Java 实现 FTP上传下载(转)_JAVA_编程开发_程序员俱乐部

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();
?????????????????? ?}
???????? ??}
??? ??}
}