SSM框架整合（Spring+SrpingMVC+Mybatis）简单案例

简介：

　　SSM框架是Spring，SpringMVC 和Mybatis框架的整合，是标准的MVC模式，将整个系统划分为表现层，controller层，service层，dao层四层。

　　Spring实现对业务对象的管理，SpirngMVC负责请求的转发和视图管理，Mybatis作为数据对象的持久化引擎。

为什么要用ssm？

为什么使用mybatis?

1、数据库没有连接池，每次请求都会重新创建。

　　mybatis：使用线程池

2、sql语句是写死在代码中，不利于代码维护。

　　mybatis：在xml中配置

3、preparedStatement 中的设置的参数也是写的死，同样不利于维护。

　　mybatis：在xml中配置

4、数据从数据库获取后，读取方式同样是写死的。

　　mybatis：自动映射。

简单来说就是为了使数据层更灵活，更方便。

为什么使用Spring?

spring 的两个大的特点就是控制反转（Ioc）和面向切面（AOP）

1、轻量级的容器框架没有侵入性；

2、使用IoC容器更加容易组合对象之间的直接关系，面向接口编程，降低耦合；

3、使用AOP可以更加容易的进行功能扩展；

4、创建对象默认是单例的，不需要再使用单例模式进行处理。

简单来说就是降低对象间的耦合性，简化开发，编写出易于管理的代码。

为什么使用SrpingMVC？

1、进行更简洁的Web层的开发；

2、天生与Spring框架集成（如IoC容器、AOP等）；

3、提供强大的约定大于配置的契约式编程支持；

4、支持灵活的URL到页面控制器的映射；

5、非常容易与其他视图技术集成，如Velocity、FreeMarker等等，因为模型数据不放在特定的API里，而是放在一个Model里（Map数据结构实现，因此很容易被其他框架使用）；

6、非常灵活的数据验证、格式化和数据绑定机制，能使用任何对象进行数据绑定，不必实现特定框架的API；

7、支持Restful风格。

为什么使用ssm

简单案例：

一，创建web项目，建好项目结构目录（controller，service，mapper等目录），引入所需的jar包并配置tomcat

这里放上最终的项目结构：

pom.xml(继承于父工程,没有写版本信息)

<?xml version="1.0" encoding="UTF-8"?>

<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">

    <parent>

        <artifactId>project_parent</artifactId>

        <groupId>com.com.zy</groupId>

        <version>1.0-SNAPSHOT</version>

        <relativePath>../project_parent/pom.xml</relativePath>

    </parent>

    <modelVersion>4.0.0</modelVersion>

    <artifactId>child_ssmDemo</artifactId>

    <packaging>war</packaging>

    <dependencies>

        <!--mybatis-->

        <dependency>

            <groupId>org.mybatis</groupId>

            <artifactId>mybatis</artifactId>

        </dependency>

        <!--spring-->

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-webmvc</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-aspects</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-test</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-jdbc</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-context</artifactId>

