restTemplate 调用异常处理，处理http协议层的错误状态40，30等

2024-07-12 21:01| 来源: 网络整理| 查看: 265

我们先来说说问问的所在

Rest 接口中的异常,如何能在RestTemplate 中显示出来.RestTemplate 中try catch 的 e.getMessage()只能是请求本身代码异常.(400 null 或者 500 null),但是用postman 调用的时候是可以显示错误信息的.这是怎么回事?

println

问题代码 Rest 接口 @PostMapping("/test") public ResponseEntity save(@RequestBody List vos){ System.out.println(JSON.toJSONString(vos)); // return new ResponseEntity("fuck you ", HttpStatus.BAD_GATEWAY) ; // return new ResponseEntity("fuck you ", HttpStatus.OK) ; //只有ok 能走通 return new ResponseEntity("fuck you ", HttpStatus.NOT_FOUND) ; RestTemplate调用 RestTemplate restTemplate = new RestTemplate(); List vos = new ArrayList(); try { ResponseEntity responseEntity = restTemplate.postForEntity("url",vos, Object.class); }catch (Exception e) { e.printStackTrace(); System.out.println(e.getMessage()); }

说明try catch 只能获取restTemplate本事是否调取成功,不成功则异常.

##寻求解决办法

restTemplate 对错误处理有个方法,从中获取到response ,从response中获取body即可,说的容易,来看代码

RestTemplate调用 RestTemplate restTemplate = new RestTemplate(); List vos = new ArrayList(); try { // 错误处理 restTemplate.setErrorHandler(new CustomResponseErrorHandler()); ResponseEntity responseEntity = restTemplate.postForEntity("/test",vos, Object.class); }catch (CustomException e) { e.printStackTrace(); System.out.println(e.getBody()); System.out.println(e.getMessage()); } CustomResponseErrorHandler 错误处理类 public class CustomResponseErrorHandler implements ResponseErrorHandler { private ResponseErrorHandler errorHandler = new DefaultResponseErrorHandler(); @Override public void handleError(ClientHttpResponse response) throws IOException { // 队请求头的处理 List customHeader = response.getHeaders().get("x-app-err-id"); String svcErrorMessageID = ""; if (customHeader != null) { svcErrorMessageID = customHeader.get(0); } //对body 的处理 (inputStream) String body = convertStreamToString(response.getBody()); try { errorHandler.handleError(response); } catch (RestClientException scx) { throw new CustomException(scx.getMessage(), scx, body); } } @Override public boolean hasError(ClientHttpResponse response) throws IOException { return errorHandler.hasError(response); } // inputStream 装换为 string private String convertStreamToString(InputStream is) { BufferedReader reader = new BufferedReader(new InputStreamReader(is)); StringBuilder sb = new StringBuilder(); String line = null; try { while ((line = reader.readLine()) != null) { sb.append(line); } } catch (IOException e) { e.printStackTrace(); } finally { try { is.close(); } catch (IOException e) { e.printStackTrace(); } } return sb.toString(); } } 自定义异常捕获的类 public class CustomException extends RestClientException { private RestClientException restClientException; private String body; public RestClientException getRestClientException() { return restClientException; } public void setRestClientException(RestClientException restClientException) { this.restClientException = restClientException; } public String getBody() { return body; } public void setBody(String body) { this.body = body; } public CustomException(String msg, RestClientException restClientException, String body) { super(msg); this.restClientException = restClientException; this.body = body; } } 大功告成

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总结下

主要就是这个restTemplate 没有对错误请求做处理,只有正确请求.所以需要手动增加setErrorHandler 方法处理.

可参考：

https://stackoverflow.com/questions/7878002/resttemplate-handling-response-headers-body-in-exceptions-restclientexceptionhttp://www.developerq.com/article/1504414182

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