Hexadecimal (hex) ASCII code strings and the String Huzhuan

1. / * 0-9 correspond Ascii 48-57

2. *A-Z 65-90

3. *a-z 97-122

4. * Number of 33 to 126 (total of 94) are characters, the first of which is 48 to 57 ten digits 0 ~ 9

*/

	/**
	 * ASCII码hex字符串转String明文
	 * 每两个字符表示的16进制ASCII码解析成一个明文字符
	 * @param hex
	 * @return
	 */
	public static String hex2Str(String hex) {
	    StringBuilder sb = new StringBuilder();
	    for (int i = 0; i < hex.length() - 1; i += 2) {
	        String h = hex.substring(i, (i + 2));
	        int decimal = Integer.parseInt(h, 16);
	        sb.append((char) decimal);
	    }
	    return sb.toString();
	}

	/**
	 * String明文转ASCII码hex字符串
	 * 一个明文字符生成两个字符表示的16进制ASCII码
	 * @param str
	 * @return
	 */
	public static String str2Hex(String str) {
	    StringBuilder sb = new StringBuilder();
	    for (int i = 0; i < str.length(); i++) {
	        char c = str.charAt(i);
	        // 这里的第二个参数16表示十六进制
	        sb.append(Integer.toString(c, 16));	        
	    }
	    return sb.toString();
	}

System.out.println(hex2Str("3132302E37382E3134342E3137343A38353939"));
		System.out.println(str2Hex("120.78.144.174:8599"));

test: