利用idea创建一个基本的smm项目（带增删改查）

环境  idea  jdk1.8  tomcat  mysql

打开idea选择创建一个maven项目

然后点击next，next，finsh

然后看项目的结构

如图所示

接着创建com包，再在com包下新建四个包，分别命名为：

自定义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.li</groupId>
 <artifactId>ssm_test_2</artifactId>
 <version>1.0-SNAPSHOT</version>
 <packaging>war</packaging>

 <name>ssm_test_2 Maven Webapp</name>
 <!-- 用来设置版本号 -->
 <properties>
   <srping.version>4.0.2.RELEASE</srping.version>
   <mybatis.version>3.2.8</mybatis.version>
   <slf4j.version>1.7.12</slf4j.version>
   <log4j.version>1.2.17</log4j.version>
   <druid.version>1.0.9</druid.version>
 </properties>
 <!-- 用到的jar包 -->
 <dependencies>
   <!-- servlet依赖的jar包start -->
   <dependency>
     <groupId>javax.servlet</groupId>
     <artifactId>javax.servlet-api</artifactId>
   </dependency>
   <!-- servlet依赖的jar包start -->

   <!-- jsp依赖jar包start -->
   <dependency>
     <groupId>javax.servlet.jsp</groupId>
     <artifactId>javax.servlet.jsp-api</artifactId>
     <version>2.3.1</version>
   </dependency>
   <!-- 单元测试 -->
   <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框架包 -->
   <dependency>
     <groupId>org.springframework</groupId>
     <artifactId>spring-test</artifactId>
     <version>${srping.version}</version>
   </dependency>
   <dependency>
     <groupId>org.springframework</groupId>
     <artifactId>spring-core</artifactId>
     <version>${srping.version}</version>
   </dependency>
   <dependency>
     <groupId>org.springframework</groupId>
     <artifactId>spring-oxm</artifactId>
     <version>${srping.version}</version>
   </dependency>
   <dependency>
     <groupId>org.springframework</groupId>
     <artifactId>spring-tx</artifactId>
     <version>${srping.version}</version>
   </dependency>
   <dependency>
     <groupId>org.springframework</groupId>
     <artifactId>spring-jdbc</artifactId>
     <version>${srping.version}</version>
   </dependency>
   <dependency>
     <groupId>org.springframework</groupId>
     <artifactId>spring-aop</artifactId>
     <version>${srping.version}</version>
   </dependency>
   <dependency>
     <groupId>org.springframework</groupId>
     <artifactId>spring-context</artifactId>
     <version>${srping.version}</version>
   </dependency>
   <dependency>
     <groupId>org.springframework</groupId>
     <artifactId>spring-context-support</artifactId>
     <version>${srping.version}</version>
   </dependency>
   <dependency>
     <groupId>org.springframework</groupId>
     <artifactId>spring-expression</artifactId>
     <version>${srping.version}</version>
   </dependency>
   <dependency>
     <groupId>org.springframework</groupId>
     <artifactId>spring-orm</artifactId>
     <version>${srping.version}</version>
   </dependency>
   <dependency>
     <groupId>org.springframework</groupId>
     <artifactId>spring-web</artifactId>
     <version>${srping.version}</version>
   </dependency>
   <dependency>
     <groupId>org.springframework</groupId>
     <artifactId>spring-webmvc</artifactId>
     <version>${srping.version}</version>
   </dependency>
   <!-- spring框架包 -->
   <!-- mybatis框架包 -->
   <dependency>
     <groupId>org.mybatis</groupId>
     <artifactId>mybatis</artifactId>
     <version>${mybatis.version}</version>
   </dependency>
   <dependency>
     <groupId>org.mybatis</groupId>
     <artifactId>mybatis-spring</artifactId>
     <version>1.2.2</version>
   </dependency>
   <!-- mybatis框架包 -->
   <!-- 数据库驱动 -->
   <dependency>
     <groupId>mysql</groupId>
     <artifactId>mysql-connector-java</artifactId>
     <version>5.1.35</version>
   </dependency>
   <!-- 导入dbcp的jar包，用来在applicationContext.xml中配置数据库 -->
   <dependency>
     <groupId>commons-dbcp</groupId>
     <artifactId>commons-dbcp</artifactId>
     <version>1.2.2</version>
   </dependency>
   <!-- jstl标签类 -->
   <dependency>
     <groupId>jstl</groupId>
     <artifactId>jstl</artifactId>
     <version>1.2</version>
   </dependency>
   <!-- log -->
   <dependency>
     <groupId>log4j</groupId>
     <artifactId>log4j</artifactId>
     <version>${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>
   <!-- 连接池 -->
   <dependency>
     <groupId>com.alibaba</groupId>
     <artifactId>druid</artifactId>
     <version>${druid.version}</version>
   </dependency>
 </dependencies>

