Java以GET和POST方式实现HTTP通信

 此程序可以建立HTTP通信，分别以GET和POST方式向WEB服务器提交信息，并接收WEB服务器返回的响应。

import java.io.*;
import java.net.*;

public class s311 {
    public static void main(String[] args){
        new ReadByGet().start();
    }
}

class ReadByGet extends Thread{    //以GET方式获得服务器响应
    @Override
    public void run() {
        try {
            URL url = new URL("http://www.baidu.com");
            URLConnection conn = url.openConnection();
            InputStream is = conn.getInputStream();
            InputStreamReader isr = new InputStreamReader(is);   //建立输入流
            BufferedReader br = new BufferedReader(isr);

            String str;
            StringBuilder htmlList = new StringBuilder();
            while((str=br.readLine())!=null){
                htmlList.append(str);
            }
            //关闭资源
            br.close();
            isr.close();
            is.close();
            System.out.println(htmlList.toString());

        } catch (MalformedURLException e) {
            e.printStackTrace();
        }
        catch (IOException e) {
            e.printStackTrace();
        }
    }
}

class ReadByPost extends Thread {    //以POST方式获得服务器响应
    @Override
    public void run() {
        try {
            URL url = new URL("http://www.baidu.com");
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.addRequestProperty("encoding", "UTF-8");
            conn.setDoInput(true);
            conn.setDoOutput(true);
            conn.setRequestMethod("POST");

            OutputStream os = conn.getOutputStream();
            OutputStreamWriter osw = new OutputStreamWriter(os);
            BufferedWriter bw = new BufferedWriter(osw);

            bw.write("向服务器传递的参数");
            bw.flush();

            InputStream is = conn.getInputStream();
            InputStreamReader isr = new InputStreamReader(is);
            BufferedReader br = new BufferedReader(isr);

            String str;
            StringBuilder htmlList = new StringBuilder();
            while((str=br.readLine())!=null){
                htmlList.append(str);
            }
            //关闭资源
            System.out.println(htmlList.toString());
        } catch (ProtocolException e) {
            e.printStackTrace();
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

结果：