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SpringBoot整合MyBatis实现CRUD操作项目实践

作者：fpl1116

本文主要介绍了SpringBoot整合MyBatis实现CRUD操作项目实践,如何实现数据库的CRUD创建、读取、更新、删除操作,具有一定的参考价值,感兴趣的可以了解一下

SpringBoot整合MyBatis项目进行CRUD操作项目示例

1.1.需求分析

通过使用 SpringBoot+MyBatis整合实现一个对数据库中的 users 表的 CRUD

1.2.创建工程

04_springboot_mybatis

1.3.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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.2.RELEASE</version>
    </parent>
    
    <groupId>com.by</groupId>
    <artifactId>04_springboot_mybatis</artifactId>
    <version>1.0-SNAPSHOT</version>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <!-- springBoot 的启动器 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!-- Mybatis 启动器 -->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.0.1</version>
        </dependency>
        <!-- mysql 数据库驱动 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.38</version>
        </dependency>
        <!-- druid 数据库连接池 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.0.9</version>
        </dependency>
        <!-- 添加 junit 环境的 jar 包 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.0</version>
        </dependency>
    </dependencies>
</project>

1.4.application.properties

spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/springboot
spring.datasource.username=root
spring.datasource.password=1111
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource

mybatis.type-aliases-package=com.by.pojo

logging.level.com.by.mapper=DEBUG

1.5.启动类

@SpringBootApplication
@MapperScan("com.by.mapper") // @MapperScan 用户扫描MyBatis的Mapper接口
public class App {
	public static void main(String[] args) {
		SpringApplication.run(App.class, args);
	}
}

2.添加用户

2.1.数据表设计

CREATE TABLE `user` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `nam` varchar(255) DEFAULT NULL,
  `sex` int(11) DEFAULT NULL,
  `pwd` varchar(255) DEFAULT NULL,
  `birth` datetime DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=11 DEFAULT CHARSET=utf8;

2.2.pojo

public class User {
    private Integer id;

    private String nam;

    private String pwd;
    
    private Integer sex;

    private Date birth;
}

2.3.mapper

public interface UserMapper {
    public void insertUser(User user);
}

<?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.by.mapper.UserMapper">
    <insert id="insertUser" parameterType="user">
		insert into user(nam,pwd,sex,birth) values(#{nam},#{pwd},#{sex},#{birth})
	</insert>
</mapper>

2.4.service

@Service
@Transactional
public class UserServiceImpl implements UserService {
	@Autowired
	private UserMapper userMapper;

	@Override
	public void addUser(User user) {
		this.userMapper.insertUser(user);
	}
}

2.5.junit

/**
 *  main方法：
 *		ApplicationContext ac=new 
 *       			ClassPathXmlApplicationContext("classpath:applicationContext.xml");
 *  junit与spring整合：
 *      @RunWith(SpringJUnit4ClassRunner.class)：让junit与spring环境进行整合
 *   	@Contextconfiguartion("classpath:applicationContext.xml")  
 *  junit与SpringBoot整合： 
 *		@RunWith(SpringJUnit4ClassRunner.class)：让junit与spring环境进行整合
 *		@SpringBootTest(classes={App.class})：加载SpringBoot启动类。启动springBoot
 */
@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest(classes={App.class})
public class UserServiceTest {

	@Autowired
	private UserService userService;
	
	@Test
	public void testAddUser(){
		User user = new User();
		user.setId(1);
		user.setNam("二狗");
		user.setPwd("111");
        user.setSex(1);
		user.setBirth(new Date());
		this.userService.addUser(user);
	}
}

2.6.controller

@Controller
@RequestMapping("/user")
public class UserController {
	@Autowired
	private UserService userService;

	/**
	 * 页面跳转
	 */
	@RequestMapping("/{page}")
	public String showPage(@PathVariable String page) {
		return page;
	}

	/**
	 * 添加用户
	 */
	@RequestMapping("/addUser")
	public String addUser(User user) {
		this.userService.addUser(user);
		return "ok";
	}
}

2.7.thymeleaf

add.html

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>添加用户</title>
</head>
<body>
<h3>新增用户</h3>
<hr/>
<form th:action="@{/user/addUser}" method="post">
    姓名：<input type="text" name="nam"/><br/>
    密码：<input type="text" name="pwd"/><br/>
    性别：<input type="radio" name="sex" value="1"/>女
         <input type="radio" name="sex" value="0"/>男<br/>
    生日：<input type="text" name="birth"/><br/>
    <input type="submit" value="确定"/><br/>
</form>
</body>
</html>

