java远程读取文件

import java.net.*;
import java.io.*;

public class TestUrl {

public boolean saveUrlAs(String photoUrl, String fileName) {
     try {
      URL url = new URL(photoUrl);
      HttpURLConnection connection = (HttpURLConnection) url
        .openConnection();
      DataInputStream in = new DataInputStream(connection
        .getInputStream());
      DataOutputStream out = new DataOutputStream(new FileOutputStream(
        fileName));
      byte[] buffer = new byte[4096];
      int count = 0;
      while ((count = in.read(buffer)) > 0) {
       out.write(buffer, 0, count);
      }
      out.close();
      in.close();
      return true;

     } catch (Exception e) {
      System.out.println(e);
      return false;
     }
    }
    /**
     * 兼容HTTP和FTP协议
     * @param urlString
     * @return
     */
    public String getDocumentAt(String urlString) {
     StringBuffer document = new StringBuffer();

     try {

      URL url = new URL(urlString);
      URLConnection conn = url.openConnection();
      BufferedReader reader = new BufferedReader(new InputStreamReader(
        conn.getInputStream()));
      String line = null;
      while ((line = reader.readLine()) != null) {
       document.append(line + " ");
      }
      reader.close();
     } catch (MalformedURLException e) {
      System.out.println("Unable to connect to URL: " + urlString);
     } catch (IOException e) {
      System.out.println("IOException when connecting to URL: "
        + urlString);
     }
     return document.toString();
    }

   
    public static void main(String[] args) {
     TestUrl test = new TestUrl();
     String photoUrl = "http://211.154.131.211/xml/nvisio.xml";
     String fileName = photoUrl.substring(photoUrl.lastIndexOf("/"));
     String filePath = "d:\";
     boolean flag = test.saveUrlAs(photoUrl, filePath + fileName);
     System.out.println("Run ok! Get URL file " + flag);
    }

   }