使用java實現hex和ascii碼的轉換
幾乎很少寫JAVA程式碼,第一是確實不會,第二感覺JAVA寫起來不爽(較python、golang),但總有萬不得已必須要用java的時候。這裡記錄下使用java實現的hex十六進位制和acsii碼之間的轉換(程式碼主要還是從網上找來的,簡單改吧改吧)。
一、ASCII to Hex
這裡是將ascii碼轉換為十六進位制值,程式碼如下:
private static String asciiToHex(String asciiStr) {
char[] chars = asciiStr.toCharArray();
StringBuilder hex = new StringBuilder();
for (char ch : chars) {
hex.append(Integer.toHexString((int) ch));
}
return hex.toString();
}
中間使用十進位制進行了轉換一下。
二、hex to ascii
程式碼如下:
private static String hexToAscii(String hexStr) {
StringBuilder output = new StringBuilder("");
for (int i = 0; i < hexStr.length(); i += 2) {
String str = hexStr.substring(i, i + 2);
output.append((char) Integer.parseInt(str, 16));
}
return output.toString();
}
其流程是“Hex<==>Decimal<==>ASCII“。
三、完整示例
public class StringToHex{
public String convertStringToHex(String str){
char[] chars = str.toCharArray();
StringBuffer hex = new StringBuffer();
for(int i = 0; i < chars.length; i++){
hex.append(Integer.toHexString((int)chars[i]));
}
return hex.toString();
}
public String convertHexToString(String hex){
StringBuilder sb = new StringBuilder();
StringBuilder temp = new StringBuilder();
//49204c6f7665204a617661 split into two characters 49, 20, 4c...
for( int i=0; i //grab the hex in pairs String output = hex.substring(i, (i + 2)); //convert hex to decimal int decimal = Integer.parseInt(output, 16); //convert the decimal to character sb.append((char)decimal); temp.append(decimal); } System.out.println("Decimal : " + temp.toString()); return sb.toString(); } public static void main(String[] args) { StringToHex strToHex = new StringToHex(); System.out.println("\n***** Convert ASCII to Hex *****"); String str = "My site is www.361way.com,Fucking Java!"; System.out.println("Original input : " + str); String hex = strToHex.convertStringToHex(str); System.out.println("Hex : " + hex); System.out.println("\n***** Convert Hex to ASCII *****"); System.out.println("Hex : " + hex); System.out.println("ASCII : " + strToHex.convertHexToString(hex)); } } 上面的程式碼執行後,輸出如下: [root@localhost tmp]# java StringToHex ***** Convert ASCII to Hex ***** Original input : My site is www.361way.com,Fucking Java! Hex : 4d792073697465206973207777772e3336317761792e636f6d2c4675636b696e67204a61766121 ***** Convert Hex to ASCII ***** Hex : 4d792073697465206973207777772e3336317761792e636f6d2c4675636b696e67204a61766121 Decimal : 77121321151051161013210511532119119119465154491199712146991111094470117991071051101033274971189733 ASCII : My site is www.361way.com,Fucking Java!