涉及到跨域调用时，一般的js ,得不到应有的数据。必须通过UrlConnection来获取到字节数据，来显示出来

思路：当前项目下的js调用到一个jsP，在这个jsp上通过urlConnect 链接来获取数据，并根据状态，回写到所要的js调用之处。

function getText(depart){
?var url="/.././*.jsp?depart="+depart;
?xreq = createXmlHttpRequest();
?if (!xreq){
??alert('Giving up :( Cannot create an XMLHTTP instance');
??return false;
?}
?var url=url+"&temptime="+Math.random();
?xreq.onreadystatechange = showInfo;?
?xreq.open('GET', url, true);
?xreq.send(null);
}
function showArticleInfo(){
?if (xreq.readyState == 4){
??if (xreq.status == 200){
???var articleInfo= xreq.responseText;

//业务处理
????var artId=artInfoArr[0];
????var artTitle=artInfoArr[1];
????var openArticleUrl="/.././*.jsp?art_bh="+artId;
????window.open(openArticleUrl,"newwindow","width=500,height=200,scrollbars=yes,resizable=yes");
???}???
??}
??else if(xreq.status== 500){
???alert('ERRO'+xreq.responseText);
??}
?}
}

?

jsp?? //跨域得到数据

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<%
?String depart = request.getParameter("depart");
?String retArtInfo = "";
?if (!(depart == null || depart.trim().equals(""))) {

??String url = "http://外网地址/项目名/*.do?method=*&depart="+depart+"&tamp="+ new Date().getTime();

//方法返回的是串
??URL U = new URL(url);
??String result = "";
??try {
???URLConnection connection = U.openConnection();
???connection.connect();
???BufferedReader in = new BufferedReader(
?????new InputStreamReader(connection.getInputStream()));

???String line;

???while ((line = in.readLine()) != null) {
????result += line;
???}
???retArtInfo=result;
???in.close();
???out.clear();
??} catch (Exception e) {

??}

?}
?out.println(retArtInfo);
%>

?