如何使用Java讀取Web頁面

如何使用Java讀取Web頁面：

1. import static java.lang.System.out;
3. import java.io.BufferedReader;
4. import java.io.BufferedWriter;
5. import java.io.FileWriter;
6. import java.io.IOException;
7. import java.io.InputStream;
8. import java.io.InputStreamReader;
9. import java.net.URL;
12. public class HtmlHelper {
14. private static String urlstring = "http://www.csdn.net";
15. private static String filename = "C:/tmp/csdn.html";
17. public static void main(String[] args){

1. //comment out the following section to add proxy server support

1. //System.setProperty("http.proxyHost",conf.proxyhost);
2. //System.setProperty("http.proxyPort",conf.proxyport);
4. InputStream is = null;
5. BufferedReader br = null;
6. BufferedWriter bw = null;
7. try {
8. out.println("Downloading html page from " + urlstring);
9. URL url = new URL(urlstring);
10. is = url.openStream(); // throws an IOException
11. br = new BufferedReader(new InputStreamReader(is));
12. bw = new BufferedWriter(new FileWriter(filename));
13. String line = null;
14. while ((line = br.readLine()) != null) {
15. bw.write(line);
16. bw.newLine();
17. }
18. bw.flush();
19. out.println("Downloaded to " + filename);
20. } catch (IOException ioe) {
21. ioe.printStackTrace();
22. } finally {
23. try {if (is != null) {is.close();}} catch (IOException ignore) {}
24. try {if (br != null) {br.close();}} catch (IOException ignore) {}
25. try {if (bw != null) {bw.close();}} catch (IOException ignore) {}
26. }
27. }
28. }