        </dependency>

        <!--mybatis-spring-->

        <dependency>

            <groupId>org.mybatis</groupId>

            <artifactId>mybatis-spring</artifactId>

        </dependency>

        <!--jsp相关-->

        <dependency>

            <groupId>javax.servlet</groupId>

            <artifactId>jsp-api</artifactId>

        </dependency>

        <dependency>

            <groupId>javax.servlet</groupId>

            <artifactId>servlet-api</artifactId>

        </dependency>

        <dependency>

            <groupId>jstl</groupId>

            <artifactId>jstl</artifactId>

        </dependency>

        <!--mysql-->

        <dependency>

            <groupId>mysql</groupId>

            <artifactId>mysql-connector-java</artifactId>

        </dependency>

        <!--Druid连接池-->

        <dependency>

            <groupId>com.alibaba</groupId>

            <artifactId>druid</artifactId>

            <version>1.1.9</version>

        </dependency>

        <!--json处理工具包-->

        <dependency>

            <groupId>com.fasterxml.jackson.core</groupId>

            <artifactId>jackson-databind</artifactId>

        </dependency>

        <!--junit-->

        <dependency>

            <groupId>junit</groupId>

            <artifactId>junit</artifactId>

        </dependency>

        <!--log-->

        <dependency>

            <groupId>org.slf4j</groupId>

            <artifactId>slf4j-log4j12</artifactId>

        </dependency>

        <!-- Apache工具组件 -->

        <dependency>

            <groupId>org.apache.commons</groupId>

            <artifactId>commons-lang3</artifactId>

        </dependency>

        <dependency>

            <groupId>org.apache.commons</groupId>

            <artifactId>commons-io</artifactId>

        </dependency>

        <!--PageHelper-->

        <dependency>

            <groupId>com.github.pagehelper</groupId>

            <artifactId>pagehelper</artifactId>

        </dependency>

        <dependency>

            <groupId>com.github.jsqlparser</groupId>

            <artifactId>jsqlparser</artifactId>

        </dependency>

    </dependencies>

    <build>

        <plugins>

            <!--tomcat-->

            <plugin>

                <groupId>org.apache.tomcat.maven</groupId>

                <artifactId>tomcat7-maven-plugin</artifactId>

                <version>2.2</version>

                <configuration>

                    <path>/</path>

                    <port>8080</port>

                </configuration>

            </plugin>

        </plugins>

    </build>

</project>

pom.xml

dbconfig.properties

jdbc.driverClassName=com.mysql.jdbc.Driver

jdbc.url=jdbc:mysql://127.0.0.1:3306/temp_db?useUnicode=true&characterEncoding=utf8&autoReconnect=true&allowMultiQueries=true

jdbc.username=root

jdbc.password=root

dbconfig.properties

log4j.properties

log4j.rootLogger=DEBUG,A1

log4j.logger.com.taotao = DEBUG

log4j.logger.org.mybatis = DEBUG

log4j.appender.A1=org.apache.log4j.ConsoleAppender

log4j.appender.A1.layout=org.apache.log4j.PatternLayout

log4j.appender.A1.layout.ConversionPattern=%-d{yyyy-MM-dd HH:mm:ss,SSS} [%t] [%c]-[%p] %m%n

log4j.properties

二，准备数据库表及数据

CREATE TABLE `tb_user` (

  `id` BIGINT(20) NOT NULL AUTO_INCREMENT,

  `username` VARCHAR(100) DEFAULT NULL COMMENT '用户名',

  `password` VARCHAR(100) DEFAULT NULL COMMENT '密码',

  `name` VARCHAR(100) DEFAULT NULL COMMENT '姓名',

  `age` INT(10) DEFAULT NULL COMMENT '年龄',

  `sex` TINYINT(1) DEFAULT NULL COMMENT '性别，1男性，2女性',

  `birthday` DATE DEFAULT NULL COMMENT '出生日期',

  `created` DATETIME DEFAULT NULL COMMENT '创建时间',

  `updated` DATETIME DEFAULT NULL COMMENT '更新时间',

  PRIMARY KEY (`id`),

  UNIQUE KEY `username` (`username`)

) 

INSERT INTO `tb_user` VALUES (NULL, 'zhangxueyou', '', '张学友', '', '', '1984-08-08', '2014-09-19 16:56:04', '2014-09-21 11:24:59');

INSERT INTO `tb_user` VALUES (NULL, 'liudehua', '', '刘德华', '', '', '1991-01-01', '2014-09-19 16:56:04', '2014-09-19 16:56:04');

INSERT INTO `tb_user` VALUES (NULL, 'guofucheng', '', '郭富城', '', '', '1989-01-01', '2014-09-19 16:56:04', '2014-09-19 16:56:04');

INSERT INTO `tb_user` VALUES (NULL, 'liming', '', '黎明', '', '', '1988-09-01', '2014-09-19 16:56:04', '2014-09-19 16:56:04');

INSERT INTO `tb_user` VALUES (NULL, 'linghuchong', '', '令狐冲', '', '', '1985-01-01', '2014-09-19 16:56:04', '2014-09-19 16:56:04');

