java – 在Android下取消映射或“释放”MappedByteBuffer

但是有一些帮助器和代码片段使得对于mmap文件的C-Java绑定变得容易/容易：

> util-mmap,Apache License 2.0,here是有关Android支持的问题
> Using Memory Mapped Files and JNI to communicate between Java and C++ programs或更简单的工具,如javacpp？
看起来tomcat有实现a helper (jni.MMap),能够取消/删除一个mmap文件

看到util-mmap在行动,真的很容易：

public class MMapTesting {

    public static void main(String[] args) throws IOException {
        File file = new File("test");
        MMapBuffer buffer = new MMapBuffer(file,1000,FileChannel.MapMode.READ_WRITE,ByteOrder.BIG_ENDIAN)) {
            buffer.memory().intArray(0,100).set(2,234);
        // calls unmap under the hood
        buffer.close();

        // here we call unmap automatically at the end of this try-resource block 
        try (MMapBuffer buffer = new MMapBuffer(file,ByteOrder.BIG_ENDIAN)) {
            System.out.println("length: " + buffer.memory().length());
            IntArray arr = buffer.memory().intArray(0,buffer.memory().length() / 8);
            // prints 234
            System.out.println(arr.get(2));
        }
    }
}