通过代理java创建套接字

我已经写的代码，必须找到通过套接字使用http头请求的文件大小。。。我试着在我家用非代理连接它的工作。。。但是，当我在我的大学里用一个ip为172.16.4.6，端口为1117的代理服务器尝试它时，它不起作用……任何建议……谢谢

public class Proxytesting {

    private static OutputStream os;
    private static InputStream in;
    private static BufferedReader reader;
    private static int Totalsize;


    public static void main(String[] args) {
        try {         

            URL url_of_file=new URL("http://www.stockvault.net/data/s/124348.jpg");

            String hostaddress=url_of_file.getHost();

            ////////////////////for proxy server ///////////////////
            String textip="172.16.4.7";
            InetAddress host=InetAddress.getByName(textip);
            System.out.println(host);
            int port=1117;

            SocketAddress ad=new InetSocketAddress(host, 1117);
            Proxy proxy = new Proxy(Proxy.Type.SOCKS, ad);

            Socket mysocket2 = new java.net.Socket();
            mysocket2.connect(new InetSocketAddress(hostaddress,80));

            System.out.println("Socket opened to " + hostaddress + "\n");
            String file=url_of_file.getFile();
            System.out.println(" file = "+file);
            os = mysocket2.getOutputStream();

            String headRequest = "HEAD " +url_of_file+" HTTP/1.1\r\n"
                     + "Host: "+ hostaddress +"\r\n\r\n";
            os.write(headRequest.getBytes());

            in = mysocket2.getInputStream();
            reader= new BufferedReader(new InputStreamReader(in));
            String contlength="Content-Length:";

            // 1. Read the response header from server separately beforehand.
            String response;
            Totalsize = 0;
            do{ 
                response = reader.readLine();
                if(response.indexOf("Content-Length") > -1)
                {            
                    Totalsize = Integer.parseInt(response.substring(response.indexOf(' ')+1)); 
                    response = null;
                }
            }while(response != null);  

            System.out.println(" cont_lentht ##### == "+Totalsize);

    } catch (IOException ex) {
        Logger.getLogger(Proxytesting.class.getName()).log(Level.SEVERE, null, ex);
    }

我得到的错误是：

Unknown host exception at for code [ mysocket2.connect(
    new InetSocketAddress(hostaddress,80));]

---

你让事情变得很艰难。用于通过代理进行连接：

HttpConnection conn = (HttpConnection) url_of_file.openConnection(proxy);
conn.setRequestMethod("HEAD");
Totalsize = conn.getContentLength();

---

还有其他HTTP客户机做得更好，但是您不应该创建自己的HTTP客户机，除非现有客户机不能满足您的需要

感谢评论中的线索。我找到了解决问题的办法。我使用错误的端口两次构造

InetSocketAddress

的代码中有一个bug。完整的工作代码如下

public class Proxytesting {
    private static OutputStream os;
    private static InputStream in;
    private static BufferedReader reader;
    private static int Totalsize;
    public static void main(String[] args) {
        try {         
            URL url_of_file=new URL("http://www.stockvault.net/data/s/124348.jpg");

            String hostaddress=url_of_file.getHost();
            ////////////////////for proxy server ///////////////////
            String textip="172.16.4.7";
            InetAddress host=InetAddress.getByName(textip);
            System.out.println(host);
            int port=1117;

            SocketAddress ad=new InetSocketAddress(host, 1117);
            Proxy proxy = new Proxy(Proxy.Type.SOCKS, ad);

            Socket mysocket2 = new java.net.Socket();
            mysocket2.connect(ad);

            System.out.println("Socket opened to " + hostaddress + "\n");
            String file=url_of_file.getFile();
            System.out.println(" file = "+file);
            os = mysocket2.getOutputStream();

            String headRequest = "HEAD " +url_of_file+" HTTP/1.1\r\n"
                     + "Host: "+ hostaddress +"\r\n\r\n";
            os.write(headRequest.getBytes());

            in = mysocket2.getInputStream();
            reader= new BufferedReader(new InputStreamReader(in));
            String contlength="Content-Length:";

            // 1. Read the response header from server separately beforehand.
            String response;
            Totalsize = 0;
            do{ 
                response = reader.readLine();
                if(response.indexOf("Content-Length") > -1)
                {            
                    Totalsize = Integer.parseInt(response.substring(response.indexOf(' ')+1)); 
                    response = null;
                }
            }while(response != null);  

            System.out.println(" cont_lentht ##### == "+Totalsize);

    } catch (IOException ex) {
        Logger.getLogger(Proxytesting.class.getName()).log(Level.SEVERE, null, ex);
    }

---

“不工作”是什么意思？你收到什么错误信息了吗？例外？还是什么都没有？它在代码[mysocket2.connect（新的InetSocketAddress（hostaddress，80））；]处给出未知主机异常，实际上我想创建到远程服务器的套接字连接。使用socket我想找到文件大小……这也是我的代码所做的。事实上，它的功能与您的基本相同，只是您可以免费获得代理支持。；）哈姆！！是的，David Grant先生，你说得很对，但我一直在寻找代理服务器套接字连接的基本编码。对于初学者来说，它有一些基本的概念…在我的情况下，当我第一次加载页面时，SOCKS服务器接受但不连接。。我从控制台看到了。。当我在我的webview中打开另一个url时，它也不会连接。。你能在这方面指导我吗？？