spring+springmvc+mybatis整合

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spring+springmvc+mybatis整合

1.环境搭建:
eclipse4.x + JDK1.7以上 + Maven，maven仓库用得阿里云镜像。
setting.xml如下配置:

<?xml version="1.0" encoding="UTF-8"?><settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"          xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0 http://maven.apache.org/xsd/settings-1.0.0.xsd">    <!-- 本地仓库地址 -->    <localRepository>D:\DevelopmentTools2/Maven/apache-maven-3.3.9/repository</localRepository>    <pluginGroups>    </pluginGroups>    <proxies>    </proxies>    <servers>    </servers>    <mirrors>        <mirror>              <id>alimaven</id>              <name>aliyun maven</name>              <url>http://maven.aliyun.com/nexus/content/groups/public/</url>              <mirrorOf>central</mirrorOf>                  </mirror>     </mirrors>    <profiles>    </profiles></settings>

2.用maven搭建web项目。图片如下:
这里写图片描述

pom.xml如下：

<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.ssm.web</groupId>  <artifactId>ssm</artifactId>  <packaging>war</packaging>  <version>0.0.1-SNAPSHOT</version>  <name>ssm Maven Webapp</name>  <url>http://maven.apache.org</url>  <properties>    <!-- spring版本号 -->    <spring.version>4.0.2.RELEASE</spring.version>    <!-- mybatis版本号 -->    <mybatis.version>3.2.6</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>${spring.version}</version>    </dependency>    <dependency>      <groupId>org.springframework</groupId>      <artifactId>spring-web</artifactId>      <version>${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>    <!-- mybatis/spring包 -->    <dependency>      <groupId>org.mybatis</groupId>      <artifactId>mybatis-spring</artifactId>      <version>1.2.2</version>    </dependency>    <!-- 导入Java EE jar 包 -->    <dependency>      <groupId>javax</groupId>      <artifactId>javaee-api</artifactId>      <version>7.0</version>    </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applicationContext.xml中配置数据库 -->    <dependency>      <groupId>commons-dbcp</groupId>      <artifactId>commons-dbcp</artifactId>      <version>1.2.2</version>    </dependency>    <!-- JSTL标签类 -->    <dependency>      <groupId>jstl</groupId>      <artifactId>jstl</artifactId>      <version>1.2</version>    </dependency>    <!-- 日志文件管理包 -->    <!-- log start -->    <dependency>      <groupId>log4j</groupId>      <artifactId>log4j</artifactId>      <version>${log4j.version}</version>    </dependency>    <!-- 格式化对象，方便输出日志 -->    <dependency>      <groupId>com.alibaba</groupId>      <artifactId>fastjson</artifactId>      <version>1.1.41</version>    </dependency>    <dependency>      <groupId>org.slf4j</groupId>      <artifactId>slf4j-api</artifactId>      <version>${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>  </dependencies>  <build>    <finalName>ssm</finalName>  </build></project>

3.完成项目基本搭建之后。（将pom.xml里面的包导好）
本人有强迫症，绝不允许项目出现红色警告错误。这里教大家一个小方方法：解决一些蛋疼让人烦躁的红色X
Window–>Show view –>problems
将此视图打开。选择所有的错误右键delete即可。

4.关于maven项目。当我们需要install的时候。养成好习惯之前一定要clean。本人喜欢采用命令执行。类似于clean install，clean install tomcat7:run等。环境问题build path就到这里。下面开始spring和mybatis整合

5.先添加log4j和jdbc配置。jdbc.properties和log4j.properties

jdbc.properties

driver=com.mysql.jdbc.Driverurl=jdbc:mysql://127.0.0.1:3306/ssmusername=rootpassword=root#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

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.ConsoleAppenderlog4j.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.PatternLayoutlog4j.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 = ALLlog4j.appender.File.layout =org.apache.log4j.PatternLayoutlog4j.appender.File.layout.ConversionPattern =[%p] [%d{yyyy-MM-ddHH\:mm\:ss}][%c]%m%n

6.spring和mybatis整合，核心配置文件：spring-mybatis.xml如下:

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:p="http://www.springframework.org/schema/p"   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-3.1.xsd   http://www.springframework.org/schema/context  http://www.springframework.org/schema/context/spring-context-3.1.xsd   http://www.springframework.org/schema/mvc  http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">    <!-- 自动扫描 -->    <context:component-scan base-package="com.ssm" />    <!-- 引入配置文件 -->    <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">        <property name="location" value="classpath:jdbc.properties" />    </bean>    <!-- 数据源 -->    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">        <property name="driverClassName" value="${driver}" />        <property name="url" value="${url}" />        <property name="username" value="${username}" />        <property name="password" value="${password}" />        <!-- 初始化连接大小 -->        <property name="initialSize" value="${initialSize}"></property>        <!-- 连接池最大数量 -->        <property name="maxActive" value="${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="maxWait" value="${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:com/ssm/mappers/*apper.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>    <!-- 事务管理 -->    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">        <property name="dataSource" ref="dataSource" />    </bean></beans>

7.到这里就开始测试spring和mybatis是否整合成功。
用前面楼主讲到的mybatis-generator代码自动生成。生成mapper.xml和dao接口和实体。可以移步到：http://blog.csdn.net/qq_35712358/article/details/70344772
下面直接上代码：

建表SQL：

/*Navicat MySQL Data TransferSource Server         : rootSource Server Version : 50548Source Host           : localhost:3306Source Database       : ssmTarget Server Type    : MYSQLTarget Server Version : 50548File Encoding         : 65001Date: 2017-04-23 16:34:07*/SET FOREIGN_KEY_CHECKS=0;-- ------------------------------ Table structure for user_t-- ----------------------------DROP TABLE IF EXISTS `user_t`;CREATE TABLE `user_t` (  `id` int(11) NOT NULL AUTO_INCREMENT,  `user_name` varchar(40) NOT NULL,  `password` varchar(255) NOT NULL,  `age` int(4) NOT NULL,  PRIMARY KEY (`id`)) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;-- ------------------------------ Records of user_t-- ----------------------------INSERT INTO `user_t` VALUES ('1', '董杨炀', '123456', '24');

UserEntity。关于实体:本人爱好Entity结尾。建议实现序列化接口，重写toString方法。其中自动生成get/set注释。请关注其余文章，有空再教大家。

package com.ssm.domain;import java.io.Serializable;public class UserEntity implements Serializable{    private static final long serialVersionUID = 1L;    private Integer id;    private String userName;    private String password;    private Integer age;    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;    }    public String getPassword() {        return password;    }    public void setPassword(String password) {        this.password = password;    }    public Integer getAge() {        return age;    }    public void setAge(Integer age) {        this.age = age;    }    @Override    public String toString() {        return "UserEntity [id=" + id + ", userName=" + userName + ", password=" + password + ", age=" + age + "]";    }}

UserDao: 接口规范，Dao结尾。实现类Impl结尾

package com.ssm.dao;import org.springframework.stereotype.Repository;import com.ssm.domain.UserEntity;@Repository("userDao")public interface UserDao {    int deleteByPrimaryKey(Integer id);    int insert(UserEntity record);    int insertSelective(UserEntity record);    UserEntity selectByPrimaryKey(Integer id);    int updateByPrimaryKeySelective(UserEntity record);    int updateByPrimaryKey(UserEntity record);}

