SpringBoot从入门到精通教程（六）

之前学了，这么多东西 thyemeaf 、MyBatis 还有 配置文件等等，今天我们就来做一个小案例
CRUD，程序员的必备

项目结构

pom.xml

        <!-- mybatis 相关依赖 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.1.1</version>
        </dependency>

        <!-- thymeleaf 相关依赖 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>

3. application.properties

logging.level.org.springframework=DEBUG
#springboot   mybatis
mybatis.mapper-locations = classpath:mapper/*Mapper.xml
mybatis.config-location = classpath:mapper/config/sqlMapConfig.xml
mybatis.type-aliases-package = com.spiritmark.demo.model

#数据库
spring.datasource.driver-class-name= com.mysql.jdbc.Driver
spring.datasource.url = jdbc:mysql://localhost:3306/springboot_test?serverTimezone=GMT
spring.datasource.username = root
spring.datasource.password = 123qwe

4. UserController.java

package com.spiritmark.demo.controller;

import java.util.List;

import com.spiritmark.demo.model.User;
import com.spiritmark.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;

@Controller
public class UserController {

    @Autowired
    private UserService userService;

    @RequestMapping("/index")
    public String showUser(Model model){
        List<User> list = userService.findAll();
        model.addAttribute("list",list);
        return "index";
    }

    // 进入添加界面
    @RequestMapping("/intoAdd")
    public String intoAdd(){
        return "add";
    }

    // 添加用户
    @RequestMapping("/add")
    public String add(User user){
        userService.add(user);
        return "redirect:/index";
    }

    // 删除用户
    @RequestMapping("/delete")
    public String delete(int id){
        userService.delete(id);
        return "redirect:/";
    }

    // 进入修改用户
    @RequestMapping("/intoUpdate")
    public String intoUpdate(Model model,int id){
        User user = userService.findById(id);
        model.addAttribute("user",user);
        return "update";
    }

    // 修改用户
    @RequestMapping("/update")
    public String update(User user){
        userService.update(user);
        return "redirect:/index";
    }

}

5. UserMapper.java

package com.spiritmark.demo.mapper;

import com.spiritmark.demo.model.User;
import org.apache.ibatis.annotations.Mapper;

import java.util.List;

@Mapper
public interface UserMapper {

    // 获取所有
    List<User> findAll();
    // 新增
    void add(User user);
    // 删除
    void delete(int id);
    // 编辑
    void update(User user);
    // 查询
    User findById(int id);

}

6. UserServiceImpl.java

package com.spiritmark.demo.service.impl;

import java.util.List;
import java.util.Map;

import com.spiritmark.demo.mapper.UserMapper;
import com.spiritmark.demo.model.User;
import com.spiritmark.demo.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;



@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private UserMapper userMapper;

    // 获取所有
    @Override
    public List<User> findAll() {
        return userMapper.findAll();
    }
    // 新增
    @Override
    public void add(User user) {
        userMapper.add(user);
    }
    // 删除
    @Override
    public void delete(int id) {
        userMapper.delete(id);
    }
    // 修改
    @Override
    public void update(User user) {
        userMapper.update(user);
    }
    // 查询
    @Override
    public User findById(int id) {
        return userMapper.findById(id);
    }

}

7. UserService.java

package com.spiritmark.demo.service;

import com.spiritmark.demo.model.User;
import java.util.List;

public interface UserService {
    // 获取所有
    List<User> findAll();
    // 新增
    void add(User user);
    // 删除
    void delete(int id);
    // 编辑
    void update(User user);
    // 查询
    User findById(int id);
}

8. 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.spiritmark.demo.mapper.UserMapper">
    <select id="findAll" resultType="com.spiritmark.demo.model.User">
        select * from user
    </select>

    <insert id="add" parameterType="com.spiritmark.demo.model.User">
        insert into user (username, password)
        values (#{username,jdbcType=VARCHAR}, #{password,jdbcType=VARCHAR})
    </insert>

    <delete id="delete" parameterType="java.lang.Integer">
        delete from user where id= #{id,jdbcType=INTEGER}
    </delete>

    <select id="findById" resultType="com.spiritmark.demo.model.User">
        select * from user where id= #{id,jdbcType=INTEGER}
    </select>

    <update id="update" parameterType="com.spiritmark.demo.model.User">
        update user set
        username= #{username,jdbcType=VARCHAR},
        password = #{password,jdbcType=VARCHAR}
        where id= #{id,jdbcType=INTEGER}
    </update>
</mapper>

index.html

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:th="http://www.thymeleaf.org"
      xmlns:sec="http://www.thymeleaf.org/thymeleaf-extras-springsecurity3">
<head>
    <title></title>
</head>
<body>
<a th:href="@{/intoAdd}">添加</a>
<table>
    <thead>
    <tr>
        <th>id</th>
        <th>username</th>
        <th>password</th>
        <th>op</th>
    </tr>
    </thead>
    <tbody>
    <tr th:each="user : ${list}">
        <td th:text="${user.id}"></td>
        <td th:text="${user.username}"></td>
        <td th:text="${user.password}"></td>
        <td><a th:href="@{/delete(id=${user.id})}">删除</a><a th:href="@{/intoUpdate(id=${user.id})}">修改</a></td>
    </tr>
    </tbody>
</table>
</body>
</html>

add.html

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:th="http://www.thymeleaf.org"
      xmlns:sec="http://www.thymeleaf.org/thymeleaf-extras-springsecurity3">
<head>
    <title></title>
</head>
<body>
    <form th:action="@{/add}" method="post">
        <input type="text" id="username" name="username">
        <input type="text" id="password" name="password">
        <input type="submit">
    </form>
</body>
</html>

update.html

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:th="http://www.thymeleaf.org"
      xmlns:sec="http://www.thymeleaf.org/thymeleaf-extras-springsecurity3">
<head>
    <title></title>
</head>
<body>
<form th:action="@{/update}" th:object="${user}" method="post">
    <input type="hidden" name="id" th:value="*{id}">
    <input type="text" name="username" id="username" th:value="*{username}">
    <input type="text" name="password" id="password" th:value="*{password}">
    <input type="submit">
</form>
</body>
</html>

大功告成