Spring+Spring mvc+Mybatis整合教程(基于Maven)

Posted 2020-07-23 husencd

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1. 概述

1.1 Spring

轻量级：Spring是非侵入性的，基于Spring开发的应用中的对象可以不依赖于 Spring 的 API
依赖注入(DI:dependency injection、IOC)
面向切面编程(AOP:aspect oriented programming)
容器：Spring是一个容器，包含并且管理应用对象的生命周期
框架：Spring 实现了使用简单的组件配置组合成一个复杂的应用.，在Spring中可以使用XML和Java注解组合这些对象
一站式：在IOC和AOP的基础上可以整合各种企业应用的开源框架和优秀的第三方类库（实际上Spring自身也提供了展现层的Spring MVC和持久层的Spring JDBC）

1.2 Spring MVC

Spring为展现层提供的基于MVC设计理念的优秀的Web框架，是目前最主流的MVC框架之一
Spring3.0后全面超越Struts2，成为最优秀的MVC框架
Spring MVC通过一套MVC注解，让POJO成为处理请求的控制器，而无须实现任何接口
支持RESTful风格的URL请求
采用了松散耦合可插拔组件结构，比其他MVC框架更具扩展性和灵活性

1.3 MyBatis

MyBatis是支持普通SQL查询，存储过程和高级映射的优秀持久层框架。MyBatis消除了几乎所有的JDBC代码和参数的手工设置以及对结果集的检索封装。MyBatis可以使用简单的XML或注解用于配置和原始映射，将接口和Java的POJO（Plain Old Java Objects，普通的Java对象）映射成数据库中的记录。

2. 项目结构

技术分享

3. 整合过程

3.1 配置文件

3.1.1 使用Maven管理jar包

pom.xml配置如下：

    <build>
        <finalName>ssm</finalName>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.1</version>
                <!--统一源代码和编译输出的JDK版本-->
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.3.2</version>
                <configuration>
                    <verbose>true</verbose>
                    <overwrite>true</overwrite>
                </configuration>
            </plugin>
        </plugins>
    </build>
    <properties>
        <!--统一源代码的编码方式-->
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <!-- spring版本号 -->
        <spring.version>4.2.2.RELEASE</spring.version>
        <!-- mybatis版本号 -->
        <mybatis.version>3.2.8</mybatis.version>
        <!-- log4j日志文件管理包版本 -->
        <slf4j.version>1.7.7</slf4j.version>
        <log4j.version>1.2.17</log4j.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <!--表示开发的时候引入，发布的时候不会加载此包 -->
            <scope>test</scope>
        </dependency>

        <!-- spring核心包 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>${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-oxm</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>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring.version</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-expression</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <!-- mybatis核心包 -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>${mybatis.version}</version>
        </dependency>
        <!-- mybatis/spring包 -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.2.2</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis.generator</groupId>
            <artifactId>mybatis-generator-core</artifactId>
            <version>1.3.2</version>
        </dependency>

        <!-- 导入java ee jar包 -->
        <dependency>
            <groupId>javax</groupId>
            <artifactId>javaee-api</artifactId>
            <version>7.0</version>
            <!--只参与编译，无需参与打包-->
            <scope>provided</scope>
        </dependency>
        <!-- JSTL标签类 -->
        <dependency>
            <groupId>jstl</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
            <!--运行时需要，无需参与编译-->
            <scope>runtime</scope>
        </dependency>

        <!-- 导入mysql数据库链接jar包 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.30</version>
        </dependency>

        <!-- 导入dbcp的jar包，用来在spring-mybatis.xml中配置数据库 -->
        <dependency>
            <groupId>commons-dbcp</groupId>
            <artifactId>commons-dbcp</artifactId>
            <version>1.2.2</version>
        </dependency>

        <!-- 日志文件管理包 -->
        <!-- log start -->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>${log4j.version}</version>
        </dependency>
        <!-- 格式化对象，方便输出日志 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.1.41</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>${slf4j.version}</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>${slf4j.version}</version>
        </dependency>
        <!-- log end -->

