idea整合maven+ssm

项目结构：

学习如何利用idea创建+maven项目，并整合springmvc+spring+mybatis

第一步创建maven项目：File-->new-->project-->maven-->选择jdk,并create from archetype

2.点击next,进入下一窗口，输出组织名称和项目名称

3.点击next,进入下一窗口，配置maven

4.点击next，进入下一窗口，直接点击finish,创建maven项目创建成功

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5.创建好maven项目，点击右上角标红位置，配置web,创建web.xml

点击modules-->点击+-->选择web -->生成web,web右界面的配置保持默认就好

6.默认产生的项目中，src目录下创建main和test (如果有不用创建)，然后在main/test目录下分别创建java和resources文件夹

java目录下存放我们写的java代码，resources目录下放我们需要的配置文件

有两种途径，可以将自己创建的目录配置成我们项目中的默认存放路径：

（1）点击右上角的文件夹形式的小图标，在上面第5步图片中的图标，进入project structure界面

modules-->项目名称-->点击要配置的文件夹选择下图对应图标

（2）右击要配置的文件夹-->mark directory as -->选择对应形式

至此项目的结构整体搭建起来了，下面开始整合spring+springmvc+mybatis

这里利用的generator，数据库成功创建表之后，利用此工具产生实体类和mapper.xml文件

在src目录下创建db和generator文件夹，db文件夹下放我们创建数据的脚本文件：create-table.sql

DROP TABLE IF EXISTS t_user;
CREATE TABLE t_user (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `user_name` varchar(40) NOT NULL,
  `password` varchar(255) NOT NULL,
  `role` int(4) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

INSERT INTO t_user VALUES ('1', '测试', '123456', '21');
INSERT INTO t_user VALUES ('2', 'admin', '1qaz1qaz', '1');

generator文件夹下放需要的相关jar包

利用alt+F12打开idea自带的cmd界面，

输入：java -jar mybatis-generator-core-1.3.6.jar -configfile generatorConfig.xml –overwrite

创建出实体类，mapper.xml文件

resources下的四个配置文件：jdbc.properties

driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/devdb?characterEncoding=utf-8
user=root
password=123456
#定义初始连接数
initialSize=0
#定义最大连接数
maxActive=20
#定义最大空闲
maxIdle=20
#定义最小空闲
minIdle=1
#定义最长等待时间
maxWait=60000

log.properties

#日志根目录
log4j.rootLogger=debug,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, 这里指定变量后，不随启动位置变化
log4j.appender.File.File=${catalina.home}/log/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

spring-mvc.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:aop="http://www.springframework.org/schema/aop"
               xmlns:mvc="http://www.springframework.org/schema/mvc"
               xmlns:context="http://www.springframework.org/schema/context"
               xmlns:tx="http://www.springframework.org/schema/tx" xmlns:MVC="http://www.springframework.org/schema/mvc"
               xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans-4.1.xsd
        http://www.springframework.org/schema/tx
        http://www.springframework.org/schema/tx/spring-tx-4.1.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop-4.1.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-4.1.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd">
<!-- 配置映射器和适配器 -->
<mvc:annotation-driven/>
<!-- 配置视图解析器 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="prefix" value="/WEB-INF/jsp/"/>
    <property name="suffix" value=".jsp"/>
</bean>
    <!-- 配置包扫描，控制层 -->
<context:component-scan base-package="com.study.controller"/>
    <!-- 配置静态资源位置 -->
<mvc:resources mapping="/css/**" location="/WEB-INF/css/"/>
<mvc:resources mapping="/js/**" location="/WEB-INF/js/"/>
<!-- 静态资源可以访问的方式 -->
<MVC:default-servlet-handler/>
<bean id="mappingJacksonHttpMessageConverter" class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
    <property name="supportedMediaTypes">
        <list>
            <value>text/html;charset=UTF-8</value>
        </list>
    </property>
</bean>
    <!-- 对象映射器 -->
<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
    <property name="messageConverters">
        <list>
            <ref bean="mappingJacksonHttpMessageConverter"/>
        </list>
    </property>
</bean>
    <!-- 文件上传下载设置 -->
<bean id="multipartResolver"  class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
    <property name="defaultEncoding" value="UTF-8"/>
    <property name="maxUploadSize" value="10485760000"/>
    <property name="maxInMemorySize" value="40960"/>
    <property name="resolveLazily" value="true"/>
</bean>
<!-- 配置ViewResolver 。可用多个ViewResolver 。使用order属性排序。   InternalResourceViewResolver 放在最后-->
<bean
        class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
    <property name="viewResolvers">
        <list>
            <bean
                    class="org.springframework.web.servlet.view.InternalResourceViewResolver">
                <property name="prefix" value="/WEB-INF/jsp/"></property>
                <property name="suffix" value=".jsp"></property>
            </bean>
        </list>
    </property>
    <property name="defaultViews">
        <list>
            <bean
                    class="org.springframework.web.servlet.view.json.MappingJackson2JsonView">
            </bean>
        </list>
    </property>
</bean>
</beans>

