Serve images from external directory via servlet

src/net/molez/mandlm/fotostream/client/CurrentImageNameService.java

@@ -3,8 +3,8 @@ package net.molez.mandlm.fotostream.client;
 import com.google.gwt.user.client.rpc.RemoteService;
 import com.google.gwt.user.client.rpc.RemoteServiceRelativePath;
 
-@RemoteServiceRelativePath("currentImageURL")
+@RemoteServiceRelativePath("currentImageName")
-public interface CurrentImageURLService extends RemoteService 
+public interface CurrentImageNameService extends RemoteService 
 {
-	String getCurrentImageURL();
+	String getCurrentImageName();
 }

src/net/molez/mandlm/fotostream/client/CurrentImageNameServiceAsync.java

@@ -0,0 +1,8 @@
+package net.molez.mandlm.fotostream.client;
+
+import com.google.gwt.user.client.rpc.AsyncCallback;
+
+public interface CurrentImageNameServiceAsync 
+{
+	void getCurrentImageName(AsyncCallback<String> callback);
+}

src/net/molez/mandlm/fotostream/client/CurrentImageURLServiceAsync.java

@@ -1,8 +0,0 @@
-package net.molez.mandlm.fotostream.client;
-
-import com.google.gwt.user.client.rpc.AsyncCallback;
-
-public interface CurrentImageURLServiceAsync 
-{
-	void getCurrentImageURL(AsyncCallback<String> callback);
-}

src/net/molez/mandlm/fotostream/client/FotoStream.java

@@ -12,7 +12,7 @@ import com.google.gwt.user.client.ui.RootPanel;
 
 public class FotoStream implements EntryPoint 
 {
-	private final CurrentImageURLServiceAsync imageURLService = GWT.create(CurrentImageURLService.class);
+	private final CurrentImageNameServiceAsync imageNameService = GWT.create(CurrentImageNameService.class);
 
 	public void onModuleLoad() 
 	{
@@ -49,7 +49,7 @@ public class FotoStream implements EntryPoint
 			@Override
 			public void run() 
 			{
-				imageURLService.getCurrentImageURL(new AsyncCallback<String>()
+				imageNameService.getCurrentImageName(new AsyncCallback<String>()
 				{
 					@Override
 					public void onFailure(Throwable caught) 
@@ -60,10 +60,7 @@ public class FotoStream implements EntryPoint
 					@Override
 					public void onSuccess(String result) 
 					{
-						if (result != image.getUrl())
+						image.setUrl("image?name=" + result);
-						{
-							image.setUrl(result);
-						}
 					}			
 				});
 			}	

src/net/molez/mandlm/fotostream/server/CurrentImageNameServiceImpl.java

@@ -9,10 +9,10 @@ import java.util.Random;
 
 import com.google.gwt.user.server.rpc.RemoteServiceServlet;
 
-import net.molez.mandlm.fotostream.client.CurrentImageURLService;
+import net.molez.mandlm.fotostream.client.CurrentImageNameService;
 
 @SuppressWarnings("serial")
-public class CurrentImageURLServiceImpl extends RemoteServiceServlet implements CurrentImageURLService 
+public class CurrentImageNameServiceImpl extends RemoteServiceServlet implements CurrentImageNameService 
 {
 	private List<File> imageFiles = new ArrayList<File>();
 	
@@ -44,7 +44,7 @@ public class CurrentImageURLServiceImpl extends RemoteServiceServlet implements
 		});		
 	}
 	
-	public String getCurrentImageURL() 
+	public String getCurrentImageName() 
 	{
 		int newImageSeconds = 60;
 		
@@ -60,11 +60,11 @@ public class CurrentImageURLServiceImpl extends RemoteServiceServlet implements
 		
 		if (latestFileDate.before(new Date(new Date().getTime() - newImageSeconds * 1000)))
 		{
-			return imageFiles.get(new Random().nextInt(imageFiles.size())).getPath();
+			return imageFiles.get(new Random().nextInt(imageFiles.size())).getName();
 		}
 		else
 		{
-			return latestFile.getPath();
+			return latestFile.getName();
 		}
 	}
 }

src/net/molez/mandlm/fotostream/server/ImageServlet.java

@@ -0,0 +1,28 @@
+package net.molez.mandlm.fotostream.server;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.OutputStream;
+
+import javax.imageio.ImageIO;
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+@SuppressWarnings("serial")
+public class ImageServlet extends HttpServlet 
+{
+	@Override
+	public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
+	{
+		String imageName = request.getParameter("name");
+		File f = new File("img/" + imageName);
+		
+		response.setContentType("image/jpeg");
+		OutputStream out = response.getOutputStream();
+		
+		ImageIO.write(ImageIO.read(f), "jpg", out);
+		out.close();
+	}
+}

war/WEB-INF/web.xml

@@ -8,13 +8,23 @@
   <!-- Servlets -->
   
   <servlet>
-  	<servlet-name>currentImageURLServlet</servlet-name>
+  	<servlet-name>currentImageNameServlet</servlet-name>
-  	<servlet-class>net.molez.mandlm.fotostream.server.CurrentImageURLServiceImpl</servlet-class>
+  	<servlet-class>net.molez.mandlm.fotostream.server.CurrentImageNameServiceImpl</servlet-class>
   </servlet>
   
   <servlet-mapping>
-  	<servlet-name>currentImageURLServlet</servlet-name>
+  	<servlet-name>currentImageNameServlet</servlet-name>
-  	<url-pattern>/fotostream/currentImageURL</url-pattern>
+  	<url-pattern>/fotostream/currentImageName</url-pattern>
+  </servlet-mapping>
+  
+  <servlet>
+    <servlet-name>ImageServlet</servlet-name>
+    <servlet-class>net.molez.mandlm.fotostream.server.ImageServlet</servlet-class>
+  </servlet>
+
+  <servlet-mapping>
+  	<servlet-name>ImageServlet</servlet-name>
+  	<url-pattern>/image</url-pattern>
   </servlet-mapping>
 
   <!-- Default page to serve -->