        <!-- 映入JSON -->
        <dependency>
            <groupId>org.codehaus.jackson</groupId>
            <artifactId>jackson-mapper-asl</artifactId>
            <version>1.9.13</version>
        </dependency>

        <!-- 上传组件包 -->
        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.3.1</version>
        </dependency>
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.4</version>
        </dependency>
        <dependency>
            <groupId>commons-codec</groupId>
            <artifactId>commons-codec</artifactId>
            <version>1.9</version>
        </dependency>

        <dependency>
            <groupId>org.apache.maven</groupId>
            <artifactId>maven-plugin-api</artifactId>
            <version>3.3.3</version>
        </dependency>

        <!--druid连接池-->
        <!--<dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.0.16</version>
        </dependency>
        -->
        <!--beetl模板引擎-->
        <dependency>
            <groupId>org.beetl</groupId>
            <artifactId>beetl-core</artifactId>
            <version>2.2.1</version>
        </dependency>

        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>2.6.0</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.6.0</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-annotations</artifactId>
            <version>2.6.0</version>
        </dependency>
    </dependencies>

3.1.2 建立JDBC属性文件:jdbc.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://127.0.0.1/ssmdemo
jdbc.username=root
jdbc.password=123456
#定义初始连接数
jdbc.initialSize=0
#定义最大连接数
jdbc.maxActive=20
#定义最大空闲
jdbc.maxIdle=20
#定义最小空闲
jdbc.minIdle=1
#定义最长等待时间
jdbc.maxWait=60000

3.1.3 Log4j的配置:log4j.properties

#定义LOG输出级别
log4j.rootLogger=INFO,Console,File
#定义日志输出目的地为控制台
log4j.appender.Console=org.apache.log4j.ConsoleAppender
log4j.appender.Console.Target=System.out
#可以灵活地指定日志输出格式，下面一行是指定具体的格式
log4j.appender.Console.layout = org.apache.log4j.PatternLayout
log4j.appender.Console.layout.ConversionPattern=[%c] - %m%n

#文件大小到达指定尺寸的时候产生一个新的文件
log4j.appender.File = org.apache.log4j.RollingFileAppender
#指定输出目录
log4j.appender.File.File = logs/ssm.log
#定义文件最大大小
log4j.appender.File.MaxFileSize = 10MB
# 输出所以日志，如果换成DEBUG表示输出DEBUG以上级别日志
log4j.appender.File.Threshold = ALL
log4j.appender.File.layout = org.apache.log4j.PatternLayout
log4j.appender.File.layout.ConversionPattern =[%p] [%d{yyyy-MM-dd HH:mm:ss}][%c]%m%n

3.1.4 建立spring-mybatis.xml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: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/tx
           http://www.springframework.org/schema/tx/spring-tx.xsd
           http://www.springframework.org/schema/context
           http://www.springframework.org/schema/context/spring-context.xsd">

        <context:component-scan base-package="com.shihusen.ssm"/>
        <!--1. 引入配置文件 -->
        <bean id="placeholderConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
            <property name="location" value="classpath:/properties/jdbc.properties"/>
        </bean>
        <!--2.<context:property-placeholder location="classpath:/properties/jdbc.properties"/>-->
        <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
            destroy-method="close">
            <property name="driverClassName" value="${jdbc.driver}" />
            <property name="url" value="${jdbc.url}" />
            <property name="username" value="${jdbc.username}" />
            <property name="password" value="${jdbc.password}" />
            <!-- 初始化连接大小 -->
            <property name="initialSize" value="${jdbc.initialSize}"></property>
            <!-- 连接池最大数量 -->
            <property name="maxActive" value="${jdbc.maxActive}"></property>
            <!-- 连接池最大空闲 -->
            <property name="maxIdle" value="${jdbc.maxIdle}"></property>
            <!-- 连接池最小空闲 -->
            <property name="minIdle" value="${jdbc.minIdle}"></property>
            <!-- 获取连接最大等待时间 -->
            <property name="maxWait" value="${jdbc.maxWait}"></property>
        </bean>

        <!-- spring和MyBatis完美整合，不需要mybatis的配置映射文件 -->
        <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
            <property name="dataSource" ref="dataSource"/>
            <!-- 自动扫描mapping.xml文件 -->
            <property name="mapperLocations" value="classpath:mapper/*Mapper.xml"/>
            <property name="typeAliasesPackage" value="com.shihusen.ssm.entity"/>
        </bean>

        <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
            <property name="basePackage" value="com.shihusen.ssm.dao"/>
            <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
        </bean>
        <!-- 4. 事务管理 : DataSourceTransactionManager -->
        <bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
            <property name="dataSource" ref="dataSource"/>
        </bean>
        <!-- 5. 使用声明式事务 -->
        <tx:annotation-driven transaction-manager="txManager"/>
        <!--
        事物的具体内容
       -->
        <!--<tx:advice id="transactionAdvice" transaction-manager="transactionManager">-->
        <!--<tx:attributes>-->
        <!--<tx:method name="add*" propagation="REQUIRED" />-->
        <!--<tx:method name="insert*" propagation="REQUIRED" />-->
        <!--<tx:method name="save*" propagation="REQUIRED" />-->
        <!--<tx:method name="update*" propagation="REQUIRED" />-->
        <!--<tx:method name="edit*" propagation="REQUIRED" />-->
        <!--<tx:method name="delete*" propagation="REQUIRED" />-->
        <!--<tx:method name="get*" propagation="SUPPORTS" />-->
        <!--<tx:method name="find*" propagation="SUPPORTS" />-->
        <!--<tx:method name="search*" propagation="SUPPORTS" />-->
        <!--<tx:method name="*" propagation="SUPPORTS" />-->
        <!--</tx:attributes>-->
        <!--</tx:advice>-->

        <!--定义一个切面,在定义的切面上加入事物-->
        <!--<aop:config>-->
        <!--<aop:pointcut id="transactionPointcut" expression="execution(* com.shihusen.ssm.service..*Impl.*(..))" />-->
        <!--<aop:advisor pointcut-ref="transactionPointcut" advice-ref="transactionAdvice" />-->
        <!--</aop:config>-->
    </beans>

3.1.5 建立springmvc.xml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: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.xsd
                     http://www.springframework.org/schema/context
                     http://www.springframework.org/schema/context/spring-context.xsd
                     http://www.springframework.org/schema/mvc
                     http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd">

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

    <mvc:annotation-driven/>

    <!--配置beetl-->
    <!--
    <bean id="beetlGroupUtilConfiguration" class="org.beetl.ext.spring.BeetlGroupUtilConfiguration" init-method="init">
    </bean>

    <bean id="beetlSpringViewResolver" class="org.beetl.ext.spring.BeetlSpringViewResolver">
        <property name="prefix" value="/page/"/>
        <property name="suffix" value=".html"/>
        <property name="contentType" value="text/html;charset=UTF-8"/>
        -->
        <!-- order指定优先使用BeetlSpringViewResolver-->
        <!--
        <property name="order" value="100"/>
    </bean>
        -->

    <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/page/"/>
        <property name="suffix" value=".html"/>
        <!--order无穷大-->
    </bean>

    <!-- 配置文件上传，如果没有使用文件上传可以不用配置，当然如果不配，那么配置文件中也不必引入上传组件包 -->
    <bean id="multipartResolver"
          class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <!-- 默认编码 -->
        <property name="defaultEncoding" value="utf-8"/>
        <!-- 文件大小最大值 -->
        <property name="maxUploadSize" value="10485760"/>
        <!-- 内存中的最大值 -->
        <property name="maxInMemorySize" value="40960"/>
    </bean>


    <!-- 1.对静态资源文件的访问 -->
    <mvc:default-servlet-handler/>


    <!--2.对静态资源文件的访问-->
    <!--<mvc:resources location="/page/" mapping="/page/**"/>-->
    <!--<mvc:resources location="/image/" mapping="/image/**"/>-->
    <!--<mvc:resources location="/js/" mapping="/js/**"/>-->
    <!--<mvc:resources location="/css/" mapping="/css/**"/>-->

