Spring、SpringMVC、MyBatis整合

这篇文章不会教你Spring、SpringMVC、MyBatis具体的知识，而是教你如何整合这3大框架快速上手进行开发

整合的项目已同步至GitHub ==> Click

环境：

• JDK12 (建议JDK1.8)
• maven-3.6.3
• Tomcat 9.0.24
• MySQL 5.7.29
• Spring：5.0.2.RELEASE
• spring-web：5.0.2.RELEASE
• MyBatis：3.4.5

架构：

• Spring 作为业务层，整合 SpringMVC 和 MyBatis，处理数据
• SpringMVC 作为表现层，显示数据
• MyBatis 作为持久层，与数据库交互

常用网站：

maven仓库

MyBatis官方文档

创建Maven项目

根据maven提供的archetype选择webapp

项目名称：可以自己命名，这里统一为SpringMVC

在这里我们选择自己安装的maven目录和setting.xml的配置文件，最好在自己的setting.xml文件中配置阿里云的镜像，否则下载jar包会非常缓慢

<mirrors>
     <mirror>
     	<id>nexus-aliyun</id>
     	<name>Nexus aliyun</name>
     	<url>http://maven.aliyun.com/nexus/content/groups/public/</url>
     	<mirrorOf>central</mirrorOf>
     </mirror>
</mirrors>

项目创建完成后，在右下角点 Enable Auto-Import，这样IDE就会自动为我们导jar包

配置工作区目录

创建完的Maven项目目录是这样的结构，接下来我们要进行完善

在

main目录下，创建java和resource

如果因为IDE版本问题，创建目录没有提示的情况下，就创建两个普通的目录取名java和resource，然后右击创建出的目录，对应java文件夹是Source Root ，resource文件夹是Resources Root

在java目录下面创建这样几个包 Controller控制器所在包、dao数据库访问接口包、entity对应JavaBean所在包，Service对应一些业务逻辑编写

配置pom.xml文件

配置properties下面的目录，方便我们对依赖jar包版本的管理

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
    <spring.version>5.0.2.RELEASE</spring.version>
    <slf4j.version>1.6.6</slf4j.version>
    <log4j.version>1.2.12</log4j.version>
    <mysql.version>5.1.6</mysql.version>
    <mybatis.version>3.4.5</mybatis.version>
    <jackson.version>2.9.8</jackson.version>
</properties>

配置dependencies

<dependencies>
    <!-- spring -->
    <dependency>
      <groupId>org.aspectj</groupId>
      <artifactId>aspectjweaver</artifactId>
      <version>1.6.8</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aop</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-web</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-tx</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>${mysql.version}</version>
    </dependency>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>servlet-api</artifactId>
      <version>2.5</version>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>javax.servlet.jsp</groupId>
      <artifactId>jsp-api</artifactId>
      <version>2.0</version>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>jstl</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
    </dependency>
    <!-- log start -->
    <dependency>
      <groupId>log4j</groupId>
      <artifactId>log4j</artifactId>
      <version>${log4j.version}</version>
    </dependency>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-api</artifactId>
      <version>${slf4j.version}</version>
    </dependency>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-log4j12</artifactId>
      <version>${slf4j.version}</version>
    </dependency>
    <!-- log end -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>${mybatis.version}</version>
    </dependency>
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>1.3.0</version>
    </dependency>
    <dependency>
      <groupId>c3p0</groupId>
      <artifactId>c3p0</artifactId>
      <version>0.9.1.2</version>
      <type>jar</type>
      <scope>compile</scope>
    </dependency>
    <!-- json begin -->
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
        <version>${jackson.version}</version>
    </dependency>
	<dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-core</artifactId>
      <version>${jackson.version}</version>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-annotations</artifactId>
      <version>${jackson.version}</version>
    </dependency>
    <!-- json end -->
</dependencies>

配置resource和Web.xml

在resource目录下创建2个xml文件和1个properties的文件，分别是：

ApplicationContext.xml ===> Spring的配置文件

log4j.properties ===> 日志的相关配置

springmvc.xml ===> SpringMVC的配置文件

ApplicationContext.xml

根据自己配置需要修改部分请一定看注释

<?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:aop="http://www.springframework.org/schema/aop"
       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/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">

    <!--配置扫描注解，进行依赖注入-->
    <context:component-scan base-package="com.rick">
        <!-- 配置要忽略的注解Controller交给SpringMVC去控制 -->
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>

