Maven+SSM框架，实现单表简单的增删改查

目录

1.创建web Maven项目

2.创建java源码文件和resources资源文件

3.创建数据库配置文件：jdbc.properties

4.项目总体目录：

5.添加spring配置文件：applicationContext.xml

6.添加springMVC配置文件：springMVC.xml

7.修改web.xml

8.创建数据库相关表

9.根据数据库表创建pojo类：User.java

10.编写dao层->mapper接口和xml文件 ：UserMapper.java、UserMapper.xml

11.编写service层->UserService.java、UserServiceImpl.java

12.编写controller层->UserController.java

13.在jsp文件夹下创建edit.jsp和view.jsp

14.配置tomcat，启动服务器（记得加载项目名）

15.查看运行结果（已经成功）

16.项目源码

---

前言：学习maven后，感觉很厉害就搭建个项目小项目玩玩。

功能：实现表的增删改查

工具：IDEA    jdk 1.8   mysql  

整体项目结构：

1.创建web Maven项目

，接下来在pom文件加入项目所需依赖：

 <dependencies>
    <!--Spring框架核心库 -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>4.2.4.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-tx</artifactId>
      <version>4.2.4.RELEASE</version>
    </dependency>
    <!-- Spring Web -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>4.2.4.RELEASE</version>
    </dependency>
    <!--连接驱动-->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.46</version>
    </dependency>
    <!--数据源-->
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>1.1.10</version>
    </dependency>
    <!-- mybatis ORM框架 -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.4.1</version>
    </dependency>
    <!--mybatis-spring适配器 -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>1.3.0</version>
    </dependency>
    <!--整合mybatis如果不加这个包会报错 java.lang.NoClassDefFoundError: org/springframewor-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>4.2.4.RELEASE</version>
    </dependency>
    <!--测试-->
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
      <scope>test</scope>
    </dependency>
    <!--引入JSTL标签-->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
    </dependency>
    <dependency>
      <groupId>taglibs</groupId>
      <artifactId>standard</artifactId>
      <version>1.1.2</version>
    </dependency>

  </dependencies>

2.创建java源码文件和resources资源文件

3.创建数据库配置文件：jdbc.properties

resources目录下添加：jdbc.properties

#数据库配置文件
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf8
jdbc.username=root
jdbc.password=root

4.项目总体目录：

先给出项目总体目录

创建好java目录下的分层的包，resources下创建存放mapper的包，WEB-INF下创建jsp放跳转的页面（下面的配置文件中会配置这些路径）

5.添加spring配置文件：applicationContext.xml

resources目录下添加：applicationContext.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/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
     http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

    <!-- 导入数据库配置文件 -->
    <context:property-placeholder location="classpath:jdbc.properties"/>
    <!-- 扫描包  这里的包需要根据自己java目录下的包名修改 -->
    <context:component-scan base-package="com.demo.service" />
    <!-- 配置数据库连接池 -->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <!-- 基本属性 url、user、password -->
        <property name="url" value="${jdbc.url}" />
        <property name="username" value="${jdbc.username}" />
        <property name="password" value="${jdbc.password}" />

    </bean>

    <!--Mybatis的SessionFactory配置-->
    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="typeAliasesPackage" value="com.demo.pojo" />
        <property name="dataSource" ref="dataSource"/>
        <property name="mapperLocations" value="classpath:mapper/*.xml"/>

    </bean>

    <!--Mybatis的Mapper文件识别-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.demo.dao"/>
    </bean>

</beans>

6.添加springMVC配置文件：springMVC.xml

resources目录下添加：springMVC.xml，并且根据文件中‘视图定位’的配置，所以在WEB-INF下创建jsp文件夹

<?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-3.0.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd">


