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这是我的代码,它使用ExecutorService
将文件从一个目录复制到另一个目录,但事实证明它比顺序操作慢。我正在使用未同步的apache FileUtils copyFile方法。有什么问题?ExecutorService比复制文件的顺序文件进程慢
public class ExecutorService {
private static java.util.concurrent.ExecutorService pool;
public ExecutorService() {
pool = Executors.newFixedThreadPool(20);
}
public static void main(String arg[]) {
long a = System.currentTimeMillis();
new ExecutorService();
List<File> listFiles = null;
try {
listFiles = FileUtility.getFileNamesToExtract(new File(
"C:/Users/User/Desktop/XSLT Source/Input XML"));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
for (int i = 0; i < listFiles.size(); i++)
pool.submit(new FileTransfer(listFiles.get(i), i));
pool.shutdown();
try {
pool.awaitTermination(Long.MAX_VALUE, TimeUnit.NANOSECONDS);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
long b = System.currentTimeMillis();
System.out.println((b - a)/1000);
}
}
public class FileTransfer implements Runnable{
private File file = null;
private int num = 0;
public FileTransfer(File file, int i) {
this.file = file;
this.num = i;
}
@Override
public void run() {
try {
System.out.println("Processing="+file.getName());
FileUtils.copyFile(file, new File("C:/Users/gursahibsahni/Desktop/thread pool files/"+num+"_"+file.getName()+num));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
好吧,先生!谢谢(你的)信息! –