    <!--Spring整合MyBatis-->
    
    <!-- 配置数据源 根据自己的mysql具体数据库进行配置，我这里对应的ssm数据库，root用户，密码 257098 -->
    <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/ssm"/>
        <property name="user" value="root"/>
        <property name="password" value="257098"/>
    </bean>
    <!-- 配置 SqlSession 工厂 -->
    <bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 引入数据源 -->
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <!-- 配置 Dao 接口所在类-->
    <!-- 根据自己dao包所在位置进行配置 -->
    <bean id="mapperScanner" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.rick.dao"/>
    </bean>
	
</beans>

log4j.properties

直接复制

# Set root category priority to INFO and its only appender to CONSOLE.
#log4j.rootCategory=INFO, CONSOLE            debug   info   warn error fatal
log4j.rootCategory=info, CONSOLE, LOGFILE

# Set the enterprise logger category to FATAL and its only appender to CONSOLE.
log4j.logger.org.apache.axis.enterprise=FATAL, CONSOLE

# CONSOLE is set to be a ConsoleAppender using a PatternLayout.
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPatern=%d{ISO8601} %-6r [%15.15t] %-5p %30.30c %x - %m\n
t
# LOGFILE is set to be a File appender using a PatternLayout.
log4j.appender.LOGFILE=org.apache.log4j.FileAppender
log4j.appender.LOGFILE.File=d:\axis.log
log4j.appender.LOGFILE.Append=true
log4j.appender.LOGFILE.layout=org.apache.log4j.PatternLayout
log4j.appender.LOGFILE.layout.ConversionPattern=%d{ISO8601} %-6r [%15.15t] %-5p %30.30c %x - %m\n

springmvc.xml

有部分需自己修改看注释

<?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">
    <!-- 扫描Controller的注解 ==> 对应自己的包 -->
    <context:component-scan base-package="com.rick">
        <!-- 只扫描 controller-->
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>

    <!-- 配置视图解析器 -->
    <bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/pages/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
    <!-- 开启对SpringMVC注解的支持 -->
    <mvc:annotation-driven/>

</beans>

web.xml

<!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>
  <!-- 将过滤器配置在servlet前面，否则IDE会报错 -->
  <!-- 配置过滤器，解决中文乱码问题-->
  <filter>
    <filter-name>characterEncodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <!-- 字符集初始化为 UTF-8 -->
    <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>

  <!-- 配置 spring 的监听器，默认只加载 WEB-INF 目录下的 applicationContext.xml 配置文件 -->
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>

  <!-- 配置DispatcherServlet前端控制器-->
  <servlet>
    <servlet-name>dispatcherServlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <!-- 加载 springmvc.xml -->
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:springmvc.xml</param-value>
    </init-param>
    <!-- 启动服务器，加载该servlet -->
    <load-on-startup>1</load-on-startup>
  </servlet>

  <servlet-mapping>
    <servlet-name>dispatcherServlet</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>

</web-app>

在配置web.xml的时候这里注意几个点根据自己的命名来确定：

创建数据库表、实体类

在MySQL数据库管理工具中运行以下SQL创建数据库（该数据库定义了主键递增）

CREATE DATABASE ssm;
USE ssm;
CREATE TABLE user(
	id int primary key auto_increment,
	name varchar(20),
	age int 
);
INSERT INTO user(name,age) VALUES('aaa',12);
INSERT INTO user(name,age) VALUES('bbb',34);
INSERT INTO user(name,age) VALUES('ccc',56);

entity

在entity包下创建User类

package com.rick.entity;

/**
 * @Author: Rick
 * @Date: 2020/2/28 13:55
 * @Description:
 */
public class User {
    private Integer id;
    private String name;
    private Integer age;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    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;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
}

dao

dao包下创建数据库访问接口UserDao，并声明注解 @Repository交由Spring进行管理，声明@Mapper 对应MyBatis的SqlMapper

package com.rick.dao;

import com.rick.entity.User;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;
import org.springframework.stereotype.Repository;

import java.util.List;

/**
 * @Author: Rick
 * @Date: 2020/2/28 13:58
 * @Description:
 */
@Repository
@Mapper
public interface UserDao {

    @Insert("insert into user(name,age) values(#{name},#{age})")
    public void insertUser(User user);

    @Select("select * from user")
    public List<User> queryAll();
}

Service

Service包下面创建接口UserService和实现类UserServiceImp

UserService中定义逻辑接口

package com.rick.Service;

import com.rick.entity.User;

import java.util.List;

/**
 * @Author: Rick
 * @Date: 2020/2/28 14:04
 * @Description:
 */
public interface UserService {
    public void insertUser(User user);
    public List<User> queryAll();
}

