案例实战-Spring boot Web

准备工作

需求&环境搭建

需求：

部门管理：

        查询部门列表

        删除部门

        新增部门

        修改部门

员工管理

        查询员工列表（分页、条件）

        删除员工

        新增员工

        修改员工

 环境搭建

        准备数据库表（dept、emp）

-- 部门管理
create table dept(
    id int unsigned primary key auto_increment comment '主键ID',
    name varchar(10) not null unique comment '部门名称',
    create_time datetime not null comment '创建时间',
    update_time datetime not null comment '修改时间'
) comment '部门表';

insert into dept (id, name, create_time, update_time) values(1,'学工部',now(),now()),(2,'教研部',now(),now()),(3,'咨询部',now(),now()), (4,'就业部',now(),now()),(5,'人事部',now(),now());



-- 员工管理(带约束)
create table emp (
  id int unsigned primary key auto_increment comment 'ID',
  username varchar(20) not null unique comment '用户名',
  password varchar(32) default '123456' comment '密码',
  name varchar(10) not null comment '姓名',
  gender tinyint unsigned not null comment '性别, 说明: 1 男, 2 女',
  image varchar(300) comment '图像',
  job tinyint unsigned comment '职位, 说明: 1 班主任,2 讲师, 3 学工主管, 4 教研主管, 5 咨询师',
  entrydate date comment '入职时间',
  dept_id int unsigned comment '部门ID',
  create_time datetime not null comment '创建时间',
  update_time datetime not null comment '修改时间'
) comment '员工表';

INSERT INTO emp
	(id, username, password, name, gender, image, job, entrydate,dept_id, create_time, update_time) VALUES
	(1,'jinyong','123456','金庸',1,'1.jpg',4,'2000-01-01',2,now(),now()),
	(2,'zhangwuji','123456','张无忌',1,'2.jpg',2,'2015-01-01',2,now(),now()),
	(3,'yangxiao','123456','杨逍',1,'3.jpg',2,'2008-05-01',2,now(),now()),
	(4,'weiyixiao','123456','韦一笑',1,'4.jpg',2,'2007-01-01',2,now(),now()),
	(5,'changyuchun','123456','常遇春',1,'5.jpg',2,'2012-12-05',2,now(),now()),
	(6,'xiaozhao','123456','小昭',2,'6.jpg',3,'2013-09-05',1,now(),now()),
	(7,'jixiaofu','123456','纪晓芙',2,'7.jpg',1,'2005-08-01',1,now(),now()),
	(8,'zhouzhiruo','123456','周芷若',2,'8.jpg',1,'2014-11-09',1,now(),now()),
	(9,'dingminjun','123456','丁敏君',2,'9.jpg',1,'2011-03-11',1,now(),now()),
	(10,'zhaomin','123456','赵敏',2,'10.jpg',1,'2013-09-05',1,now(),now()),
	(11,'luzhangke','123456','鹿杖客',1,'11.jpg',5,'2007-02-01',3,now(),now()),
	(12,'hebiweng','123456','鹤笔翁',1,'12.jpg',5,'2008-08-18',3,now(),now()),
	(13,'fangdongbai','123456','方东白',1,'13.jpg',5,'2012-11-01',3,now(),now()),
	(14,'zhangsanfeng','123456','张三丰',1,'14.jpg',2,'2002-08-01',2,now(),now()),
	(15,'yulianzhou','123456','俞莲舟',1,'15.jpg',2,'2011-05-01',2,now(),now()),
	(16,'songyuanqiao','123456','宋远桥',1,'16.jpg',2,'2007-01-01',2,now(),now()),
	(17,'chenyouliang','123456','陈友谅',1,'17.jpg',NULL,'2015-03-21',NULL,now(),now());

        创建springboot工程，引入对应的起步依赖（web、mybatis、mysql驱动、lombok）

        配置文件application.properties中引入mybatis的配置信息，准备对应的实体类

#?????
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
#??????url
spring.datasource.url=jdbc:mysql://localhost:3306/tlias
#?????????
spring.datasource.username=root
#????????
spring.datasource.password=1234

#??mybatis???, ????????
mybatis.configuration.log-impl=org.apache.ibatis.logging.stdout.StdOutImpl

#??mybatis??????????? a_column ------> aCloumn
mybatis.configuration.map-underscore-to-camel-case=true

        准备对应的Mapper、Service（接口、实现类）、Controller基础结构

开发规范

案例基于当前最主流的前后端分离模式进行开发

Restful

        REST，表述性状态转换，它是一种软件架构分格

 注意：REST是风格，是约定方式，约定不是规定，可以打破

           描述模块的功能通常使用复数，也就是加s的格式来描述，表示此类资源，而非单个资源，如：users、emps、books....