    <!--配置自定义拦截器-->
    <!--
    <mvc:interceptors>
        <mvc:interceptor>
            <mvc:mapping path="/user/**"/>
            <mvc:exclude-mapping path="/user/checkLogin"/>
            <bean class="com.shihusen.ssm.interceptor.UserPreInterceptor"/>
        </mvc:interceptor>
    </mvc:interceptors>
    -->
    <!--定义异常处理页面-->
<!--
    <bean id="exceptionResolver" class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
        <property name="exceptionMappings">
            <props>
                <prop key="java.sql.SQLException">outException</prop>
                <prop key="java.io.IOException">outException</prop>
                <prop key="java.lang.Throwable">Exception</prop>
            </props>
        </property>
    </bean>
-->
</beans>

3.1.6 建立web.xml配置文件

<?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">

    <!--防止中文乱码-->
    <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>

    <!-- Spring和mybatis的配置文件 -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:config/spring-mybatis.xml</param-value>
    </context-param>

    <!-- Spring监听器 -->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <!-- 防止Spring内存溢出监听器 -->
    <listener>
        <listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class>
    </listener>

    <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:config/springmvc.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>
    <session-config>
        <session-timeout>30</session-timeout>
    </session-config>
    <!--
    <error-page>
        <error-code>404</error-code>
        <location>/page/error_page1.jsp</location>
    </error-page>
    <error-page>
        <error-code>500</error-code>
        <location>/page/error_page2.jsp</location>
    </error-page>
    -->
</web-app>

3.2 Java代码

3.2.1 建立数据库和表

DROP DATABASE IF EXISTS `ssmdemo`;
CREATE DATABASE ssmdemo;
use ssmdemo;
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
  `id` int PRIMARY KEY AUTO_INCREMENT,
  `user_name` varchar(50) NOT NULL,
  `password` varchar(50) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
INSERT INTO `user` VALUES (1, ‘root‘, ‘root‘);
INSERT INTO `user` VALUES (2,‘shihusen‘, ‘shihusen‘);

3.2.2 建立generatorConfig.xml配置文件，使用mybatis-generator自动生成代码

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
        PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
        "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">

<generatorConfiguration>
    <!--  导入属性配置
      <properties resource="jdbc.properties"></properties>-->
    <classPathEntry location="F:\MyEclipse2015\workspace\ssm\mysql-connector-java-5.1.7-bin.jar" />
    <context id="testTables" targetRuntime="MyBatis3">
        <commentGenerator>
            <!-- 是否去除自动生成的注释 true：是 ： false:否 -->
            <property name="suppressAllComments" value="true" />
        </commentGenerator>
        <!--数据库连接的信息：驱动类、连接地址、用户名、密码 -->
        <jdbcConnection driverClass="com.mysql.jdbc.Driver"
                        connectionURL="jdbc:mysql://127.0.0.1:3306/ssmdemo" userId="root"
                        password="123456">
        </jdbcConnection>

        <!-- 默认false，把JDBC DECIMAL 和 NUMERIC 类型解析为 Integer，为 true时把JDBC DECIMAL 和
            NUMERIC 类型解析为java.math.BigDecimal -->
        <javaTypeResolver>
            <property name="forceBigDecimals" value="false" />
        </javaTypeResolver>

        <!-- targetProject:生成PO类的位置 -->
        <javaModelGenerator targetPackage="com.shihusen.ssm.entity"
                            targetProject="F:\MyEclipse2015\workspace\ssm\src\main\java">
            <!-- enableSubPackages:是否让schema作为包的后缀 -->
            <property name="enableSubPackages" value="false" />
            <!-- 从数据库返回的值被清理前后的空格 -->
            <property name="trimStrings" value="true" />
        </javaModelGenerator>
        <!-- targetProject:mapper映射文件生成的位置 -->
        <sqlMapGenerator targetPackage="mapper"
                         targetProject="F:\MyEclipse2015\workspace\ssm\src\main\resources">
            <!-- enableSubPackages:是否让schema作为包的后缀 -->
            <property name="enableSubPackages" value="false" />
        </sqlMapGenerator>
        <!-- targetPackage：mapper接口生成的位置 -->
        <javaClientGenerator type="XMLMAPPER"
                             targetPackage="com.shihusen.ssm.dao"
                             targetProject="F:\MyEclipse2015\workspace\ssm\src\main\java">
            <!-- enableSubPackages:是否让schema作为包的后缀 -->
            <property name="enableSubPackages" value="false" />
        </javaClientGenerator>
        <!-- 要生成的表 tableName是数据库中的表名或视图名 domainObjectName是实体类名-->
         <table tableName="user" domainObjectName="User"
                enableCountByExample="false" enableUpdateByExample="false"
                enableDeleteByExample="false" enableSelectByExample="false"
                selectByExampleQueryId="false"></table>
    </context>
</generatorConfiguration>