实现类UserServiceImp声明注解@Service交由Spring管理

package com.rick.Service.ServiceImp;

import com.rick.Service.UserService;
import com.rick.dao.UserDao;
import com.rick.entity.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

/**
 * @Author: Rick
 * @Date: 2020/2/28 14:06
 * @Description:
 */
@Service
public class UserServiceImp implements UserService {
    @Autowired
    private UserDao userDao;

    @Override
    public void insertUser(User user) {
        userDao.insertUser(user);
        System.out.println("插入User后：");
        System.out.println(userDao.queryAll());
    }

    @Override
    public List<User> queryAll() {
        System.out.println("Service查询全部数据：");
        System.out.println(userDao.queryAll());
        return userDao.queryAll();
    }
}

Controller

UserController声明注解 @Controller交由Spring管理，该类下面第一级路由信息@RequestMapping("/User") @ResponseBody使方法的返回的数据为JSON格式

package com.rick.Controller;

import com.rick.Service.ServiceImp.UserServiceImp;
import com.rick.entity.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

/**
 * @Author: Rick
 * @Date: 2020/2/28 14:15
 * @Description:
 */
@Controller
@RequestMapping("/User")
@ResponseBody
public class UserController {
    @Autowired
    private UserServiceImp userServiceImp;

    @RequestMapping("/insert")
    public String insertUser(User user){
        userServiceImp.insertUser(user);
        return user.toString();
    }

    @RequestMapping("/getAll")
    public String getAll(){
        return userServiceImp.queryAll().toString();
    }
}

配置Tomcat服务器

选择Artifact

在这里可以配置整个这个SpringMVC项目的URL，默认是http://localhost:8080/SpringMVC_war/

启动项目

启动后先是自动跳转到index.jsp页面下

查询

根据自己配置的路由信息即可进行查询，这里就以JSON数据的格式返回

插入

由于我们定义了自增主键id，因此插入数据库中的数据id是根据数据库自增的，并不是null

至此，一个SSM的项目就可以运行起来，但仍有一功能不够完善，还需一些额外配置

异常处理

在项目下创建一个存放自定义异常处理类的包 Exception和config

在Exception包下面创建异常处理类信息

package com.rick.Exception;

/**
 * @Author: Rick
 * @Date: 2020/2/28 15:12
 * @Description: 定义异常信息
 */
public class SysException extends Exception {
    private String message;

    public SysException(String message) {
        this.message = message;
    }

    public SysException() {
        
    }

    @Override
    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }
}

config包下面创建类进行异常统一处理跳转

package com.rick.config;

import com.rick.Exception.SysException;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerExceptionResolver;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * @Author: Rick
 * @Date: 2020/2/28 15:33
 * @Description: 统一异常处理
 */
@Component
public class MyExceptionResolver implements HandlerExceptionResolver {
    @Override
    public ModelAndView resolveException(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) {
        SysException se = null;
        if (e instanceof SysException){
            se = (SysException)e;
        }else {
            se = new SysException("系统正在维护中");
        }
        System.out.println(se.getMessage());
        ModelAndView mv = new ModelAndView();
        mv.addObject("errorMsg",se.getMessage());
        // 指定跳转到 WEB-INF/pages/error.jsp
        mv.setViewName("error");
        return  mv;
    }
}

创建error.jsp

<%--
  Created by IntelliJ IDEA.
  User: Rick
  Date: 2020/2/28
  Time: 15:38
  To change this template use File | Settings | File Templates.
--%>
<%--不忽略EL表达式--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<html>
<head>
    <title>Error</title>
</head>
<body>
    <h1>Error</h1>
    <h2>${errorMsg}</h2>
</body>
</html>

在springmvc.xml中配置异常处理器

<!-- 对应自己写的异常类 --> 
<bean id="sysException" class="com.rick.Exception.SysException"/>

当我们Controller中方法在调用时抛出异常就会被捕获

@RequestMapping("/hello")
public void hello(){
    int a = 10/0;
    System.out.println(a);
}

配置过滤器和拦截器

通过SpringMVC配置过滤器放行静态资源

在springmvc.xml中进行配置

<!--配置哪些资源不拦截-->
<mvc:resources mapping="/js/**" location="/js/"/>
<mvc:resources mapping="/images/**" location="/images/"/>
<mvc:resources mapping="/css/**" location="/css/"/>

