[英]Servlet Ajax global exception handling
I have a global handler for my AJAX calls 我有一个AJAX调用的全局处理程序
$.ajaxSetup({
error: function(xhr, textStatus, errorThrown) {
//do something
}
});
And in case of an error my servlet filter sends a specifc error 如果出现错误,我的servlet过滤器会发送一个特定的错误
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException,
ServletException {
if(somethingwrong()) {
response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, "unavailableimage");
}
}
Would you recommend to do something like 你会建议做点什么吗?
$.ajaxError({
error: function(xhr, textStatus, errorThrown) {
if (xhr.status == 408) {
//doSomething
}
else if xhr.responseText.contains("unavailableimage"){
//doSomething
}
}
});
Because I think the responseText is different in every browser. 因为我认为每个浏览器中的responseText都不同。
The response body is available by xhr.responseText
. 响应正文可以通过
xhr.responseText
。
However, the HttpServletResponse#sendError()
( <-- click the link to read the Javadoc yourself) will use the servletcontainer's default error page template or your custom error page template as you've definied in web.xml
. 但是,
HttpServletResponse#sendError()
(< - 单击链接以自己读取Javadoc)将使用servletcontainer的默认错误页面模板或您在web.xml
定义的自定义错误页面模板。 This is a HTML document which you thus have to parse yourself. 这是一个HTML文档,因此您必须自己解析。
As per your comment on the other answer, you seem to be using Tomcat and retrieving its default error page; 根据您对其他答案的评论,您似乎正在使用Tomcat并检索其默认错误页面; the message is available as first
<u>
element of the second <p>
. 该消息可用作第二个
<p>
第一个<u>
元素。 So this should do: 所以这应该做:
var errorMessage = $(xhr.responseText).filter('p:eq(1)').find('u').text();
if (errorMessage == 'unavailableimage') {
// ...
}
You only need to keep in mind that you're this way tight coupled to the markup of the (default) error page. 您只需要记住,这种方式与(默认)错误页面的标记紧密相关。 Better is to not use
HttpServletResponse#sendError()
, but just set the status by HttpServletResponse#setStatus()
( <-- yes, click it to read javadoc, the answer was in there) and write the error message to the response body yourself: 更好的是不使用
HttpServletResponse#sendError()
,但只需通过HttpServletResponse#setStatus()
设置状态(< - 是,单击它以读取javadoc,答案就在那里)并将错误消息写入响应正文:
response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
response.getWriter().write("unavailableimage");
This way the xhr.responseText
is exactly unavailableimage
. 这样
xhr.responseText
就完全unavailableimage
。
if (xhr.responseText == 'unavailableimage') {
// ...
}
In my projects, I'm using this function for debugging ajax : 在我的项目中,我正在使用此函数来调试ajax:
$.ajaxSetup({
error:function(x,e){
if(x.status==0){
alert('You are offline!!\n Please Check Your Network.');
}else if(x.status==404){
alert('Requested URL not found.');
}else if(x.status==500){
alert('Internal Server Error.\n'+x.responseText););
}else if(e=='parsererror'){
alert('Error.\nParsing JSON Request failed.');
}else if(e=='timeout'){
alert('Request Time out.');
}else {
alert('Unknow Error.\n'+x.responseText);
}
}
});
so with your code, you can test if the x.responseText
contains 'unavailableimage', but testing it by error code and error message is better ;) 所以使用你的代码,你可以测试
x.responseText
包含'unavailableimage',但是通过错误代码测试它并且错误消息更好;)
Another way to get only the response error message is to use : var responseText = $.httpData(xhr)
depending of your version of JQuery (< 1.5.2) 获取响应错误消息的另一种方法是使用:
var responseText = $.httpData(xhr)
具体取决于您的JQuery版本(<1.5.2)
Or using json : var responseText = $.parseJSON(x.responseText);
或者使用json:
var responseText = $.parseJSON(x.responseText);
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