SSM框架搭建图文教程(推荐)

  • Z时代
  • 2024-01-10
  • 分类：IT

好久就想着好好搭建一个ssm框架，自己以后用也方便吧，但是最近的事真的是很多，很多事情都没有去干，有时候自己会怀疑一下人生自己该不该去做程序员，我是一个没毕业的学生，找工作真的是四处碰壁，感觉自己好难混，一个暑假换了3个公司。我其实就想找一个公司能干自己想干的技术，能学到自己想学到的东西，可是我发现太难了，几乎没有这样的公司。所以说在你不是很牛逼的时候，人得适应公司，而不是公司适应你。第一个公司的一个老程序员和我去公司必须能吃上饭，能吃上饭再想其他的东西，而我是个90后，我明白我的性格，一遇到难题就想逃避，可是逃避是最不好的道路，也是不能走的道路。希望刚毕业的同学能找到一个适合自己的工作。

一、我用的是idea

二、首先创建一个maven项目，结构如下:

三、开始写配置文件

pom文件

<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/maven-v4_0_0.xsd">
 <modelVersion>4.0.0</modelVersion>
 <groupId>com.xxx.demo</groupId>
 <artifactId>ssm</artifactId>
 <packaging>war</packaging>
 <version>1.0-SNAPSHOT</version>
 <name>ssm Maven Webapp</name>
 <url>http://maven.apache.org</url>
 <properties>
  <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
  <!-- spring版本号 -->
  <spring.version>4.2.6.RELEASE</spring.version>
  <!-- mybatis版本号 -->
  <mybatis.version>3.2.8</mybatis.version>
  <!-- mysql驱动版本号 -->
  <mysql-driver.version>5.1.29</mysql-driver.version>
  <!-- log4j日志包版本号 -->
  <slf4j.version>1.7.18</slf4j.version>
  <log4j.version>1.2.17</log4j.version>
 </properties>
 <dependencies>
  <!-- 添加jstl依赖 -->
  <dependency>
   <groupId>jstl</groupId>
   <artifactId>jstl</artifactId>
   <version>1.2</version>
  </dependency>
  <dependency>
   <groupId>javax</groupId>
   <artifactId>javaee-api</artifactId>
   <version>7.0</version>
  </dependency>
  <!-- 添加junit4依赖 -->
  <dependency>
   <groupId>junit</groupId>
   <artifactId>junit</artifactId>
   <version>4.11</version>
   <!-- 指定范围，在测试时才会加载 -->
   <scope>test</scope>
  </dependency>
  <!-- 添加spring核心依赖 -->
  <dependency>
   <groupId>org.springframework</groupId>
   <artifactId>spring-core</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-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>${spring.version}</version>
  </dependency>
  <dependency>
   <groupId>org.springframework</groupId>
   <artifactId>spring-webmvc</artifactId>
   <version>${spring.version}</version>
  </dependency>
  <dependency>
   <groupId>org.springframework</groupId>
   <artifactId>spring-context</artifactId>
   <version>${spring.version}</version>
  </dependency>
  <dependency>
   <groupId>org.springframework</groupId>
   <artifactId>spring-aspects</artifactId>
   <version>4.3.8.RELEASE</version>
  </dependency>
  <dependency>
   <groupId>org.springframework</groupId>
   <artifactId>spring-context-support</artifactId>
   <version>${spring.version}</version>
  </dependency>
  <dependency>
   <groupId>org.springframework</groupId>
   <artifactId>spring-aop</artifactId>
   <version>${spring.version}</version>
  </dependency>
  <dependency>
   <groupId>org.springframework</groupId>
   <artifactId>spring-test</artifactId>
   <version>${spring.version}</version>
  </dependency>
  <!-- 添加mybatis依赖 -->
  <dependency>
   <groupId>org.mybatis</groupId>
   <artifactId>mybatis</artifactId>
   <version>${mybatis.version}</version>
  </dependency>
  <!-- 添加mybatis/spring整合包依赖 -->
  <dependency>
   <groupId>org.mybatis</groupId>
   <artifactId>mybatis-spring</artifactId>
   <version>1.2.2</version>
  </dependency>
  <!-- 添加mysql驱动依赖 -->
  <dependency>
   <groupId>mysql</groupId>
   <artifactId>mysql-connector-java</artifactId>
   <version>${mysql-driver.version}</version>
  </dependency>
  <!-- 添加数据库连接池依赖 -->
  <dependency>
   <groupId>com.alibaba</groupId>
   <artifactId>druid</artifactId>
   <version>1.1.3</version>
  </dependency>
  <!-- 添加fastjson -->
  <dependency>
   <groupId>com.alibaba</groupId>
   <artifactId>fastjson</artifactId>
   <version>1.1.41</version>
  </dependency>
  <!-- 添加日志相关jar包 -->
  <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 -->
  <!-- 映入JSON -->
  <dependency>
   <groupId>org.codehaus.jackson</groupId>
   <artifactId>jackson-mapper-asl</artifactId>
   <version>1.9.13</version>
  </dependency>
  <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-core -->
  <dependency>
   <groupId>com.fasterxml.jackson.core</groupId>
   <artifactId>jackson-core</artifactId>
   <version>2.8.0</version>
  </dependency>
  <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->
  <dependency>
   <groupId>com.fasterxml.jackson.core</groupId>
   <artifactId>jackson-databind</artifactId>
   <version>2.8.0</version>
  </dependency>
  <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.aspectj</groupId>
   <artifactId>aspectjweaver</artifactId>
   <version>1.8.10</version>
  </dependency>
 </dependencies>
 <build>
  <finalName>ssm</finalName>
 </build>
</project>