INSERT INTO `tb_user` VALUES (NULL, 'zhangsanfeng', '', '张三丰', '', '', '1988-08-08', '2014-09-20 11:41:15', '2014-09-20 11:41:15');

INSERT INTO `tb_user` VALUES (NULL, 'lixunhua', '', '李寻欢', '', '', '1988-08-08', '2014-09-20 11:41:15', '2014-09-20 11:41:15');

INSERT INTO `tb_user` VALUES (NULL, 'sunyanzi', '', '孙燕姿', '', '', '1988-08-08', '2014-09-20 11:41:15', '2014-09-20 11:41:15');

创建表及插入数据

三，先整合spring和mybatis

3.1 分析：

1. mybatis框架操作数据库 需要 sqlSessionFactory

2. sqlSessionFactory 需要 连接池 datasource

3. sqlSessionFactory的可以交给spring管理

4. mapper接口的实现也可以交给spring去管理

5. 可以在spring配置中关联mybatis的配置文件

3.2 创建User的JavaBean类：

package com.zy.model;

import org.springframework.format.annotation.DateTimeFormat;

import java.util.Date;

public class User {

    private Long id;

    // 用户名

    private String userName;

    // 密码

    private String password;

    // 姓名

    private String name;

    // 年龄

    private Integer age;

    // 性别，1男性，2女性

    private Integer sex;

    // 出生日期

    @DateTimeFormat(pattern = "yyyy-MM-dd")

    private Date birthday;

    // 创建时间

    private Date created;

    // 更新时间

    private Date updated;

    public Long getId() {

        return id;

    }

    public void setId(Long id) {

        this.id = id;

    }

    public String getuserName() {

        return userName;

    }

    public void setuserName(String userName) {

        this.userName = userName;

    }

    public String getPassword() {

        return password;

    }

    public void setPassword(String password) {

        this.password = password;

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    public Integer getAge() {

        return age;

    }

    public void setAge(Integer age) {

        this.age = age;

    }

    public Integer getSex() {

        return sex;

    }

    public void setSex(Integer sex) {

        this.sex = sex;

    }

    public Date getBirthday() {

        return birthday;

    }

    public void setBirthday(Date birthday) {

        this.birthday = birthday;

    }

    public Date getCreated() {

        return created;

    }

    public void setCreated(Date created) {

        this.created = created;

    }

    public Date getUpdated() {

        return updated;

    }

    public void setUpdated(Date updated) {

        this.updated = updated;

    }

    @Override

    public String toString() {

        return "User [id=" + id + ", userName=" + userName + ", password=" + password + ", name=" + name

                + ", age=" + age + ", sex=" + sex + ", birthday=" + birthday + ", created=" + created

                + ", updated=" + updated + "]";

    }

}

User JavaBean

3.2 创建mapper接口，并添加方法：

public interface UserMapper {

    //根据id修改名字

    public void editUserName(@Param("id") long id, @Param("name") String name);

    //获取user列表

    public List<User> getUserList();

}

3.3 在resource/mybatis下创建mybatis配置文件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>

    <!--开启驼峰标识-->

    <settings>

        <setting name="mapUnderscoreToCamelCase" value="true"/>

    </settings>

</configuration>

3.4 在resource/spring下创建spring配置文件applicationContext.xml并进行配置：

<?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 http://www.springframework.org/schema/context/spring-context.xsd">

    <!--引入外部数据库配置文件-->

    <context:property-placeholder location="classpath:dbconfig.properties"/>

    <!--配置Druid数据库-->

    <bean id="druidDataSource" class="com.alibaba.druid.pool.DruidDataSource">

        <property name="driverClassName" value="${jdbc.driverClassName}"/>

        <property name="url" value="${jdbc.url}"/>

        <property name="username" value="${jdbc.username}"/>

        <property name="password" value="${jdbc.password}"/>

    </bean>

    <!--mybatis依赖的 sqlsessionFactory-->

    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">

        <!--注入数据库连接-->

        <property name="dataSource" ref="druidDataSource"/>

        <!--关联mybatis配置文件-->

        <property name="configLocation" value="classpath:mybatis/mybatis-config.xml"/>

        <!--扫描domain包 代替mybatis起别名-->

        <property name="typeAliasesPackage" value="com.zy.domain"/>

        <!--关联mapper.xml文件-->

        <property name="mapperLocations" value="classpath:mybatis/mapper/**/*Mapper.xml"/>

