Java 实现一个简单的网络爬虫

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


public class BasicSpaider {

	public static void main(String[] args) {
	URL url = null;
	InputStream is = null;
	BufferedReader br = null;
	FileWriter fw = null;
	BufferedWriter bw = null;
	String temp = null;
	StringBuilder sb = new StringBuilder();
	try {
		fw = new FileWriter("C:/Users/Xiaofei/Desktop/163首页.txt",true); 
		bw = new BufferedWriter(fw);
		url = new URL("http://www.163.com");
		is = url.openStream();
		br = new BufferedReader(new InputStreamReader(is,"GBK"));
		while((temp = br.readLine())!=null){
			bw.write(temp);
			sb.append(temp);
		}
		System.out.println(sb+"/n完成");
	} catch (MalformedURLException e) {
		// TODO 自动生成的 catch 块
		e.printStackTrace();
	} catch (IOException e) {
		// TODO 自动生成的 catch 块
		e.printStackTrace();
	}finally{
		try {
			bw.close();
			fw.close();
			br.close();
			is.close();
		} catch (IOException e) {
			// TODO 自动生成的 catch 块
			e.printStackTrace();
		}
	}

	}

}