@GetMapping("/getUserName")
public String getUserName(){
    return "HuaGe";
}

HuaGe

@GetMapping("/getUserName")
public User getUserName(){
    return new User("HuaGe",18,"男");
}

{
  "name": "HuaGe",
  "age": "18",
  "性別": "男", 
}

@GetMapping("/getUserName")
public static String getUserName(){
    HashMap hashMap = Maps.newHashMap();
    return hashMap.get(0).toString();
}

{
    "timestamp": "2021-08-09T06:56:41.524+00:00",
    "status": 500,
    "error": "Internal Server Error",
    "path": "/sysUser/getUserName"
}

public class Result<T> {
    private int code;
    private String message;
    private T data;?
    public Result() {}
    public Result(int code, String message) {
        this.code = code;
        this.message = message;
    }
    /**
     * 成功
     */
    public static <T> Result<T> success(T data) {
        Result<T> result = new Result<T>();
        result.setCode(ResultMsgEnum.SUCCESS.getCode());
        result.setMessage(ResultMsgEnum.SUCCESS.getMessage());
        result.setData(data);
        return result;
    }
    /**
     * 失敗
     */
    public static <T> Result<T> error(int code, String message) {
        return new Result(code, message);
    }
}

public enum ResultMsgEnum {
    SUCCESS(0, "成功"),
    FAIL(-1, "失敗"),
    AUTH_ERROR(502, "授權(quán)失敗!"),
    SERVER_BUSY(503, "服務(wù)器正忙，請(qǐng)稍后再試!"),
    DATABASE_OPERATION_FAILED(504, "數(shù)據(jù)庫(kù)操作失敗");
    private int code;
    private String message;
?
    ResultMsgEnum(int code, String message) {
        this.code = code;
        this.message = message;
    }
    public int getCode() {
        return this.code;
    }
    public String getMessage() {
        return this.message;
    }
}

@GetMapping("/getUserName")
public Result getUserName(){
    return Result.success("huage");
}

{
    "code": 0,
    "message": "成功",
    "data": "huage"
}

@RestControllerAdvice
public class ResponseAdvice implements ResponseBodyAdvice<Object> {
    @Autowired
    private ObjectMapper objectMapper;
?
    /**
     * 是否開啟功能 true：是 
     */
    @Override
    public boolean supports(MethodParameter methodParameter, Class<? extends HttpMessageConverter<?>> aClass) {
        return true;
    }
?
    /**
     * 處理返回結(jié)果
     */
    @Override
    public Object beforeBodyWrite(Object o, MethodParameter methodParameter, MediaType mediaType, Class<? extends HttpMessageConverter<?>> aClass, ServerHttpRequest serverHttpRequest, ServerHttpResponse serverHttpResponse) {
        //處理字符串類型數(shù)據(jù)
        if(o instanceof String){
            try {
                return objectMapper.writeValueAsString(Result.success(o));
            } catch (JsonProcessingException e) {
                e.printStackTrace();
            }
        }
        return Result.success(o);
    }
}
?

{
    "code": 0,
    "message": "成功",
    "data": {
        "timestamp": "2021-08-09T09:33:26.805+00:00",
        "status": 405,
        "error": "Method Not Allowed",
        "path": "/sysUser/getUserName"
    }
}

@RestControllerAdvice
public class CustomerExceptionHandler {
}

@RestControllerAdvice
@Slf4j
public class CustomerExceptionHandler {
    @ExceptionHandler(AuthException.class)
    public String ErrorHandler(AuthorizationException e) {
        log.error("沒有通過權(quán)限驗(yàn)證！", e);
        return "沒有通過權(quán)限驗(yàn)證！";
    }
?
    @ExceptionHandler(Exception.class)
    public Result Execption(Exception e) {
        log.error("未知異常！", e);
        return Result.error(ResultMsgEnum.SERVER_BUSY.getCode(),ResultMsgEnum.SERVER_BUSY.getMessage());
    }
}

{
    "code": 0,
    "message": "成功",
    "data": {
        "code": 503,
        "message": "服務(wù)器正忙，請(qǐng)稍后再試!",
        "data": null
    }
}

@RestControllerAdvice
public class ResponseAdvice implements ResponseBodyAdvice<Object> {
    @Autowired
    private ObjectMapper objectMapper;
?
    /**
     * 是否開啟功能 true:開啟
     */
    @Override
    public boolean supports(MethodParameter methodParameter, Class<? extends HttpMessageConverter<?>> aClass) {
        return true;
    }
?
    /**
     * 處理返回結(jié)果
     */
    @Override
    public Object beforeBodyWrite(Object o, MethodParameter methodParameter, MediaType mediaType, Class<? extends HttpMessageConverter<?>> aClass, ServerHttpRequest serverHttpRequest, ServerHttpResponse serverHttpResponse) {
        //處理字符串類型數(shù)據(jù)
        if(o instanceof String){
            try {
                return objectMapper.writeValueAsString(Result.success(o));
            } catch (JsonProcessingException e) {
                e.printStackTrace();
            }
        }
        //返回類型是否已經(jīng)封裝
        if(o instanceof Result){
            return o;
        }
        return Result.success(o);
    }
}