跨域问题
原理：通过本地的js，访问java程序，然后把返回的值传回js
得到跨域地址
function convertURL(url){
if(url.substring(0,7)=="http://"){
url = url.replace("?","&");
url ="Poxy.do?url="url;
}
return url;
}
同域服务端
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.io.OutputStreamWriter;
import java.net.*;
import java.util.Enumeration;
public class Proxy extends javax.servlet.http.HttpServlet {
protected void doPost(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response)
throws javax.servlet.ServletException, java.io.IOException {
response.setContentType("text/html;charset=GB2312");
String url = request.getParameter("url");
StringBuffer param = new StringBuffer();
Enumeration enu = request.getParameterNames();
int total = 0;
while(enu.hasMoreElements()){
String name = (String)enu.nextElement();
if(!name.equals("url")){
if(total == 0){
param.append(name).append("=").append(URLEncoder.encode(request.getParameter(name),"UTF-8"));
} else{
param.append("&").append(name).append("=").append(URLEncoder.encode(request.getParameter(name),"UTF-8"));
}
total++;
}
}
PrintWriter out = response.getWriter();
if(url != null){
URL connect = new URL(url.toString());
URLConnection connection = connect.openConnection();
connection.setDoOutput(true);
OutputStreamWriter paramout = new OutputStreamWriter(connection.getOutputStream());
paramout.write(param.toString());
paramout.flush();
BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream(),"GB2312"));
String line;
while((line = reader.readLine()) != null){
out.println(line);
}
paramout.close();
reader.close();
}
}
protected void doGet(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws javax.servlet.ServletException, java.io.IOException {
response.setContentType("text/html;charset=GB2312");
StringBuffer url = new StringBuffer();
url.append(request.getParameter("url"));
Enumeration enu = request.getParameterNames();
int total = 0;
while(enu.hasMoreElements()){
String name = (String)enu.nextElement();
if(!name.equals("url")){
if(total == 0){
url.append("?").append(name).append("=").append(URLEncoder.encode(request.getParameter(name),"UTF-8"));
} else{
url.append("&").append(name).append("=").append(URLEncoder.encode(request.getParameter(name),"UTF-8"));
}
total++;
}
}
PrintWriter out = response.getWriter();
if(url != null){
URL connect = new URL(url.toString());
BufferedReader reader = new BufferedReader(new InputStreamReader(connect.openStream(),"GB2312"));
String line;
while((line = reader.readLine()) != null){
out.println(line);
}
reader.close();
}
// http://www.sohu.com/index.html?name=123&id=000
// Proxy?url=http://www.sohu.com/index.html&name=123&id=000
// url=http://www.sohu.com/index.html&name=123&id=000
// http://www.sohu.com/index.html?id=000&name=123
}
}
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