我试图在读取时专门锁定文件。
我在Windows 7上使用Java 7.
文件被复制到一个目录,然后我想在复制后正确读取它们。这就是为什么我在读取时专门尝试锁定文件的原因。
但我的程序在中间读取文件。 有人可以帮我这个吗?谢谢!
package test;
import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.channels.FileChannel;
import java.nio.channels.FileLock;
import java.nio.file.FileSystem;
import java.nio.file.FileSystems;
import java.nio.file.Files;
public class FileLockMove {
public static void main(String[] args) {
FileSystem fs = FileSystems.getDefault();
File dir = new File("c:/test_source/");
while(true){
for (File file : dir.listFiles()) {
try (FileChannel fc = (new RandomAccessFile(file, "rw")).getChannel()){
FileLock lock = fc.tryLock();
if(lock != null){
System.out.println("lock is not null\t" + file.getName());
System.out.println("addBody: " + file.getAbsolutePath() + "\t" + file.length());
}else{
System.out.println("lock is null\t" + file.getName());
continue;
}
} catch (Exception e) {
System.out.println("fail:" + file.getName()+"\t" + e.getMessage());
}
try {
Files.move(file.toPath(), fs.getPath("c:/test_dest/",file.getName()));
} catch (IOException e) {
e.printStackTrace();
}
}
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
最初,复制文件不是Java,但我慢慢创建了我的程序副本,以确认我可以完全锁定。
package test;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FilenameFilter;
public class FileCopySlow{
public static void main(String[] args) {
String source = "C:/test_orig/";
String dst ="C:/test_source/";
File file = new File(source);
File[] files = file.listFiles(new FilenameFilter() {
@Override
public boolean accept(File dir, String name) {
if(name.matches(".*\\.bmp")){
return true;
}
return false;
}
});
for(File f: files){
copyStream(f, dst);
}
}
static void copyStream(File source,String dst){
try(BufferedInputStream br = new BufferedInputStream(new FileInputStream(source))){
BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(dst+source.getName()));
byte[] buff = new byte[100];
int len = -1;
while((len = br.read(buff)) >-1){
out.write(buff,0,len);
out.flush();
Thread.sleep(100);
}
out.close();
System.out.println(source.getName() + "\tfinish");
}catch(Exception e){
e.printStackTrace();
}
}
}