配置拦截器（AOP思想）

在config包下面创建MyInterceptor

package com.rick.config;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * @Author: Rick
 * @Date: 2020/2/28 16:55
 * @Description: 拦截器
 */
public class MyInterceptor implements HandlerInterceptor {
    /**
     * Controller方法执行之前的预处理，决定是否放行，可用于登录拦截是否放行
     * @param request
     * @param response
     * @param handler
     * @return 是否放行(true/false)
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("preHandle执行了---Controller执行之前");
//        决定是否拦截跳转
//        request.getRequestDispatcher("/WEB-INF/pages/error.jsp").forward(request,response);
        return true;
    }

    /**
     * Controller方法执行之后，DispatcherServlet视图渲染之前执行，可以对ModelAndView进行操作
     * @param request
     * @param response
     * @param handler
     * @param modelAndView
     * @throws Exception
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("postHandle执行了---Controller方法执行之后，DispatcherServlet视图渲染之前执行");
        //        request.getRequestDispatcher("/WEB-INF/pages/error.jsp").forward(request,response);
    }

    /**
     * DispatcherServlet视图渲染结束后执行，一般进行资源的释放
     * @param request
     * @param response
     * @param handler
     * @param ex
     * @throws Exception
     */
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("afterCompletion执行了---最后");
    }
}

在springmvc.xml中进行配置

<mvc:interceptors>
    <mvc:interceptor>
        <!--需要拦截的方法-->
        <mvc:mapping path="/User/**"/>
        <!--不拦截的方法 <mvc:exclude-mapping path=""/>-->

        <!--配置拦截器对象-->
        <bean class="com.rick.config.MyInterceptor"/>
	</mvc:interceptor>
	<!-- 配置多个拦截器时，按顺序配置即可 -->
</mvc:interceptors>

当我执行User中方法时就可以看到拦截的效果：

MyBatis中使用Mapper.xml配置

对于简单SQL语句来说，注解使代码显得更加简洁,使用@Mapper和@Repository比较方便，但当我们涉及到一些复杂SQL语句需要传参和动态SQL的时候，注解就会显得比较麻烦，此时应该采用xml的语句映射方式

我们在dao下面创建测试的接口UserTestDao !!!注意：我们不需要在接口上声明任何注解

package com.rick.dao;

import com.rick.entity.User;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Repository;

import java.util.List;

/**
 * @Author: Rick
 * @Date: 2020/2/28 18:01
 * @Description:
 */
public interface UserTestDao {
    public void insertUser(User user);
    public List<User> queryAll();
}

在resource目录下面创建mapper目录并在下面创建UserTestDao.xml 和mybatis.xml

mybatis.xml ==> 这里面的settings 具体细节可查官方文档进行配置，为了简便，我们这里就不做配置

<?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>

</configuration>

UserMapper.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.rick.dao.UserTestDao">
    <!--
		mapper接口的方法名称要和mapper映射文件的statement的id一致。
		mapper接口的方法参数类型要和mapper映射文件的statement的parameterType的值一致，而且它的参数是一个。
		mapper接口的方法返回值类型要和mapper映射文件的statement的resultType的值一致。
	 -->
    <!--parameterType可以省略-->
    <insert id="insertUser" parameterType="com.rick.entity.User">
        insert into user(name, age) values (#{name}, #{age})
    </insert>

    <!--注意如果返回的是集合，那应该设置为集合包含的类型，而不是集合本身。-->
    <select id="queryAll" resultType="com.rick.entity.User">
        select * from user
    </select>

</mapper>

注意在配置对象参数和返回参数时，一定要配上java目录下面的引用，我这里是 com.rick.entity.User，若只写User，那么在编译时会找不到User类而报错

ApplicationContext.xml中配置SqlSession 工厂加入mapperLocations和configLocation

<!-- 配置 SqlSession 工厂 -->
<bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
    <!-- 引入数据源 -->
    <property name="dataSource" ref="dataSource"/>
    <property name="mapperLocations" value="classpath:mapper/*.xml"/>
    <property name="configLocation" value="classpath:mybatis.xml"/>
</bean>

至此，UserTestDao便与UserDao的功能一样了，只不过UserTsetDao是通过mapper和xml进行配置，UserDao直接通过注解方式进行配置，各有优点，根据实际情况合理选用一种

配置JDBC事务

配置ApplicationContext.xml

<!--开启Spring的事务-->
    <!--配置事务管理器-->
    <bean id="dataSourceTransactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>
    <!--启用Spring事务的注解功能-->
    <tx:annotation-driven transaction-manager="dataSourceTransactionManager"/>

然后们就可以在业务Service层进行声明注解@Transactional

至此，一个较为完整的SSM整合基本完成~