type: 'HEAD', // 获取头信息，type=HEAD即可
url : window.location.href,
complete: function( xhr,data ){
// 获取相关Http Response header
var wpoInfo = {
// 服务器端时间
"date" : xhr.getResponseHeader('Date'),
// 如果开启了gzip，会返回这个东西
"contentEncoding" : xhr.getResponseHeader('Content-Encoding'),
// keep-alive ？ close？
"connection" : xhr.getResponseHeader('Connection'),
// 响应长度
"contentLength" : xhr.getResponseHeader('Content-Length'),
// 服务器类型，apache？lighttpd？
"server" : xhr.getResponseHeader('Server'),
"vary" : xhr.getResponseHeader('Vary'),
"transferEncoding" : xhr.getResponseHeader('Transfer-Encoding'),
// text/html ? text/xml?
"contentType" : xhr.getResponseHeader('Content-Type'),
"cacheControl" : xhr.getResponseHeader('Cache-Control'),
// 生命周期？
"exprires" : xhr.getResponseHeader('Exprires'),
"lastModified" : xhr.getResponseHeader('Last-Modified')
}
// 在这里，做想做的事。。。
}
})
1.先实现一个对Response的包装器：Java代码
public class StatusExposingServletResponse extends HttpServletResponseWrapper {
private int httpStatus
public StatusExposingServletResponse(HttpServletResponse response) {
super(response)
}
@Override
public void sendError(int sc) throws IOException {
httpStatus = sc
super.sendError(sc)
}
@Override
public void sendError(int sc, String msg) throws IOException {
httpStatus = sc
super.sendError(sc, msg)
}
@Override
public void setStatus(int sc) {
httpStatus = sc
super.setStatus(sc)
}
public int getStatus() {
return httpStatus
}
}
2.然后实现一个Filter来替换原始的HttpServletResponse，这样你就可以在Filter里面取到statusCode了
Java代码
public class StatusReportingFilter implements Filter {
public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
StatusExposingServletResponse response = new StatusExposingServletResponse((HttpServletResponse)res)
chain.doFilter(req, response)
int status = response.getStatus()
// report
}
public void init(FilterConfig config) throws ServletException {
//empty
}
public void destroy() {
// empty
}
}
// ajax 对象function ajaxObject() {
var xmlHttp
try {
// Firefox, Opera 8.0+, Safari
xmlHttp = new XMLHttpRequest()
}
catch (e) {
// Internet Explorer
try {
xmlHttp = new ActiveXObject("Msxml2.XMLHTTP")
} catch (e) {
try {
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP")
} catch (e) {
alert("您的浏览器不支持AJAX！")
return false
}
}
}
return xmlHttp
}
// ajax post请求：
function ajaxPost ( url , data , fnSucceed , fnFail , fnLoading ) {
var ajax = ajaxObject()
ajax.open( "post" , url , true )
ajax.setRequestHeader( "Content-Type" , "application/x-www-form-urlencoded" )
ajax.onreadystatechange = function () {
if( ajax.readyState == 4 ) {
if( ajax.status == 200 ) {
fnSucceed( ajax.responseText )
}
else {
fnFail( "HTTP请求错误！错误码："+ajax.status )
}
}
else {
fnLoading()
}
}
ajax.send( data )
}