UserEntityMapper.xml。
关于映射文件：注意namespace，必须是接口所在的全包名类路径

<?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 id="BaseResultMap" type="com.ssm.domain.UserEntity" >    <id column="id" property="id" jdbcType="INTEGER" />    <result column="user_name" property="userName" jdbcType="VARCHAR" />    <result column="password" property="password" jdbcType="VARCHAR" />    <result column="age" property="age" jdbcType="INTEGER" />  </resultMap>  <sql id="Base_Column_List" >    id, user_name, password, age  </sql>  <select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Integer" >    select     <include refid="Base_Column_List" />    from user_t    where id = #{id,jdbcType=INTEGER}  </select>  <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer" >    delete from user_t    where id = #{id,jdbcType=INTEGER}  </delete>  <insert id="insert" parameterType="com.ssm.domain.UserEntity" >    insert into user_t (id, user_name, password,       age)    values (#{id,jdbcType=INTEGER}, #{userName,jdbcType=VARCHAR}, #{password,jdbcType=VARCHAR},       #{age,jdbcType=INTEGER})  </insert>  <insert id="insertSelective" parameterType="com.ssm.domain.UserEntity" >    insert into user_t    <trim prefix="(" suffix=")" suffixOverrides="," >      <if test="id != null" >        id,      </if>      <if test="userName != null" >        user_name,      </if>      <if test="password != null" >        password,      </if>      <if test="age != null" >        age,      </if>    </trim>    <trim prefix="values (" suffix=")" suffixOverrides="," >      <if test="id != null" >        #{id,jdbcType=INTEGER},      </if>      <if test="userName != null" >        #{userName,jdbcType=VARCHAR},      </if>      <if test="password != null" >        #{password,jdbcType=VARCHAR},      </if>      <if test="age != null" >        #{age,jdbcType=INTEGER},      </if>    </trim>  </insert>  <update id="updateByPrimaryKeySelective" parameterType="com.ssm.domain.UserEntity" >    update user_t    <set >      <if test="userName != null" >        user_name = #{userName,jdbcType=VARCHAR},      </if>      <if test="password != null" >        password = #{password,jdbcType=VARCHAR},      </if>      <if test="age != null" >        age = #{age,jdbcType=INTEGER},      </if>    </set>    where id = #{id,jdbcType=INTEGER}  </update>  <update id="updateByPrimaryKey" parameterType="com.ssm.domain.UserEntity" >    update user_t    set user_name = #{userName,jdbcType=VARCHAR},      password = #{password,jdbcType=VARCHAR},      age = #{age,jdbcType=INTEGER}    where id = #{id,jdbcType=INTEGER}  </update></mapper>

Service接口和实现类：

package com.ssm.service;import com.ssm.domain.UserEntity;public interface UserService {    UserEntity getUserById(int userId);}

package com.ssm.service.impl;import javax.annotation.Resource;import org.springframework.stereotype.Service;import com.ssm.dao.UserDao;import com.ssm.domain.UserEntity;import com.ssm.service.UserService;@Service("userService")public class UserServiceImpl implements UserService{    @Resource    private UserDao userDao;    public UserEntity getUserById(int userId) {        return this.userDao.selectByPrimaryKey(userId);    }}

将ServiceImpl生成测试类测试：
UserServiceImplTest

package com.ssm.service.impl;import javax.annotation.Resource;import org.apache.log4j.Logger;import org.junit.Test;import org.junit.runner.RunWith;import org.springframework.test.context.ContextConfiguration;import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;import com.alibaba.fastjson.JSON;import com.ssm.domain.UserEntity;import com.ssm.service.UserService;@RunWith(SpringJUnit4ClassRunner.class)             //表示继承了SpringJUnit4ClassRunner类@ContextConfiguration(locations = {"classpath:spring-mybatis.xml"})public class UserServiceImplTest {//  private ApplicationContext ac = null;    private static Logger logger = Logger.getLogger(UserServiceImplTest.class);    @Resource    private UserService userService;//  @Before//  public void before() {//      ac= new ClassPathXmlApplicationContext("spring-mybatis.xml");//      userService= (UserService) ac.getBean("userService");//  }    @Test    public void getUserById() {        UserEntity user = userService.getUserById(1);        logger.info(JSON.toJSONString(user));    }}

做到这里运行Test方法。执行绿色通过。表示已经spring整合mybatis成功了。如图：
这里写图片描述

本人运行调试程序喜欢设置2个快捷键。
这里写图片描述
其中建议取消一个快捷键ctrl+b。跟复制粘贴太近。手快的同志容易失手。maven项目一但很大。这个动作就比较耗时。影响开发体验。

