byte数组自动扩容

package com.digican.ztest;

import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;

/**
 * 数组自动扩容；在实际的socket通讯中经常会用到数组自动增加
 * @author yaodaqing
 *
 */
public class TestByte {

	private static final int BUFFER_SIZE = 512;
	
	public static void main(String[] args) {
		try {
			DataInputStream dis = new DataInputStream(new FileInputStream(new File("d:/abc.txt")));
			byte[] b = new byte[BUFFER_SIZE];
			int i = 0;
			int t = 0;
			while((i = dis.read()) != -1){
				//开始：数组自动扩容
				if(t==b.length){
					byte[] temp = new byte[t+1];
					System.arraycopy(b, 0, temp, 0, b.length);
					b = temp;
					temp = null;
				}
				b[t] = (byte)i;
				t++;
				//结束
				
				//此处是处理b的程序。。。
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

}