Java通过代理访问网络的几种方法

一、HttpURLConnection方式
 1 /**
 2   * Java发送请求---HttpURLConnection方式
 3   */
 4 
 5 public static void readContentFromGet() throws IOException{ 
 6 
 7 　　URL url = new URL(“http://www.baidu.com”);
 8 
 9 　　Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress("20.100.35.32", 2051));
10 　　HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection(proxy);
11 　　//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
12 　　httpURLConnection.setDoOutput(true);
13 　　httpURLConnection.connect();
14 　　DataOutputStream out = new DataOutputStream(httpURLConnection.getOutputStream());
15 　　String message = "
      <?xml version="1.0" encoding="UTF-8"?>
      <packet>
        <name>Like</name>
        <age>28</age>
      </packet>";
16 　　out.write(message.getBytes("UTF-8"), 0,  message.getBytes("UTF-8").length);
17 　　out.flush();
18 　　out.close();
19 　　InputStream inputStream = httpURLConnection.getInputStream();
20 　　BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
21 　　String tempLine = reader.readLine();
22 　　StringBuffer tempStr = new StringBuffer();
23 　　String crlf = System.getProperty("line.separator");
24 
25 　　while(tempLine!=null) {
26 　　　　tempStr.append(tempLine);
27 　　　　tempStr.append(crlf);
28 　　　　tempLine = reader.readLine();
29 　　}
30 　　System.out.println("响应报文["+tempStr+"]");
31 　　reader.close();
32 　　httpURLConnection.disconnect();
33 
34 }