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在部署后,我设置了Firefox代理配置,将代理http设置为myproxyappname.appspot.com,端口设置为80。但是Firefox只能浏览谷歌页面。
我正在試圖在Google引擎應用程序上使用Java編寫一個簡單的代理服務器。
這個Servlet是:
import java.io.*;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.Map;
import java.util.List;
import java.util.logging.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.net.URL;
import java.net.HttpURLConnection;
public class ProxyServlet extends HttpServlet {
private ServletContext servletContext;
private Logger log;
public void init(ServletConfig servletConfig) throws ServletException {
servletContext = servletConfig.getServletContext();
log = Logger.getLogger(ProxyServlet.class.getName());
}
public void doGet(HttpServletRequest request, HttpServletResponse response){
doPost(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response){
System.out.println( "doPost" );
BufferedInputStream webToProxyBuf = null;
BufferedOutputStream proxyToClientBuf = null;
HttpURLConnection con;
try{
int statusCode;
int oneByte;
String methodName;
String headerText;
String urlString = request.getRequestURL().toString();
String queryString = request.getQueryString();
urlString += queryString==null?"":"?"+queryString;
URL url = new URL(urlString);
log.info("Fetching >"+url.toString());
con =(HttpURLConnection) url.openConnection();
methodName = request.getMethod();
con.setRequestMethod(methodName);
con.setDoOutput(true);
con.setDoInput(true);
// HttpURLConnection.setFollowRedirects(false);
con.setUseCaches(true);
for( Enumeration e = request.getHeaderNames() ; e.hasMoreElements();){
String headerName = e.nextElement().toString();
con.setRequestProperty(headerName, request.getHeader(headerName));
}
con.connect();
if(methodName.equals("POST")){
BufferedInputStream clientToProxyBuf = new BufferedInputStream(request.getInputStream());
BufferedOutputStream proxyToWebBuf = new BufferedOutputStream(con.getOutputStream());
while ((oneByte = clientToProxyBuf.read()) != -1)
proxyToWebBuf.write(oneByte);
proxyToWebBuf.flush();
proxyToWebBuf.close();
clientToProxyBuf.close();
}
statusCode = con.getResponseCode();
response.setStatus(statusCode);
for( Iterator i = con.getHeaderFields().entrySet().iterator() ; i.hasNext() ;){
Map.Entry mapEntry = (Map.Entry)i.next();
if(mapEntry.getKey()!=null)
response.setHeader(mapEntry.getKey().toString(), ((List)mapEntry.getValue()).get(0).toString());
}
webToProxyBuf = new BufferedInputStream(con.getInputStream());
proxyToClientBuf = new BufferedOutputStream(response.getOutputStream());
StringBuffer sb = new StringBuffer();
while ((oneByte = webToProxyBuf.read()) != -1) {
proxyToClientBuf.write(oneByte);
sb.append(oneByte);
}
System.out.println( sb );
proxyToClientBuf.flush();
proxyToClientBuf.close();
webToProxyBuf.close();
con.disconnect();
}catch(Exception e){
System.out.println(e.getMessage());
e.printStackTrace();
}
finally{
}
}
}
在部署后,我设置了Firefox代理配置,将代理http设置为myproxyappname.appspot.com,端口设置为80。但是Firefox只能浏览谷歌页面。