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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.DruidDataSourcemybatis.type-aliases-package=com.by.pojologging.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 mapperPUBLIC "-//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 {@Autowiredprivate UserMapper userMapper;@Overridepublic 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 {@Autowiredprivate UserService userService;@Testpublic 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 {@Autowiredprivate 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

3.查询用户

3.1.mapper

public List<User> listUser();

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

3.2.service

	@Overridepublic 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

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

	@Overridepublic 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

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>{@Overridepublic 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

• 说明

  WebMvcConfigurer配置类其实是Spring内部的一种配置方式，采用JavaBean的形式来代替传统的xml配置文件形式针对框架进行个性化定制，例如：拦截器，类型转化器等等。

• 代码示例

  import com.by.converter.DateConverter;
  import org.springframework.context.annotation.Configuration;
  import org.springframework.format.FormatterRegistry;
  import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
  import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;@Component
  public class MyConfig implements WebMvcConfigurer {@Overridepublic void addFormatters(FormatterRegistry registry) {registry.addConverter(new DateConverter());}}
  

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{@Overridepublic 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;}@Overridepublic void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,ModelAndView modelAndView) throws Exception {}@Overridepublic void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)throws Exception {}}

6.2.配置拦截器

修改MyConfig

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