开发学院WEB开发Jsp 从URL获取文件保存到本地的代码 阅读

从URL获取文件保存到本地的代码

 2008-01-05 18:58:12 来源:WEB开发网   
核心提示:<%@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

  <%@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 = "d:/Ghost/";

   boolean flag = saveUrlAs(photoUrl, filePath + fileName);

   out.println("Run ok!\n
Get URL file " + flag);

  %>

Tags:URL 获取 文件

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