 <build>
   <!-- 如果不添加此节点mybatis的mapper.xml文件都会被漏掉。 -->
   <resources>
     <resource>
       <directory>src/main/java</directory>
       <includes>
         <include>**/*.properties</include>
         <include>**/*.xml</include>
       </includes>
       <filtering>false</filtering>
     </resource>
     <resource>
       <directory>src/main/resources</directory>
       <includes>
         <include>**/*.properties</include>
         <include>**/*.xml</include>
       </includes>
       <filtering>false</filtering>
     </resource>
   </resources>
   <!-- java编译插件,如果maven的设置里配置好jdk版本就不用 -->
   <plugins>
     <plugin>
       <groupId>org.apache.maven.plugins</groupId>
       <artifactId>maven-compiler-plugin</artifactId>
       <version>3.2</version>
       <configuration>
         <source>1.8</source>
         <target>1.8</target>
         <encoding>UTF-8</encoding>
       </configuration>
     </plugin>
   </plugins>
 </build>
</project>

在resource包下新建Directory:mapper(用来放xxMapper.xml)

添加jdbc.properties和lo4j.properties文件

jdbc.properties

driver=com.mysql.jdbc.Driver
url=jdbc\:mysql\://localhost\:3306/test
username=root
password=123456

initialSize=0

maxActive=20

maxIdle=20

minIdle=1

maxWait=60000

lo4j.properties文件

log4j.rootLogger=DEBUG,CONSOLE,file
#log4j.rootLogger=ERROR,ROLLING_FILE
log4j.logger.com.qhit.dao=debug
log4j.logger.com.ibatis=debug
log4j.logger.com.ibatis.common.jdbc.SimpleDataSource=debug
log4j.logger.com.ibatis.common.jdbc.ScriptRunner=debug
log4j.logger.com.ibatis.sqlmap.engine.impl.SqlMapClientDelegate=debug
log4j.logger.java.sql.Connection=debug
log4j.logger.java.sql.Statement=debug
log4j.logger.java.sql.PreparedStatement=debug
log4j.logger.java.sql.ResultSet=debug
log4j.logger.org.tuckey.web.filters.urlrewrite.UrlRewriteFilter=debug

######################################################################################
# Console Appender  日志在控制输出配置
######################################################################################
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.Threshold=error
log4j.appender.CONSOLE.Target=System.out
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern= [%p] %d %c - %m%n

######################################################################################
# DailyRolling File  每天产生一个日志文件，文件名格式:log2009-09-11
######################################################################################
log4j.appender.file=org.apache.log4j.DailyRollingFileAppender
log4j.appender.file.DatePattern=yyyy-MM-dd
log4j.appender.file.File=log.log
log4j.appender.file.Append=true
log4j.appender.file.Threshold=error
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{yyyy-M-d HH:mm:ss}%x[%5p](%F:%L) %m%n

log4j.logger.com.opensymphony.xwork2=error  

然后创建applicationContext.xm

<?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:context="http://www.springframework.org/schema/context"
     xsi:schemaLocation="http://www.springframework.org/schema/beans
                       http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
                       http://www.springframework.org/schema/tx
                       http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

  <!-- 加载properties文件 -->
  <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
     <property name="location" value="classpath:jdbc.properties"/>
  </bean>

  <!-- 配置数据源 -->
  <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
     <property name="driverClassName" value="${driver}"/>
     <property name="url" value="${url}"/>
     <property name="username" value="${username}"/>
     <property name="password" value="${password}"/>
  </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"/>
     <!-- 扫描model包 -->
     <property name="typeAliasesPackage" value="com.lwy.pojo"/>
     <!-- 扫描sql配置文件:mapper需要的xml文件-->
     <property name="mapperLocations" value="classpath:mapper/*.xml"/>
  </bean>

  <!-- Mapper动态代理开发，扫描dao接口包-->
  <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.lwy.mapper"/>
  </bean>

  <!-- 事务管理 -->
  <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
     <!--数据库连接池-->
     <property name="dataSource" ref="dataSource"/>
  </bean>
</beans>

创建sping-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: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-3.0.xsd">

