(学习笔记) Java byte[]转二进制字符串,十六进制字符串的相互转换

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public class HexConver
{
public static void main(String[] args)
{
String content = "这是一个测试";
System.out.println("原字符串："+content);
String hex2Str = conver2HexStr(content.getBytes());
System.out.println("n转换为二进制的表示形式："+hex2Str);
byte [] b = conver2HexToByte(hex2Str);
System.out.println("二进制字符串还原："+new String(b));
String hex16Str = conver16HexStr(content.getBytes());
System.out.println("n转换为十六进制的表示形式:"+ hex16Str);
System.out.println("十六进制字符串还原:"+ new String(conver16HexToByte(hex16Str)));
}
/**
* byte数组转换为二进制字符串,每个字节以","隔开
* **/
public static String conver2HexStr(byte [] b)
{
StringBuffer result = new StringBuffer();
for(int i = 0;i<b.length;i++)
{
result.append(Long.toString(b[i] & 0xff, 2)+",");
}
return result.toString().substring(0, result.length()-1);
}
/**
* 二进制字符串转换为byte数组,每个字节以","隔开
* **/
public static byte[] conver2HexToByte(String hex2Str)
{
String [] temp = hex2Str.split(",");
byte [] b = new byte[temp.length];
for(int i = 0;i<b.length;i++)
{
b[i] = Long.valueOf(temp[i], 2).byteValue();
}
return b;
}
/**
* byte数组转换为十六进制的字符串
* **/
public static String conver16HexStr(byte [] b)
{
StringBuffer result = new StringBuffer();
for(int i = 0;i<b.length;i++)
{
if((b[i]&0xff)<0x10)
result.append("0");
result.append(Long.toString(b[i]&0xff, 16));
}
return result.toString().toUpperCase();
}
/**
* 十六进制的字符串转换为byte数组
* **/
public static byte[] conver16HexToByte(String hex16Str)
{
char [] c = hex16Str.toCharArray();
byte [] b = new byte[c.length/2];
for(int i = 0;i<b.length;i++)
{
int pos = i * 2;
b[i] = (byte)("0123456789ABCDEF".indexOf(c[pos]) << 4 | "0123456789ABCDEF".indexOf(c[pos+1]));
}
return b;
}
}