请问如何吧这个程序的结果输出到一个txt文件中啊？

[xiars123]

package URLUtil;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class URLUtil {

public static String getHtml(String urlString) {
try {
StringBuffer html = new StringBuffer();
URL url = new URL(urlString);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
InputStreamReader isr = new InputStreamReader(conn.getInputStream());
BufferedReader br = new BufferedReader(isr);
String temp;
while ((temp = br.readLine()) != null) {
html.append(temp).append("\n");
}
br.close();
isr.close();
return html.toString();
} catch (Exception e) {
e.printStackTrace();
return null;
}
}


public static void main(String[] args) {
FilterTags ft = new FilterTags();

System.out.println(ft.getFilterTags(URLUtil.getHtml("http://www.baidu.com")));

}
}

[lh_fengyuzhe]

BufferedWriter bw = new BufferedWriter(new FileWriter("a.txt"));
bw.write(ft.getFilterTags(URLUtil.getHtml("http://www.baidu.com")));

[xiars123]

我把楼上说的用到了main中，但是txt文件里还是没有结果，请问这是怎么回事？

[hy158753228]

随手写了个：

package csdn.impulsehu.may;

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

public class URLUtil {
	public static void main(String[] args) {
		pageContentToLocalFile("http://www.baidu.com", new File("baidu.txt"));
	}
	
	public static void pageContentToLocalFile(String sourceUrl, File destFileName) {
		URL url = null;
		InputStream is = null;
		BufferedReader br = null;
		FileWriter fw = null;
		BufferedWriter bw = null;
		try {
			url = new URL(sourceUrl);
			is = url.openConnection().getInputStream();
			br = new BufferedReader(new InputStreamReader(is));			
			if(destFileName != null) {
				fw = new FileWriter(destFileName);
			} else {
				fw = new FileWriter(new File("temp.tmp"));
			}
			bw = new BufferedWriter(fw);
			
			String line;
			while(null != (line = br.readLine())) {
				System.out.println(line);
				bw.write(line);
				bw.newLine();
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			closeIOStream(bw, fw, br, is);			
		}
		
	}

	private static void closeIOStream(BufferedWriter bw, FileWriter fw,
			BufferedReader br, InputStream is) {
		if(null != bw) {
			try {
				bw.close();
			} catch (IOException e) {
				e.printStackTrace();
			} finally {
				if(null != fw) {
					try {
						fw.close();
					} catch (IOException e) {
						e.printStackTrace();
					} finally {
						if(null != br) {
							try {
								br.close();
							} catch (IOException e) {
								e.printStackTrace();
							} finally {
								if(null != is) {
									try {
										is.close();
									} catch (IOException e) {
										e.printStackTrace();
									}
								}
							}
						}
					}
				}
			}
		}
	}

}

[xiars123]

晕，原来是之前的忘记加bw.close()...
也谢谢楼上的帮忙，csdn都是活雷锋！