好好想了想，还是准备给大家发一个简单的SSM的项目搭建教程。

我觉得通常来说，只是XML的配置文件可能让人头痛了点，其他的倒真不是问题。

不过话说回来，mybatis一直让我觉得用起来不方便。因为数据库只要修改了字段，那么mapper.xml中的所有sql语句基本都要改。

这是多吓人的工作量啊。。。（大家别说数据库定下来就不太会改变。前期随着需求的改变，数据库相应变化必不可少。我又不是DDD模式。）

废话说了这么多，开始教程了

我使用的IDEA作为IDE

记得是 Maven Project

SSM 项目搭建（IDEA）
一创建 Maven Project
二配置Pom.xml
三创建数据库
四搭建SSM分层结构
五添加xml配置文件
六搭建功能和测试

最后运行一下页面就可以了。
http://localhost:8080/testssm/test/test.do

groupId : testSSM

artifactId: testSSM

二配置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/maven-v4_0_0.xsd">

  <modelVersion>4.0.0</modelVersion>
  <packaging>war</packaging>

  <name>testSSM</name>
  <groupId>testSSM</groupId>
  <artifactId>testSSM</artifactId>
  <version>1.0-SNAPSHOT</version>

  <build>
    <plugins>
      <plugin>
        <groupId>org.mortbay.jetty</groupId>
        <artifactId>maven-jetty-plugin</artifactId>
        <version>6.1.7</version>
        <configuration>
          <connectors>
            <connector implementation="org.mortbay.jetty.nio.SelectChannelConnector">
              <port>8888</port>
              <maxIdleTime>30000</maxIdleTime>
            </connector>
          </connectors>
          <webAppSourceDirectory>${project.build.directory}/${pom.artifactId}-${pom.version}</webAppSourceDirectory>
          <contextPath>/</contextPath>
        </configuration>
      </plugin>
    </plugins>
  </build>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>

    <!-- spring版本号 -->
    <spring.version>4.2.5.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>
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>1.0.16</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>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context-support</artifactId>
      <version>${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>commons-dbcp</groupId>
      <artifactId>commons-dbcp</artifactId>
      <version>1.2.2</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>
  </dependencies>

</project>

三创建数据库

创建表

CREATE TABLE `tb_user` (
  `UserID` int(11) NOT NULL AUTO_INCREMENT,
  `UserName` varchar(255) DEFAULT NULL,
  `RealName` varchar(255) DEFAULT NULL,
  `Password` varchar(255) DEFAULT NULL,
  `IsLock` int(11) DEFAULT NULL,
  `CreateTime` datetime DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (`UserID`),
  UNIQUE KEY `id` (`UserName`)
) ENGINE=InnoDB AUTO_INCREMENT=9 DEFAULT CHARSET=utf8;

新增数据

四搭建SSM分层结构

注意，创建完上面5个包后，需要进行如下操作：

选择java，然后点击Sources，java文件夹会变蓝。

同样，选择resources，然后点击 Resources， resources会出现黄色横杠。

五添加xml配置文件

先看一下配置文件

1 web.xml

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

  <display-name>testSSM</display-name>

  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:spring-mybatis.xml</param-value>
  </context-param>

  <context-param>
    <param-name>log4jConfigLocation</param-name>
    <param-value>classpath:log4j.properties</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监听器 -->
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>

  <!-- 防止spring内存溢出监听器，比如quartz -->
  <listener>
    <listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class>
  </listener>


  <!-- spring mvc servlet-->
  <servlet>
    <servlet-name>testSSM</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>testSSM</servlet-name>
    <!-- 此处也可以配置成 *.do 形式 -->
    <url-pattern>/</url-pattern>
  </servlet-mapping>

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

  <!-- session配置 -->
  <session-config>
    <session-timeout>15</session-timeout>
  </session-config>

</web-app>

2 jdbc.properties

#driverClasss=com.mysql.jdbc.Driver
jdbcUrl=jdbc:mysql://xxx.xxx.xxx.xxx:3306/testdb
#?useUnicode=true&characterEncoding=UTF-8&autoReconnect=true&autoReconnectForPools=true&noAccessToProcedureBodies=true
username=root
password=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

3 log4j.properties

log4j.rootLogger=INFO,Console,File  

#控制台日志
log4j.appender.Console=org.apache.log4j.ConsoleAppender  
log4j.appender.Console.Target=System.out  
log4j.appender.Console.layout=org.apache.log4j.PatternLayout  
log4j.appender.Console.layout.ConversionPattern=[%p][%t][%d{yyyy-MM-dd HH:mm:ss}][%C] - %m%n  

