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测试模板来源于Java 编程思想 P565。测试案例我自己编的，稍微改了架构，变得更加通用些。

package cvfaner.JavaIODemo;import java.io.RandomAccessFile;import java.nio.MappedByteBuffer;import java.nio.channels.FileChannel;public class MappedFileIO {	private static int length = 0x8FFFFFF; 	private MappedByteBuffer fileHandler = null;	public MappedFileIO(String filePath) throws Exception	{		//!SHEN_TODO need shrink to origin file size		fileHandler = new RandomAccessFile(filePath, "rw").getChannel()				.map(FileChannel.MapMode.READ_WRITE, 0, length);			}		public void search(byte[] buf)	{			}		public void insert(int pos, byte[] buf)	{			}		public void remove(int pos, int size)	{			}		public void write(int pos, String buf)	{		write(pos, buf.getBytes());	}		public void write(int pos, byte[] buf)	{		fileHandler.position(pos);		fileHandler.put(buf);	}}

public abstract class Tester {	private String name;	public Tester(String name) { this.name = name; }	public void runTest() {		System.out.print(name + ": ");		try {			test();		}catch(IOException e) {			throw new RuntimeException(e);		}	}	public abstract void test() throws IOException;				/**	 * @param args	 */	public static void main(String[] args) {		// TODO Auto-generated method stub		Tester[] tests = {			new Tester("file write") {				public void test() throws IOException				{					try {						MappedFileIO mappedFileIO  = new MappedFileIO("test.dat");						mappedFileIO.write(0, "Hello moov, I love you.");					} catch (Exception e) {						// TODO Auto-generated catch block						e.printStackTrace();					}				}			}		};		for(Tester test : tests)			test.runTest();	}}

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