前端之家收集整理的这篇文章主要介绍了
AJAX 跨域调用和 Java 跨域 发送请求，
前端之家小编觉得挺不错的，现在分享给大家，也给大家做个参考。
AJAX 跨域调用
前台代码：
HTML代码 
<scripttype="text/javascript"src="jquery-1.7.2.min.js"></script>
<scripttype="text/javascript">
functionRegisterRequest2(){
/*getJSONmethodisokalso...
$.getJSON("http://192.168.1.154:7087/ClusterServer/Rigister?jsoncallback=?",{pwd:'123',username:'tl'},function(json){alert(json.name);});
*/
$.ajax({
url:"http://192.168.1.154:7087/ClusterServer/Rigister?jsoncallback=?",
type:"GET",
data:{pwd:'123',
dataType:"jsonp",
success:function(data){
alert(data.name);
},
error:function(a,b,c){
alert("error=="+b);
}
});
}
</script>
<inputtype="button"onclick="RegisterRequest2();"value="StartRequest"/>
后台Servlet代码：
Java代码
importjava.io.IOException;
importjavax.servlet.ServletException;
importjavax.servlet.http.HttpServlet;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
publicclassRigisterextendsHttpServlet{
@Override
protectedvoiddoGet(HttpServletRequestreq,HttpServletResponseresp)
throwsServletException,IOException{
Stringpwd=req.getParameter("pwd");
Stringusername=req.getParameter("username");
System.out.println("get=="+username+"==="+pwd);
Stringcallback=req.getParameter("jsoncallback");
resp.getWriter().write(callback+"({name:'tzy',phone:'123'})");
}
@Override
protectedvoiddoPost(HttpServletRequestreq,IOException{
Stringpwd=req.getParameter("pwd");
Stringusername=req.getParameter("username");
System.out.println("post=="+username+"==="+pwd);
Stringcallback=req.getParameter("jsoncallback");
resp.getWriter().write(callback+"({name:'tzy',phone:'123'})");
}
}
转载：http://tonl.iteye.com/blog/1682394
Java 跨域 发送请求
@H_
301_340@packagecom.nicchagil.httprequestdemo;importjava.io.BufferedReader;importjava.io.InputStream;importjava.io.InputStreamReader;importjava.io.OutputStream;importjava.io.OutputStreamWriter;importjava.net.HttpURLConnection;importjava.net.URL;importjava.net.URLConnection;publicclassHttpPostRequest{/**
*Main
*@paramargs
*@throwsException
*/
publicstaticvoidmain(String[]args)throwsException{
System.out.println(doPost());
}
/**
*PostRequest
*@return
*@throwsException*/
publicstaticStringdoPost()throwsException{
StringparameterData="username=nickhuang&blog=http://www.cnblogs.com/nick-huang/";
URLlocalURL=newURL("http://localhost:8080/OneHttpServer/");
URLConnectionconnection=localURL.openConnection();
HttpURLConnectionhttpURLConnection=(HttpURLConnection)connection;
httpURLConnection.setDoOutput(true);
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setRequestProperty("Accept-Charset","utf-8");
httpURLConnection.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
httpURLConnection.setRequestProperty("Content-Length",String.valueOf(parameterData.length()));
OutputStreamoutputStream=null;
OutputStreamWriteroutputStreamWriter=null;
InputStreaminputStream=null;
InputStreamReaderinputStreamReader=null;
BufferedReaderreader=null;
StringBufferresultBuffer=newStringBuffer();
StringtempLine=null;
try{
outputStream=httpURLConnection.getOutputStream();
outputStreamWriter=newOutputStreamWriter(outputStream);
outputStreamWriter.write(parameterData.toString());
outputStreamWriter.flush();
if(httpURLConnection.getResponseCode()>=300){thrownewException("HTTPRequestisnotsuccess,Responsecodeis"+httpURLConnection.getResponseCode());
}
inputStream=httpURLConnection.getInputStream();
inputStreamReader=newInputStreamReader(inputStream);
reader=newBufferedReader(inputStreamReader);
while((tempLine=reader.readLine())!=null){
resultBuffer.append(tempLine);
}
}finally{
if(outputStreamWriter!=null){
outputStreamWriter.close();
}
if(outputStream!=null){
outputStream.close();
}
if(reader!=null){
reader.close();
}
if(inputStreamReader!=null){
inputStreamReader.close();
}
if(inputStream!=null){
inputStream.close();
}
}returnresultBuffer.toString();
}
}
转载：http://www.cnblogs.com/nick-huang/p/3859353.html
