JSP实现远程文件下载保存到服务器指定目录中的方法


            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。