8.spring整合springmvc。核心配置文件spring-mvc.xml，web.xml

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:p="http://www.springframework.org/schema/p"  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-3.1.xsd  http://www.springframework.org/schema/context  http://www.springframework.org/schema/context/spring-context-3.1.xsd  http://www.springframework.org/schema/mvc  http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">  <!-- 自动扫描该包，使SpringMVC认为包下用了@controller注解的类是控制器 -->  <context:component-scan base-package="com.ssm.web.controller" />  <!--避免IE执行AJAX时，返回JSON出现下载文件 -->  <bean id="mappingJacksonHttpMessageConverter" class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">    <property name="supportedMediaTypes">      <list>        <value>text/html;charset=UTF-8</value>      </list>    </property>  </bean>  <!-- 启动SpringMVC的注解功能，完成请求和注解POJO的映射 -->  <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">    <property name="messageConverters">      <list>        <ref bean="mappingJacksonHttpMessageConverter" />     <!-- JSON转换器 -->      </list>    </property>  </bean>  <!-- 定义跳转的文件的前后缀，视图模式配置-->  <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">    <!-- 这里的配置我的理解是自动给后面action的方法return的字符串加上前缀和后缀，变成一个可用的url地址 -->    <property name="prefix" value="/WEB-INF/jsp/" />    <property name="suffix" value=".jsp" />  </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="10485760000" />         <!-- 内存中的最大值 -->        <property name="maxInMemorySize" value="40960" />    </bean></beans>

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/javaeehttp://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"  version="3.0">  <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>  <!-- 编码过滤器 -->  <filter>    <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>  <!-- 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>  <!-- Spring MVC 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-mvc.xml</param-value>    </init-param>    <load-on-startup>1</load-on-startup>    <async-supported>true</async-supported>  </servlet>  <servlet-mapping>    <servlet-name>SpringMVC</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>  <welcome-file-list>    <welcome-file>/index.jsp</welcome-file>  </welcome-file-list></web-app>

编写控制器，添加jsp
UserController

package com.ssm.web.controller;import javax.annotation.Resource;import javax.servlet.http.HttpServletRequest;import org.springframework.stereotype.Controller;import org.springframework.ui.Model;import org.springframework.web.bind.annotation.RequestMapping;import com.ssm.domain.UserEntity;import com.ssm.service.UserService;@Controller@RequestMapping("/user")public class UserController {    @Resource    private UserService userService;    @RequestMapping("/showUser")    public String toIndex(HttpServletRequest request,Model model){        int userId = Integer.parseInt(request.getParameter("id"));        UserEntity user = this.userService.getUserById(userId);        model.addAttribute("user", user);        return "showUser";    }}

showUser.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01Transitional//EN"><html>  <head>  <title>测试</title>  </head>  <body>    ${user.userName}  </body></html>

9.到这里完成配置之后。你就可以部署了。启动如下：
这里写图片描述

10.验证访问http://localhost:8080/ssm/user/showUser?id=1
如下图：
这里写图片描述

11.恭喜你，以上都成功了。

12.可能会有各种环境不一问题导致启动会有BUG.比如楼主在自己笔记本启动一次到位.maven不存在jar包冲突,在公司就会出现冲突.

maven项目你还需要右键properties.设置如下图:
这里写图片描述

常见问题:java.lang.NoClassDefFoundError和java.lang.ClassNotFoundException

碰见这种异常太简单.
1.首先确认jar包是否成功导入?
2.如果导入了还报,99%就是jar冲突

解决方案:点开POM文件如下图:
这里写图片描述

搜索包,看有几处引用.楼主这里已经解决了冲突,如上图.不然会显示2处spring-web.
spring-webmvc依赖了web

第一种:不导spring-web,spring-webmvc有依赖.
第二种:在导spring-webmvc时排除依赖spring-web

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