JAVA hexadecimal and string conversion

toHexString
public static String toHexString(int i) returns the string representation of an integer parameter in the form of a hexadecimal unsigned integer.
If the parameter is negative, the unsigned integer value is the parameter plus 232; otherwise it is equal to the parameter. Converts the value to a hexadecimal (base 16) ASCII numeric string without leading 0s. If the size value of an unsigned number is zero, it is represented by a zero character '0' ('\u0030'); otherwise, the first character in the representation of the size of an unsigned number will not be a zero character. Use the following characters as hexadecimal numbers:
0123456789abcdef
The range of these characters is from '\u0030' to '\u0039' and from '\u0061' to '\u0066'. If you want uppercase letters, you can call the String.toUpperCase() method on the result:
Integer.toHexString(n).toUpperCase()
Parameters:
i - the integer to be converted to a string.
Returns:
The string representation of the unsigned integer value represented by the hexadecimal (base 16) argument.
// Convert string to hexadecimal encoding
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;
}
//Convert hexadecimal encoding to string
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;
}
// Convert hexadecimal encoding to string
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("Chinese"));
System.out.println(decode(encode( "Chinese")));
}
/*
* Hexadecimal numeric character set
*/
private static String hexString="0123456789ABCDEF";
/*
* Encode the string into hexadecimal numbers, applicable to all characters (including Chinese)
*/
public static String encode(String str)
{
//Get the word according to the default encoding Section array
byte[] bytes=str.getBytes();
StringBuilder sb=new StringBuilder(bytes.length*2);
//Decompose each byte in the byte array into 2 digit hexadecimal integer
for(int i=0;i{
sb.append(hexString.charAt((bytes[i]&0xf0)>>4 ));
sb.append(hexString.charAt((bytes[i]&0x0f)>>0));
}
return sb.toString();
}
/*
* Decode hexadecimal numbers into strings, applicable to all characters (including Chinese)
*/
public static String decode(String bytes)
{
ByteArrayOutputStream baos= new ByteArrayOutputStream(bytes.length()/2);
//Assemble each 2-digit hexadecimal integer into one byte
for(int i=0;ibaos.write((hexString.indexOf(bytes.charAt(i))<<4 |hexString.indexOf(bytes.charAt(i+1))));
return new String( baos.toByteArray());
}
Second method:
Print the specified byte array to the console in hexadecimal form

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 = &#39;0&#39; + 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 = &#39;0&#39; + 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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