StringEscapeUtils for character acceleration

where can I find this class StringEscapeUtils

that can automatically exit symbols instead of doing it manually ... in my search I found a utility named StringEscapeUtils

but I could not find in my project or I am trying to download from net but could not find too ... is there a way I can do that automate something like this:

String testStr = "< > \" &"; 
System.out.println("Escaped : " + StringEscapeUtils.escapeHtml(testStr));