JAVA 十六进制与字符串的转换

/**
 * 字符串转换unicode
 */
public static String string2Unicode(String string) {
　　StringBuffer unicode = new StringBuffer();
　　for (int i = 0; i < string.length(); i++) {
　　　　// 取出每一个字符
 char c = string.charAt(i);
 // 转换为unicode
 unicode.append("\\u" + Integer.toHexString(c));
　　}
　　return unicode.toString();
}

/**
 * 字符串转化成为16进制字符串
 * @param s
 * @return
 */
public static String strTo16(String s) {
 String str = "";
 for (int i = 0; i < s.length(); i++) {
  int ch = (int) s.charAt(i);
  String s4 = Integer.toHexString(ch);
  str = str + s4;
 }
 return str;
}

/**
 * 16进制转换成为string类型字符串
 * @param s
 * @return
 */
public static String hexStringToString(String s) {
 if (s == null || s.equals("")) {
  return null;
 }
 s = s.replace(" ", "");
 byte[] baKeyword = new byte[s.length() / 2];
 for (int i = 0; i < baKeyword.length; i++) {
  try {
   baKeyword[i] = (byte) (0xff & Integer.parseInt(s.substring(i * 2, i * 2 + 2), 16));
  } catch (Exception e) {
   e.printStackTrace();
  }
 }
 try {
  s = new String(baKeyword, "UTF-8");
  new String();
 } catch (Exception e1) {
  e1.printStackTrace();
 }
 return s;
}

/**
 * unicode 转字符串
 */
public static String unicode2String(String unicode) {
 StringBuffer string = new StringBuffer();
 String[] hex = unicode.split("\\\\u");
 for (int i = 1; i < hex.length; i++) {
  // 转换出每一个代码点
  int data = Integer.parseInt(hex[i], 16);
  // 追加成string
  string.append((char) data);
 }
 return string.toString();
}

/**
 * 字符串转换成为16进制(无需Unicode编码)
 * @param str
 * @return
 */
public static String str2HexStr(String str) {
 char[] chars = "0123456789ABCDEF".toCharArray();
 StringBuilder sb = new StringBuilder("");
 byte[] bs = str.getBytes();
 int bit;
 for (int i = 0; i < bs.length; i++) {
  bit = (bs[i] & 0x0f0) >> 4;
  sb.append(chars[bit]);
  bit = bs[i] & 0x0f;
  sb.append(chars[bit]);
  // sb.append(' ');
 }
 return sb.toString().trim();
}

/**
 * 16进制直接转换成为字符串(无需Unicode解码)
 * @param hexStr
 * @return
 */
public static String hexStr2Str(String hexStr) {
 String str = "0123456789ABCDEF";
 char[] hexs = hexStr.toCharArray();
 byte[] bytes = new byte[hexStr.length() / 2];
 int n;
 for (int i = 0; i < bytes.length; i++) {
  n = str.indexOf(hexs[2 * i]) * 16;
  n += str.indexOf(hexs[2 * i + 1]);
  bytes[i] = (byte) (n & 0xff);
 }
 return new String(bytes);
}

public class HexStringUtils {

 private static final char[] DIGITS_HEX = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D',
   'E', 'F' };

 protected static char[] encodeHex(byte[] data) {
  int l = data.length;
  char[] out = new char[l << 1];
  for (int i = 0, j = 0; i < l; i++) {
   out[j++] = DIGITS_HEX[(0xF0 & data[i]) >>> 4];
   out[j++] = DIGITS_HEX[0x0F & data[i]];
  }
  return out;
 }

 protected static byte[] decodeHex(char[] data) {
  int len = data.length;
  if ((len & 0x01) != 0) {
   throw new RuntimeException("字符个数应该为偶数");
  }
  byte[] out = new byte[len >> 1];
  for (int i = 0, j = 0; j < len; i++) {
   int f = toDigit(data[j], j) << 4;
   j++;
   f |= toDigit(data[j], j);
   j++;
   out[i] = (byte) (f & 0xFF);
  }
  return out;
 }

 protected static int toDigit(char ch, int index) {
  int digit = Character.digit(ch, 16);
  if (digit == -1) {
   throw new RuntimeException("Illegal hexadecimal character " + ch + " at index " + index);
  }
  return digit;
 }

 public static String toHex(String str) {
  return new String(encodeHex(str.getBytes()));
 }

 public static String fromHex(String hex) {
  return new String(decodeHex(hex.toCharArray()));
 }

 public static void main(String[] args) {
  String s = "abc你好";
  String hex = toHex(s);
  String decode = fromHex(hex);
  System.out.println("原字符串:" + s);
  System.out.println("十六进制字符串:" + hex);
  System.out.println("还原:" + decode);
 }
}

// 转化字符串为十六进制编码 
public static String toHexString(String s) 
{ 
String str=""; 
for (int i=0;i<s.length();i++) 
{ 
int ch = (int)s.charAt(i); 
String s4 = Integer.toHexString(ch); 
str = str + s4; 
} 
return str; 
} 
// 转化十六进制编码为字符串 
public static String toStringHex(String s) 
{ 
byte[] baKeyword = new byte[s.length()/2]; 
for(int i = 0; i < baKeyword.length; i++) 
{ 
try 
{ 
baKeyword[i] = (byte)(0xff & Integer.parseInt(s.substring(i*2, i*2+2),16)); 
} 
catch(Exception e) 
{ 
e.printStackTrace(); 
} 
} 
try 
{ 
s = new String(baKeyword, "utf-8");//UTF-16le:Not 
} 
catch (Exception e1) 
{ 
e1.printStackTrace(); 
} 
return s; 
} 
// 转化十六进制编码为字符串 
public static String toStringHex(String s) 
{ 
byte[] baKeyword = new byte[s.length()/2]; 
for(int i = 0; i < baKeyword.length; i++) 
{ 
try 
{ 
baKeyword[i] = (byte)(0xff & Integer.parseInt(s.substring(i*2, i*2+2),16)); 
} 
catch(Exception e) 
{ 
e.printStackTrace(); 
} 
} 
try 
{ 
s = new String(baKeyword, "utf-8");//UTF-16le:Not 
} 
catch (Exception e1) 
{ 
e1.printStackTrace(); 
} 
return s; 
} 
public static void main(String[] args) { 
System.out.println(encode("中文")); 
System.out.println(decode(encode("中文"))); 
} 
/* 
* 16进制数字字符集 
*/ 
private static String hexString="0123456789ABCDEF"; 
/* 
* 将字符串编码成16进制数字,适用于所有字符（包括中文） 
*/ 
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(); 
} 
/* 
* 将16进制数字解码成字符串,适用于所有字符（包括中文） 
*/ 
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()); 
} 

package com.nantian.iclient.atm.sdb; 

public class Util { 
public Util() { 
} 

/** 
* 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; 
} 

}