SSM框架搭建图文教程(推荐)

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" />

<!-- * 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 *
<listener>
 <listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class>
</listener>-->

<!--Spring * -->
<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);
}

来源：http://www.cnblogs.com/bingshu/archive/2017/09/26/7599629.html