Java中的HTTP通信技术详解

 1、使用HTTP的Get方式读取网络数据

     

class ReadByGet extends Thread{
    @Override
    public void run(){
        URL url = new URL("网址");//如果有参数，在网址中携带参数
        URLConnection conn = url.openConnection();
        InputStream is = conn.getInputStream();
        InputStreamReader isr = new InputStreamReader(is);
        BufferedReader br = new BufferedReader(isr);

        String line;
        StringBuilder builder = new StringBuilder();
        while((line=br.readLine())!=null){
              builder.append(line);
        }
        br.close();
        isr.cloae();
        is.close();

        System.out.println(builder.toString);
    }
}
public static void main(String[] args){
    new ReadByGet().start();
} 

      2、使用HTTP的Post方式与网络交互通信  

Class ReadByPost extends Thread{
     @override
     public void run(){
         URL url = new URL("网址");
         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 line;
         StringBuilder builder = new StringBuilder();
         while((line = br.readLine())!=null){
              builder.append(line);
         }
         //关闭资源
         System.out.println(builder.toString);
     }
}
public static void main(){
     new ReadByPost().start();
}

      3、使用HttpClient进行Get方式通信

            apache有一个HttpClient包

1. 

   class Get extends Thread{
   
       HttpClient client = HttpClients.createDefault();
       @Override
       public void run(){
   
            HttpGet get = new HttpGet("http://www.baidu.com");
   
            HttpResponse response = client.execute(get);
            HttpEntity entity = response.getEntity();
            String result = EntityUtils.toString(entity,"UTF-8");
   
            System.out.println(result);
   
       }
   }
   public static void main(String[] args){
       new Get().start();
   }

   

         4、使用HttpClient进行Post方式通信

 

class Post extends Thread{
    HttpClient cilent = HttpClients.CreateDefault();
    @Override
    public void run(){
        HttpPost post = new HttpPost("网址");
        //设置要传的参数
        List<BasicNameValuePair> parameters = new ArratList();
        parameters.add(new BasicNameValuePair("key","value"));

        post.setEntity(new UrlEncodeFormEntity(parameters,"UTF-8"));
        HttpResponse response = client.execute(post);
        HttpEntity entity = response.getEntity();
        String result = EntityUtils.roString(entity,"UTF-8");

        System.out.println(result);

    }
}
main(){
    new Post().start();
}

参见：http://www.cnblogs.com/rocomp/p/4803864.html