如何将字节转换为其二进制字符串表示形式
例如，一个字节B中的位是10000010，我怎样才能将这些位从字面上分配给字符串str，即, str = "10000010".
For example, the bits in a byte B are 10000010, how can I assign the bits to the string str literally, that is, str = "10000010".
编辑
我从二进制文件中读取字节，并存储在字节数组B中.我使用 System.out.println(Integer.toBinaryString(B[i])).问题是
I read the byte from a binary file, and stored in the byte array B. I use System.out.println(Integer.toBinaryString(B[i])). the problem is
(a) 当位以(最左边的)1 开始时，输出不正确，因为它将 B[i] 转换为负 int 值.
(a) when the bits begin with (leftmost) 1, the output is not correct because it converts B[i] to a negative int value.
(b) 如果位以0开头，则输出忽略0，例如假设B[0]有00000001，输出是 1 而不是 00000001
(b) if the bits begin with 0, the output ignore 0, for example, assume B[0] has 00000001, the output is 1 instead of 00000001
推荐答案
使用整数#toBinaryString():
byte b1 = (byte) 129;
String s1 = String.format("%8s", Integer.toBinaryString(b1 & 0xFF)).replace(' ', '0');
System.out.println(s1); // 10000001
byte b2 = (byte) 2;
String s2 = String.format("%8s", Integer.toBinaryString(b2 & 0xFF)).replace(' ', '0');
System.out.println(s2); // 00000010
演示.
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