添加异常消息，以JSON响应 [英] Add exception message to json response

问题描述

我有一个code会抛出异常的具体类型是这样的：

I have a code which throws a specific type of exception like this:

throw new BadDataException("error message");

这几样的异常被抛出的方法，其数据类型是JSON里面。我有这样的这种异常类型的配置：

these kind of exceptions are thrown inside a method whose response type is json. I have a configuration for this exception type like this:

<global-exception-mappings>
     <exception-mapping result="badDataError" exception="mypackage.BadDataException" />
</global-exception-mappings>

<result name="badDataError" type="json">
    <param name="statusCode">500</param>
</result>

我想对异常信息添加到JSON响应展示给用户。有没有什么办法异常消息​​映射到响应时返回500状态code。 Ajax调用会是这样的：

I'd like to add the exception message to the json response to show it to the user. Is there any way to map the exception message to the response when a 500 status code is returned. The ajax call would be something like this:

$.ajax(
{ 
   ...
    success: function(data, textStatus) {
         alert('Success'); 
    },
    error: function (XMLHttpRequest, textStatus, errorThrown) {
         alert("Error");//I'd like to add here the reason (exception message)
    }
    ...
}
);

我如何添加这个例外HTTP 500响应的自动消息？ （如果有可能）

How can I add automatically the message of this exception to the HTTP 500 response? (if it is possible)

感谢

推荐答案

这是最后如何我已经做到了。我添加了一个的errorMessage场到HTTP 500响应这样的。

This is finally how I've done it. I've added a errorMessage field to the HTTP 500 response in this way.

<result name="badDataError" type="httpheader">
                <param name="status">500</param>
                <param name="headers.errorMessage">${exception.message}</param>
</result>

在Ajax请求我恢复的消息是这样的。

and in the ajax request I recover the message like this.

error: function (XMLHttpRequest, textStatus, errorThrown) {
     var errorMessage = XMLHttpRequest.getResponseHeader('errorMessage'); 
     ....
}

也许有一个更优雅的方式来做到这一点，但至少它的工作原理。

Maybe there's a more elegant way to do this, but at least it works.

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