db.properties

db.Driver=com.mysql.jdbc.Driver
db.Url=jdbc:mysql://localhost:3306/myuser?useUnicode=true&characterEncoding=utf-8&zeroDateTimeBehavior=convertToNull 
db.username=root
db.password=xxxxxxxxxxxxx
#定义初始连接数
db.initialSize=1 
#定义最大连接数
db.maxActive=20 
#定义最大空闲
db.maxIdle=20 
#定义最小空闲
db.minIdle=1 
#定义最长等待时间
db.maxWait=60000
#使用非公平锁
db.useUnfairLock=true
#配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒
db.timeBetweenEvictionRunsMillis=60000
#配置一个连接在池中最小生存的时间，单位是毫秒
db.minEvictableIdleTimeMillis=300000
db.validationQuery=SELECT 'x'
#申请连接的时候检测，如果空闲时间大于timeBetweenEvictionRunsMillis，执行validationQuery检测连接是否有效。
db.testWhileIdle=true
#申请连接时执行validationQuery检测连接是否有效
db.testOnBorrow=false
#归还连接时执行validationQuery检测连接是否有效
db.testOnReturn=false
#打开PSCache，并且指定每个连接上PSCache的大小
db.poolPreparedStatements=true
db.maxOpenPreparedStatements=20
#配置监控统计拦截的filters，去掉后监控界面sql无法统计
db.filters=start

log4j.properties

log4j.rootLogger=DEBUG,CONSOLE,FILEOUT 
log4j.addivity.org.apache=true 
# CONSOLE 打印到控制台
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender 
log4j.appender.Threshold=DEBUG 
log4j.appender.CONSOLE.Target=System.out 
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout 
log4j.appender.CONSOLE.layout.ConversionPattern=[%-5p] %d{yyyy-MM-dd HH\:mm\:ss} \:%m%n 
#
# FILEOUT 打印到 <span style="font-family: Arial, Helvetica, sans-serif;">D\:\\report.log</span>
log4j.appender.FILEOUT=org.apache.log4j.RollingFileAppender 
log4j.appender.FILEOUT.File=D\:\\report.log 
log4j.appender.FILEOUT.layout=org.apache.log4j.PatternLayout 
log4j.appender.fileout.MaxFileSize=100000KB 
log4j.appender.FILEOUT.Append=true 
#log4j.appender.CONSOLE.layout.ConversionPattern=[framework] %d \u2013 %c -%-4r [%t] %-5p %c %x \u2013 %m%n
log4j.appender.FILEOUT.layout.ConversionPattern=[%-5p]_%d{yyyy-MM-dd HH\:mm\:ss} \:%m%n

UserMapper.xml配置

<?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.ssm.dao.UserDao">
 <resultMap type="com.ssm.pojo.User" id="User">
  <id column="id" property="id"/>
  <result column="username" property="username" />
  <result column="password" property="password"/>
 </resultMap>
 <select id="seleceUserById" parameterType="int" resultMap="User">
  select * from t_user WHERE id=#{id}
 </select>
</mapper>

