JAVA 获取网页源代码保存到本地文件

package httpget;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class demo {
    private String u;
    private String encoding;

    public static void main(String[] args) throws Exception {
    	String url = "http://www.baidu.com/";
        demo client = new demo(url, "gb2312");
        client.run();
    }

    public demo(String u, String encoding) {
        this.u = u;
        this.encoding = encoding;
    }

    public void run() throws Exception {

    	File fp = new File("E:\\zc\\test.txt");
        URL url = new URL(u);
        // 根据链接（字符串格式），生成一个URL对象
        HttpURLConnection urlConnection = (HttpURLConnection) url
                .openConnection();// 打开URL
        BufferedReader reader = new BufferedReader(new InputStreamReader(
                urlConnection.getInputStream(), encoding));
        // 得到输入流，即获得了网页的内容
        String line;
        while ((line = reader.readLine())!= null)
        {
        	addfile(line,fp);
        }

    }

    public void addfile(String line,File fp) throws IOException //追加文件
    {
    	try {
    		String str = "\r\n";
			FileOutputStream af = new FileOutputStream(fp,true);
			af.write(line.getBytes());
			af.write(str.getBytes());

		} catch (FileNotFoundException e)
    	{
			// TODO Auto-generated catch block
			System.out.println("写入失败!");
			e.printStackTrace();
		}
    }

}

　如果不明白上面有些方法的意思可以自己去查API文档