Java中使用字节流类读取二进制文件

Posted 2020-10-09 小不懂

package cn.jbit.copy;

import java.io.BufferedInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

public class Test {

	/**
	 * @param args
	 */
	public static void main(String[] args) {

		// 1、创建一个文件对象
		File file = new File("c:\\01.jpg");

		// 2、使用字节流对象读入内存

		try {
			InputStream fileIn = new FileInputStream(file);
			//DataInputStream in = new DataInputStream(fileIn);
			
			// 使用缓存区读入对象效率更快
			BufferedInputStream in = new BufferedInputStream(fileIn);
			
			
			FileOutputStream fileOut = new FileOutputStream("D:\\3.jpg");
			DataOutputStream dataOut = new DataOutputStream(fileOut);
			
			// 使用缓存区写入对象效率更快
			//BufferedOutputStream dataOut=new BufferedOutputStream(fileOut);
			int temp;
			while ((temp = in.read()) != -1) {
				dataOut.write(temp);
			}

		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

	}

}