  <!-- 扫描注解，这样com.xjt包下的文件都能被扫描 -->
  <context:component-scan base-package="com.lwy"/>

  <!-- 开启SpringMVC注解模式 -->
  <mvc:annotation-driven/>

  <!-- 静态资源默认servlet配置 -->
  <mvc:default-servlet-handler/>

  <!-- 配置返回视图的路径，以及识别后缀是jsp文件 -->
  <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
     <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
     <property name="prefix" value="/"/>
     <property name="suffix" value=".jsp"/>
  </bean>
</beans>

接着在webapp下WEB-INF配置web.xml

<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
        version="3.1">

 <display-name>mvcDemo</display-name>

 <welcome-file-list>
   <welcome-file>/pages/index.jsp</welcome-file>
 </welcome-file-list>
 <!-- 注册ServletContext监听器，创建容器对象，并且将ApplicationContext对象放到Application域中 -->
 <listener>
   <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
 </listener>

 <!-- 指定spring核心配置文件 -->
 <context-param>
   <param-name>contextConfigLocation</param-name>
   <param-value>classpath:applicationContext.xml</param-value>
 </context-param>

 <!-- 解决乱码的过滤器 -->
 <filter>
   <filter-name>CharacterEncodingFilter</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>

   <init-param>
     <param-name>forceEncoding</param-name>
     <param-value>true</param-value>
   </init-param>
 </filter>
 <filter-mapping>
   <filter-name>CharacterEncodingFilter</filter-name>
   <url-pattern>/*</url-pattern>
 </filter-mapping>

 <!-- 配置前端控制器 -->
 <servlet>
   <servlet-name>springmvc</servlet-name>
   <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
   <!-- 指定配置文件位置和名称 如果不设置,默认找/WEB-INF/<servlet-name>-servlet.xml -->
   <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>
   <url-pattern>*.do</url-pattern>
 </servlet-mapping>

</web-app>

数据库创建一个表

DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
  `id` varchar(200) NOT NULL,
  `name` varchar(200) CHARACTER SET utf8 NOT NULL,
  `pwd` varchar(200) CHARACTER SET utf8 NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

可以先添加数据方便测试

INSERT INTO `user` VALUES ('', '', '');
INSERT INTO `user` VALUES ('', '', '');
INSERT INTO `user` VALUES ('', '123s', '');

开始编写代码

pojo代码

package com.lwy.pojo;

public class User {
   private String id;

   public String getId() {
       return id;
   }

   public void setId(String id) {
       this.id = id;
   }

   private String name;
   private String pwd;

   public String getName() {
       return name;
   }

   public void setName(String name) {
       this.name = name;
   }

   public String getPwd() {
       return pwd;
   }

   public void setPwd(String pwd) {
       this.pwd = pwd;
   }
}

mapper

package com.lwy.mapper;

import com.lwy.pojo.User;
import org.apache.ibatis.annotations.Param;

import java.util.List;

public interface UserMapper {
   User userlogin(@Param("name")String name, @Param("pwd") String pwd);
   int adduser(User user);
   int delteuser(String id);
   int updateuser(User user);
   User getById(String id);
   List<User> getallUser();
}

xxMapper.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper SYSTEM "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.lwy.mapper.UserMapper">
   <resultMap id="ResultMap" type="User">
       <id property="userid" column="user_id"></id>
       <result property="name" column="name"></result>
       <result property="pwd" column="pwd"></result>
   </resultMap>
   <select id="userlogin" resultType="User">
     SELECT * FROM `user` WHERE `name`=#{name} AND pwd=#{pwd}
   </select>

   <insert id="adduser" parameterType="User">
     INSERT INTO user(id,name,pwd) VALUES(#{id},#{name},#{pwd})
   </insert>

   <delete id="delteuser" parameterType="String">
       delete from user where id=#{id}
   </delete>
   <update id="updateuser" parameterType="User">
     UPDATE user SET NAME=#{name}, pwd=#{pwd} WHERE id=#{id}
   </update>

   <select id="getById" parameterType="String" resultMap="ResultMap">
     SELECT * FROM user WHERE id=#{id}
   </select>

   <select id="getallUser"  resultMap="ResultMap">
       SELECT * FROM user
   </select>
</mapper>

service层

package com.lwy.service;

import com.lwy.pojo.User;
import org.apache.ibatis.annotations.Param;

import java.util.List;

public interface UserService {
   User userlogin(@Param("name") String name, @Param("pwd") String pwd);
   int adduser(User user);
   int delteuser(String id);
   int updateuser(User user);
   User getById(String id);
   List<User> getallUser();
}

