java使用代理发送http请求

    //一种方法是设置全局的代理,在程序中如下设置：  
      
    System.setProperty("proxySet", "true");   
    System.setProperty("http.proxyHost", "192.168.7.33");   
    System.setProperty("http.proxyPort", "8080");  
      
    //还有一种就是在发送每次请求的时候设置代理：  
      
    URL url = new URL("http://www.open-open.com");   
    Proxy proxy = new Proxy(Proxy.Type.DIRECT.HTTP, new InetSocketAddress("192.168.7.33", 8080));   
    HttpURLConnection conn = (HttpURLConnection) url.openConnection(proxy);   
    InputStream in = conn.getInputStream();   
    BufferedReader bin = new BufferedReader(new InputStreamReader(in));   
    String s = null;   
    while((s=bin.readLine())!=null){   
        System.out.println(s);   
    }   
    bin.close();