#普通文件日志
log4j.appender.File=org.apache.log4j.RollingFileAppender  
log4j.appender.File.File=logs/ssm.log  
log4j.appender.File.MaxFileSize=10MB  
#输出日志，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][%t][%d{yyyy-MM-dd HH:mm:ss}][%C] - %m%n

4 mybatisConfig.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <settings>
        <!-- <setting name="logImpl" value="LOG4J"/>   -->
        <!-- <setting name="cacheEnabled" value="true"/>
        <setting name="lazyLoadingEnabled" value="true"/>
        <setting name="multipleResultSetsEnabled" value="true"/>
        <setting name="useColumnLabel" value="true"/>
        <setting name="useGeneratedKeys" value="false"/>
        <setting name="defaultExecutorType" value="SIMPLE"/>
        <setting name="defaultStatementTimeout" value="25000"/> -->
        <setting name="logImpl" value="SLF4J"/>
        <setting name="callSettersOnNulls" value="true"/>
        <!--<setting name="autoMappingBehavior" value="true"/>-->
    </settings>

</configuration>

5 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-4.0.xsd
                        http://www.springframework.org/schema/context
                        http://www.springframework.org/schema/context/spring-context-4.0.xsd
                        http://www.springframework.org/schema/mvc
                        http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">

    <!-- 自动扫描  @Controller-->
    <context:component-scan base-package="controller"/>

    <!--避免IE执行AJAX时，返回JSON出现下载文件 -->
    <bean 
          class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
        <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">
        <property name="prefix" value="/WEB-INF/" />
        <property name="suffix" value=".jsp"/>
    </bean>

    <!-- 文件上传配置 -->
    <bean >
        <!-- 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>

6 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: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-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/tx
                        http://www.springframework.org/schema/tx/spring-tx.xsd">

    <!-- 自动扫描 -->
    <context:component-scan base-package="controller"/>

    <!-- 第一种方式：加载一个properties文件 -->
    <bean >
        <property name="location" value="classpath:jdbc.properties"/>
    </bean>


    <!-- 第二种方式：加载多个properties文件
    <bean >
        <property name="locations">
            <list>
                <value>classpath:jdbc.properties</value>
                <value>classpath:common.properties</value>
            </list>
        </property>
        <property name="fileEncoding" value="UTF-8"/>
    </bean>
    <bean >
        <property name="properties" ref="configProperties"/>
    </bean>
    -->

    <!-- 配置数据源 -->
    <bean 
          destroy-method="close">
        <!--<property name="driverClassName" value="${driverClasss}"/>-->
        <property name="url" value="${jdbcUrl}"/>
        <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>

    <!-- mybatis和spring完美整合，不需要mybatis的配置映射文件 -->
    <bean >
        <property name="dataSource" ref="dataSource"/>
        <property name="configLocation">
            <value>classpath:mybatisConfig.xml</value>
        </property>
        <!-- 自动扫描mapping.xml文件 -->
        <property name="mapperLocations" value="classpath:mapping/*.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="dao"/>
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
    </bean>


    <!-- (事务管理)transaction manager, use JtaTransactionManager for global tx -->
    <bean >
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <!-- (事务管理)transaction manager, use JtaTransactionManager for global tx -->
    <tx:annotation-driven transaction-manager="transactionManager"/>
</beans>

