Java：三大框架整合搭建SSM框架

向右看齐 2021-11-04 18:56 861阅读 0赞

### 1、SSM原理图 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDU4ODQ5NQ_size_16_color_FFFFFF_t_70]

*  首先前端页面发送请求，然后通过前端控制器找到对应的Controller，Controller调用Service的方法，Service调用Dao层的方法，Dao方法对数据库操作，将查询的值返回到Controller进行处理。最后响应页面。
 *  Controller、Service、Dao分别对应springMVC、spring、mybatis框架。这也是MVC三层模型的基本思想。
 *  分别用spring去整合mybatis和springMVC。

### 2、SSM各文件的关系 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDU4ODQ5NQ_size_16_color_FFFFFF_t_70 1]

*  由于这里的配置比较多，所以大家要明确这里的配置文件之间的关系。下面就一个一个来说如何配置。下面的配置可以结合这个图来看。

### 3、各配置文件 ###

#### web.xml文件 ####

<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd" >
    
    <web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0">
        <display-name>Archetype Created Web Application</display-name>
        <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
                    classpath:applicationContext.xml
                </param-value>
            </init-param>
            
            <load-on-startup>1</load-on-startup>
        </servlet>
        <servlet-mapping>
            <servlet-name>dispatcherServlet</servlet-name>
            <url-pattern>/</url-pattern>
        </servlet-mapping>
        
        <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>
            <init-param>
                <param-name>forceEncoding</param-name>
                <param-value>true</param-value>
            </init-param>
        </filter>
        <filter-mapping>
            <filter-name>characterEncodingFilter</filter-name>
            <url-pattern>/*</url-pattern>
        </filter-mapping>
    </web-app>

*  这里的web.xml文件时tomcat启动时，就加载的文件。一切的请求都由前端控制器支配，初始化时，加载springMVC.xml和applicationContext.xml文件。这里还有一个编码的配置器。

#### springMVC.xml文件 ####

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context" 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 http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd ">
        
        <context:component-scan base-package="com.maven.controller"/>
    
        
        <mvc:annotation-driven/>
    
        <bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
            <property name="prefix" value="/WEB-INF/pages/"></property>
            <property name="suffix" value=".jsp"></property>
        </bean>
        <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping" />
        <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"/>
    
        <mvc:default-servlet-handler/>
    </beans>

*  注解扫描需要用base-package指定我们要扫描的包路径，一般指向controller。
 *  开启springMVC框架的注解的支持，是固定写法。
 *  internalResourceViewResolver视图解析器，两个property配置的是文件的路径以及后缀名。
 *  映射处理器和处理器适配器一般直接加上就可以了。
 *  释放静态资源，可以这样写，当然还有另一种写法<mvc:resource…。指定对应的静态资源。html、css、js之类的。

#### applicationContext.xml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:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" 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.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">
    
    
    
        <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
            <property name="driverClass" value="com.mysql.jdbc.Driver" />
            <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/maven?useUnicode=true&characterEncoding=utf8" />
            <property name="user" value="root" />
            <property name="password" value="111111" />
        </bean>
    
        <bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
            <property name="dataSource" ref="dataSource"/>
            
        </bean>
        
        <bean id="mapperScanner" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
            <property name="sqlSessionFactoryBeanName" value="sqlSessionFactoryBean"/>
            <property name="basePackage" value="com.maven.dao"/>
        </bean>
    
    
    
        <context:component-scan base-package="com.maven.service"/>
    
    
        <bean id="dataSourceTransactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
            <property name="dataSource" ref="dataSource"></property>
        </bean>
    
        <tx:advice id="advice" transaction-manager="dataSourceTransactionManager">
            <tx:attributes>
                <tx:method name="save*" propagation="REQUIRED"/>
                <tx:method name="update*" propagation="REQUIRED"/>
                <tx:method name="delete*" propagation="REQUIRED"/>
                <tx:method name="find*" read-only="true"/>
    
    
            </tx:attributes>
        </tx:advice>
    
        <aop:config>
            <aop:pointcut id="pointcut" expression="execution(* com.maven.service.Impl.*.*(..))"/>
            <aop:advisor advice-ref="advice" pointcut-ref="pointcut"/>
        </aop:config>
    
    </beans>

*  数据库的配置信息、配置sqlSession对象的工厂、配置accountDao接口所在的包，这里都可以依据自己的数据库信息修改。
 *  然后是开启spring注解扫描、配置事务管理器、配置事务通知、配置切面。

### 完整项目目录 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDU4ODQ5NQ_size_16_color_FFFFFF_t_70 2]

#### IUserDao接口 ####

*  这里只写了一个方法测试。

package com.maven.dao;
    
    import com.maven.domain.User;
    
    public interface IUserDao { 
        public User findAllById(int id);
    }

*  这里面配置的方法是IUserDao.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.maven.dao.IUserDao">
        <select id="findAllById" parameterType="int" resultType="com.maven.domain.User">
            select * from user where id = #{id};
        </select>
    </mapper>

#### User实体类 ####

package com.maven.domain;
    
    public class User { 
        private int id;
        private String name;
        private int age;
       //省略get和set方法
    }

#### IUserService ####

package com.maven.service;
    
    import com.maven.domain.User;
    import org.springframework.stereotype.Service;
    
    public interface IUserService { 
        public User findAllById(int id);
    }

#### serServiceImpl ####

package com.maven.service.Impl;
    
    import com.maven.dao.IUserDao;
    import com.maven.domain.User;
    import com.maven.service.IUserService;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Service;
    @Service
    public class UserServiceImpl implements IUserService { 
    
        @Autowired
        private IUserDao userDao;
    
        public User findAllById(int id) { 
            return userDao.findAllById(id);
        }
    }

#### UserController ####

package com.maven.controller;
    
    import com.maven.domain.User;
    import com.maven.service.IUserService;
    import com.maven.service.Impl.UserServiceImpl;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Controller;
    import org.springframework.ui.Model;
    import org.springframework.web.bind.annotation.RequestMapping;
    
    import javax.annotation.Resource;
    
    @Controller
    @RequestMapping("/user")
    public class UserController { 
        @Autowired
        private IUserService userService;
        @RequestMapping("/test")
        public String findDetail(Model model) { 
            User user = userService.findAllById(1);
            System.out.println(user);
            model.addAttribute("", user);
            return "success";
        }
    }

#### 测试类，这个大家可以自己写。 ####

#### jsp ####

<%--
      Created by IntelliJ IDEA.
      User: Administrator
      Date: 2019/8/7
      Time: 13:29
      To change this template use File | Settings | File Templates.
    --%>
    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <html>
    <head>
        <title>Title</title>
    </head>
    <body>
    <a href="user/test">点击我</a>
    </body>
    </html>

<%--
      Created by IntelliJ IDEA.
      User: Administrator
      Date: 2019/8/7
      Time: 13:28
      To change this template use File | Settings | File Templates.
    --%>
    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <html>
    <head>
        <title>Title</title>
    </head>
    <body>
    <p>success</p>
    </body>
    </html>

#### 最后 ####

*  小伙伴们有什么问题可以留言。

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