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。