Handling with non-printable (control character) characters in a string

The browser cannot resolve JSON data that contains a printable string, and an error is available.

ASCII Character code Introduction: http://www.jb51.net/shouce/autoit3/source/html/appendix/ascii.htm

Processing method: To find the printable characters, and replace the printable characters can be.

The code is as follows:

	/** * @author Mr * @since 2017/1/5 * @param args/public static string Rebuildstrminusctl (string
		STR) {StringBuilder buff = new StringBuilder (); char[] arr = Str.tochararray ()//To be processed string character array char[] Ctl_arr = {(char) 0, (char) 1, (char) 2, (char) 3, (char) 4, (char) 5, (char) 6 , (char) 7, (char) 8, (char) 9, (char), (char) one, (char), (char), (char), (char), (char), (char), (char) 18, ( Char), (char), (char), (char), (char), (char), (char), (char), (char), (char), (char), (char) 30, ( Char), (char) 127,};
		Special character array list<character> ls = new arraylist<character> ();
			for (int i = 0; i < arr.length i++) {char tmp = arr[i];
				Excludes special characters for (int j = 0; J < Ctl_arr.length; J + +) {if (j+1==ctl_arr.length) {ls.add (TMP);
					}else if (Tmp==ctl_arr[j]) {ls.add (' ~ ');
				Break 
		The string for (int i = 0; i < ls.size (); i++) {Buff.append ((Character) ls.get (i));
	return buff.tostring (); }