DAY12
封装对象，返回状态响应码，状态异常返回,分页查询
ExceptionCodeEnum
package cn.niit.hospital.common.enums;
/**
* @Description: 响应状态码枚举类
* @Author: yang_yong
* @CreateTime: 2023/3/21 9:24
* @param: null
* @return: null
**/
public enum ExceptionCodeEnum {
/*
200 请求成功
400 请求参数错误 请求参数错误
405 未登录或登录失效
500 请求失败 服务器内部错误
9001 验证码错误或已过期！ 登录时验证码验证失败
9002 账号或密码错误！ 登录时验证账号密码失败
*/
SUCCESS("200", "请求成功"),
PARAMETER_VALID_ERROR("9001", "参数校验错误！");
private String resCode;
private String resDesc;
public String getResCode() {
return resCode;
}
public String getResDesc() {
return resDesc;
}
ExceptionCodeEnum(String resCode, String resDesc) {
this.resCode = resCode;
this.resDesc = resDesc;
}
}
Controller
package cn.niit.hospital.controller;
import cn.niit.hospital.common.enums.ExceptionCodeEnum;
import cn.niit.hospital.entity.domain.User;
import cn.niit.hospital.entity.vo.BaseResponse;
import cn.niit.hospital.service.UserService;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import java.util.List;
/**
* @Description: 用户控制器
* @Author: tang_meng
* @CreateTime： 2023/3/16 16:23
*/
@RestController
@Slf4j
public class UserController {
@Autowired
private UserService userService;
/**
* @Description: 接口一， 根据某个id查询用户
* @Author: tang_meng
* @CreateTime: 2023/3/20 8:39
* @param: id
* @return: cn.niit.hospital.entity.domain.User
**/
@RequestMapping("/user/{id}")
public User getById(@PathVariable("id") Long id){
User user = userService.getUserById(id);
return user;
}
@GetMapping("/user/{id}")
public BaseResponse getByIdForBaseResponse(@PathVariable("id") Long id){
if (id <0 ){
return BaseResponse.error(ExceptionCodeEnum.PARAMETER_VALID_ERROR);
}
else {
User user = userService.getUserById(id);
return BaseResponse.success(user);}
}
/**
* @Description: 接口二： 查询用户列表接口
* @Author: tang_meng
* @CreateTime: 2023/3/20 8:42
* @param: 封装着查询（多个）条件的用户对象
* @return: java.util.List<cn.niit.hospital.entity.domain.User>
**/
@GetMapping("/user")
public BaseResponse list(User user){
log.info("接受得到的参数 {} "+user);
/**
开启分页查询
PageHelper.startPage(2,3) //参数一：第几页 参数二：每页多少条
不能写死
**/
// PageHelper.startPage(user.getPage(), user.getRows());
List<User> users = userService.getListByUser(user);
PageInfo<User> pageInfo = new PageInfo<>(users);//获取分页对象
return BaseResponse.success(users, pageInfo); //返回带分页的结果
}
/**
* @Description: 接口三： 新增接口
* @Author: tang_meng
* @CreateTime: 2023/3/20 8:44
* @return: java.lang.String
**/
@PostMapping("/user")
// public Integer add(@RequestBody User user)
public BaseResponse add(@RequestBody User user){
log.info("接收到的参数： {} "+user);
int rows = userService.addUser(user);
if (rows>0){
return BaseResponse.success();
}
return BaseResponse.error("90002","添加失败");
}
/**
* @Description: 接口四： 更新接口
* @Author: tang_meng
* @CreateTime: 2023/3/20 8:45
* @param: user
* @return: java.lang.String
**/
@PutMapping("/user")
public String update(User user){
log.info("接收到的参数： {} "+user);
int rows = userService.updateUser(user);
if(rows == 1)
return "更新成功";
else return "更新失败！";
}
// @RequestMapping(value = "/user/{id}", method = RequestMethod.DELETE)
@DeleteMapping("/user/{id}") //和上面等价，推荐这个
public String delete(@PathVariable("id") Long id){
int rows = userService.deleteUser(id);
return "ol";
}
}
BaseEntity
package cn.niit.hospital.entity.domain;
import lombok.Data;
import java.io.Serializable;
import java.util.Date;
/**
* @Description: 基类
* @Author: tang_meng
* @CreateTime： 2023/3/21 10:37
*/
@Data
public class BaseEntity implements Serializable {
//公共字段
private Integer delFlag;
private Long createUserId;
private String createUserName;
private Date gmtcreate;
private Long updateUserId;
private String updateUserName;
private Date gmtupdate;
