Java官方操纵byte数组的方式

java官方提供了一种操作字节数组的方法——内存流（字节数组流）ByteArrayInputStream、ByteArrayOutputStream

ByteArrayOutputStream——byte数组合并

/*** 将所有的字节数组全部写入内存中，之后将其转化为字节数组*/public static void main(String[] args) throws IOException {String str1 = "132";String str2 = "asd";ByteArrayOutputStream os = new ByteArrayOutputStream();os.write(str1.getBytes());os.write(str2.getBytes());byte[] byteArray = os.toByteArray();System.out.println(new String(byteArray));}

 

ByteArrayInputStream——byte数组截取

/***   从内存中读取字节数组*/public static void main(String[] args) throws IOException {String str1 = "132asd";byte[] b = new byte[3];ByteArrayInputStream in = new ByteArrayInputStream(str1.getBytes());in.read(b);System.out.println(new String(b));in.read(b);System.out.println(new String(b));}