Question

我使用spring mvc作为我的restful http api。

可以根据需要注释请求参数

@RequestParam(value = "group", required = true) String someParam

在没有所需参数的情况下调用api时，会返回一些丑陋的信息。

HTTP/1.1 400 Bad Request
Content-Type: text/html;charset=ISO-8859-1
Cache-Control: must-revalidate,no-cache,no-store
Content-Length: 1380
Server: Jetty(8.1.9.v20130131)

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"/>
<title>Error 400 Bad Request</title>
</head>
<body><h2>HTTP ERROR 400</h2>
<p>Problem accessing /api/brokers. Reason:
<pre>Bad Request</pre></p><hr /><i><small>Powered by Jetty://</small></i><br/>
<br/>

</body>
</html>

是否可以捕获这些错误，以便我可以通知来电者缺少什么。

Answer 1

你需要抓住MissingServletRequestParameterException

@ExceptionHandler(MissingServletRequestParameterException.class)
public String missingParamterHandler(Exception exception) {
  /*inspect and exception and obtain meaningful message*/
  return "default-error-view"; /*view name of your erro jsp*/
}

Answer 2

@ResponseBody
    @ExceptionHandler(MissingServletRequestParameterException.class)
    public Object missingParamterHandler(Exception exception) {
        // exception handle while specified arguments are not available requested service only. it handle when request is as api json service       
        return  new HashMap() {{ put("result", "failed"); put("type", "required_parameter_missing");}};
    }

如何在缺少必需的请求参数时通知呼叫者？

2 个答案: