Java——IO流(文件分割)_8

package RandTest_11;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;

import java.io.RandomAccessFile;

public class RandTest_3 {
	public static void main(String[] args) throws IOException {
			File src = new File("a.html");
			long len = src.length();	//总长度
			int blockSize = 1024;		//块大小
			int size = (int) Math.ceil((len*1.0/blockSize));	//块个数
			System.out.println(size);
			
			int beginPos = 0;			//起始位置
			int actualSize; 	//实际大小
			
			for(int i = 0 ; i<size;i++) {
				beginPos = i * blockSize;
				if(i==size-1) {
					actualSize = (int)len;
				}else {
					actualSize = blockSize;
					len-=actualSize;
				}
				System.out.println(i+"-->"+beginPos+"-->"+actualSize);
				split(beginPos, actualSize);
			}
			
			
	}
	public static void split(int beginPos,int actualSize) throws IOException {
		RandomAccessFile raf = new RandomAccessFile(new File("a.html"), "r");
//		System.out.println(raf.length());
		raf.seek(beginPos);		//设置起始位置
		byte[] datas = new byte[1024];	//缓冲容器
		int len = -1;
		while((len=raf.read(datas))!=-1) {			
			if(actualSize>len) { //获取本次读取的所有内容
				System.out.println(new String(datas,0,len,"UTF-8"));
				actualSize -=len;
//				System.out.println("测试");
			}else { 
				System.out.println(new String(datas,0,actualSize,"UTF-8"));
				break;
			}
		}
		raf.close();
	}
}