JAVA读取FTP文件并转为字符串

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从FTP服务器读取文件，并以字符串形式输出内容吐舌头

其中包含了FTP读文件与文件转字符串两方面，需要的朋友自己拆分功能吐舌头

本代码依赖commons-net-3.4.jar，请自行度娘下载

ReadFile.java

package com.crm.util;import java.io.BufferedReader;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStreamReader;import java.io.OutputStream;import java.net.SocketException;import org.apache.commons.net.ftp.FTPClient;import org.apache.commons.net.ftp.FTPFile;import org.apache.commons.net.ftp.FTPReply;/** * @author DingJiaCheng * 读取文件，转为字符串 * */public class ReadFile {public static String read(String path,String ftpuser,String ftppwd) {if(path.contains("ftp:") || path.contains("FTP:")){String ftppath = path.substring(19,43);            //暂时写死String localPath="C:\\Program Files\\hwlogstemp\\";int reply;FTPClient ftp = new FTPClient();try {ftp.connect(path.substring(6,18));             //暂时写死//2.登录服务器 如果采用默认端口，可以使用ftp.connect(url)的方式直接连接FTP服务器  ftp.login(ftpuser, ftppwd);  //3.判断登陆是否成功  reply = ftp.getReplyCode();  if (!FTPReply.isPositiveCompletion(reply)) {      ftp.disconnect();}ftp.changeWorkingDirectory(ftppath);// 转移到FTP服务器目录              //5.遍历下载的目录              FTPFile[] fs = ftp.listFiles();              for (FTPFile ff : fs) {                  //解决中文乱码问题，两次解码                  byte[] bytes=ff.getName().getBytes("iso-8859-1");                  String fn=new String(bytes,"utf8");                  if(fn.contains("json")){                    //6.写操作，将其写入到本地文件中                      File localFile = new File(localPath + "temp.json");                      OutputStream is = new FileOutputStream(localFile);                      ftp.retrieveFile(ff.getName(), is);                      is.close();                }            }             ftp.logout();path = localPath + "temp.json";            } catch (SocketException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}finally{if (ftp.isConnected()){try {ftp.disconnect();} catch (IOException e) {}}}                            }BufferedReader reader = null;String laststr = "";try {FileInputStream fileInputStream = new FileInputStream(path);InputStreamReader inputStreamReader = new InputStreamReader(fileInputStream, "gb2312");reader = new BufferedReader(inputStreamReader);String tempString = null;while ((tempString = reader.readLine()) != null) {laststr += tempString;}reader.close();} catch (IOException e) {e.printStackTrace();} finally {if (reader != null) {try {reader.close();} catch (IOException e) {e.printStackTrace();}}}return laststr;}public static void main(String[] args) {String path = "ftp://123.123.123.123/abcde/defghi.txt";String res = read(path,"username","password");System.out.println(read(path));}

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