java讀取ftp中TXT檔案的案例
阿新 • • 發佈:2020-09-24
最近在開發關於java讀取ftp中TXT檔案,其中有些坑踩了一下,再次做個記錄
1、讀取檔案時我會根據檔名稱去生成資料庫表,oracle資料庫對於表名的長度是有限制的,最多30個字元
2、對於多個檔案的ftp的讀取,每次獲取檔案後再次回去檔案的流會為空,即在迴圈中多次根據ftp獲取檔案的流
當出現這種情況時,需要在迴圈時每次開啟和關閉ftp的連結即可解決,否則在第二次獲取的時候inputsteam為null
3、讀取txt檔案時,如果檔案中包含中文,進行讀取時可能會出現亂碼,這是可設定讀取的字符集為UTF-8,如果不行,再試試
GB2312
4、java讀取TXT檔案:
InputStreamReader reader = new InputStreamReader(is,"GB2312"); BufferedReader br = new BufferedReader(reader); String lineTxt = null; //每行資料 int rowNum = 0; while ((lineTxt = br.readLine()) != null) {}
補充知識:Java實現從FTP獲取檔案下載到本地,並讀取檔案中的內容的成功方法
我就廢話不多說了,大家還是直接看程式碼吧~
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物件 private FTPClient ftp; //需要連線到的ftp端的ip private String ip = "10.46.249.7"; //連線埠,預設21 private int port = 21; //要連線到的ftp端的名字 private String name = "DKEDI"; //要連線到的ftp端的對應得密碼 private String pwd = "P@ssw0rd"; //呼叫此方法,輸入對應得ip,埠,要連線到的ftp端的名字,要連線到的ftp端的對應得密碼。連線到ftp物件,並驗證登入進入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(); } } // 下載檔案到本地 public boolean download(FTPFile file) throws Exception { boolean result = true; // 本地檔案路徑 File f = new File("E:\\crmFiles\\"); if (!f.exists()) { f.getParentFile().mkdirs(); } long lRemoteSize = file.getSize(); try {// 下載過的不在下載了 OutputStream out = new FileOutputStream(f); if (f.length() >= lRemoteSize) { System.out.println("~~~~~~~~~~~~~~~~~~~~~~~~本地已經存在,下載中止"); out.flush(); out.close(); } boolean iss = ftp.retrieveFile(file.getName(),out); System.out.println("~~~~~~~~~~~~~~~~~~~~~~~~下載成功\r\n"); out.close(); } catch (Exception ex) { ex.printStackTrace(); System.out.println("~~~~~~~~~~~~~~~~~~~~~~~~下載失敗\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("訂單內容為------------------>>>>> "+FileContent+" <<<<<------------------"); } catch (FileNotFoundException e) { System.out.println("!!!!!!!!!!!!!!!!!沒有找到合適的訂單資訊!!!!!!!!!!!!!!!"); 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("遠端路徑為*************************"+remote); FTPFile[] files = ftp.listFiles(remote); // 通過路徑得到檔案 System.out.println("檔案數量為*************************"+files.length); for (int i = 0; i < files.length; i++) { FTPFile file = files[i]; if (file.isFile()) { downloadResult = this.download(file);// 下載檔案 到本地讀取路徑 if (downloadResult) { String ordertype = this.preRead("E:\\crmFiles\\"); } /*//讀取檔案內容,將內容存資料庫 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("************* 檔案不存在 ************"); } } } catch (Exception e) { e.printStackTrace(); } } @Override public String threeDAndEightDReports(String orderNum,String FTPUrl,String FileType) { //抱怨單號、FTP地址、3D/8D檔案型別 System.out.println("1-------------"+orderNum); System.out.println("2-------------"+FTPUrl); System.out.println("3-------------"+FileType); if(null != orderNum && null != FTPUrl && null != FileType){ //連線FTP boolean flag = this.ftp1(); if(flag){ try { //獲取檔案、解析檔案內容,進庫操作 this.gmRead(FTPUrl); // 關閉連線 this.disconnect(); } catch (Exception e) { e.printStackTrace(); } }else{ System.out.println("!!!!!!!!!!!!!!!!!FTP連線失敗!!!!!!!!!!!!!!!!!"); } return "success"; }else{ return "fail"; } } public static void main(String[] args) { QualityComplainServicesImpl q = new QualityComplainServicesImpl(); q.threeDAndEightDReports("001","/CRMINTERFACE","3D"); } }
以上這篇java讀取ftp中TXT檔案的案例就是小編分享給大家的全部內容了,希望能給大家一個參考,也希望大家多多支援我們。