spring-mybatis.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:aop="http://www.springframework.org/schema/aop"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:util="http://www.springframework.org/schema/util"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans-4.1.xsd
        http://www.springframework.org/schema/tx
        http://www.springframework.org/schema/tx/spring-tx-4.1.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop-4.1.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-4.1.xsd">
    <!-- 自动扫描 服务层-->
    <context:component-scan base-package="com.study.service" />
    <!-- 自动扫描 结果集映射-->
    <context:component-scan base-package="com.study.mapper"/>

    <!--2 加载数据资源属性文件 -->
    <context:property-placeholder location="classpath:jdbc.properties"/>
    <!--<bean id="propertyConfigurer"
          class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="location" value="classpath*:jdbc.properties" />
    </bean>-->

    <bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource"
          destroy-method="close">
        <property name="driverClassName" value="${driver}" />
        <property name="url" value="${url}" />
        <property name="username" value="${user}" />
        <property name="password" value="${password}" />
        <!-- 初始化连接大小 -->
        <property name="initialSize" value="${initialSize}"></property>
        <!-- 连接池最大数量 -->
        <property name="maxTotal" value="${maxActive}"></property>
        <!-- 连接池最大空闲 -->
        <property name="maxIdle" value="${maxIdle}"></property>
        <!-- 连接池最小空闲 -->
        <property name="minIdle" value="${minIdle}"></property>
        <!-- 获取连接最大等待时间 -->
        <property name="maxWaitMillis" value="${maxWait}"></property>
    </bean>

    <!-- spring和MyBatis完美整合，不需要mybatis的配置映射文件 -->
    <!-- 配置SqlSessionFactory对象 -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 注入数据库连接池 -->
        <property name="dataSource" ref="dataSource"/>
        <!-- 扫描model包 使用别名 -->
        <property name="typeAliasesPackage" value="com.study.model"/>
        <!-- 扫描sql配置文件:mapper需要的xml文件 -->
        <property name="mapperLocations" value="classpath:com/study/mapper/*.xml"/>
    </bean>

    <!-- 配置扫描Dao接口包，动态实现Dao接口，注入到spring容器中 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!-- 注入sqlSessionFactory -->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
        <!-- 给出需要扫描Dao接口包 -->
        <property name="basePackage" value="com.study.mapper"/>
    </bean>

    <!-- (事务管理)transaction manager, use JtaTransactionManager for global tx -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource" />
    </bean>

    <!-- 配置基于注解的声明式事务 -->
    <tx:annotation-driven transaction-manager="transactionManager"/>
</beans>

webapp下的web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xmlns="http://java.sun.com/xml/ns/javaee"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
         version="3.0"
         metadata-complete="false">

  <display-name>Archetype Created Web Application</display-name>

  <!-- Spring和mybatis的配置文件 -->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath*:spring-mybatis.xml</param-value>
  </context-param>
  <!-- log4j的配置文件 注意不能用* ，因为 log4jConfigLocation 不支持-->
  <!-- <param-value>classpath:/WEB-INF/classes/log.properties</param-value>  -->
  <context-param>
    <param-name>log4jConfigLocation</param-name>
    <param-value>WEB-INF/classes/log.properties</param-value>
  </context-param>

  <!--以下配置的加载顺序:先 ServletContext >> context-param >> listener
   >> filter >> servlet >>  spring-->