    <context:component-scan base-package="com.demo.controller" />
    <!--
        配置如果没有<mvc:annotation-driven/>，
        那么所有的Controller可能就没有解析，所有当有请求时候都没有匹配的处理请求类，
        就都去<mvc:default-servlet-handler/>即default servlet处理了。
        添加上<mvc:annotation-driven/>后，
        相应的do请求被Controller处理，而静态资源因为没有相应的Controller就会被default servlet处理。
        总之没有相应的Controller就会被default servlet处理就ok了。
    -->
    <mvc:annotation-driven />
    <!--开通静态资源的访问-->
    <mvc:default-servlet-handler />

    <!-- 视图定位 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />
        <property name="prefix" value="/WEB-INF/view/" />
        <property name="suffix" value=".jsp" />
    </bean>

</beans>

7.修改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_2_5.xsd"
         version="2.5">

  <!-- spring的配置文件-->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:applicationContext.xml</param-value>
  </context-param>
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>

  <!--中文过滤器-->
  <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>
  </filter>
  <filter-mapping>
    <filter-name>CharacterEncodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

  <!-- spring mvc核心：分发servlet -->
  <servlet>
    <servlet-name>mvc-dispatcher</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <!-- spring mvc的配置文件 -->
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:springMVC.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>mvc-dispatcher</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>

</web-app>

8.创建数据库相关表

/*
 Navicat Premium Data Transfer

 Source Server         : phpStudy
 Source Server Type    : MySQL
 Source Server Version : 50553
 Source Host           : localhost:3306
 Source Schema         : test

 Target Server Type    : MySQL
 Target Server Version : 50553
 File Encoding         : 65001

 Date: 16/09/2019 19:46:40
*/

SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;

-- ----------------------------
-- Table structure for user
-- ----------------------------
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user`  (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(255) CHARACTER SET gbk COLLATE gbk_chinese_ci NULL DEFAULT NULL,
  `password` varchar(255) CHARACTER SET gbk COLLATE gbk_chinese_ci NULL DEFAULT NULL,
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = MyISAM AUTO_INCREMENT = 9 CHARACTER SET = gbk COLLATE = gbk_chinese_ci ROW_FORMAT = Dynamic;

-- ----------------------------
-- Records of user
-- ----------------------------
INSERT INTO `user` VALUES (1, 'cheng', '128946');
INSERT INTO `user` VALUES (3, 'eff', 'f');
INSERT INTO `user` VALUES (4, 'fwefw', 'wef');
INSERT INTO `user` VALUES (8, 'fwef', '13');

SET FOREIGN_KEY_CHECKS = 1;

9.根据数据库表创建pojo类：User.java

pojo的编写规则：数据库字段对应类字段，字段类型要一直 。

package com.demo.pojo;

import java.io.Serializable;

public class User implements Serializable {

    private Integer id;
    private String name;
    private String password;

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public Integer getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name == null ? null : name.trim();
    }
}

10.编写dao层->mapper接口和xml文件 ：UserMapper.java、UserMapper.xml

UserMapper.xml放在resourcesmapper下，UserMapper.java放在com.demo.dao这个包下：

注意namespace="com.demo.dao.UserMapper"，这里一定写对应的mapper接口具体路径

UserMapper接口的编写规则：

  (1）方法名和对应的mapper配置文件中查询语句的id相同

（2）返回类型和resultType的类型一致，没有就是void。

（3）方法中的参数列表中的类型和parameterType一致。

（4）mapper配置文件的namespace对应mapper接口类的全路径。

UserMapper.java

package com.demo.dao;

import com.demo.pojo.User;

import java.util.List;

public interface UserMapper {

    List<User> list();

    void del(int id);

    void update(User user);

    void add(User user);

    User get(int id);

}

UserMapper.xml

<?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.demo.dao.UserMapper" >

    <select id="list" resultType="user">
    select * from user
  </select>

    <update id="update" parameterType="user">
     update user set name=#{name} ,password=#{password} where id=#{id}
  </update>

    <insert id="add" parameterType="user">
     insert into user values (null,#{name},#{password});
  </insert>

