概述
通过使用整合 SpringBoot + SpringMVC + MyBatis ,实现对users表进行CRUD操作
工具
eclipse + mvn + jdk1.7 + spring boot 1.5.10.RELEASE + mysql
步骤
一、创建项目
- 修改 pom.xml 文件
4.0.0
org.springframework.boot
spring-boot-starter-parent
1.5.10.RELEASE
cn.alinwork
10_springboot_mybatis
0.0.1-SNAPSHOT
1.7
3.0.2.RELEASE
2.0.4
org.springframework.boot
spring-boot-starter-thymeleaf
org.mybatis.spring.boot
mybatis-spring-boot-starter
1.1.1
mysql
mysql-connector-java
com.alibaba
druid
1.0.9
- demo 使用 jdk1.7 + spring boot 1.5.10.RELEASE 版本;
- thymeleaf 是 spring boot 推荐的视图层技术;
- druid 是阿里巴巴开发的号称为监控而生的数据库连接池;
- 创建数据库表
CREATE TABLE `users` (
`id` smallint NOT NULL AUTO_INCREMENT,
`name` varchar(20) DEFAULT NULL,
`age` smallint DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
- 在 application.properties 文件配置连接池
spring.datasource.driverClassName=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/testdb
spring.datasource.username=free
spring.datasource.password=1234
#连接池类型
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
#mybatis 扫描路径
mybatis.type-aliases-package=cn.alinwork.pojo
application.properties 文件 :
Spring Boot 使用“习惯优于配置”(项目中存在大量的配置,此外还内置了一个习惯性的配置,让你无需手动进行配置)的理念让你的项目快速运行起来。所以,我们要想把 Spring Boot 玩的溜,就要懂得如何开启各个功能模块的默认配置,这就需要了解 Spring Boot 的配置文件 application.properties。
Spring Boot 使用了一个全局的配置文件 application.properties,放在 src/main/resources 目录下或者类路径的/config下。Sping Boot 的全局配置文件的作用是对一些默认配置的配置值进行修改。
二、代码编辑
- 创建实体类
package cn.alinwork.pojo;
public class User {
private int id;
private String name;
private int age;
public User() {}
public User(int id, String name, int age) {
super();
this.id = id;
this.name = name;
this.age = age;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
@Override
public String toString() {
return "name: " + name + " ,age: " + age;
}
}
- 创建 Mapper 映射器
package cn.alinwork.mapper;
import java.util.List;
import cn.alinwork.pojo.User;
public interface UserMapper {
//增加用户
int insertUser(User user);
//查询所有用户信息
List selectUserAll();
//根据id查询用户信息
User findUserById(Integer id);
//更新用户信息
int updateUser(User user);
//删除用户
int deleteUser(Integer id);
}
- 编写 sql 文件
insert into user(name,age) values(#{name},#{age})
update user set name = #{name} , age = #{age} where id = #{id}
delete from user where id = #{id}
- namespace 指定对应Mapper 映射器类
- parameterType 为 cn.alinwork.pojo.User 类时,可以用 user 替代;
因为在 application.properties 文件里作了配置
mybatis.type-aliases-package=cn.alinwork.pojo
- 创建 service 类
- 定义接口类
package cn.alinwork.service;
import java.util.List;
import cn.alinwork.pojo.User;
public interface UserService {
int addUser(User user);
List findAllUser();
User findUserById(Integer id);
int updateUser(User user);
int deleteUser(Integer id);
}
- 定义实现类
package cn.alinwork.service.impl;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import cn.alinwork.mapper.UserMapper;
import cn.alinwork.pojo.User;
import cn.alinwork.service.UserService;
@Service
@Transactional
public class UserServiceImpl implements UserService {
@Autowired
private UserMapper userMapper;
@Override
public int addUser(User user) {
return this.userMapper.insertUser(user);
}
@Override
public List findAllUser() {
return this.userMapper.selectUserAll();
}
@Override
public User findUserById(Integer id) {
return this.userMapper.findUserById(id);
}
@Override
public int updateUser(User user) {
return this.userMapper.updateUser(user);
}
@Override
public int deleteUser(Integer id) {
return this.userMapper.deleteUser(id);
}
}
- 创建 controller 类
package cn.alinwork.controller;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import cn.alinwork.pojo.User;
import cn.alinwork.service.UserService;
@Controller
@RequestMapping("/user")
public class UserController {
@Autowired
private UserService userService;
@RequestMapping("/")
private String findUserAll(Model model){
List users = this.userService.findAllUser();
model.addAttribute("users", users);
return "queryAll";
}
@RequestMapping("/gotoAddUser")
private String gotoAddUser(){
return "addUser";
}
@RequestMapping("/addUser")
private String addUser(User user){
this.userService.addUser(user);
return "ok";
}
@RequestMapping("/findUserById")
private String findUserById(int id , Model model){
User user = this.userService.findUserById(id);
model.addAttribute("user", user);
return "update";
}
@RequestMapping("/updateUser")
private String updateUser(User user){
this.userService.updateUser(user);
return "ok";
}
@RequestMapping("/deleteUser")
private String deleteUser(int id){
this.userService.deleteUser(id);
return "ok";
}
}
- 视图文件
- queryAll.html
展示用户数据
- addUser.html
用户新增
- update.html
修改用户
- ok.html
添加成功页
ok !!!
去首页
- 编写启动类
package cn.alinwork;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
/**
* SpringBoot 启动类
*/
@SpringBootApplication
@MapperScan("cn.alinwork.mapper")
public class App {
public static void main(String[] args) {
SpringApplication.run(App.class, args);
}
}
三、测试
在浏览器输入 http://localhost:8080/user/ ,出现页面:
ok,至此已成功完毕......