Java代码可自动从网络上下载文件

import java.io.BufferedInputStream;
import java.io.FileWriter;
import java.net.URL;

public class DownloadFromNetAddr {

public static void main(String[] args) throws Exception{

boolean istag = download("http://NetAddress", "D:/111.del");

System.out.println(istag);
}

public static boolean download(String urlpath, String savepath){
try{
URL url = new URL(urlpath);
BufferedInputStream in = new BufferedInputStream(url.openStream());
int line1;
StringBuffer sb1 = new StringBuffer();
while((line1=in.read())!=-1){
sb1.append((char)line1);
}
String str1 = sb1.toString();

FileWriter fw = new FileWriter(savepath);
fw.write(str1);
fw.close();
}catch(Exception e){
return false;
}

return true;
}

}