java-用HttpURLConnection发送Http请求 _Web前端

java-用HttpURLConnection发送Http请求.
注意：利用URL发送的请求，服务器只返回实体部分，不包括http信息头部分的内容.

package cn.itcast.httpserver;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class TestURLConnection {
	
	public static void main(String[] args) throws Exception {
		URL url = new URL("http://127.0.0.1/index.html");
		HttpURLConnection connection = (HttpURLConnection) url.openConnection();
		
		//connection.getInputStream() 调用该方法才正在意义上去取数据
		BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
		String s =null;
		while((s=reader.readLine())!=null){
			System.out.println(s);
		}
		reader.close();
		connection.disconnect();
	}
	
}