Java通过代理访问网络的几种方法

一、HttpURLConnection方式

/**
  * Java发送请求---HttpURLConnection方式
  */

public static void readContentFromGet() throws IOException{ 

　　URL url = new URL(“http://www.baidu.com”);

　　Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress("20.100.35.32", 2051));
　　HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection(proxy);
　　//设置是否向connection输出，因为这个是post请求，参数要放在http正文内，因此需要设为true
　　httpURLConnection.setDoOutput(true);
　　httpURLConnection.connect();
　　DataOutputStream out = new DataOutputStream(httpURLConnection.getOutputStream());
　　String message = "
      <?xml version="1.0" encoding="UTF-8"?>
      <packet>
        <name>Like</name>
        <age>28</age>
      </packet>";
　　out.write(message.getBytes("UTF-8"), 0,  message.getBytes("UTF-8").length);
　　out.flush();
　　out.close();
　　InputStream inputStream = httpURLConnection.getInputStream();
　　BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
　　String tempLine = reader.readLine();
　　StringBuffer tempStr = new StringBuffer();
　　String crlf = System.getProperty("line.separator");

　　while(tempLine!=null) {
　　　　tempStr.append(tempLine);
　　　　tempStr.append(crlf);
　　　　tempLine = reader.readLine();
　　}
　　System.out.println("响应报文["+tempStr+"]");
　　reader.close();
　　httpURLConnection.disconnect();

}