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API返回對象ResponseDTO<T>,包括以下部分

• result：調(diào)用是否成功
• code：狀態(tài)碼
• msg：結(jié)果消息
• data：響應數(shù)據(jù)，泛型<T>，可以接收任何數(shù)據(jù)類型

ResponseDTO源碼如下：

package com.study.web.dto;
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@AllArgsConstructor
@NoArgsConstructor
@Builder
public class ResponseDTO<T> {
 /**
 * 調(diào)用是否成功
 */
 @Builder.Default
 private boolean result = true;
 /**
 * 狀態(tài)碼
 */
 @Builder.Default
 private String code = "200";
 /**
 * 結(jié)果消息
 */
 @Builder.Default
 private String msg = "";
 /**
 * 響應數(shù)據(jù)
 */
 private T data;
 /** 
 * <p> 返回成功結(jié)果，無返回結(jié)果集 </p >
 * 
 * @return ResponseDTO<T>
 */
 public static <T> ResponseDTO<T> success() {
 return success(null);
 }
 /** 
 * <p> 返回成功結(jié)果，有返回結(jié)果集 </p >
 * 
 * @return ResponseDTO<T>
 */
 @SuppressWarnings("unchecked")
 public static <T> ResponseDTO<T> success(T data) {
 return ((ResponseDTO<T>) ResponseDTO.builder().result(true).code("200").msg("").data(data).build());
 }
 /** 
 * <p> 返回失敗結(jié)果，無返回結(jié)果集 </p >
 * 
 * @return ResponseDTO<T>
 */
 public static <T> ResponseDTO<T> error() {
 return error(null);
 }
 /** 
 * <p> 返回失敗結(jié)果，有返回結(jié)果集 </p >
 * 
 * @return ResponseDTO<T>
 */
 @SuppressWarnings("unchecked")
 public static <T> ResponseDTO<T> error(T data) {
 return ((ResponseDTO<T>) ResponseDTO.builder().result(false).data(data).build());
 }
}

示例代碼：

1、無返回Data

/**
 * 無返回Data
 */
 @PostMApping("/testVoid")
 public ResponseDTO<Void> testVoid(){
 ResponseDTO<Void> result = ResponseDTO.success();
 try {
 //業(yè)務代碼
 studyService.testVoid();
 } catch (Exception e) {
 log.error("處理異常", e);
 result.setResult(false);
 result.setCode("500");
 result.setMsg("異常");
 }
 return result;
 }

2、返回對象

/**
 * 返回對象
 */
 @PostMapping("/testString")
 public ResponseDTO<String> testString(){
 
 ResponseDTO<String> result = ResponseDTO.success();
 try {
 //業(yè)務代碼
 String data = studyService.testString();
 result.setData(data);
 } catch (Exception e) {
 log.error("處理異常", e);
 result.setResult(false);
 result.setCode("500");
 result.setMsg("異常");
 }
 return result;
 }

3、返回對象列表

/**
 * 返回對象列表
 */
 @PostMapping("/testList")
 public ResponseDTO<List<String>> testList(){
 ResponseDTO<List<String>> result = ResponseDTO.success();
 try {
 //業(yè)務代碼
 List<String> data = studyService.testList();
 result.setData(data);
 } catch (Exception e) {
 log.error("處理異常", e);
 result.setResult(false);
 result.setCode("500");
 result.setMsg("異常");
 }
 return result;
 }

在這里我以String型來代表任何類型的對象。

建議：controller層，接口級代碼，不要涉及過多業(yè)務代碼，業(yè)務代碼都放在service層處理并返回。

controller層源碼:

package com.study.web.controller;
import JAVA.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import com.study.service.StudyService;
import com.study.web.dto.ResponseDTO;
import lombok.extern.slf4j.Slf4j;
@RestController
@Slf4j
@RequestMapping("/study")
public class StudyController {
 @Autowired
 StudyService studyService;
 /**
 * 無返回Data
 */
 @PostMapping("/testVoid")
 public ResponseDTO<Void> testVoid(){
 ResponseDTO<Void> result = ResponseDTO.success();
 try {
 //業(yè)務代碼
 studyService.testVoid();
 } catch (Exception e) {
 log.error("處理異常", e);
 result.setResult(false);
 result.setCode("500");
 result.setMsg("異常");
 }
 return result;
 }
 /**
 * 返回對象
 */
 @PostMapping("/testString")
 public ResponseDTO<String> testString(){
 ResponseDTO<String> result = ResponseDTO.success();
 try {
 //業(yè)務代碼
 String data = studyService.testString();
 result.setData(data);
 } catch (Exception e) {
 log.error("處理異常", e);
 result.setResult(false);
 result.setCode("500");
 result.setMsg("異常");
 }
 return result;
 }
 /**
 * 返回對象列表
 */
 @PostMapping("/testList")
 public ResponseDTO<List<String>> testList(){
 ResponseDTO<List<String>> result = ResponseDTO.success();
 try {
 //業(yè)務代碼
 List<String> data = studyService.testList();
 result.setData(data);
 } catch (Exception e) {
 log.error("處理異常", e);
 result.setResult(false);
 result.setCode("500");
 result.setMsg("異常");
 }
 return result;
 }
}

service層源碼：

package com.study.service;
import java.util.List;
import org.springframework.stereotype.Service;
@Service
public class StudyService {
 public void testVoid(){
 }
 public String testString(){
 return null;
 }
 public List<String> testList(){
 return null;
 }
}