java使用url读取网页资源

package com.susu;

import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;

public class URLDemo2 {
	public static void main(String[] args) {
		try {
			//创建一个url实例
			URL url=new URL("http://www.baidu.com");
			//通过url的openStream获取url对象所表示资源的字节输入流
			InputStream is=url.openStream();
			//将字节输入流转换为字符输入流
			InputStreamReader isr=new InputStreamReader(is,"utf-8");
			//为字符输入流添加缓冲
			BufferedReader br=new BufferedReader(isr);
			String res=null;
			String line=null;
			//读取数据
			while((line=br.readLine())!=null){
				res+=line;
			}
			br.close();
			isr.close();
			is.close();
			System.out.println(res);
		} catch (MalformedURLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
	}
}