java - 如何检查Resttemplate是否出错？

Question

如何检查RestTemplate中的SpringBootApplication是否正确出现错误？
我设法创建了一个ResponseErrorHandler，但是不确定如何在我的代码中处理该错误。因此，如果发生错误，我想打印一条错误消息，如果一切正常，则处理响应。我怎样才能做到这一点？

ErrorHandler:

public class MyErrorHandler implements ResponseErrorHandler {
    private boolean error;
    @Override
    public void handleError(ClientHttpResponse response) throws IOException {
        error = false;
        if(response.getStatusCode() == HttpStatus.FAILED_DEPENDENCY) {
            error = true;
            JOptionPane.showMessageDialog(null, "Error " + response.getStatusCode() + ": " /*Can I print my errormessage here?*/);
        }
    }

    @Override
    public boolean hasError(ClientHttpResponse response) throws IOException {
        return error;
    }

获取数据:

HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.TEXT_PLAIN);
        headers.add("Accept", MediaType.TEXT_PLAIN_VALUE);
        HttpEntity<String> httpRequest = new HttpEntity<String>(request, headers);

        RestTemplate restTemplate = new RestTemplate();
        restTemplate.setErrorHandler(new MyErrorHandler());
        restTemplate.getMessageConverters().add(new MappingJackson2HttpMessageConverter());
        restTemplate.getMessageConverters().add(new StringHttpMessageConverter());

        String response = (String) restTemplate.postForObject("http://127.0.0.1:8081/post", httpRequest, String.class);

        /*If error occured, print errormessage, else do something*/

服务器:

@PostMapping("/post")
    ResponseEntity add(@RequestBody String string) {

        if(acceptServerRequest)
            return ResponseEntity.ok("Post recieved: " + string);
        else
            return new ResponseEntity("Error!", HttpStatus.FAILED_DEPENDENCY);
    }

Answer 1

而不是像这样

 String response = (String) restTemplate.postForObject("http://127.0.0.1:8081/post", httpRequest, String.class);

你可以这样

ResponseEntity<String> response = (String) restTemplate.postForEntity("http://127.0.0.1:8081/post", httpRequest, String.class);

使用此响应对象，您可以获得response.getStatus()的状态，该状态会重新调谐HttpStatus类型的对象，该对象具有各种实用程序方法，例如

is2xxSuccessful()
is4xxClientError()  

一般可以用来获取状态