JSP实现远程文件下载保存到服务器指定目录中的方法

<%@page import="java.net.*,java.io.*"%><%! public boolean saveUrlAs(String photoUrl, String fileName) {//此方法只能用户HTTP协议  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) {   return false;  } }public String getDocumentAt(String urlString) {//此方法兼容HTTP和FTP协议  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 + "/n");   }   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(); }%><%//测试 String photoUrl = "http://ad4.sina.com.cn/200601/12/43932_750450.jpg"; String fileName = photoUrl.substring(photoUrl.lastIndexOf("/")); String filePath = "C:/test/"; boolean flag = saveUrlAs(photoUrl, filePath + fileName); out.println("Run ok!/n<BR>Get URL file " + flag);%>