这是我正在运行的代码:
import java.io.RandomAccessFile;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
public class Main {
public static void main(String[] args) throws Exception {
String filePath = "D:/temp/file";
RandomAccessFile file = new RandomAccessFile(filePath, "rw");
try {
MappedByteBuffer buffer = file.getChannel().map(FileChannel.MapMode.READ_WRITE, 0, 128);
// Do something
buffer.putInt(4);
} finally {
file.close();
System.out.println("File closed");
}
System.out.println("Press any key...");
System.in.read();
System.out.println("Finished");
}
}
在按下键之前,我试图在FAR Manager中手动删除文件。但是FAR表示该文件已锁定:
The process cannot access the file because it is being used by another process.
Cannot delete the file
D:\temp\file
Object is being opened in:
Java(TM) Platform SE binary (PID: 5768, C:\Program Files\Java\jdk1.8.0_05\bin\javaw.exe)
只有按了一个键后,应用程序才会终止,我可以删除该文件。
我的代码有什么问题?
最佳答案
试试这个。
public class Test
{
public static void main(String[] args) throws Exception {
String filePath = "D:/temp/file";
RandomAccessFile file = new RandomAccessFile(filePath, "rw");
FileChannel chan = file.getChannel();
try {
MappedByteBuffer buffer = chan.map(FileChannel.MapMode.READ_WRITE, 0, 128);
// Do something
buffer.putInt(4);
buffer.force();
Cleaner cleaner = ((sun.nio.ch.DirectBuffer) buffer).cleaner();
if (cleaner != null) {
cleaner.clean();
}
} finally {
chan.close();
file.close();
System.out.println("File closed");
}
System.out.println("Press any key...");
System.in.read();
System.out.println("Finished");
}
}