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Alex Worden
Alex Worden

Reputation: 3415

How should a GWT encoded query parameter be decoded server side?

I'm encoding a query parameter using GWT's com.google.gwt.http.client.URL.encode() method, but have found I can't use URL.decode() on the server to decode it because the implementation isn't available (I suspect it uses the javascript client side implementation). I get...

java.lang.UnsatisfiedLinkError: com.google.gwt.http.client.URL.decodeImpl(Ljava/lang/String;)Ljava/lang/String;

Can someone suggest what I'm supposed to use server side to decode the encoded string?

Upvotes: 7

Views: 11088

Answers (3)

Ena
Ena

Reputation: 3621

I solved my problem this way: on the client side, I encode the parameters using com.google.gwt.http.client.URL.encodeQueryString(), like:

URL.encodeQueryString(param)

On the server side, I get the parameters using the ServletRequest methods, like:

String myParam = req.getParameter("myparam");

PS I initially +1'd Riley Lark's answer, but then I got some problems with some characters too... Letting the ServletRequest do the job will handle all character's encoding for you. See Decoding international chars in AppEngine

Upvotes: 9

Riley Lark
Riley Lark

Reputation: 20890

java.net.URLDecoder is implemented on AppEngine and works perfectly with com.google.gwt.http.client.URL.encode().

Upvotes: 3

Lucas de Oliveira
Lucas de Oliveira

Reputation: 1632

If you're not willing to use gwt-rpc you can encode/decode with Base64. Check this link for a gwt implementation of the Base64 encoder/decoder. Then all you have to do is Base64.encode(yourParameterValue) before sending the request to the server and Base64.decode(request.getParameter(yourParameterName)) on the backend right after receiving the request.

cheers!

Upvotes: -1

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