CODEWITHSUNDEEP
javajavascriptescaping
Fernando Magalhães
Fernando Magalhães

Reputation: 571

Java equivalent to JavaScript unescape function

Is there any function in Java programming language that is equivalent to JavaScript unescape function? That is, if my input is the string "I%20need%20help%21" the output must be "I need help!", for example.

Thanks!

Upvotes: 4

Views: 11877

Answers (4)

machinery
machinery

Reputation: 3945

From my experience URLDecoder.decode might fail if there are non-ASCII characters in the encoded string. For example this code:

URLDecoder.decode("%u017C", "UTF-8"); // %u017C is the result of running in Javascript escape('ż')

throws the following exception:

Exception in thread "main" java.lang.IllegalArgumentException: URLDecoder: Illegal hex characters in escape (%) pattern - For input string: "u0"

The best way of solving this issue that I know of (though clumsy) is just running Javascript in Java :(

String jsEscapedString = "%u017C";
ScriptEngineManager factory = new ScriptEngineManager();
ScriptEngine engine = factory.getEngineByName("JavaScript");
String result = (String) engine.eval("unescape('" + jsEscapedString + "')");

BTW solution inspired by Siva R Vaka's post

Upvotes: 10

feder
feder

Reputation: 1795

That is fine @Nrj, but developers are to invoke it staticly.

URLDecoder.decode("I%20need%20help%21","UTF-8");

Upvotes: 0

Mark Byers
Mark Byers

Reputation: 838896

You could use URLDecoder. Assuming you are using UTF-8:

String result = URLDecoder.decode(s, "UTF-8");

Upvotes: 4

Nrj
Nrj

Reputation: 6841

Try this 

URLDecoder dec = new URLDecoder();
        String val = dec.decode("I%20need%20help%21","UTF-8");
        System.out.println(val);

Upvotes: 1

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