    </bean>

    <!--扫描mapper接口包 srping使用动态代理创建mapper接口实现类-->

    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">

        <property name="basePackage" value="com.zy.mapper"></property>

    </bean>

</beans>

3.5 在resource/mybatis/mapper下创建UserMapper对应的UserMapper.xml文件：

<?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.zy.mapper.UserMapper">

    <update id="editUserName">

        update tb_user set name=#{name} where id=#{id}

    </update>

</mapper>

3.6 mapper单元测试：

@RunWith(SpringJUnit4ClassRunner.class)

@ContextConfiguration(locations = "classpath:spring/applicationContext.xml")

public class UserMapperTest {

    @Value("#{userMapper}")

    UserMapper userMapper;

    @Test

    public void editUserName() throws Exception {

        userMapper.editUserName(1, "张三三");

    }

}

四，添加业务层并添加事务

4.1 applicationContext.xml中添加事务管理器配置，并开启事务注解

<?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: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 http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">

    <!--引入外部数据库配置文件-->

    <context:property-placeholder location="classpath:dbconfig.properties"/>

    <!--配置Druid数据库-->

    <bean id="druidDataSource" class="com.alibaba.druid.pool.DruidDataSource">

        <property name="driverClassName" value="${jdbc.driverClassName}"/>

        <property name="url" value="${jdbc.url}"/>

        <property name="username" value="${jdbc.username}"/>

        <property name="password" value="${jdbc.password}"/>

    </bean>

    <!--mybatis依赖的 sqlsessionFactory-->

    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">

        <!--注入数据库连接-->

        <property name="dataSource" ref="druidDataSource"/>

        <!--关联mybatis配置文件-->

        <property name="configLocation" value="classpath:mybatis/mybatis-config.xml"/>

        <!--扫描domain包 代替mybatis起别名-->

        <property name="typeAliasesPackage" value="com.zy.domain"/>

        <!--关联mapper.xml文件-->

        <property name="mapperLocations" value="classpath:mybatis/mapper/**/*Mapper.xml"/>

    </bean>

    <!--扫描mapper接口包 srping使用动态代理创建mapper接口实现类-->

    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">

        <property name="basePackage" value="com.zy.mapper"></property>

    </bean>

    <!--实例化 事务管理器-->

    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">

        <property name="dataSource" ref="druidDataSource"/>

    </bean>

    <!--开启事务注解-->

    <tx:annotation-driven transaction-manager="transactionManager"/>

    <!--扫描注解 业务层交给spring管理-->

    <context:component-scan base-package="com.zy.service"></context:component-scan>

</beans>

4.2 创建业务类UserService添加注解并配置扫描注解将业务层交给spring管理（已经在上面提前加上了）：

@Service

public class UserService {

    @Value("#{userMapper}")

    private UserMapper userMapper;

    //同时修改两个id的name

    @Transactional

    public void eidtUserNames(long id1, String name1, long id2, String name2) {

        userMapper.editUserName(id1, name1);

        int i = 1 / 0;//制造异常

        userMapper.editUserName(id2, name2);

    }

}

4.3 单元测试：

@RunWith(SpringJUnit4ClassRunner.class)

@ContextConfiguration(locations = "classpath:spring/applicationContext.xml")

public class UserServiceTest {

    @Value("#{userService}")

    private UserService userService;

    @Test

    public void eidtUserNames() throws Exception {

        userService.eidtUserNames(1, "张影帝", 2, "刘天王");

