这节记录下如何使用枚举类和响应封装类实现响应结果封装。

第一步：新建立一个枚举类。枚举类的要求有两个变量，响应码code，响应信息desc。响应码需要跟前端约定好。

public enum ResponseCode {
    SUCCESS("success",101),
    ERROR("error",102),
    ILLEGAL_ARGUMENT("illegal_argument",103);
    private final int code;
    private final String desc;
    ResponseCode(String desc, int code){
        this.desc = desc;
        this.code = code;
    }

    public int getCode() {
        return code;
    }

    public String getDesc() {
        return desc;
    }

}

第二步：新建一个泛型类

package cn.wcyf.wcai.common;

import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.databind.annotation.JsonSerialize;

import java.io.Serializable;

/**
 * created by mero on 2018/3/13.<br>
 */
@JsonSerialize(include = JsonSerialize.Inclusion.NON_NULL)
public class ResponseObject<T> implements Serializable{
    private Integer code;
    private String msg;
    private T data;

    private ResponseObject(int code){
        this.code  = code;
    }
    private ResponseObject(int code, String msg){
        this.code = code;
        this.msg = msg;
    }
    private ResponseObject(int code, String msg, T data){
        this.code = code;
        this.msg = msg;
        this.data = data;
    }
    private ResponseObject(int code, T data){
        this.code = code;
        this.data  = data;
    }

    public void setStatus(int code){
        this.code = code;
    }
    public int getStatus(){
        return code;
    }

    public void setMsg(String msg){
        this.msg = msg;
    }

    public String getMsg(){
        return msg;
    }

    public void setData(T data){
        this.data = data;
    }

    public T getData(){
        return data;
    }

    public static <T> ResponseObject<T> createSuccessfulResp(){
        return  new ResponseObject<T>(ResponseCode.SUCCESS.getCode());
    }

    private static  <T> ResponseObject<T> createSuccessfulResp(String msg){
        return new ResponseObject<T>(ResponseCode.SUCCESS.getCode(),msg);
    }

    public static  <T> ResponseObject<T> createSuccessfulResp(String msg,T data){
        return new ResponseObject<T>(ResponseCode.SUCCESS.getCode(),msg,data);
    }
    public static  <T> ResponseObject<T> createSuccessfulResp(T data){
        return new ResponseObject<T>(ResponseCode.SUCCESS.getCode(),data);
    }
    public <T> ResponseObject<T> createErrorResp(){
        return new ResponseObject<T>(ResponseCode.ERROR.getCode(),ResponseCode.ERROR.getDesc());
    }
    public static  <T> ResponseObject<T> createErrorResp(String msg){
        return new ResponseObject<T>(ResponseCode.ERROR.getCode(),msg);
    }
    public static  <T> ResponseObject<T> createErrorResp(int code,String desc){
        return  new ResponseObject<T>(code,desc);
    }

    public static <T> ResponseObject<T> createDescAndCodeResp(String desc,int code){
        return new ResponseObject<T>(code,desc);
    }
    @JsonIgnore
    public boolean isSuccess(){
        return  this.code == ResponseCode.SUCCESS.getCode();
    }

}

第三步：测试

在controller中编写一个函数测试

 /**
     * 通过id查询指定学生信息
     * @param id
     * @return
     */

    @GetMapping("/{id}")
    public ResponseObject<Student> getById(@PathVariable Integer id){
        if(id==10||id==11){
            return ResponseObject.createSuccessfulResp(ResponseCode.SUCCESS.getDesc(),studentService.getById(id));
        }
       return ResponseObject.createErrorResp(ResponseCode.ERROR.getCode(),ResponseCode.ERROR.getDesc());
    }

测试结果如下：