ByteArrayInputStream和ByteArrayOutputStream的使用

ByteArrayInputStream需要绑定数据源

ByteArrayInputStream bais=new ByteArrayInputStream(fileByteArray);//fileByteArray为字节数组

ByteArrayOutputStream则不需要绑定数据输出目标:

ByteArrayOutputStream baos= new ByteArrayOutputStream();

进行ByteArrayInputStream和ByteArrayOutputStream的使用,示例代码如下:

package com.wd.IO;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

/**
 * 测试字节数组输入(ByteArrayInputStream)和字节数组输出(ByteArrayOutputStream)
 * 将文件输入流转化为字节数组  
 * 将字节数组输出为文件
 * @author Steven
 *
 */
public class TestByteArrayIO {
	public static void main(String[] args) {
//		TestByteArrayIO.TestBis();
		byte[] testBos = TestByteArrayIO.TestBos();
		TestByteArrayIO.TestBis(testBos);
//		System.out.println(testBos.length);
	}
	
	/*
	 * 测试ByteArrayInputStream
	 * 将字节数组输出到文件
	 * 由控制台进行键盘输入直接输出到文件中保存
	 */
	public static void TestBis(byte[] fileByteArray){
//		BufferedReader SysIn = new BufferedReader(new InputStreamReader(System.in));
		int len=-1;
		byte[] flush= new byte[1024];
		try(/*ByteArrayInputStream bais=new ByteArrayInputStream("assfgghhjkddsdfs".getBytes());*/
				ByteArrayInputStream bais=new ByteArrayInputStream(fileByteArray);
				/*ByteArrayInputStream bais=new ByteArrayInputStream(SysIn.readLine().getBytes());*/
				BufferedOutputStream bos=new BufferedOutputStream(new FileOutputStream("C:/Users/Steven/Desktop/1-copy.jpg",true))){
			while((len=bais.read(flush))!=-1){
				bos.write(flush, 0, len);
			}
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		
	}
	
	/*
	 * 测试ByteArrayOutputStream
	 * 将文件转化为字节数组
	 */
	public static byte[] TestBos(){
		byte[] flush=new byte[1024];
		int len=-1;
		try(BufferedInputStream bis=new BufferedInputStream(
				new FileInputStream("C:/Users/Steven/Desktop/1.jpg"));
			ByteArrayOutputStream baos= new ByteArrayOutputStream();){
			while((len=bis.read(flush))!=-1){
				baos.write(flush, 0, len);
			}
			return baos.toByteArray();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return null;
	}
}












 

posted @ 2019-08-20 12:42  Steven-Russell  阅读(22)  评论(0编辑  收藏  举报  来源