  <!-- Spring MVC servlet -->
  <servlet>
    <servlet-name>SsmBase</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath*:spring-mvc.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
    <async-supported>true</async-supported>
  </servlet>
  <servlet-mapping>
    <servlet-name>SsmBase</servlet-name>
    <!-- 此处可以可以配置成*.do，对应struts的后缀习惯 -->
    <url-pattern>/</url-pattern>
  </servlet-mapping>


  <!-- 编码过滤器 -->
  <filter>
    <!-- 用来声明filter的相关设定,过滤器可以截取和修改一个Servlet或JSP页面的请求
    或从一个Servlet或JSP页面发出的响应-->

    <filter-name>EncodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <async-supported>true</async-supported>
    <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>

  <!-- 监听器配置 -->
  <!-- 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>
  <listener>
    <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
  </listener>
  <!--  会话超时配置（单位为分钟）  -->
  <session-config><!--如果某个会话在一定时间未被访问，则服务器可以扔掉以节约内存-->
    <session-timeout>120</session-timeout>
  </session-config>

  <welcome-file-list>
    <welcome-file>/index.jsp</welcome-file>
  </welcome-file-list>
</web-app>

pom.xml

<?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">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.cy</groupId>
  <artifactId>SsmBase</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>war</packaging>

  <name>SsmBase Maven Webapp</name>
  <!-- FIXME change it to the project's website -->
  <url>http://www.example.com</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.7</maven.compiler.source>
    <maven.compiler.target>1.7</maven.compiler.target>
    <!-- spring版本号 -->
    <spring.version>4.1.0.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>
      <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-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>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aop</artifactId>
      <version>${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>${spring.version}</version>
    </dependency>
    <!-- mybatis核心包 -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>${mybatis.version}</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>1.3.2</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/javax/javaee-api -->
    <dependency>
      <groupId>javax</groupId>
      <artifactId>javaee-api</artifactId>
      <version>7.0</version>
      <scope>provided</scope>
    </dependency>

    <!-- 导入Mysql数据库链接jar包 -->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.6</version>
    </dependency>
    <!-- 导入dbcp的jar包，用来在applicationContext.xml中配置数据库 -->
    <!--
   <dependency>
     <groupId>commons-dbcp</groupId>
     <artifactId>commons-dbcp</artifactId>
     <version>1.2.2</version>
   </dependency>
   -->
    <!-- https://mvnrepository.com/artifact/org.apache.commons/commons-dbcp2 -->
    <dependency>
      <groupId>org.apache.commons</groupId>
      <artifactId>commons-dbcp2</artifactId>
      <version>2.1.1</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/jstl/jstl -->
    <!-- https://mvnrepository.com/artifact/jstl/jstl -->
    <dependency>
      <groupId>jstl</groupId>
      <artifactId>jstl</artifactId>
      <version>1.1.2</version>
    </dependency>

    <!-- 日志文件管理包 -->
    <!-- log start -->
    <dependency>
      <groupId>log4j</groupId>
      <artifactId>log4j</artifactId>
      <version>${log4j.version}</version>
    </dependency>


    <!-- https://mvnrepository.com/artifact/com.alibaba/fastjson -->
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>fastjson</artifactId>
      <version>1.2.58</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 -->
    <!-- https://mvnrepository.com/artifact/org.codehaus.jackson/jackson-mapper-asl -->
    <dependency>
      <groupId>org.codehaus.jackson</groupId>
      <artifactId>jackson-mapper-asl</artifactId>
      <version>1.9.2</version>
    </dependency>
    <!-- spring 4.0 增加如下jackson -->
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-core</artifactId>
      <version>2.7.0</version>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>2.7.0</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>
    <!-- https://mvnrepository.com/artifact/commons-codec/commons-codec -->
    <dependency>
      <groupId>commons-codec</groupId>
      <artifactId>commons-codec</artifactId>
      <version>1.10</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.mybatis.generator/mybatis-generator-core -->
    <dependency>
      <groupId>org.mybatis.generator</groupId>
      <artifactId>mybatis-generator-core</artifactId>
      <version>1.3.6</version>
    </dependency>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>3.1.0</version>
    </dependency>
  </dependencies>

