定义文件输入流，调用read(byte [] b) 方法，将001.txt的内容打印 byte大小为5

package com.heima.test;

import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;

import javax.imageio.stream.FileImageInputStream;

public class Test20 {

/**定义文件输入流，调用read(byte [] b) 方法，将001.txt的内容打印  byte大小为5
* @param args
* @throws IOException
*/
public static void main(String[] args) throws IOException {
FileInputStream fis = new FileInputStream("001.txt");
int len;
byte [] b = new byte[5];
ByteArrayOutputStream baos = new ByteArrayOutputStream();
while((len = fis.read(b)) != -1){
baos.write(b,0,len);
}
System.out.println(baos);
fis.close();
}

}