通过ftp模拟网盘-白红宇

通过ftp模拟网盘

阅读量：4971 次

发布时间：2019-06-12

本文共 4402 字，大约阅读时间需要 14 分钟。

package com.xiaomo.ftp.down_upload;

import java.io.IOException;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import org.apache.commons.net.ftp.FTPClient;

import org.apache.commons.net.ftp.FTPFile;

import org.apache.commons.net.ftp.FTPReply;

一、建立一个类，用来获取ftp对应目录下的目录和文件信息。

public class ListMapFtp {

public static List<Map> showList(String hostname,int port,String username,String password,String pathname) throws IOException{

FTPClient ftpClient = new FTPClient();

List<String> list = new ArrayList<String>();

List<Map> listMap = new ArrayList<Map>();

Map<String, String> mapFile = new HashMap<String, String>();

Map<String, String> mapDirectory = new HashMap<String, String>();

try{

int reply;

ftpClient.connect(hostname, port);

ftpClient.login(username, password);

reply = ftpClient.getReplyCode();

if(!FTPReply.isPositiveCompletion(reply)){

ftpClient.disconnect();

}

ftpClient.changeWorkingDirectory(pathname+"/");

FTPFile[] ftpFiles = ftpClient.listFiles();

for(FTPFile ftpFile:ftpFiles){

if(ftpFile.getType()==1&&!ftpFile.getName().equals(".")&&!ftpFile.getName().equals("..")){

list.add(pathname+"/"+ftpFile.getName());

mapDirectory.put(ftpFile.getName(), pathname+"/"+ftpFile.getName());

}

for(FTPFile ftpFile:ftpFiles){

if(ftpFile.getType()==0){

list.add(ftpFile.getName());

}

listMap.add(mapDirectory);

listMap.add(mapFile);

ftpClient .logout();

} finally {

if (ftpClient.isConnected()) {

try {

ftpClient.disconnect();

} catch (IOException ioe) {

ioe.printStackTrace();

}

return listMap;

}

二、建立一个servlet类，通过网页显示对应的ftp目录和文件信息

package com.xiaomo.ftp.down_upload;

import java.io.IOException;

import java.io.PrintWriter;

import java.util.List;

import java.util.Map;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

public class ServletFtp extends HttpServlet {

ListMapFtp listMapFtp = null;

DownloadFtp downloadFtp = null;

public void service(HttpServletRequest request,HttpServletResponse response)

throws ServletException ,IOException{

String appPath = request.getContextPath();//获得当前项目的相对路径

HttpSession session = request.getSession();

String remotePath = request.getParameter("remotePath");//获得当前路径

if(remotePath!=null){

System.out.println("remotePath:"+remotePath);

session.setAttribute("sessionPath", remotePath);//将当前路径保存到session中

}

if(remotePath==null){

remotePath = "";

}

String filename = request.getParameter("filename");//获得当前文件的名称

if(filename!=null){

System.out.println("filename: "+filename);

}

listMapFtp = new ListMapFtp();

List<Map> list = listMapFtp.showList("192.168.**.**", 21, "*****", "******",remotePath);//获得ftp对应路径下的所有目录和文件信息

Map<String,String> mapDirectory = list.get(0);//获得ftp该路径下的所有目录信息

Map<String,String> mapFile = list.get(1);//获得ftp该路径下所有的文件信息

PrintWriter out = response .getWriter();

out.print("<html><head><title>信息提示页</title></head><body>");

out.print("<a style='color:red' href='http://localhost:8080/xiaomo/ftpList?remotePath='>首页</a><br/><br/>");

if(remotePath!=null&&filename==null){//如果前台点击的是目录则显示该目录下的所有目录和文件

if(mapDirectory.size()>1){

//out.println("<h3>目录</h3>");

for(String str : mapDirectory.keySet()){

out.print("<img src='"+appPath+"/pic/directory.jpg' width='25px' height='25px'>&nbsp<a style='color:blue' href='http://localhost:8080/xiaomo/ftpList?remotePath="+mapDirectory.get(str)+"'>"+str+"</a><br/>");

}

if(mapFile.size()>1){

//out.println("<h3>文件</h3>");

for(String str : mapFile.keySet()){

out.print("<img src='"+appPath+"/pic/file.jpg' width='20px' height='20px'>&nbsp<a style='color:green' href='http://localhost:8080/xiaomo/ftpList?filename="+mapFile.get(str)+"'>"+str+"</a><br/>");

}

}else if(filename!=null){//如果前台点击的是文件，则下载该文件

downloadFtp = new DownloadFtp();

String sessionPath = (String) session.getAttribute("sessionPath");//获得保存在session中的当前路径信息

System.out.println("session--->sessionPath"+sessionPath);

downloadFtp.downFile("192.168.50.23", 21, "admin", "123456",sessionPath,filename, "D:/test/download/");

//调用方法下载该文件

out.println("<h3>"+filename+" 下载成功！</h3>");

out.print("<a style='color:blue' href='http://localhost:8080/xiaomo/ftpList?remotePath="+sessionPath+"'>返回</a><br/>");

}

out.print("</body></html>");

}