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    <p>First of all you need a <a href="http://commons.apache.org/proper/commons-fileupload/" rel="nofollow">servlet in Tomcat</a></p> <p>Then send the image to the servlet using <a href="https://code.google.com/p/gwt-html5-wrappers/source/browse/trunk/src/com/pixeljet/html5/client/FormData.java?r=2" rel="nofollow">FormData</a> and <a href="https://code.google.com/p/gwt-xmlhttprequest2/source/browse/src/com/google/gwt/xhr/client/XMLHTTPRequest2.java?r=1ca8108b439f38a945223eeffd1343e9f48d5e44" rel="nofollow">XMLHTTPRequest2</a></p> <p>You need to getthe image from the DOM, and then do something like that:</p> <pre><code>String url = GWT.getHostPageBaseURL() + "UploadFileServlet?sid=" + AppHelper.remoteService.getSessionID(); XMLHTTPRequest2 xhr = (XMLHTTPRequest2) XMLHTTPRequest2.create(); xhr.open("POST", url); FormData formData = FormData.create(); formData.append("file", imagedata); xhr.setOnReadyStateChange(new ReadyStateChangeHandler() { //@Override public void onReadyStateChange(XMLHttpRequest xhr) { /////Window.alert(" " + xhr.getStatus()); // When the form submission is successfully completed, this event is // fired. Assuming the service returned a response of type text/html, // we can get the result text here (see the FormPanel documentation for // further explanation). //Window.alert(event.getResults()); String result = xhr.getResponseText(); if(result.equals("ok")) { Window.alert("File uploaded"); } else { Window.alert(result); } } }); xhr.send(formData); </code></pre> <p><strong>This is the FormData class</strong></p> <pre><code>public class FormData extends JavaScriptObject { //default constructor //see more at http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#formdata protected FormData() { } /** * add a pair of value to form. * &lt;p&gt; * See &lt;a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#formdata" * &gt;http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#formdata&lt;/a&gt;. * * @param name the name to be add * @param value the value to be add */ public final native void append(String name, String value) /*-{ this.append(name, value); }-*/; public final native void append(String name, JavaScriptObject value) /*-{ this.append(name, value); }-*/; /** * Creates an XMLHttpRequest object. * * @return the created object */ public static native FormData create() /*-{ return new FormData(); }-*/; } </code></pre> <p><strong>And this is XMLHttpRequest2 class</strong></p> <pre><code>public class XMLHTTPRequest2 extends XMLHttpRequest { /** * Constructor */ protected XMLHTTPRequest2() { } /** * Initiates a request with data. If there is no data, specify null. * &lt;p&gt; * See &lt;a href="http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#dom-xmlhttprequest-send" * &gt;http://dev.w3.org/2006/webapi/XMLHttpRequest-2/#dom-xmlhttprequest-send&lt;/a&gt;. * * @param requestData the data to be sent with the request */ public final native &lt;T&gt; void send(T requestData) /*-{ this.send(requestData); }-*/; } </code></pre>
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    1. POhow to upload image directly from client side to server
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    1. COIs formdata and XMLHTTPRequest2 supported as i am not able to use them ?
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    2. COThese are GWT wrappers for Javascript, I've posted some links for GWT wrappers. To make the wrappers yoursel you need to JSNI, these classes are not part of the GWT
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    3. COWith JSNI you can use in GWT native javascript
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