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在SpringBoot中处理REST服务

resttemplate spring-boot rest spring java

-3

John Joe Mayank Nema · 技术社区 · 7 年前

POST

        HttpEntity messageEntity = new HttpEntity(message, buildHttpHeaders(getTerminalId()));
        String theUrl = "http://123.433.234.12/receive";
        try {
               System.out.println("In try block");
               ResponseEntity<Dto> responseEntity= restTemplate.exchange(theUrl, HttpMethod.POST, messageEntity, Dto.class);
          } catch (HttpStatusCodeException ex) {
              // get http status code
          }

如果URL无效或服务不可用,我希望它抛出404或503之类的错误状态代码。不幸的是,它总是在 try 块有没有办法解决这个问题?

输出

In try block

 String theUrl = "http://123.433.234.12/receive" + transactionId; //invalid Id
   try {
          System.out.println("=========start=========");
          ResponseEntity<Dto> responseEntity= restTemplate.exchange(theUrl, HttpMethod.POST, messageEntity, Dto.class);
          System.out.println("=========end=========");
       } catch (HttpStatusCodeException ex) {
          String a = ex.getStatusCode().toString();
          System.out.println(a);
    }

=========start=========
2017-09-22 14:54:54 [xles-server-ThreadPool.PooledThread-0-running] ERROR c.r.abc.jpos.JposRequestListener - Error HttpStatusCode 500org.springframework.web.client.HttpServerErrorException: 500 null

它停止并且不显示 ========end ======== 或中的任何状态代码 catch

有效url

   http://abc0/receive/hello

 http://abc0/recei/hello

我会得到 404 在catch block中,它看起来很好。但是当我切换到另一个不存在的url时,例如

 http://123.433.234.12/receive

它在try块中。为什么?

2 回复 | 直到 7 年前

Yogesh Badke 7 年前

this doc ,你应该抓住 RestClientException HttpStatusCodeException .

如果您想在特定场景中引发异常,可以这样做

    try {
        restTemplate.exchange(...);
    }
    catch (RestClientException e) {
        // implies error is related to i/o. 
        if (e instanceof ResourceAccessException) {
            // java.net.ConnectException will be wrapped in e with message "Connection timed out".
            if (e.contains(ConnectException.class)) {
                // handle connection timeout excp
            }
        } else if (e instanceof HttpClientErrorException) {
            // Handle all HTTP 4xx error codes here;

        } else if (e instanceof HttpServerErrorException) {
            // Handle all HTTP 5xx error codes here
        }
    }

对于 HttpClientErrorException

HttpClientErrorException clientExcp = (HttpClientErrorException) e;
HttpStatus statusCode = clientExcp.getStatusCode();

像wise一样,您可以获得 HttpServerErrorException .

Mateusz Kasperczyk 7 年前

据我记忆所及 RestTemplate.exchange RestClientException HttpStatusCodeException RestClientException http://123.433.234.12/receive )不是有效地址,因此您无法从中获得任何响应(没有200s,但也没有500s或400s)。试着抓住 RestClientException 然后打印信息,看看发生了什么。然后您可以编写一些代码来管理这种情况。

ResponseEntity 是空的,它在它的身体里有什么。这就是我在尝试理解某些方法时所做的;=)