实现

package com.lwy.service.impl;

import com.lwy.pojo.User;
import com.lwy.mapper.UserMapper;
import com.lwy.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.UUID;

@Service
public class UserServiceImpl implements UserService {
   @Autowired
   UserMapper userMapper;
   @Override
   public int adduser(User user) {
       String id =  UUID.randomUUID().toString();
       user.setId(id);
       return userMapper.adduser(user);
   }

   @Override
   public int delteuser(String id) {
       return userMapper.delteuser(id);
   }

   @Override
   public int updateuser(User user) {
       return userMapper.updateuser(user);
   }

   @Override
   public User getById(String id) {
       return userMapper.getById(id);
   }

   @Override
   public List<User> getallUser() {
       return userMapper.getallUser();
   }

   @Override
   public User userlogin(String name, String pwd) {

       return  userMapper.userlogin(name, pwd);
   }
}

controller层

package com.lwy.controller;

import com.lwy.pojo.User;
import com.lwy.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

import java.util.List;

@Controller
public class UserController {
   @Autowired
   UserService userService;

   @RequestMapping("/login.do")
   public String  login(String username, String password,Model model){
       System.out.println("开始登陆");
       userService.userlogin(username,password);
//        System.out.println("开始查询所有用户");
//        List<User> userlist = userService.getallUser();
//        model.addAttribute("userlist",userlist);
       return "redirect:/getAllUser.do";
   }

   @RequestMapping("/addUser.do")
   public String addUser(User user){
       userService.adduser(user);
       return "redirect:/getAllUser.do";
   }

   @RequestMapping("/deleteUser.do")
   public String deleteUser(String id){
       userService.delteuser(id);
       return  "redirect:/getAllUser.do";
   }

   @RequestMapping("/updateUser.do")
   public String updateUser(User user){
       userService.updateuser(user);
       return "redirect:/getAllUser.do";
   }

   @RequestMapping("/getById.do")
   public String getUserById(String id,Model model){

       model.addAttribute("user",userService.getById(id));
       return "pages/user_update";
   }

   @RequestMapping("/getAllUser.do")
   public String getAllUser(Model model){
       System.out.println("开始查询所有用户");
       List<User> userlist = userService.getallUser();
       model.addAttribute("userlist",userlist);
       return "pages/userlist";
   }

}

部署到tomcat中

如图

选择本地的tomcat 

页面

登陆

<%--
  Created by IntelliJ IDEA.
  User: hasee
  Date: 2019/6/3
  Time: 16:03
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>

<html>

<head>
    <title>Title</title>
</head>
<body>
<form action="../login.do" method="post">
    账号：<input type="text" name="username" />
    密码：<input type="password" name="password" />
    <button type="submit">提交</button>
</form>
</body>
</html>

显示

<%--
  Created by IntelliJ IDEA.
  User: hasee
  Date: 2019/6/3
  Time: 18:27
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
列表
<a href="/pages/user_add.jsp">添加</a>
<a href="/pages/logout.do">退出</a>
 <a href="/pages/admin.jsp">admin page</a>
<table>

    <tr>
        <td>id</td>
        <td>姓名</td>
        <td>密码</td>
        <td>操作</td>

    </tr>
    <c:forEach items="${requestScope.userlist}" var="list">
        <tr>
            <td>${list.id}</td>
            <td>${list.name}</td>
            <td>${list.pwd}</td>
            <td>
                <a href="../getById.do?id=${list.id}">修改</a>
                <a href="../deleteUser.do?id=${list.id}">删除</a>
            </td>

        </tr>
    </c:forEach>

</table>
</body>
</html>

添加

<%--
  Created by IntelliJ IDEA.
  User: hasee
  Date: 2019/6/3
  Time: 20:18
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<form method="post" action="../addUser.do">
你的账号<input type="text" name="name">
你的密码<input type="text" name="pwd" />
    <button type="submit">保存</button>
</form>
</body>
</html>

修改

<%--
  Created by IntelliJ IDEA.
  User: hasee
  Date: 2019/6/3
  Time: 20:18
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<form method="post" action="../updateUser.do">
    <input type="hidden" name="id" value="${requestScope.user.id}"/>
gfdshjsahsdhsdhsdhsd
    你的账号<input type="text" name="name" value="${requestScope.user.name}"/>
    你的密码<input type="text" name="pwd" value="${requestScope.user.pwd}"/>
    <button type="submit">修改</button>
</form>
</body>
</html>