sp-mybatis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">
 <!--扫描数据库配置文件-->
 <context:property-placeholder location="classpath:db.properties"></context:property-placeholder>
 <!-- 第二种方式：加载多个properties文件
 <bean id="configProperties" class="org.springframework.beans.factory.config.PropertiesFactoryBean">
  <property name="locations">
   <list>
    <value>classpath:jdbc.properties</value>
    <value>classpath:common.properties</value>
   </list>
  </property>
  <property name="fileEncoding" value="UTF-8"/>
 </bean>
 <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PreferencesPlaceholderConfigurer">
  <property name="properties" ref="configProperties"/>
 </bean>
 -->
 <!--Druid配置数据源-->
 <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
  <property name="driverClassName" value="${db.Driver}"></property>
  <property name="url" value="${db.Url}"></property>
  <property name="username" value="${db.username}"></property>
  <property name="password" value="${db.password}"></property>
  <property name="initialSize" value="${db.initialSize}"/><!-- 配置初始化连接池数量-->
  <property name="minIdle" value="${db.minIdle}"/><!-- 配置最小连接池数量-->
  <property name="maxActive" value="${db.maxActive}"/><!-- 配置最大连接池数量-->
  <property name="maxWait" value="${db.maxWait}"/><!-- 配置获取连接等待超时的时间 单位毫秒-->
  <property name="useUnfairLock" value="${db.useUnfairLock}"/><!--使用非公平锁-->
  <property name="timeBetweenEvictionRunsMillis"
     value="${db.timeBetweenEvictionRunsMillis}"/><!-- 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒 -->
  <property name="minEvictableIdleTimeMillis"
     value="${db.minEvictableIdleTimeMillis}"/><!-- 配置一个连接在池中最小生存的时间，单位是毫秒 -->
  <property name="validationQuery" value="${db.validationQuery}"/><!--用来检测连接是否有效的sql，要求是一个查询语句。-->
  <property name="testWhileIdle"
     value="${db.testWhileIdle}"/><!--申请连接的时候检测，如果空闲时间大于timeBetweenEvictionRunsMillis，执行validationQuery检测连接是否有效。-->
  <property name="testOnBorrow" value="${db.testOnBorrow}"/><!--申请连接时执行validationQuery检测连接是否有效，-->
  <property name="testOnReturn" value="${db.testOnReturn}"/><!--归还连接时执行validationQuery检测连接是否有效，-->
  <property name="poolPreparedStatements"
     value="${db.poolPreparedStatements}"/><!-- 打开PSCache，并且指定每个连接上PSCache的大小 -->
  <property name="maxOpenPreparedStatements" value="${db.maxOpenPreparedStatements}"/>
  <property name="filters" value="${db.filters}"/><!-- 配置监控统计拦截的filters，去掉后监控界面sql无法统计 -->
 </bean>
 <!-- mybatis和spring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"></property>
  <property name="mapperLocations" value="classpath:mapper/*.xml"></property>
 </bean>
 <!-- DAO接口所在包名，Spring会自动查找其下的类 -->
 <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
  <property name="basePackage" value="com.ssm.dao"/>
  <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
 </bean>
</beans>

sp-service.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: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">
 <context:component-scan base-package="com.ssm.service">
 </context:component-scan>
</beans>

sp-trans.xml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:tx="http://www.springframework.org/schema/tx"
  xmlns:aop="http://www.springframework.org/schema/aop"
  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/aop http://www.springframework.org/schema/aop/spring-aop.xsd">
 <!-- 配置事务管理器 -->
 <bean id="transactionManager"
   class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
  <property name="dataSource" ref="dataSource" />
 </bean>
 <!-- 注解方式配置事务 -->
 <tx:annotation-driven transaction-manager="transactionManager" />
 <!-- 拦截器方式配置事物 -->
 <tx:advice id="transactionAdvice" transaction-manager="transactionManager">
  <tx:attributes>
   <!--REQUIRED支持当前存在的事务，如果没有的话句创建一个新的事务
    PROPAGATION_REQUIRED：支持当前事务，如果当前没有事务，就新建一个事务。这是最常见的选择。
    SUPPORTS：支持当前事务，如果当前没有事务，就以非事务方式执行。
    MANDATORY：支持当前事务，如果当前没有事务，就抛出异常。
    REQUIRES_NEW：新建事务，如果当前存在事务，把当前事务挂起。
    NOT_SUPPORTED：以非事务方式执行操作，如果当前存在事务，就把当前事务挂起。
    NEVER：以非事务方式执行，如果当前存在事务，则抛出异常。
    NESTED：支持当前事务，如果当前事务存在，则执行一个嵌套事务（还不是太明白），如果当前没有事务，就新建一个事务。
    -->
   <tx:method name="add*" propagation="REQUIRED" />
   <tx:method name="append*" propagation="REQUIRED" />
   <tx:method name="insert*" propagation="REQUIRED" />
   <tx:method name="save*" propagation="REQUIRED" />
   <tx:method name="update*" propagation="REQUIRED" />
   <tx:method name="modify*" propagation="REQUIRED" />
   <tx:method name="edit*" propagation="REQUIRED" />
   <tx:method name="delete*" propagation="REQUIRED" />
   <tx:method name="remove*" propagation="REQUIRED" />
   <tx:method name="repair" propagation="REQUIRED" />
   <tx:method name="delAndRepair" propagation="REQUIRED" />
   <tx:method name="get*" propagation="SUPPORTS" />
   <tx:method name="find*" propagation="SUPPORTS" />
   <tx:method name="load*" propagation="SUPPORTS" />
   <tx:method name="search*" propagation="SUPPORTS" />
   <tx:method name="datagrid*" propagation="SUPPORTS" />
   <tx:method name="*" propagation="SUPPORTS" />
  </tx:attributes>
 </tx:advice>
 <aop:config>
  <aop:pointcut id="transactionPointcut" expression="execution(* com.ssm.service..*.*(..))" />
  <aop:advisor pointcut-ref="transactionPointcut"
      advice-ref="transactionAdvice" />
 </aop:config>
 <!-- 配置druid监控spring jdbc -->
 <bean id="druid-stat-interceptor"
   class="com.alibaba.druid.support.spring.stat.DruidStatInterceptor">
 </bean>
 <bean id="druid-stat-pointcut" class="org.springframework.aop.support.JdkRegexpMethodPointcut"
   scope="prototype">
  <property name="patterns">
   <list>
    <value>com.ssm.service.*</value>
   </list>
  </property>
 </bean>
 <aop:config>
  <aop:advisor advice-ref="druid-stat-interceptor" pointcut-ref="druid-stat-pointcut" />
 </aop:config>
</beans>

