• SSM框架搭建


    SSM整合

    SSM是Spring + SpringMVC + Mybatis。虽然SpringBoot很火,但这一套SSM依然有很多公司是在使用的。下面我们来看看如何完整的配置一套SSM框架。

    整合目标:

    • 数据库连接池以及事务管理都交给Spring容器来完成
    • SqlSessionFactory对象应该放到Spring容器中作为单例对象管理
    • Mapper动态代理对象交给Spring管理,我们从Spring容器中直接获得Mapper的代理对象

    整合需要的jar包:

    • Junit测试jar(4.12版本)
    • Mybatis的jar(3.4.5)
    • Spring相关jar(spring-context、spring-test、spring-jdbc、spring-tx、spring-aop、
      aspectjweaver)
    • Mybatis/Spring整合包jar(mybatis-spring-xx.jar)
    • Mysql数据库驱动jar
    • Druid数据库连接池的jar
    1. 引入相关依赖
    <dependencies>
            <!--junit-->
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>4.12</version>
                <scope>test</scope>
            </dependency>
            <!--mybatis-->
            <dependency>
                <groupId>org.mybatis</groupId>
                <artifactId>mybatis</artifactId>
                <version>3.4.5</version>
            </dependency>
            <!--spring相关-->
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-context</artifactId>
                <version>5.1.12.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-test</artifactId>
                <version>5.1.12.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-jdbc</artifactId>
                <version>5.1.12.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-tx</artifactId>
                <version>5.1.12.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-aop</artifactId>
                <version>5.1.12.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>org.aspectj</groupId>
                <artifactId>aspectjweaver</artifactId>
                <version>1.8.9</version>
            </dependency>
            <!--mybatis与spring的整合包-->
            <dependency>
                <groupId>org.mybatis</groupId>
                <artifactId>mybatis-spring</artifactId>
                <version>2.0.3</version>
            </dependency>
            <!--数据库驱动jar-->
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>8.0.13</version>
            </dependency>
            <!--druid连接池-->
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>druid</artifactId>
                <version>1.1.21</version>
            </dependency>
        </dependencies>
    
    1. Spring配置文件-dao层相关
    <?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
           xmlns:context="http://www.springframework.org/schema/context"
           xmlns:tx="http://www.springframework.org/schema/tx"
           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/context
    http://www.springframework.org/schema/context/spring-context.xsd
    http://www.springframework.org/schema/tx
    http://www.springframework.org/schema/tx/spring-tx.xsd
    ">
        <!--包扫描-->
        <context:component-scan base-package="com.mmc.ssm.mapper"/>
        <!--数据库连接池以及事务管理都交给Spring容器来完成-->
        <!--引⼊外部资源⽂件-->
        <context:property-placeholder
                location="classpath:jdbc.properties"/>
        <!--第三⽅jar中的bean定义在xml中-->
        <bean id="dataSource"
              class="com.alibaba.druid.pool.DruidDataSource">
            <property name="driverClassName" value="${jdbc.driver}"/>
            <property name="url" value="${jdbc.url}"/>
            <property name="username" value="${jdbc.username}"/>
            <property name="password" value="${jdbc.password}"/>
        </bean>
        <!--SqlSessionFactory对象应该放到Spring容器中作为单例对象管理
        原来mybaits中sqlSessionFactory的构建是需要素材的:SqlMapConfig.xml中的内
        容
        -->
        <bean id="sqlSessionFactory"
              class="org.mybatis.spring.SqlSessionFactoryBean">
            <!--别名映射扫描-->
            <property name="typeAliasesPackage" value="com.mmc.ssm.bean"/>
            <!--数据源dataSource-->
            <property name="dataSource" ref="dataSource"/>
            <property name="mapperLocations" value="classpath:mapper/*"></property>
        </bean>
        <!--Mapper动态代理对象交给Spring管理,我们从Spring容器中直接获得Mapper的代理对
        象-->
        <!--扫描mapper接⼝,⽣成代理对象,⽣成的代理对象会存储在ioc容器中-->
        <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
            <!--mapper接⼝包路径配置-->
            <property name="basePackage" value="com.mmc.ssm.mapper"/>
            <property name="sqlSessionFactoryBeanName"
                      value="sqlSessionFactory"/>
        </bean>
    </beans>
    

    配置文件里还引入了jdbc的一个配置文件jdbc.properties
    内容如下:

    jdbc.driver=com.mysql.jdbc.Driver
    jdbc.url=jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=utf8&autoReconnect=true&allowMultiQueries=true&useSSL=false&serverTimezone=UTC
    jdbc.username=root
    jdbc.password=0490218292
    