    <delete id="del">
    delete from user where id=#{id}
  </delete>

    <select id="get" resultType="user">
    select * from user where id =#{id}
  </select>

</mapper>

11.编写service层->UserService.java、UserServiceImpl.java

UserService.java

package com.demo.service;

import com.demo.pojo.User;

import java.util.List;

public interface UserService {

    List<User> list();
    void del(int id);
    void update(User user);
    void add(User user);
    User get(int id);

}

UserServiceImpl.java

package com.demo.service.impl;

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

import java.util.List;

@Service
public class UserServiceImpl implements UserService{

    @Autowired
    UserMapper userMapper;
    public List<User> list() {
        return userMapper.list();
    }
    public void add(User user) {
        userMapper.add(user);
    }
    public void del(int id) {
        userMapper.del(id);
    }
    public void update(User user) {
        userMapper.update(user);
    }
    public User get(int id) {
        return userMapper.get(id);
    }


}

12.编写controller层->UserController.java

package com.demo.controller;

import com.demo.pojo.User;
import com.demo.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
@RequestMapping("")
public class UserController {

    @Autowired
    UserService userService;
    @RequestMapping("list")
    public String list(Model model){
        List<User> us= userService.list();
        model.addAttribute("us", us);
        return "view";
    }
    @RequestMapping("add")
    public String add(User user,Model model){
        userService.add(user);
        return "redirect:list";
    }
    @RequestMapping("del")
    public String del(int id){
        userService.del(id);
        return "redirect:list";
    }
    @RequestMapping("editUI")
    public String editUI(int id,Model model){
        User user = userService.get(id);
        model.addAttribute("user",user);
        return "edit";
    }
    @RequestMapping("update")
    public String update(User user){
        userService.update(user);
        return "redirect:list";
    }

}

13.在jsp文件夹下创建edit.jsp和view.jsp

edit.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<html>
<head>
    <title>Title</title>
    <style>
        #edit{300px;height:500px;margin: 100px auto}
    </style>
</head>
<body>
<div id="edit">
    <form action="/update">
        姓名：<input type="text" name="name" value="${user.name}"/><br/>
        密码：<input type="text" name="password" value="${user.password}"/><br/>
        <input type="hidden" value="${user.id}" name="id">
        <button type="submit" value="">修改</button>
    </form>
</div>
</body>
</html>

view.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
    <title>Title</title>
    <style>
        table,table tr th, table tr td { border:1px solid rgba(41, 36, 35, 0.96); }
        #mytable{300px;margin: 100px auto}
        #add{300px;height:500px;margin: 100px auto}
    </style>
</head>
<body>
<div id="list">
    <table id="mytable">
        <thead>
        <th>id</th>
        <th>名字</th>
        <th>密码</th>
        <th>修改</th>
        <th>删除</th>
        </thead>
        <tbody>
        <c:forEach items="${us}" var="user">
            <tr>
                <td>${user.id}</td>
                <td>${user.name}</td>
                <td>${user.password}</td>
                <td><a href="editUI?id=${user.id}">edit</a> </td>
                <td><a href="del?id=${user.id}">delete</a></td>
            </tr>
        </c:forEach>
        </tbody>
    </table>
</div>

<div id="add">
    <form action="/add">
        姓名：<input type="text" name="name" value=""/><br/>
        密码：<input type="text" name="password" value=""/><br/>
        <button type="submit">添加</button>
    </form>
</div>


</body>
</html>

最后把index.jsp内容修改为:

<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<html>
<head>
    <title>Title</title>

</head>
<body>
<%
    response.sendRedirect(request.getContextPath()+"/list");
%>
</body>
</html>

14.配置tomcat，启动服务器（记得加载项目名）

15.查看运行结果（已经成功）

16.项目源码

源码+sql：https://www.lanzous.com/i679e2d

如果有什么问题，可以私聊我，看见解决

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