利用RandomAccessFile类将一个文件分割为多个文件(图片)

gistfile1.java

//分割
public static void splitFile(String path,int count) {
		
		try {
			RandomAccessFile raf = new RandomAccessFile(path, "r");
			//文件总大小
			long length = raf.length();
			//每份文件大小
			long maxSize = length / count;
			//最后一份文件大小
			long lastSize = 0L;
			if(length % count != 0) {
				lastSize = length % count;
			}
			
			for (int i = 0; i < count; i++) {
				RandomAccessFile temp = new RandomAccessFile("C:/temp-"+i+".jpg", "rw");
				raf.seek(i * maxSize);
				byte[] buffer ;
				if(i == count-1) {
					buffer = new byte[(int) (maxSize+lastSize)];
				} else {
					buffer = new byte[(int) maxSize];
				}
				int len = raf.read(buffer);
				temp.write(buffer, 0, len);
				temp.close();
			}
			
			raf.close();
			
		} catch (Exception e) {
			e.printStackTrace();
		}
		
		
	}
	
	//合并
	RandomAccessFile allFile = new RandomAccessFile("C:/new.jpg", "rw");
	for (int i = 0; i <= 2; i++) {
		RandomAccessFile raf = new RandomAccessFile("C:/temp-"+i+".jpg", "r");
		byte[] buffer = new byte[1024];
		int len = -1;
		while((len = raf.read(buffer)) != -1) {
			allFile.write(buffer,0,len);
		}
		raf.close();
	}
	
	allFile.close();