Springmvc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"
  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.xsd">
 <!--扫描controller-->
 <context:component-scan base-package="com.ssm.controller"></context:component-scan>
 <!--mvc驱动-->
 <mvc:annotation-driven></mvc:annotation-driven>
 <!--视图解析器-->
 <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
  <property name="prefix" value="/WEB-INF/jsps"></property>
  <property name="suffix" value=".jsp"></property>
 </bean>
 <!-- 文件上传配置 -->
 <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
  <!-- 默认编码 -->
  <property name="defaultEncoding" value="UTF-8"/>
  <!-- 上传文件大小限制为31M，31*1024*1024 -->
  <property name="maxUploadSize" value="32505856"/>
  <!-- 内存中的最大值 -->
  <property name="maxInMemorySize" value="4096"/>
 </bean>
</beans>

web.xml配置

<!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>log4jConfigLocation</param-name>
  <param-value>classpath:log4j.properties</param-value>
 </context-param>
 <context-param>
  <param-name>contextConfigLocation</param-name>
  <param-value>classpath:spring/sp-*.xml</param-value>
 </context-param>
 <!-- 编码过滤器 -->
 <filter>
  <filter-name>encodingFilter</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>encodingFilter</filter-name>
  <url-pattern>/*</url-pattern>
 </filter-mapping>
 <!--Spring溢出监听器
 <listener>
  <listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class>
 </listener>-->
 <!--Spring监听器-->
 <listener>
  <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
 </listener>
 <!--配置Servlet-->
 <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:spring/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>
 <!--session配置-->
 <session-config>
  <session-timeout>15</session-timeout>
 </session-config>
</web-app>

然后基本框架已经配置好了，剩下的就是写java代码了

Controller

package com.ssm.controller;
import com.ssm.pojo.User;
import com.ssm.service.UserService;
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;
import javax.annotation.Resource;
/**
 * @author: hsj
 * @Date: 2017/9/15
 * @Description :
 */
@Controller
@RequestMapping(value = "/user")
public class UserController {
 @Resource
 private UserService userService;
 @RequestMapping(value = "user")
 @ResponseBody
 public User getUser(int userId){
  return userService.findUserById(userId);
 }
}

Service

package com.ssm.service;
import com.ssm.pojo.User;
import org.springframework.stereotype.Service;
/**
 * @author: hsj
 * @Date: 2017/9/15
 * @Description :
 */
public interface UserService {
 User findUserById(int userId);
}

ServiceImpl

package com.ssm.service.impl;
import com.ssm.dao.UserDao;
import com.ssm.pojo.User;
import com.ssm.service.UserService;
import org.springframework.stereotype.Service;
import javax.annotation.Resource;
/**
 * @author: hsj
 * @Date: 2017/9/15
 * @Description :
 */
@Service
public class UserServiceImpl implements UserService {
 @Resource
 private UserDao userDao;
 public User findUserById(int userId) {
  return userDao.seleceUserById(userId);
 }
}

pojo

package com.ssm.pojo;
/**
 * @author: hsj
 * @Date: 2017/9/18
 * @Description :这是一个User实体类
 */
public class User {
 private int id;
 private String username;
 private String password;
 public int getId() {
  return id;
 }
 public void setId(int 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;
 }
 @Override
 public String toString() {
  return "User{" +
    "id=" + id +
    ", username='" + username + '\'' +
    ", password='" + password + '\'' +
    '}';
 }
}

dao

package com.ssm.dao;
import com.ssm.pojo.User;
import org.springframework.stereotype.Repository;
/**
 * @author: hsj
 * @Date: 2017/9/15
 * @Description :
 */
@Repository
public interface UserDao {
 User seleceUserById(int userId);
}

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