Java 实现 FTP上传下载(转)

r2aj93624j

　　Ｓervlet类：
　　package org.servlet;
　　import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;
　　import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
　　import sun.net.TelnetOutputStream;
import sun.net.ftp.FtpClient;
　　public class FtpServlet extends HttpServlet {
 　private static final long serialVersionUID = 1L;
　 private FtpClient ftpClient;
    public FtpServlet() {
        super();
    }
　　protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 　 　System.getProperties().put("file.encoding", "GBK");
  　　response.setContentType("text/html;charset=UTF-8");
  　　request.setCharacterEncoding("utf-8");
 　　 TelnetOutputStream os = null;
  　　FileInputStream is = null;
  　   try{
　　boolean flag = connectServer(ip, userName, password,savePath);//调用ＦＴＰ连接方法
　　os = ftpClient.put(“abc.txt”);                           //"abc.txt"是用ftp上传后的新文件名
  　　         File file_in = new File(“c:/temp/abc.txt”);       //要上传的文件
  　　        if (file_in.length()==0) {
   　　　          return ;
  　　        }
  　　       is = new FileInputStream(file_in);
 　　        byte[] bytes = new byte[1024];
  　　       int c;
  　　       while ((c = is.read(bytes)) != -1) {
    　　　　       os.write(bytes, 0, c);　　　　　　　　//开始写
  　          }
   
          }catch (FileNotFoundException e1) {
                     e1.printStackTrace();
          }catch (IOException e1) {
                 e1.printStackTrace();
          } catch (FileUploadException e) {
                  e.printStackTrace();
          }finally {
                   if (is != null) {
                         is.close();
                   }
                  if (os != null) {
                         os.close();
                  }
                if (ftpClient != null) {
                       ftpClient.closeServer();
                }
          }
  }
　　
 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  doGet(request,response);
 }
 
 
 //连接ftp服务器
 private boolean connectServer(String ip, String user, String password,String path) throws IOException {
  
     // server：FTP服务器的IP地址；user:登录FTP服务器的用户名;password：登录FTP服务器的用户名的口令；path：FTP服务器上的 路径
      try{
            ftpClient = new FtpClient();
            ftpClient.openServer(ip);
   
           ftpClient.login(user, password);
   
            if (path.length()!= 0){          //path是ftp服务下主目录的子目录
                     ftpClient.cd(path);
            }
             ftpClient.binary();              //用2进制上传
           return true;
        }catch(IOException e){
            e.printStackTrace();
           return false;
       }
   }
　　
　　//FTP文件下载
　　public void download(){
　　connectServer(ip, userName, password,savePath);
              String fileName = request.getParameter("filename");
             try{
                   ftpIn = ftpClient.get(fileName);            //fileName为FTP服务器上要下载的文件名
                   byte[] buf = new byte[204800];
                  int bufsize = 0;
                  ftpOut = new FileOutputStream(path+"/"+fileName);              //存放在本地硬盘的物理位置
                  while ((bufsize = ftpIn.read(buf, 0, buf.length)) != -1) {
                              ftpOut.write(buf, 0, bufsize);
　　}
             }catch(Exception e){
                  e.printStackTrace();
            }finally{
                   if (ftpIn != null) {
                              ftpIn.close();
                     }
                   if (ftpOut != null) {
                              ftpOut.close();
                     }
                   if (ftpClient != null) {
                           ftpClient.closeServer();
                    }
           }
      }
}