本文实例讲述了JSP实现远程文件下载保存到服务器指定目录中的方法。分享给大家供大家参考，具体如下：

<%@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);%>

希望本文所述对大家JSP程序设计有所帮助。