private Integer page = 1; //第几页, 默认第一页
private Integer rows = 10; //每页多少条，默认10条
}
User
package cn.niit.hospital.entity.domain;
import lombok.Getter;
import lombok.Setter;
import lombok.ToString;
import org.apache.ibatis.type.Alias;
import org.springframework.stereotype.Component;
import java.util.Date;
/**
* @Description: 用户实体
* @Author: tang_meng
* @CreateTime： 2023/3/16 16:22
*/
//加上注解不用写getter和setter方法了
@Getter
@Setter
@ToString
@Alias("User")
@Component
public class User extends BaseEntity{
private Long id;
private String phone;
private String idCard;
private String userName;
private String password;
private Date birthday;
private Integer sex;
private Integer status;
}
BaseResponse
package cn.niit.hospital.entity.vo;
import cn.niit.hospital.common.enums.ExceptionCodeEnum;
import cn.niit.hospital.entity.vo.PageVO;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageInfo;
import lombok.Getter;
import lombok.NoArgsConstructor;
import lombok.Setter;
import lombok.ToString;
@Getter
@Setter
@ToString
@NoArgsConstructor
public class BaseResponse<T> {
private String resCode = "200";
private String resDesc = "请求成功";
private PageVO pageParam;
private T data;
public BaseResponse(T data){
this.data = data;
}
public BaseResponse(T data, PageVO page){
this.data = data;
this.pageParam = page;
}
public static BaseResponse success(Object data, PageInfo pageInfo){
PageVO page = new PageVO();
page.setCurrent(pageInfo.getPageNum());
page.setSize(pageInfo.getSize());
page.setPages(pageInfo.getPages());
page.setTotal(Integer.valueOf(pageInfo.getTotal() + ""));
return new BaseResponse(data, page);
}
public BaseResponse(String resDesc) {
this.resDesc = resDesc;
}
public BaseResponse(String resCode, String resDesc) {
this.resCode = resCode;
this.resDesc = resDesc;
}
/**
* @Description: 成功，默认没有其他数据，只是状态。
* @Author: yang_yong
* @CreateTime: 2023/3/18 23:19
* @return: cn.niit.smbms.model.response.BaseResponse
**/
public static BaseResponse success(){
return new BaseResponse("请求成功!");
}
/**
* @Description: 成功：包含响应数据
* @Author: yang_yong
* @CreateTime: 2023/3/18 23:20
* @param: data
* @return: cn.niit.smbms.model.response.BaseResponse
**/
public static BaseResponse success(Object data){
return new BaseResponse(data);
}
/**
* @Description: 返回错误信息
* @Author: yang_yong
* @CreateTime: 2023/3/18 23:22
* @param: resCode
* @param: resDesc
* @return: cn.niit.smbms.model.response.BaseResponse
**/
public static BaseResponse error(String resCode, String resDesc){
return new BaseResponse(resCode, resDesc);
}
/**
* @Description: 返回错误信息
* @Author: yang_yong
* @CreateTime: 2023/3/18 18:05
* @param: code
* @return: cn.niit.hospital.entity.vo.response.BaseResponse
**/
public static BaseResponse error(ExceptionCodeEnum code) {
return new BaseResponse(code.getResCode(), code.getResDesc());
}
}
PageVo
package cn.niit.hospital.entity.vo;
import lombok.*;
@Setter
@Getter
@EqualsAndHashCode
@ToString
@NoArgsConstructor
public class PageVO {
private int total; //所有的记录数
private int size; //每页多少条记录
private int pages; //总页数
private int current; //当前页
}
依赖
<properties>
<java.version>1.8</java.version>
<pagehelper.starter.version>1.4.5</pagehelper.starter.version>
</properties>
<!-- 分页插件 pagehelper 依赖 -->
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper-spring-boot-starter</artifactId>
<version>${
pagehelper.starter.version}</version>
<exclusions>
<exclusion>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
</exclusion>
</exclusions>
</dependency>
接口实现方法：
@Override
public List<User> getListByUser(User user) {
PageHelper.startPage(user.getPage(), user.getRows());
return userMapper.selectListByUser(user);
}