Java的16进制与字符串的相互转换函数-优快云博客

/**
* 将指定byte数组以16进制的形式打印到控制台
* @param hint String
* @param b byte[]
* @return void
*/
public static void printHexString(String hint, byte[] b) {
System.out.print(hint);
for (int i = 0; i < b.length; i++) {
String hex = Integer.toHexString(b[i] & 0xFF);
if (hex.length() == 1) {
hex = '0' + hex;
}
System.out.print(hex.toUpperCase() + " ");
}
System.out.println("");
}
/**
*
* @param b byte[]
* @return String
*/
public static String Bytes2HexString(byte[] b) {
String ret = "";
for (int i = 0; i < b.length; i++) {
String hex = Integer.toHexString(b[i] & 0xFF);
if (hex.length() == 1) {
hex = '0' + hex;
}
ret += hex.toUpperCase();
}
return ret;
}
/**
* 将两个ASCII字符合成一个字节；
* 如："EF"--> 0xEF
* @param src0 byte
* @param src1 byte
* @return byte
*/
public static byte uniteBytes(byte src0, byte src1) {
byte _b0 = Byte.decode("0x" + new String(new byte[]{src0})).byteValue();
_b0 = (byte)(_b0 << 4);
byte _b1 = Byte.decode("0x" + new String(new byte[]{src1})).byteValue();
byte ret = (byte)(_b0 ^ _b1);
return ret;
}
/**
* 将指定字符串src，以每两个字符分割转换为16进制形式
* 如："2B44EFD9" --> byte[]{0x2B, 0x44, 0xEF, 0xD9}
* @param src String
* @return byte[]
*/
public static byte[] HexString2Bytes(String src){
byte[] ret = new byte[8];
byte[] tmp = src.getBytes();
for(int i=0; i<8; i++){
ret[i] = uniteBytes(tmp[i*2], tmp[i*2+1]);
}
return ret;

}

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public static String stringToHexString(String strPart) {
 String hexString = ""; for (int i = 0; i < strPart.length(); i++) { int ch = (int) strPart.charAt(i); String strHex = Integer.toHexString(ch); hexString = hexString + strHex; } return hexString; } private static String hexString="0123456789ABCDEF"; public static String encode(String str) { // 根据默认编码获取字节数组 byte[] bytes=str.getBytes(); StringBuilder sb=new StringBuilder(bytes.length*2); // 将字节数组中每个字节拆解成2位16进制整数 for(int i=0;i<bytes.length;i++) { sb.append(hexString.charAt((bytes[i]&0xf0)>>4)); sb.append(hexString.charAt((bytes[i]&0x0f)>>0)); } return sb.toString(); }

public static String decode(String bytes)
{
ByteArrayOutputStream baos=new ByteArrayOutputStream(bytes.length()/2);
// 将每2位16进制整数组装成一个字节
for(int i=0;i<bytes.length();i+=2)
baos.write((hexString.indexOf(bytes.charAt(i))<<4 |hexString.indexOf(bytes.charAt(i+1))));
return new String(baos.toByteArray());
}

private static byte uniteBytes(byte src0, byte src1) {
 byte _b0 = Byte.decode("0x" + new String(new byte[] {src0})).byteValue(); _b0 = (byte) (_b0 << 4); byte _b1 = Byte.decode("0x" + new String(new byte[] {src1})).byteValue(); byte ret = (byte) (_b0 | _b1); return ret; public static byte[] HexString2Bytes(String src) { byte[] ret = new byte[6]; byte[] tmp = src.getBytes(); for(int i=0; i<6; ++i ) { ret[i] = uniteBytes(tmp[i*2], tmp[i*2+1]); } return ret; }

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java 格式化输出十六进制数

// 以16进制输出文件内容, 每16个数换行一次 for(int i = 0; i < nLen; i++) { if(i % 16 == 0) System.out.println(); String strHex = new String(); strHex = Integer.toHexString(chBuf[i]).toUpperCase(); if(strHex.length() > 3) System.out.print(strHex.substring(6)); else if(strHex.length() < 2) System.out.print("0" + strHex); else System.out.print(strHex); System.out.print(" "); }

输出结果

-----------------------------------------------------------------------

FF D8 FF E0 00 10 4A 46 49 46 00 01 01 00 00 01
00 01 00 00 FF E1 00 E6 45 78 69 66 00 00 49 49
2A 00 08 00 00 00 05 00 12 01 03 00 01 00 00 00
01 00 00 00 31 01 02 00 1C 00 00 00 4A 00 00 00
32 01 02 00 14 00 00 00 66 00 00 00 13 02 03 00
01 00 00 00 01 00 00 00 69 87 04 00 01 00 00 00
7A 00 00 00

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当我们把string字符串转成byte[]后，要再转成string 通过String.valueof()是实现不了的，只能new string(byte [])。

呵呵,我在使用java3des数据加密的时候,byte转string,存到文件,再取出string再转byte还是不对的,所以newstring(byte[])也不见得会得到正确结果的!!最后我是采用byte转成16进制字符串,然后再将16进制字符串转换成byte才可以的.