property>
        <property name="mapperLocations" value="classpath:com/trainingl/repository/*.xml"></property>
        <property name="configLocation" value="classpath:mybatis.xml"></property>
    </bean>

    <!--扫描自定义的Mapper接口-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.trainingl.repository"></property>
    </bean>
</beans>

3.2 在 mybatis.xml 中配置一些 MyBatis 的辅助信息，比如：打印SQL语句等

<?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>
    <!--打印SQL-->
    <settings>
        <setting name="logImpl" value="STDOUT_LOGGING"/>
    </settings>
</configuration>

3.3 配置 springmvc.xml

<?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:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context-3.0.xsd
       http://www.springframework.org/schema/mvc
       http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd">
    <!--启动注解驱动-->
    <mvc:annotation-driven></mvc:annotation-driven>
    <!--扫描业务代码-->
    <context:component-scan base-package="com.trainingl"></context:component-scan>
    <!--配置视图解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>
</beans>

4、创建实体类 User

package com.trainingl.entity;

import lombok.Data;

@Data
public class User {
    private long id;
    private String username;
    private String password;
    private Double score;
}

5、数据持久层接口 UserRepository

package com.trainingl.repository;

import com.trainingl.entity.User;

import java.util.List;

public interface UserRepository {
    public List<User> findAll();
}

6、UserRepository.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.trainingl.repository.UserRepository">

    <select id="findAll" resultType="com.trainingl.entity.User">
        select * from User
    </select>
</mapper>

7、服务层接口 UserService

package com.trainingl.service;

import com.trainingl.entity.User;

import java.util.List;

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

8、服务层实现 UserServiceImpl

package com.trainingl.service.Impl;

import com.trainingl.entity.User;
import com.trainingl.repository.UserRepository;
import com.trainingl.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
    private UserRepository userRepository;

    public List<User> findAll(){
        return userRepository.findAll();
    }
}

9、控制层 UserHandler

package com.trainingl.controller;

import com.trainingl.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

@Controller
@RequestMapping("/user")
public class UserHandler {
    @Autowired
    private UserService userService;

    @GetMapping("/list")
    public ModelAndView findAll(){
        ModelAndView modelAndView = new ModelAndView();
        modelAndView.setViewName("index");
        modelAndView.addObject("userList",userService.findAll());
        return modelAndView;
    }
}

10、JSP 视图层

<%--
  Created by IntelliJ IDEA.
  User: 17209
  Date: 2021-09-18
  Time: 11:19
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ page isELIgnored="false" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
    <title>用户信息</title>
</head>
<body>
    <table>
        <tr>
            <th>编号</th>
            <th>用户名</th>
            <th>密码</th>
            <th>分数</th>
        </tr>
        <c:forEach items="${userList}" var="user">
            <tr>
                <td>${user.id}</td>
                <td>${user.username}</td>
                <td>${user.password}</td>
                <td>${user.score}</td>
            </tr>
        </c:forEach>
    </table>
</body>
</html>

程序的运行结果如下：

在这里插入图片描述
至此，本专栏介绍完了SSM框架的基本语法和使用技巧。

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