Spring Boot+MyBatis+Freemarker(ftl)增删改查

野性酷女 2022-04-24 03:26 475阅读 0赞

## 搭建项目所需要选择的东西 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDkxNDc4NA_size_16_color_FFFFFF_t_70]

## 1.pom.xml所需jar包 ##

<?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>
       <parent>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-parent</artifactId>
          <version>2.1.3.RELEASE</version>
          <relativePath/> 
       </parent>
       <groupId>com.mr</groupId>
       <artifactId>springboot_mybatis</artifactId>
       <version>0.0.1-SNAPSHOT</version>
       <name>springboot_mybatis</name>
       <description>Demo project for Spring Boot</description>
    
       <properties>
          <java.version>1.8</java.version>
       </properties>
    
       <dependencies>
          
          <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-devtools</artifactId>
             <scope>provided</scope>
             <optional>true</optional>
          </dependency>
          
          <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-freemarker</artifactId>
          </dependency>
          <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-web</artifactId>
          </dependency>
          
          <dependency>
             <groupId>org.mybatis.spring.boot</groupId>
             <artifactId>mybatis-spring-boot-starter</artifactId>
             <version>2.0.0</version>
          </dependency>
          
          <dependency>
             <groupId>mysql</groupId>
             <artifactId>mysql-connector-java</artifactId>
             <scope>runtime</scope>
          </dependency>
          
          <dependency>
             <groupId>org.projectlombok</groupId>
             <artifactId>lombok</artifactId>
             <optional>true</optional>
          </dependency>
          <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-test</artifactId>
             <scope>test</scope>
          </dependency>
    
          
          <dependency>
             <groupId>com.alibaba</groupId>
             <artifactId>druid-spring-boot-starter</artifactId>
             <version>1.1.10</version>
          </dependency>
       </dependencies>
    
       <build>
          
          <resources>
             <resource>
                <directory>src/main/java</directory>
                <includes>
                   <include>**/*.xml</include>
                </includes>
             </resource>
          </resources>
    
          <plugins>
             <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
             </plugin>
          </plugins>
       </build>
    
    </project>
    ``

## 2.SpringBoot整合MyBatis配置文件 ##

## application.properties ##

# mybatis 配置
    #使用mybatis配置文件，需要指定该文件的文件路径
    #指定mapper.xml文件的路径，如果mapper.xml与接口在一起则不需要该配置
    #扫描pojo包中的实体类并起别名
    #日志级别改为debug可以显示sql语句，logging.level后为存放mapper接口的包
    #mybatis.mapper-locations=classpath:mapper/*Mapper.xml
    mybatis.type-aliases-package=com.mr.model
    logging.level.com.mr.mapper=debug
    # 开启驼峰命名法 mybatis.configuration.map-underscore-to-camel-case: true
    mybatis.configuration.map-underscore-to-camel-case=true
    
    #配置数据源
    spring.datasource.username=用户名
    spring.datasource.password=密码
    spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
    spring.datasource.url=jdbc:mysql://127.0.0.1:3306/数据库名?serverTimezone=GMT%2B8
    #德鲁伊 连接池
    spring.datasource.type=com.alibaba.druid.pool.DruidDataSource