    }

}

五，在上面的基础上整合SpringMVC

5.1 在web.xml中配置监听器，以便在tomcat启动后直接实例化spring容器：

<?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_3_1.xsd"

         version="3.1">

    <!--指定spring配置文件的位置-->

    <context-param>

        <param-name>contextConfigLocation</param-name>

        <param-value>classpath:spring/applicationContext.xml</param-value>

    </context-param>

    <!--tomcat启动后实例化spring容器的监听器-->

    <listener>

        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>

    </listener>

</web-app>

5.2 在web.xml中配置DispatcherServlet信息：

<?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_3_1.xsd"

         version="3.1">

    <!--指定spring配置文件的位置-->

    <context-param>

        <param-name>contextConfigLocation</param-name>

        <param-value>classpath:spring/applicationContext.xml</param-value>

    </context-param>

    <!--处理post乱码的过滤器-->

    <filter>

        <filter-name>encoding</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>encoding</filter-name>

        <url-pattern>/*</url-pattern>

    </filter-mapping>

    <!--配置监听器-->

    <listener>

        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>

    </listener>

    <!--配置servlet信息-->

    <servlet>

        <servlet-name>springmvc</servlet-name>

        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

        <!--加载springmvc的配置文件-->

        <init-param>

            <param-name>contextConfigLocation</param-name>

            <param-value>classpath:spring/applicationContext_springmvc.xml</param-value>

        </init-param>

    </servlet>

    <servlet-mapping>

        <servlet-name>springmvc</servlet-name>

        <!--拦截-->

        <url-pattern>*.do</url-pattern>

    </servlet-mapping>

</web-app>

5.3 添加并配置5.2中整合mvc的配置文件applicationContext_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: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 http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

    <!--HandlerMapping和HandlerAdapter-->

    <mvc:annotation-driven/>

    <!--扫描controller包-->

    <context:component-scan base-package="com.zy.controller"/>

    <!--视图解析器-->

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">

        <!--前缀-->

        <property name="prefix" value="/WEB-INF/views/"/>

        <!--后缀-->

        <property name="suffix" value=".jsp"/>

    </bean>

    <!--对于静态资源不拦截-->

    <mvc:default-servlet-handler/>

</beans>

5.4 创建WEB-INF/views文件夹并创建UserController：

@Controller

@RequestMapping("/user")

public class UserController {

    @Value("#{userService}")

    private UserService userService;

    @RequestMapping("/editUsers")

    public ModelAndView editUserNames() {

        ModelAndView mv = new ModelAndView("success");

        userService.eidtUserNames(1, "张天王", 2, "刘影帝");

        mv.addObject("msg", "success");

        return mv;

    }

}

运行tomcat访问http://localhost:8080/user/editUsers，然后看一下数据库数据是否已经改变即可。

再来把User列表的json数据信息返回到页面：

UserMapper添加方法：

public interface UserMapper {

    //根据id修改名字

    public void editUserName(@Param("id") long id, @Param("name") String name);

    //获取user列表

    public List<User> getUserList();

}

UserMapper.xml添加sql：

<?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.zy.mapper.UserMapper">

    <update id="editUserName">

        update tb_user set name=#{name} where id=#{id}

    </update>

    <select id="getUserList" resultType="User">

        select * from tb_user

    </select>

</mapper>

UserService添加获取list方法：

@Service

public class UserService {

    @Value("#{userMapper}")

    private UserMapper userMapper;

    //同时修改两个id的name

    @Transactional

    public void eidtUserNames(long id1, String name1, long id2, String name2) {

        userMapper.editUserName(id1, name1);

        //int i = 1 / 0;

        userMapper.editUserName(id2, name2);

    }

    //获取userlist数据

    public List<User> getUserList() {

        return userMapper.getUserList();

    }

}

UserController添加对应的controller方法：

@Controller

@RequestMapping("/user")

public class UserController {

    @Value("#{userService}")

    private UserService userService;

    @RequestMapping("/editUsers")

    public ModelAndView editUserNames() {

        ModelAndView mv = new ModelAndView("success");

        userService.eidtUserNames(1, "张天王", 2, "刘影帝");

        mv.addObject("msg", "success");

        return mv;

    }

    @RequestMapping("/userList")

    @ResponseBody

    public ModelAndView getUserList() {

        ModelAndView mv = new ModelAndView("user_list");

        mv.addObject("userList", userService.getUserList().toString());

        return mv;

    }

}

运行tomcat访问http://localhost:8080/user/userList.do：

以上。