六搭建功能和测试

1 UserMapper.xml （位于resources/mapping文件夹下）

<?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="dao.UserMapper" >
    <resultMap  >
        <id column="UserID" property="userid" jdbcType="INTEGER" />
        <result column="UserName" property="username" jdbcType="VARCHAR" />
        <result column="RealName" property="realname" jdbcType="VARCHAR" />
        <result column="Password" property="password" jdbcType="VARCHAR" />
        <result column="IsLock" property="islock" jdbcType="INTEGER" />
        <result column="CreateTime" property="createtime" jdbcType="TIMESTAMP" />
    </resultMap>
    <sql  >
        UserID, UserName, RealName, Password, IsLock, CreateTime
    </sql>
    <select  >
        select
        <include ref />
        from tb_user
        where UserID = #{userid,jdbcType=INTEGER}
    </select>
    <delete  >
        delete from tb_user
        where UserID = #{userid,jdbcType=INTEGER}
    </delete>
    <insert  >
        insert into tb_user (UserID, UserName, RealName,
        Password, IsLock, CreateTime
        )
        values (#{userid,jdbcType=INTEGER}, #{username,jdbcType=VARCHAR}, #{realname,jdbcType=VARCHAR},
        #{password,jdbcType=VARCHAR}, #{islock,jdbcType=INTEGER}, #{createtime,jdbcType=TIMESTAMP}
        )
    </insert>
    <insert  >
        insert into tb_user
        <trim prefix="(" suffix=")" suffixOverrides="," >
            <if test="userid != null" >
                UserID,
            </if>
            <if test="username != null" >
                UserName,
            </if>
            <if test="realname != null" >
                RealName,
            </if>
            <if test="password != null" >
                Password,
            </if>
            <if test="islock != null" >
                IsLock,
            </if>
            <if test="createtime != null" >
                CreateTime,
            </if>
        </trim>
        <trim prefix="values (" suffix=")" suffixOverrides="," >
            <if test="userid != null" >
                #{userid,jdbcType=INTEGER},
            </if>
            <if test="username != null" >
                #{username,jdbcType=VARCHAR},
            </if>
            <if test="realname != null" >
                #{realname,jdbcType=VARCHAR},
            </if>
            <if test="password != null" >
                #{password,jdbcType=VARCHAR},
            </if>
            <if test="islock != null" >
                #{islock,jdbcType=INTEGER},
            </if>
            <if test="createtime != null" >
                #{createtime,jdbcType=TIMESTAMP},
            </if>
        </trim>
    </insert>
    <update  >
        update tb_user
        <set >
            <if test="username != null" >
                UserName = #{username,jdbcType=VARCHAR},
            </if>
            <if test="realname != null" >
                RealName = #{realname,jdbcType=VARCHAR},
            </if>
            <if test="password != null" >
                Password = #{password,jdbcType=VARCHAR},
            </if>
            <if test="islock != null" >
                IsLock = #{islock,jdbcType=INTEGER},
            </if>
            <if test="createtime != null" >
                CreateTime = #{createtime,jdbcType=TIMESTAMP},
            </if>
        </set>
        where UserID = #{userid,jdbcType=INTEGER}
    </update>
    <update  >
        update tb_user
        set UserName = #{username,jdbcType=VARCHAR},
        RealName = #{realname,jdbcType=VARCHAR},
        Password = #{password,jdbcType=VARCHAR},
        IsLock = #{islock,jdbcType=INTEGER},
        CreateTime = #{createtime,jdbcType=TIMESTAMP}
        where UserID = #{userid,jdbcType=INTEGER}
    </update>
</mapper>

2 User对象（model）

package model;

import java.util.Date;

public class User {
    private Integer userid;

    private String username;

    private String realname;

    private String password;

    private Integer islock;

    private Date createtime;

    public Integer getUserid() {
        return userid;
    }

    public void setUserid(Integer userid) {
        this.userid = userid;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username == null ? null : username.trim();
    }

    public String getRealname() {
        return realname;
    }

    public void setRealname(String realname) {
        this.realname = realname == null ? null : realname.trim();
    }

    public String getPassword() {
        return password;
    }

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

    public Integer getIslock() {
        return islock;
    }

    public void setIslock(Integer islock) {
        this.islock = islock;
    }

    public Date getCreatetime() {
        return createtime;
    }

    public void setCreatetime(Date createtime) {
        this.createtime = createtime;
    }
}

3 dao

package dao;

import model.User;

public interface UserMapper {
    int deleteByPrimaryKey(Integer userid);

    int insert(User record);

    int insertSelective(User record);

    User selectByPrimaryKey(Integer userid);

    int updateByPrimaryKeySelective(User record);

    int updateByPrimaryKey(User record);
}

4 controller

（由于是测试，就不在创建 service和impl层了。直接调用通过就可以了。）

package controller;

import dao.UserMapper;
import model.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.List;

/**
 * Created by Tyler on 2017/6/20.
 */

@Controller
@RequestMapping("test")
public class TestController {

    @Autowired
    protected UserMapper service;

    @RequestMapping(value = "test.do")
    public ModelAndView test1(HttpServletRequest request, HttpServletResponse response, ModelMap mode) throws Exception {
        User u =service.selectByPrimaryKey(1);

        return new ModelAndView("test/test");
    }
}

PS: protected UserMapper service; 如果这句报错，可以无视。运行没关系。

5 创建 page

webapp --> test --> test.jsp

最后运行一下页面就可以了。
http://localhost:8080/testssm/test/test.do

SSM 项目搭建 （IDEA） 一 创建 Maven Project 二 配置Pom.xml 三 创建数据库 四 搭建SSM分层结构 五 添加xml配置文件 六 搭建功能和测试 最后运行一下页面就可以了。 http://localhost:8080/testssm/test/test.do

二 配置Pom.xml

三 创建数据库

四 搭建SSM分层结构

五 添加xml配置文件