## 3.user.java实体类 ##

```package com.mr.model;
    
    import lombok.AllArgsConstructor;
    import lombok.Data;
    import lombok.NoArgsConstructor;
    
    /**
     * .
     */
    @Data
    @AllArgsConstructor
    @NoArgsConstructor
    public class User {
        private Integer userId;
        private String userName;
        private String userPass;
    
    }

## 4.增删改查 ##

### (1)UserController.java ###

import com.mr.model.User;
    import com.mr.service.IUserService;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Controller;
    import org.springframework.ui.ModelMap;
    import org.springframework.web.bind.annotation.*;
    
    import java.util.List;
    
    /**
     * 
     */
    //@RestController
        @Controller
    public class UserController {
        @Autowired
        private IUserService userService;
    //    /**
    //     * 查询全部
    //     */
    //    @GetMapping("queryList")
    //    public List<User> queryList(){
    //       List<User> list= userService.queryList();
    //       return list;
    //    }
    //    /**
    //     * 根据Id查询单条数据
    //     */
    //    @GetMapping("/user/{id}")
    //    public User getById(@PathVariable("id") Integer id){
    //        User user=userService.getById(id);
    //        return user;
    //
    //    }
        /**
         * 查询list集合
         */
      @GetMapping("/user")
        public String list(ModelMap map){
    
          List<User> list=userService.list();
          map.put("list",list);
          return "list";
      }
        /**
         * 跳转到增加页面
         */
        @GetMapping("addUser")
        public String addUser(){
            return "add";
        }
    
        /**
         * 增加
         * @param user
         * @return
         */
      @PostMapping("/user")
        public String save(User user){
          userService.save(user);
          return "redirect:/user";
      }
    
        /**
         * 删除
         */
        @DeleteMapping("/user/{userId}")
        public String del(@PathVariable Integer userId){
            userService.del(userId);
            return "redirect:/user";
        }
        /**
         * 跳转到修改页面
         */
        @RequestMapping("/updatePage/{userId}")
        public String updatePage(@PathVariable Integer userId,ModelMap map){
            User user=userService.findById(userId);
            map.put("user",user);
            return "update";
        }
        /**
         * 修改数据
         */
        @PutMapping("/user")
        public String update(User user){
            userService.update(user);
            return "redirect:/user";
        }
    }

### (2)IUserService.java ###

import com.mr.model.User;
    
    import java.util.List;
    
    /**
     * 
     */
    public interface IUserService {
    
       /* *//**
         * 查询全部
         *//*
        List<User> queryList();
        *//**
         * 根据Id查询单条数据
         *//*
        User getById(Integer id);*/
    
        /**
         * 查询list集合
         */
        List<User> list();
        /**
         * 增加
         * @param user
         * @return
         */
        void save(User user);
    
        /**
         * 删除
         * @param userId
         */
        void del(Integer userId);
        /**
         * 跳转到修改页面
         */
        User findById(Integer userId);
    
        /**
         * 修改
         * @param user
         */
        void update(User user);
    }

### (3)UserServiceImpl.java ###

import com.mr.mapper.UserMapper;
    import com.mr.model.User;
    import com.mr.service.IUserService;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Service;
    import org.springframework.transaction.annotation.Transactional;
    
    import java.util.List;
    
    /**
     * 
     */
    @Service(value="userService")
    public class UserServiceImpl implements IUserService {
        @Autowired
        private UserMapper userMapper;
    
        /**
         * 查询全部
         */
       /* @Override
        public List<User> queryList() {
            return userMapper.queryList();
        }*/
    
        /**
         * 根据Id查询单条数据
         */
       /* @Override
        public User getById(Integer id) {
            User user=userMapper.selectByPrimaryKey(id);
            return user;
    
        }
        */
        /**
         * 查询list集合
         */
    
        @Override
        public List<User> list() {
            return userMapper.selectByExample();
        }
    
        /**
         * 增加
         * @param user
         */
        @Transactional
        @Override
        public void save(User user) {
            userMapper.save(user);
    
        }
    
        /**
         * 删除
         * @param userId
         */
        @Override
        @Transactional
        public void del(Integer userId) {
    
            userMapper.del(userId);
        }
    
        /**
         * 跳转到修改页面
         */
        @Override
        public User findById(Integer userId) {
            return userMapper.findById(userId);
        }
    
        /**
         * 修改
         * @param user
         */
        @Override
        @Transactional
        public void update(User user) {
            userMapper.update(user);
        }
    
    
    }

### (4).UserMapper.java ###

import com.mr.model.User;
    
    import java.util.List;
    
    /**
     *
     */
    
    public interface UserMapper {
    
    
        /**
         * 查询全部
         */
        //List<User> queryList();
    
    
        /**
         * 根据Id查询单条数据
         */
        //User selectByPrimaryKey(Integer id);
    
        /**
         * 查询list集合
         */
        List<User> selectByExample();
    
        /**
         * 增加
         * @param user
         * @return
         */
        void save(User user);
    
        /**
         * 删除
         * @param userId
         */
        void del(Integer userId);
    
        /**
         * 跳转到修改页面
         */
        User findById(Integer userId);
    
        /**
         * 修改
         * @param
         */
        void update(User user);
    }

### (5).UserMapper.xml ###

<!DOCTYPE mapper
            PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
            "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
    <mapper namespace="com.mr.mapper.UserMapper">
        <sql id="userCol">
            user_id,user_name,user_pass
        </sql>
        <sql id="userAddCol">
            user_name,user_pass
        </sql>
        
        
        
        
    
      
        
        
        <select id="selectByExample" resultType="user">
            select <include refid="userCol"></include> from t_user
        </select>
        
        
        <insert id="save" parameterType="user">
            insert into t_user(<include refid="userAddCol"></include>)
            values(#{userName},#{userPass})
        </insert>
        
        
        <delete id="del" parameterType="int" >
            delete from t_user where user_id=#{userId}
        </delete>
    
        
        <select id="findById" parameterType="int" resultType="user">
            select <include refid="userCol"></include> from t_user where user_id=#{userId}
        </select>
        
        <update id="update" parameterType="user">
          update t_user set user_name=#{userName},user_pass=#{userPass}
           where user_id=#{userId}
        </update>
    
    </mapper>

### (6).list.ftl ###

<html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
    </head>
    <body>
        <a href="/addUser">增加</a>
        <table border="1">
            <tr>
                <td>编号</td>
                <td>姓名</td>
                <td>密码</td>
                <td>操作</td>
            </tr>
            <#list list as user>
                <tr>
                    <th>${user.userId}</th>
                    <th>${user.userName}</th>
                    <th>${user.userPass}</th>
                    <th>
                        <a href="javascript:del(${user.userId})">删除</a>
                        <a href="/updatePage/${user.userId}">修改</a>
                    </th>
                </tr>
            </#list>
    
        </table>
        
        <form method="post" id="delForm">
            <input type="hidden" name="_method" value="DELETE"/>
        </form>
        <script>
            function del(userId) {
                    var form = document.getElementById("delForm");
                    form.setAttribute("action","/user/"+userId)
                    form.submit();
    
            }
        </script>
    </body>
    </html>

### (7).add.ftl ###

<html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
    </head>
    <body>
    
        <form action="/user" method="post">
            姓名:<input name="userName"/>
            <br/>
            密码:<input name="userPass"/>
            <br/>
            <input type="submit"/>
        </form>
    </body>
    </html>

### (8).update.ftl ###

<html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
    </head>
    <body>
    
    <form action="/user" method="post">
        <input type="hidden" name="_method" value="put"/>
        <input name="userId" type="hidden" value="${user.userId}"/>
        <br/>
        姓名:<input name="userName" value="${user.userName}"/>
        <br/>
        密码:<input name="userPass" value="${user.userPass}"/>
        <br/>
        <input type="submit"/>
    </form>
    </body>
    </html>

### 注意：启动类上需要加上@MapperScan(“com.mr.mapper”) ###

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDkxNDc4NA_size_16_color_FFFFFF_t_70]: /images/20220220/9ade004a20aa46bd9f3e13520f9c7e5b.png