  <build>
    <finalName>SsmBase</finalName>
    <resources>
      <!--因为mapper目录下，有xml映射文件 -->
      <resource>
        <directory>src/main/java</directory>
        <includes>
          <include>**/*.xml</include>
        </includes>
      </resource>
      <!--resources 目录 -->
      <!-- 这里的resource配置的是需要导入到项目的资源文件夹 -->
      <resource>
        <directory>src/main/resources</directory>
        <includes>
          <include>**/*.xml</include>
          <include>**/*.properties</include>
        </includes>
      </resource>
    </resources>
    <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
      <plugins>
        <plugin>
          <artifactId>maven-clean-plugin</artifactId>
          <version>3.1.0</version>
        </plugin>
        <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
        <plugin>
          <artifactId>maven-resources-plugin</artifactId>
          <version>3.0.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-compiler-plugin</artifactId>
          <version>3.8.0</version>
        </plugin>
        <plugin>
          <artifactId>maven-surefire-plugin</artifactId>
          <version>2.22.1</version>
        </plugin>
        <plugin>
          <artifactId>maven-war-plugin</artifactId>
          <version>3.2.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-install-plugin</artifactId>
          <version>2.5.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-deploy-plugin</artifactId>
          <version>2.8.2</version>
        </plugin>
      </plugins>
    </pluginManagement>
  </build>
</project>

至此所有的配置文件都已配置完毕

然后补全service-->serviceImpl-->controller层

核实项目的jdk配置

点击右上角的add configuration,小锤子形状的

配置tomcat:

运行tomcat，至此整个项目搭建完成

给出controller,service,serviceImpl,dao层代码如下：

userController

package com.study.controller;

import com.study.model.User;
import com.study.service.UserService;
import org.apache.commons.io.FileUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import javax.annotation.Resource;
import java.io.File;
import java.io.IOException;
import java.util.Map;

@Controller
@RequestMapping("/user")
public class UserController {
    private static Logger logger = LoggerFactory.getLogger(UserController.class);
    @Resource
    private UserService userService;
    @RequestMapping(value = "/{userId}",method = RequestMethod.GET)
    public @ResponseBody User doFindUserById(@PathVariable String userId, Map<String,Object> model){
        int id = Integer.parseInt(userId);
        System.out.println("用户id:"+id);
        User user = this.userService.getUserById(id);
        logger.info(user.toString());
        return user;
    }

    // /user/{id}
    @RequestMapping(value="/jsontype/{id}",method=RequestMethod.GET)
    @ResponseBody
    public ResponseEntity<User>  getUserInJson2(@PathVariable String id,Map<String, Object> model){
        int userId = Integer.parseInt(id);
        System.out.println("userId:"+userId);
        User user = this.userService.getUserById(userId);
        logger.info(user.toString());
        return new ResponseEntity<User>(user, HttpStatus.OK);
    }

    //文件上传、
    @RequestMapping(value="/upload")
    public String showUploadPage(){
        return "user_admin/file";
    }

    @RequestMapping(value="/doUpload",method=RequestMethod.POST)
    public String doUploadFile(@RequestParam("file") MultipartFile file) throws IOException {
        if (!file.isEmpty()) {
            logger.info("Process file:{}",file.getOriginalFilename());
        }
        FileUtils.copyInputStreamToFile(file.getInputStream(), new File("E:\\",System.currentTimeMillis()+file.getOriginalFilename()));
        return "succes";
    }

}

package com.study.model;

public class User {
    private Integer id;

    private String userName;

    private String password;

    private Integer role;

    public User(Integer id, String userName, String password, Integer role) {
        this.id = id;
        this.userName = userName;
        this.password = password;
        this.role = role;
    }

    public User() {
        super();
    }

    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();
    }

    public Integer getRole() {
        return role;
    }

    public void setRole(Integer role) {
        this.role = role;
    }
}

service

package com.study.service;

import com.study.model.User;

public interface UserService {
    public User getUserById(Integer id);
}

serviceImpl

package com.study.service;

import com.study.mapper.UserMapper;
import com.study.model.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;

@Service
public class UserServiceImpl implements UserService {
    @Resource
    private UserMapper userMapper;
    @Override
    public User getUserById(Integer id) {
        return this.userMapper.selectByPrimaryKey(id);
    }
}

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