文章目录
前言
项目中一般都会有规定好的接口返回格式,无论成功与失败,一般格式都是不变的,这样是为了方便前后端统一处理,今天就来说下前后端统一处理的较为优雅的方式;
一、统一的返回格式
一般而言都会有一个统一的返回类作为接口的返回数据的封装,例如:
@Data
public class Result<T> implements Serializable {
private int code = HttpStatus.OK.value();
private String msg;
private T data;
public static <T> Result<T> success() {
return success(null);
}
public static <T> Result<T> failure() {
return failure(HttpStatus.BAD_REQUEST.value(),HttpStatus.BAD_REQUEST.getReasonPhrase());
}
public static <T> Result<T> success(T data) {
return new Result<T>(HttpStatus.OK.value(), HttpStatus.OK.getReasonPhrase(), data);
}
public static <T> Result<T> failure(int errorCode, String errorMsg) {
return failure(errorCode, errorMsg, null);
}
public static <T> Result<T> failure(int code, String errorMsg, T data) {
return new Result<T>(code, errorMsg, data);
}
public Result(int code, String msg, T data) {
this.code = code;
this.msg = msg;
this.data = data;
}
}
然后我们通过此类作为返回参数的统一封装,这样无论成功与否,都是三个参数
code msg data
二、全局异常处理
-
项目中难免会有异常抛出
- 服务端报错的异常
- 处理逻辑中的异常(参数校验, 逻辑不通等)
-
由于我们一般都是前后端分离项目,所以都是接口方式的返回,那么我们只需要处理接口就可以了
@RestControllerAdvice @Slf4j public class ControllerExceptionHandel {
@ExceptionHandler(ValidationException.class) public Result<String> handleException(ValidationException e) { e.printStackTrace(); log.error("参数校验发生异常:{}", e.getMessage()); return Result.failure(HttpStatus.BAD_REQUEST.value(), e.getMessage()); } @ExceptionHandler(value = NullPointerException.class) public Result<String> exceptionHandler(NullPointerException e) { e.printStackTrace(); log.error("空指针异常:{}", e.getMessage()); return Result.failure(HttpStatus.INTERNAL_SERVER_ERROR.value(), e.getMessage()); } @ExceptionHandler(value = {Exception.class, RuntimeException.class}) public Result<String> exceptionHandler(Exception e) { e.printStackTrace(); log.error("运行时发生异常:{}", e.getMessage()); return Result.failure(HttpStatus.INTERNAL_SERVER_ERROR.value(), e.getMessage()); } @ExceptionHandler(AsyncRequestTimeoutException.class) public Result<String> handException(AsyncRequestTimeoutException e) { e.printStackTrace(); log.error("运行时超时异常:{}", e.getMessage()); return Result.failure(HttpStatus.BAD_REQUEST.value(), e.getMessage()); }}
一般来说控制器可以这样用
@RestController
@RequestMapping("lang")
public class LangController {
@RequestMapping("get")
public Result get(){
return Result.success(LocalUtil.get("demo"));
}
}
还是上面的全局异常处理,不过要增加点东西
-
实现ResponseBodyAdvice接口
-
实现两个方法
完整代码如下:@RestControllerAdvice @Slf4j public class ControllerExceptionHandel implements ResponseBodyAdvice{
@Autowired private ObjectMapper objectMapper; @ExceptionHandler(ValidationException.class) public Result<String> handleException(ValidationException e) { e.printStackTrace(); log.error("参数校验发生异常:{}", e.getMessage()); return Result.failure(HttpStatus.BAD_REQUEST.value(), e.getMessage()); } @ExceptionHandler(value = NullPointerException.class) public Result<String> exceptionHandler(NullPointerException e) { e.printStackTrace(); log.error("空指针异常:{}", e.getMessage()); return Result.failure(HttpStatus.INTERNAL_SERVER_ERROR.value(), e.getMessage()); } @ExceptionHandler(value = {Exception.class, RuntimeException.class}) public Result<String> exceptionHandler(Exception e) { e.printStackTrace(); log.error("运行时发生异常:{}", e.getMessage()); return Result.failure(HttpStatus.INTERNAL_SERVER_ERROR.value(), e.getMessage()); } @ExceptionHandler(AsyncRequestTimeoutException.class) public Result<String> handException(AsyncRequestTimeoutException e) { e.printStackTrace(); log.error("运行时超时异常:{}", e.getMessage()); return Result.failure(HttpStatus.BAD_REQUEST.value(), e.getMessage()); } @Override public boolean supports(MethodParameter returnType, Class converterType) { return true; } @SneakyThrows @Override public Object beforeBodyWrite(Object body, MethodParameter returnType, MediaType selectedContentType, Class selectedConverterType, ServerHttpRequest request, ServerHttpResponse response) { Class<?> returnClass = returnType.getMethod().getReturnType(); if (body instanceof String || Objects.equals(returnClass, String.class)) { return objectMapper.writeValueAsString(Result.success(body)); } if (body instanceof Result) { return body; } return Result.success(body); }}
这样控制器中既可以像之前那样使用,还可以像如下使用
它会自动封装返回结果,无需手动封装@RestController @RequestMapping("lang") public class LangController { @RequestMapping("get") public String get(){ return LocalUtil.get("demo"); } }
总结
如果项目中按照这种方式 @RestControllerAdvice + ResponseBodyAdvice接口,就能实现大部分的统一返回出参功能了,无论是正常请求还是异常请求,无论是简单类型还是集合返回,相当于都有了统一的封装处理;
快试试,用到项目中吧~本文转自 jimolvxing.blog.csdn.net/article/det…,如有侵权,请联系删除。