用java从网络上抓取HTML文件内容并写入本地文本中

package Tech;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;

public class GetHtmlFile {

/**
* @param args
* @throws IOException
* @throws URISyntaxException
*/
public static void main(String[] args) throws IOException, URISyntaxException {
// TODO Auto-generated method stub
URL url= new URL("http://www.163.com");
InputStream is = url.openStream();
//OutputStream ois= url.openConnection().getOutputStream();
File file = new File(new URI("file:/c:/g3.txt"));
FileOutputStream fos = new FileOutputStream(file);
BufferedOutputStream bos = new BufferedOutputStream(fos);
int ch;
while((ch=is.read())!=-1)
{
bos.write(ch);
bos.flush();
//System.out.print((char)ch);
}

}

}

代码都是些基础代码，不过那个本地File的URI的创建搞了我很长时间，在网上也没搜到啥··

先后试过:

new URI("file://C://g.txt")

Exception:Illegal character in authority

new URI("file://C:/g.txt")

Exception:URI has an authority component

最后试出了结果

new URI("file:/c:/g3.txt")

最后从有关书籍上查得，正解应该是这样的.

URL url = new URL("file://" + realPath); //for Linux
URL url = new URL("file:///" + realPath); //for Windows