2.8.测试

在这里插入图片描述

3.查询用户

3.1.mapper

public List<User> listUser();

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

3.2.service

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

3.4.controller

	/**
	 * 查询全部用户
	 */
	@RequestMapping("/listUser")
	public String listUser(Model model) {
		List<User> list = this.userService.listUser();
		model.addAttribute("list", list);
		return "list";
	}

3.5.thymeleaf

list.html

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>首页</title>
    <style type="text/css">
        table {border-collapse: collapse; font-size: 14px; width: 80%; margin: auto}
        table, th, td {border: 1px solid darkslategray;padding: 10px}
    </style>
</head>
<body>
<div style="text-align: center">
    <span style="color: darkslategray; font-size: 30px">欢迎光临！</span>
    <hr/>
    <table class="list">
        <tr>
            <th>id</th>
            <th>姓名</th>
            <th>密码</th>
            <th>性别</th>
            <th>生日</th>
        </tr>
        <tr th:each="user : ${list}">
            <td th:text="${user.id}"></td>
            <td th:text="${user.nam}"></td>
            <td th:text="${user.pwd}"></td>
            <td th:text="${user.sex==1}?'男':'女'"></td>
            <td th:text="${#dates.format(user.birth,'yyyy-MM-dd')}"></td>
        </tr>
    </table>
</div>
</body>
</html>

3.6.测试

在这里插入图片描述

4.用户登录

4.1.mapper

public Users login(User user);

	<select id="login" parameterType="User" resultType="User">
		select * from user where nam=#{nam} and pwd=#{pwd}
	</select>

4.2.service

	@Override
	public Users login(User user) {
		return userMapper.login(user);
	}

4.4.controller

	@RequestMapping("/login")
	public String login(Model model, User user, HttpSession session) {
		User loginUser = usersService.login(user);
		if(user!=null){
			session.setAttribute("loginUser", loginUser);
			return "redirect:/user/listUser";
		}
		return "login";
	}

添加PageController

@Controller
public class PageController {

	@RequestMapping("/")
	public String showLogin(){
		return "login";
	}
}

4.5.thymeleaf

login.html

<html>
<head>
<meta charset="UTF-8">
<title>注册</title>
</head>
<body>
<center>
	<h3>登录</h3>
	<hr/>
	<form th:action="@{/user/login}" method="post">
		账号：<input type="text" name="nam"/><br/>
		密码：<input type="text" name="pwd"/><br/>
		<input type="submit" value="确定"/><br/>
	</form>
</center>
</body>
</html>

4.6.测试

在这里插入图片描述

5.SpringBoot整合日期转换器

5.1.添加日期转换器

import java.text.ParseException;
import java.util.Date;

import org.springframework.core.convert.converter.Converter;
import org.apache.commons.lang3.time.DateUtils;
public class DateConverter implements Converter<String, Date>{

	@Override
	public Date convert(String str) {
	      String[] patterns = new String[]{
	              "yyyy-MM-dd","yyyy-MM-dd hh:mm:ss","yyyy/MM/dd","yyyy/MM/dd hh:mm:ss",
	              "MM-dd-yyyy","dd-MM-yyyy"};
	      
		try {
			Date date = DateUtils.parseDate(str, patterns);
			return date;
		} catch (ParseException e) {
			e.printStackTrace();
		}
		return null;
	}

}

5.2.配置日期转换器

6.SpringBoot整合拦截器

6.1.添加拦截器

package com.by.interceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.by.pojo.Users;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;


public class LoginInterceptor implements HandlerInterceptor{

	@Override
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response,
                             Object handler)throws Exception {
		Users user = (Users) request.getSession().getAttribute("user");
		if(user!=null){
			return true;
		}
		response.sendRedirect("/");
		return false;
	}

	@Override
	public void postHandle(HttpServletRequest request, HttpServletResponse response, 
                           Object handler,ModelAndView modelAndView) throws Exception {

	}

	@Override
	public void afterCompletion(HttpServletRequest request, HttpServletResponse response, 
                                Object handler, Exception ex)throws Exception {
	}

}

6.2.配置拦截器

修改MyConfig

	//<mvc:interceptors>
	@Override
	public void addInterceptors(InterceptorRegistry registry) {
		registry.addInterceptor(new LoginInterceptor()).addPathPatterns("/emp/**");
	}

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