最近在开发关于java读取ftp中TXT文件,其中有些坑踩了一下,再次做个记录
1、读取文件时我会根据文件名称去生成数据库表,oracle数据库对于表名的长度是有限制的,最多30个字符
2、对于多个文件的ftp的读取,每次获取文件后再次回去文件的流会为空,即在循环中多次根据ftp获取文件的流
当出现这种情况时,需要在循环时每次开启和关闭ftp的链接即可解决,否则在第二次获取的时候inputsteam为null
3、读取txt文件时,如果文件中包含中文,进行读取时可能会出现乱码,这是可设置读取的字符集为UTF-8,如果不行,再试试
GB2312
4、java读取TXT文件:
InputStreamReader reader = new InputStreamReader(is, "GB2312"); BufferedReader br = new BufferedReader(reader); String lineTxt = null; //每行数据 int rowNum = 0; while ((lineTxt = br.readLine()) != null) {}
补充知识:Java实现从FTP获取文件下载到本地,并读取文件中的内容的成功方法
我就废话不多说了,大家还是直接看代码吧~
package com.aof.web.servlet; import java.io.BufferedReader; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStreamReader; import java.io.OutputStream; import javax.jws.WebService; import org.apache.commons.net.ftp.FTPClient; import org.apache.commons.net.ftp.FTPFile; @WebService(endpointInterface="com.aof.web.servlet.QualityComplainServices") public class QualityComplainServicesImpl implements QualityComplainServices { //ftp对象 private FTPClient ftp; //需要连接到的ftp端的ip private String ip = "10.46.249.7"; //连接端口,默认21 private int port = 21; //要连接到的ftp端的名字 private String name = "DKEDI"; //要连接到的ftp端的对应得密码 private String pwd = "P@ssw0rd"; //调用此方法,输入对应得ip,端口,要连接到的ftp端的名字,要连接到的ftp端的对应得密码。连接到ftp对象,并验证登录进入fto public boolean ftp1() { ftp = new FTPClient(); try { // ftp.connect(ip, port); if(!ftp.isConnected()){ ftp.connect(ip, port); } System.out.println(ftp.login(name, pwd)); // ftp.setCharset(Charset.forName("UTF-8")); ftp.setControlEncoding("UTF-8"); return true; } catch (IOException e) { e.printStackTrace(); return true; } } public void disconnect() throws Exception { if (ftp.isConnected()) { ftp.disconnect(); } } // 下载文件到本地 public boolean download(FTPFile file) throws Exception { boolean result = true; // 本地文件路径 File f = new File("E:\\crmFiles\\"); if (!f.exists()) { f.getParentFile().mkdirs(); } long lRemoteSize = file.getSize(); try {// 下载过的不在下载了 OutputStream out = new FileOutputStream(f); if (f.length() >= lRemoteSize) { System.out.println("~~~~~~~~~~~~~~~~~~~~~~~~本地已经存在,下载中止"); out.flush(); out.close(); } boolean iss = ftp.retrieveFile(file.getName(), out); System.out.println("~~~~~~~~~~~~~~~~~~~~~~~~下载成功\r\n"); out.close(); } catch (Exception ex) { ex.printStackTrace(); System.out.println("~~~~~~~~~~~~~~~~~~~~~~~~下载失败\r\n"); return false; } return result; } private InputStreamReader read; private BufferedReader reader; private String preRead(String filepath) throws Exception { File file = new File(filepath); String ordertype = null; if (file.isFile() && file.exists()) { try { read = new InputStreamReader(new FileInputStream(file), "GBK"); reader = new BufferedReader(read); StringBuffer FileContent = new StringBuffer(); String temp = null; while ((temp = reader.readLine()) != null) { FileContent.append(temp); } System.out.println("订单内容为------------------>>>>> "+FileContent+" <<<<<------------------"); } catch (FileNotFoundException e) { System.out.println("!!!!!!!!!!!!!!!!!没有找到合适的订单信息!!!!!!!!!!!!!!!"); e.printStackTrace(); } finally { reader.close(); read.close(); // file.delete(); } } return ordertype; } public void gmRead(String remote) throws Exception { boolean downloadResult = false; try { ftp.changeWorkingDirectory(remote); System.out.println("远程路径为*************************"+remote); FTPFile[] files = ftp.listFiles(remote); // 通过路径得到文件 System.out.println("文件数量为*************************"+files.length); for (int i = 0; i < files.length; i++) { FTPFile file = files[i]; if (file.isFile()) { downloadResult = this.download(file);// 下载文件 到本地读取路径 if (downloadResult) { String ordertype = this.preRead("E:\\crmFiles\\"); } /*//读取文件内容,将内容存数据库 InputStreamReader isr = new InputStreamReader(new FileInputStream(file), "utf-8"); BufferedReader br = new BufferedReader(isr); String lineTxt = null; while ((lineTxt = br.readLine()) != null) { lineTxt+=lineTxt; } System.out.println(lineTxt); br.close();*/ }else{ System.out.println("************* 文件不存在 ************"); } } } catch (Exception e) { e.printStackTrace(); } } @Override public String threeDAndEightDReports(String orderNum, String FTPUrl, String FileType) { //抱怨单号、FTP地址、3D/8D文件类型 System.out.println("1-------------"+orderNum); System.out.println("2-------------"+FTPUrl); System.out.println("3-------------"+FileType); if(null != orderNum && null != FTPUrl && null != FileType){ //连接FTP boolean flag = this.ftp1(); if(flag){ try { //获取文件、解析文件内容,进库操作 this.gmRead(FTPUrl); // 关闭连接 this.disconnect(); } catch (Exception e) { e.printStackTrace(); } }else{ System.out.println("!!!!!!!!!!!!!!!!!FTP连接失败!!!!!!!!!!!!!!!!!"); } return "success"; }else{ return "fail"; } } public static void main(String[] args) { QualityComplainServicesImpl q = new QualityComplainServicesImpl(); q.threeDAndEightDReports("001","/CRMINTERFACE","3D"); } }
以上这篇java读取ftp中TXT文件的案例就是小编分享给大家的全部内容了,希望能给大家一个参考,也希望大家多多支持脚本之家。