在Idea下，使用mybatis-generator的方法如下图所示：
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运行之后，自动为我们生成pojo、mapper接口和mapper配置文件。

3.2.3 entity类（自动生成）

package com.shihusen.ssm.entity;

public class User {
    private Integer id;

    private String userName;

    private String password;

    public Integer getId() {
        return id;
    }

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

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName == null ? null : userName.trim();
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password == null ? null : password.trim();
    }
}

3.2.4 dao接口层（自动生成）

    package com.shihusen.ssm.dao;

import com.shihusen.ssm.entity.User;
import org.springframework.stereotype.Repository;

@Repository
public interface UserMapper {
    int checkLogin(User user);
}

3.2.5 mapper.xml配置文件（自动生成）

<?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.shihusen.ssm.dao.UserMapper" >
  <select id="checkLogin" parameterType="User" resultType="int">
    SELECT COUNT(*) from `user` where user_name = #{userName} and password = #{password}
  </select>
</mapper>

3.2.6 service接口层

package com.shihusen.ssm.service;

import com.shihusen.ssm.entity.User;

/**
 * Created by shihusen on 16-6-2.
 */
public interface UserService {
    int checkLogin(User user);
}

service接口实现层

package com.shihusen.ssm.service.impl;

import com.shihusen.ssm.dao.UserMapper;
import com.shihusen.ssm.entity.User;
import com.shihusen.ssm.service.UserService;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;

/**
 * Created by shihusen on 16-6-2.
 */
@Service("userService")
public class UserServiceImpl implements UserService{
    @Resource
    private UserMapper userMapper;

    @Override
    public int checkLogin(User user) {
        return userMapper.checkLogin(user);
    }
}

3.2.7 controller控制层

package com.shihusen.ssm.controller;

import com.shihusen.ssm.entity.User;
import com.shihusen.ssm.service.UserService;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import javax.annotation.Resource;

/**
 * Created by shihusen on 2016/6/2.
 */
@Controller
public class UserController {
    @Resource
    private UserService userService;

    @RequestMapping(value = "/login", method = RequestMethod.GET)
    public String login() {
            return "login";
    }

    @RequestMapping(value = "/login", method = RequestMethod.POST)
    public String checkLogin(User user,Model model) {
        int result = userService.checkLogin(user);
        if (1 == result) {
            model.addAttribute("userName",user.getUserName());
            return "success";
        } else {
            return "login";
        }
    }
}

3.2.8 视图层

index.jsp

<html>
<head>
    <meta charset="UTF-8">
    <title>Index Page</title>
</head>
<body align="center">
<h2>Hello World!</h2>
<a href="login"><h3>Click to login</h3></a>
</body>
</html>

login.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Login Page</title>
</head>
<body align="center">
    <form action="login" method="post">
        <br><br>
        <input type="text" name="userName" placeholder="Please input your name..."><br><br>
        <input type="password" name="password" placeholder="Please input your password..."><br><br>
        <input type="submit" value="Submit">
    </form>
</body>
</html>

welcome.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Login Success Page</title>
</head>
<body align="center">
    <% try{ %>
    <h2>Welcome, <em>${userName}</em>!</h2>
    <% }catch(error){} %>
</body>
</html>

4. 结果测试

浏览器搜索栏输入：http://localhost:8080/ssm/
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点击登录，如下：

输入userName以及password，如果和数据库匹配，跳转到欢迎页面，如下：

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