web代理服务器实验

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1、Web代理服务器实验附录代码：1.ProxyCache类importjava.net.*;importjava.io.*;importjava.util.*;publicclassProxyCache{privatestaticHashMapURIBuff=newHashMap();///代理入口privatestaticintport;/*客户链接的套接字,port是要代理侦听来自客户端的传入连接的端口号*/privatestaticServerSocketsocket;/*创建一个Proxy对象和套接字*/publics

2、taticvoidinit(intp){port=p;try{socket=newServerSocket(port);}catch(IOExceptione){System.out.println("Errorcreatingsocket:"+e);System.exit(-1);}}publicstaticvoidhandle(Socketclient){Socketserver=null;HttpRequestrequest=null;HttpResponseresponse=null;//处理请求。如果存在异常，就回复并终止它。这意味着客户端将会挂起一段时间，直到超时.读取请

3、求try{BufferedReaderfromClient=newBufferedReader(newInputStreamReader(client.getInputStream()));request=newHttpRequest(fromClient);StringURI=request.URI;byte[]buff=URIBuff.get(URI);if(buff!=null){DataOutputStreamtoClient;/*创建一个toClient对象*/try{toClient=newDataOutputStream(client.getOutputStream()

4、);toClient.writeBytes(response.toString());toClient.write(buff);//缓存//写响应到客户端。首先头部，然后主体client.close();System.out.print("UseBuffered");}catch(IOExceptione){e.printStackTrace();}return;//不再往下走}}catch(IOExceptione){System.out.println("Errorreadingrequestfromclient:"+e);return;}//向服务器发送请求try{//打开套接

5、字并向其中写入请求server=newSocket(request.getHost(),request.getPort());DataOutputStreamtoServer=newDataOutputStream(server.getOutputStream());toServer.writeBytes(request.toString());//以下toServer不能够close，它关闭会导致连接server也会关闭//toServer.close();System.out.println("Requestforwarded.");}catch(UnknownHostExcep

6、tione){System.out.println("Unknownhost:"+request.getHost());System.out.println(e);return;}catch(IOExceptione){System.out.println("Errorwritingrequesttoserver:"+e);return;}//读取相应并将其转发给客户端try{DataInputStreamfromServer=newDataInputStream(server.getInputStream());response=newHttpResponse(fromServer

7、);DataOutputStreamtoClient=newDataOutputStream(client.getOutputStream());toClient.writeBytes(response.toString());URIBuff.put(request.URI,response.body);toClient.write(response.body);//写响应到客户端。首先头部，然后主体client.close();server.close(