SpringBoot----SpringBoot 整合 SpringMVC+MyBatis

需求分析：通過使用 SpringBoot+SpringMVC+MyBatis 整合實現一個對數據庫中的 users 表的 CRUD 的操作

一、 創建項目

1 修改 pom 文件

<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>2.2.0.RELEASE</version>
	</parent>
	<groupId>com.kennosaur</groupId>
	<artifactId>springboot-thymeleaf</artifactId>
	<version>0.0.1-SNAPSHOT</version>

	<dependencies>
		<!-- springBoot的啓動器 -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<!-- web啓動器 -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-thymeleaf</artifactId>
		</dependency>
		<!-- Mybatis啓動器 -->
		<dependency>
			<groupId>org.mybatis.spring.boot</groupId>
			<artifactId>mybatis-spring-boot-starter</artifactId>
			<version>2.1.1</version>
		</dependency>
		<!-- mysql數據庫驅動 -->
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
		</dependency>
		<!-- druid數據庫連接池 -->
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>druid</artifactId>
			<version>1.1.20</version>
		</dependency>
	</dependencies>
</project>

2 添加 application.properties 全局配置文件

spring.datasource.driverClassName=com.mysql.cj.jdbc.Driver

spring.datasource.url=jdbc:mysql://localhost:3306/ssm?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8

spring.datasource.driverClassName=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/ssm?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8
spring.datasource.username=root
spring.datasource.password=root

spring.datasource.type=com.alibaba.druid.pool.DruidDataSource

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

3 數據庫表設計

CREATE TABLE `user` (
`id` int(11) NOT NULL AUTO_INCREMENT, 
`name` varchar(255) DEFAULT NULL, 
`age` int(11) DEFAULT NULL, PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

二、 添加用戶

1 創建實體類

package com.kennosaur.pojo;

public class User {
	private Integer id;
	private String name;
	private Integer age;
	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;
	}
	public Integer getAge() {
		return age;
	}
	public void setAge(Integer age) {
		this.age = age;
	}
	

}

2 創建 mapper 接口以及映射配置文件

package com.kennosaur.mapper;

import com.kennosaur.pojo.User;

public interface UserMapper {
	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.kennosaur.mapper.UserMapper">
	<insert id="insertUser" parameterType="user">
		insert into user(name,age) values(#{name},#{age})
	</insert>
</mapper>

3 創建業務層

package com.kennosaur.serviceImpl;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import com.kennosaur.mapper.UserMapper;
import com.kennosaur.pojo.User;
import com.kennosaur.service.UserService;

@Service
@Transactional
public class UserServiceImpl implements UserService{
	@Autowired
	private UserMapper userMapper;
	@Override
	public void addUser(User user) {
		this.userMapper.insertUser(user);
	}

}

4 創建 Controller

package com.kennosaur.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;

import com.kennosaur.pojo.User;
import com.kennosaur.service.UserService;
import com.kennosaur.serviceImpl.UserServiceImpl;

@Controller
@RequestMapping("/user")
public class UserController {
	@Autowired
	private UserService userServiceImpl;
	
	@RequestMapping("/{page}")
	public String showPage(@PathVariable String page) {
		return page;
	}
	
	@RequestMapping("/addUser")
	public String addUser(User user) {
		this.userServiceImpl.addUser(user);
		return "ok";
	}
}

5 編寫頁面

input.html

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>添加用戶</title>
</head>
<body>
	<form th:action="@{/user/addUser}" method="post">
		用戶姓名：<input type="text" name="name"/><br/>
		用戶年齡：<input type="text" name="age"/><br/>
		<input type="submit" value="確定"/><br/>
	</form>
</body>
</html>

ok.html

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>操作提示頁面</title>
</head>
<body>
	操作成功！！！
</body>
</html>

6 啓動類------@MapperScan("com.kennosaur.mapper")

package com.kennosaur;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@MapperScan("com.kennosaur.mapper")
public class App {
	public static void main(String[] args) {
		SpringApplication.run(App.class, args);
	}
}

三、 查詢用戶

四、 用戶更新

1 更新用戶之前的查詢，並將數據在頁面中回顯

1.1修改 mapper 接口以及映射配置文件

User selectUserById(Integer id);

	<select id="selectUserById" resultType="user">
		select id,name,age from user where id=#{id}
	</select>

1.2修改業務層代碼

	@Override
	public User findUserById(Integer id) {
		return this.userMapper.selectUserById(id);
	}

1.3修改 Controller

	@RequestMapping("/findUserById")
	public String findUserById(Integer id,Model model) {
		User user = this.userServiceImpl.findUserById(id);
		model.addAttribute("user", user);
		return "updateUser";
	}

1.4添加頁面 updateUsers.html  ---------th:field

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
	<form th:action="@{/users/editUser}" method="post">
			<input type="hidden" name="id" th:field="${user.id}"/>
			用戶姓名：<input type="text" name="name" th:field="${user.name}"/><br/>
			用戶年齡：<input type="text" name="age" th:field="${user.age}"/><br/>
			<input type="submit" value="確定"/><br/>
	</form>
</body>
</html>

1.5修改 showUsers.html 頁面添加操作功能

			<td>
				<a th:href="@{/user/findUserById(id=${user.id})}">更新用戶</a>
			</td>

2 用戶更新

2.1修改 mapper 接口以及映射配置文件

void updateUser(User user);

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

2.2修改業務層代碼

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

2.3修改 Controller

	@RequestMapping("/editUser")
	public String editUser(User user) {
		this.userServiceImpl.updateUser(user);
		return "ok";
	}

五、 刪除用戶

1 修改 mapper 接口以及映射配置文件

void deleteUserById(Integer id);

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

2 修改業務層代碼

	@Override
	public void deleteUserById(Integer id) {
		this.userMapper.deleteUserById(id);
	}

3 修改 Controller

	@RequestMapping("/deleteUser")
	public String deleteUser(Integer id) {
		this.userServiceImpl.deleteUserById(id);
		return "redirect:/user/findUserAll";
	}

4 修改 showUsers.html

			<td>
				<a th:href="@{/user/findUserById(id=${user.id})}">更新用戶</a>
				<a th:href="@{/user/deleteUser(id=${user.id})}">刪除用戶</a>
			</td>