    1. Spring配置文件-service层相关
    <?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
           xmlns:context="http://www.springframework.org/schema/context"
           xmlns:tx="http://www.springframework.org/schema/tx"
           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/context
    http://www.springframework.org/schema/context/spring-context.xsd
    http://www.springframework.org/schema/tx
    http://www.springframework.org/schema/tx/spring-tx.xsd
    ">
        <!--包扫描-->
        <context:component-scan base-package="com.mmc.ssm.service.impl"/>
        <!--事务管理-->
        <bean id="transactionManager"
              class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
            <property name="dataSource" ref="dataSource"/>
        </bean>
        <!--事务管理注解驱动-->
        <tx:annotation-driven transaction-manager="transactionManager"/>
    </beans>
    
    1. 编写mapper接口
    public interface UserMapper {
    
        List<User> queryUserList();
    }
    
    1. 编写mapper的xml文件
    <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
            "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
    <mapper namespace="com.mmc.ssm.mapper.UserMapper">
        <select id="queryUserList" resultType="com.mmc.ssm.bean.User">
          select * from user
        </select>
    </mapper>
    
    1. 到这里我们可以先测试一下之前的代码
    @RunWith(SpringJUnit4ClassRunner.class)
    @ContextConfiguration(locations = "classpath*:applicationContext*.xml")
    public class TestSSM {
    
    
        @Autowired
        private UserService userService;
    
        @Test
        public void test(){
            List<User> users = userService.queryUsers();
            System.out.println(users);
        }
    
    }
    

    没有问题了再继续整合SpringMVC
    7. 引入SpringMVC 依赖

     <!--SpringMVC-->
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-webmvc</artifactId>
                <version>5.1.12.RELEASE</version>
            </dependency>
            <!--jsp-api&servlet-api-->
            <dependency>
                <groupId>javax.servlet</groupId>
                <artifactId>jsp-api</artifactId>
                <version>2.0</version>
                <scope>provided</scope>
            </dependency>
            <dependency>
                <groupId>javax.servlet</groupId>
                <artifactId>javax.servlet-api</artifactId>
                <version>3.1.0</version>
                <scope>provided</scope>
            </dependency>
            <!--⻚⾯使⽤jstl表达式-->
            <dependency>
                <groupId>jstl</groupId>
                <artifactId>jstl</artifactId>
                <version>1.2</version>
            </dependency>
            <dependency>
                <groupId>taglibs</groupId>
                <artifactId>standard</artifactId>
                <version>1.1.2</version>
            </dependency>
            <!--json数据交互所需jar,start-->
            <dependency>
                <groupId>com.fasterxml.jackson.core</groupId>
                <artifactId>jackson-core</artifactId>
                <version>2.9.0</version>
            </dependency>
            <dependency>
                <groupId>com.fasterxml.jackson.core</groupId>
                <artifactId>jackson-databind</artifactId>
                <version>2.9.0</version>
            </dependency>
            <dependency>
                <groupId>com.fasterxml.jackson.core</groupId>
                <artifactId>jackson-annotations</artifactId>
                <version>2.9.0</version>
            </dependency>
            <!--json数据交互所需jar,end-->
    
    1. 配置Spring MVC配置文件
    <?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
            https://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">
        <!--扫描controller-->
        <context:component-scan base-package="com.mmc.ssm.controller"/>
        <mvc:annotation-driven/>
    </beans>
    
    1. 编写contrller类
    @Controller
    public class UserController {
    
        @Autowired
        private UserService userService;
    
        @RequestMapping("/listUser")
        @ResponseBody
        public List<User> listUser(){
          return  userService.queryUsers();
        }
    
    }
    
    1. 配置SpringMVC及Spring容器启动
    <!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>
    
        <display-name>Archetype Created Web Application</display-name>'
    
        <context-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:applicationContext*.xml</param-value>
        </context-param>
        <!--spring框架启动-->
        <listener>
            <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
        </listener>
    
    
        <!--springmvc启动-->
        <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:springmvc.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>
    </web-app>
    
    1. 启动项目

    在项目的pom.xml里加入

    war

    再加入maven启动插件:

     <build>
            <plugins>
                <plugin>
                    <groupId>org.apache.tomcat.maven</groupId>
                    <artifactId>tomcat7-maven-plugin</artifactId>
                    <version>2.2</version>
                    <configuration>
                        <port>8080</port>
                        <path>/</path>
                    </configuration>
                </plugin>
            </plugins>
        </build>
    

    就可以点击tomcat7:run启动了。

    项目整体结构如下:

    需要注意:
    Spring容器和SpringMVC容器是有层次的。
    Spring容器里配置了Service和dao对象,SpringMVC容器里有controller对象,它可以引用Spring容器里的对象。但是Spring容器不能引用SpringMVC里的对象。

    SpringMVC里是要配置controller的,如果Spring再配置的话,就是两个容器里都有controller对象,且两个对象是不同的。

    书山有路勤为径,学海无涯苦作舟
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  • 原文地址:https://www.cnblogs.com/javammc/p/15619064.html
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