import java.io.*;
import java.util.List;
import java.util.concurrent.CountDownLatch;

/**
 * 多線程讀取多個文件
 */
public class FileThread extends Thread{

 private final CountDownLatch countDownLatch = new CountDownLatch(10);
 private int fileIndex;
 private List<String> filelist;
 private String filepath = "D:\\LocalFtpServer\\data20181229\\";
 private String movepath = "D:\\LocalFtpServer\\data20181229_01\\";

 public int getFileIndex() {
  return fileIndex;
 }

 public void setFileIndex(int fileIndex) {
  this.fileIndex = fileIndex;
 }

 public List<String> getFilelist() {
  return filelist;
 }

 public void setFilelist(List<String> filelist) {
  this.filelist = filelist;
 }

 @Override
 public void run() {

  for (int i = 0; i < filelist.size(); i++) {
   if (i % 10 == fileIndex) {
    //讀取文件
    File readfile = new File(filepath + filelist.get(i));
    InputStreamReader isr = null;
    try {
     isr = new InputStreamReader(new FileInputStream(readfile), "UTF-8");
     BufferedReader reader = new BufferedReader(isr);
     String line = null;
     // 一次讀入一行，直到讀入null為文件結束
     while ((line = reader.readLine()) != null) {
      System.out.println(line );
     }
     reader.close();
     isr.close();
    } catch (UnsupportedEncodingException e) {
     e.printStackTrace();
    } catch (IOException e) {
     e.printStackTrace();
    }
    //讀取完后， 移動文件位置
    readfile.renameTo(new File(movepath + readfile.getName()));
   }
  }
  countDownLatch.countDown();
 }
}

 public static void main(String[] args) throws IOException {
 String filepath = "D:\\LocalFtpServer\\data20181229\\";
 File file = new File(filepath);
 //讀取目錄下所有文件
 String[] filelist = file.list();
 List<String> fList=new ArrayList<String>();

 for (int i = 0; i < filelist.length; i++) {
 if (filelist[i].startsWith("data") && filelist[i].endsWith(".txt")) {
  fList.add(filelist[i]);
 }
 }
 for(int i=0;i<30;i++){
 FileThread fileThread=new FileThread();
 fileThread.setFileIndex(i);
 fileThread.setFilelist(fList);
 fileThread.start();
 }
 countDownLatch.await();
}