前后端交互统一响应结果Result

package com.itbignyi.tliaswebmanagement.pojp;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@NoArgsConstructor
@AllArgsConstructor
public class Result {
    private Integer code;//响应码，1 代表成功; 0 代表失败
    private String msg;  //响应信息 描述字符串
    private Object data; //返回的数据

    //增删改 成功响应
    public static Result success() {
        return new Result(1, "success", null);
    }

    //查询 成功响应
    public static Result success(Object data) {
        return new Result(1, "success", data);
    }

    //失败响应
    public static Result error(String msg) {
        return new Result(0, msg, null);
    }
}

部门管理

查询部门

代码如下

package com.itbignyi.tliaswebmanagement.controller;

import com.itbignyi.tliaswebmanagement.pojp.Dept;
import com.itbignyi.tliaswebmanagement.pojp.Result;
import com.itbignyi.tliaswebmanagement.service.DeptService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@Slf4j
@RestController
public class DeptController {
    @Autowired
    private DeptService deptService;

    @GetMapping("/depts")

    public Result list() {

        log.info("查询全部部门数据");
        List deptList = deptService.list();

        return Result.success(deptList);
    }


}

package com.itbignyi.tliaswebmanagement;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class TliasWebManagementApplication {

    public static void main(String[] args) {
        SpringApplication.run(TliasWebManagementApplication.class, args);
    }

}

package com.itbignyi.tliaswebmanagement.service;

import com.itbignyi.tliaswebmanagement.pojp.Dept;

import java.util.List;

public interface DeptService {
    List list();
}

package com.itbignyi.tliaswebmanagement.service.impl;

import com.itbignyi.tliaswebmanagement.mapper.DeptMapper;
import com.itbignyi.tliaswebmanagement.pojp.Dept;
import com.itbignyi.tliaswebmanagement.service.DeptService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class DeptServiceImpl implements DeptService {
    @Autowired
    private DeptMapper deptMapper;
    @Override
    public List list() {
        return deptMapper.list();
    }
}

package com.itbignyi.tliaswebmanagement.mapper;

import com.itbignyi.tliaswebmanagement.pojp.Dept;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;

import java.util.List;

@Mapper
public interface DeptMapper {
    @Select("select *from tlias.dept")
    List list();
}

运行代码：

前后端联调

删除部门

代码如下：

 @DeleteMapping("/depts/{id}")
    public Result delete(@PathVariable Integer id) {
        log.info("根据id删除部门：{}", id);
        deptService.delete(id);
        return Result.success();
    }

   void delete(Integer id);

  @Override
    public void delete(Integer id) {
        deptMapper.deleteById(id);
    }

@Delete("delete from tlias.dept where id=#{id}")
    void deleteById(Integer id);

 运行如下：

新增部门

    @GetMapping("/depts/{id}")
    public Result selectById(@PathVariable Integer id){
        log.info("获取id为"+id+"的数据");
        Dept dept = deptService.selectById(id);
        return Result.success(dept);
    }
    /*
     * 修改部门
     * */
    @PutMapping("/depts")
    public Result update(@RequestBody Dept dept){
        log.info("修改部门"+dept);
        deptService.update(dept);
        return Result.success();
    }

   @Select("select * from tlias.dept where id=#{id};")
    Dept selectById(Integer id);

    @Update("update tlias.dept set name = #{name}, update_time = #{updateTime} where id = #{id}")
    void update(Dept dept);

    Dept selectById(Integer id);

    void update(Dept dept);

   @Override
    public Dept selectById(Integer id){
        Dept dept = deptMapper.selectById(id);
        return dept;
    }

    @Override
    public void update(Dept dept){
        dept.setUpdateTime(LocalDateTime.now());
        deptMapper.update(dept);
    }