added demo code

.gitignore

@@ -0,0 +1,17 @@
+.settings
+.metadata
+.backup
+*.war
+.DS_Store
+.DS_Store?
+ehthumbs.db
+Thumbs.db
+.Spotlight-V100
+.Trashes
+/target/*
+classes/
+._*
+Servers
+.idea
+.project
+.classpath

src/META-INF/jdoconfig.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<jdoconfig xmlns="http://java.sun.com/xml/ns/jdo/jdoconfig"
+   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+   xsi:noNamespaceSchemaLocation="http://java.sun.com/xml/ns/jdo/jdoconfig">
+
+   <persistence-manager-factory name="transactions-optional">
+       <property name="javax.jdo.PersistenceManagerFactoryClass"
+           value="org.datanucleus.api.jdo.JDOPersistenceManagerFactory"/>
+       <property name="javax.jdo.option.ConnectionURL" value="appengine"/>
+       <property name="javax.jdo.option.NontransactionalRead" value="true"/>
+       <property name="javax.jdo.option.NontransactionalWrite" value="true"/>
+       <property name="javax.jdo.option.RetainValues" value="true"/>
+       <property name="datanucleus.appengine.autoCreateDatastoreTxns" value="true"/>
+       <property name="datanucleus.appengine.singletonPMFForName" value="true"/>
+   </persistence-manager-factory>
+</jdoconfig>

src/META-INF/persistence.xml

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+<?xml version="1.0" encoding="UTF-8" ?>
+<persistence xmlns="http://java.sun.com/xml/ns/persistence"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://java.sun.com/xml/ns/persistence
+        http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd" version="1.0">
+
+    <persistence-unit name="transactions-optional">
+        <provider>org.datanucleus.api.jpa.PersistenceProviderImpl</provider>
+        <properties>
+            <property name="datanucleus.NontransactionalRead" value="true"/>
+            <property name="datanucleus.NontransactionalWrite" value="true"/>
+            <property name="datanucleus.ConnectionURL" value="appengine"/>
+        </properties>
+    </persistence-unit>
+</persistence>

src/com/df/angularfileupload/FileUpload.java

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+package com.df.angularfileupload;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.PrintWriter;
+
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.apache.commons.fileupload.FileItemIterator;
+import org.apache.commons.fileupload.FileItemStream;
+import org.apache.commons.fileupload.servlet.ServletFileUpload;
+
+public class FileUpload extends HttpServlet {
+	private static final long serialVersionUID = -8244073279641189889L;
+
+	@Override
+	public void doPost(HttpServletRequest req, HttpServletResponse res)
+			throws ServletException, IOException {
+		try {
+			ServletFileUpload upload = new ServletFileUpload();
+
+			FileItemIterator iterator = upload.getItemIterator(req);
+
+			StringBuilder sb = new StringBuilder();
+
+			while (iterator.hasNext()) {
+				FileItemStream item = iterator.next();
+				sb.append(item.getFieldName());
+				if (item.getName() != null) {
+					sb.append(" - ").append(item.getName());
+
+				}
+				sb.append(" : ");
+				if (item.getName() != null) {
+					sb.append("file size on the server: ").append(
+							fileSize(item.openStream()));
+				} else {
+					sb.append(read(item.openStream()));
+				}
+				sb.append("<br/>");
+			}
+			res.setContentType("text/plain");
+			PrintWriter printWriter = new PrintWriter(res.getOutputStream());
+			try {
+				printWriter.print(sb.toString());
+				printWriter.flush();
+			} finally {
+				printWriter.close();
+			}
+		} catch (Exception ex) {
+			throw new ServletException(ex);
+		}
+	}
+
+	protected int fileSize(InputStream stream) {
+		int length = 0;
+		try {
+			byte[] buffer = new byte[2048];
+			int size;
+			while ((size = stream.read(buffer)) != -1) {
+				length += size;
+			}
+		} catch (IOException e) {
+			throw new RuntimeException(e);
+		}
+		return length;
+
+	}
+
+	protected String read(InputStream stream) {
+		StringBuilder sb = new StringBuilder();
+		BufferedReader reader = new BufferedReader(
+				new InputStreamReader(stream));
+		try {
+			String line;
+			while ((line = reader.readLine()) != null) {
+				sb.append(line);
+			}
+		} catch (IOException e) {
+			throw new RuntimeException(e);
+		} finally {
+			try {
+				reader.close();
+			} catch (IOException e) {
+			}
+		}
+		return sb.toString();
+
+	}
+}

src/log4j.properties

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+# A default log4j configuration for log4j users.
+#
+# To use this configuration, deploy it into your application's WEB-INF/classes
+# directory.  You are also encouraged to edit it as you like.
+
+# Configure the console as our one appender
+log4j.appender.A1=org.apache.log4j.ConsoleAppender
+log4j.appender.A1.layout=org.apache.log4j.PatternLayout
+log4j.appender.A1.layout.ConversionPattern=%d{HH:mm:ss,SSS} %-5p [%c] - %m%n
+
+# tighten logging on the DataNucleus Categories
+log4j.category.DataNucleus.JDO=WARN, A1
+log4j.category.DataNucleus.Persistence=WARN, A1
+log4j.category.DataNucleus.Cache=WARN, A1
+log4j.category.DataNucleus.MetaData=WARN, A1
+log4j.category.DataNucleus.General=WARN, A1
+log4j.category.DataNucleus.Utility=WARN, A1
+log4j.category.DataNucleus.Transaction=WARN, A1
+log4j.category.DataNucleus.Datastore=WARN, A1
+log4j.category.DataNucleus.ClassLoading=WARN, A1
+log4j.category.DataNucleus.Plugin=WARN, A1
+log4j.category.DataNucleus.ValueGeneration=WARN, A1
+log4j.category.DataNucleus.Enhancer=WARN, A1
+log4j.category.DataNucleus.SchemaTool=WARN, A1

war/WEB-INF/appengine-web.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<appengine-web-app xmlns="http://appengine.google.com/ns/1.0">
+  <application>angular-file-upload</application>
+  <version>1</version>
+
+  <!--
+    Allows App Engine to send multiple requests to one instance in parallel:
+  -->
+  <threadsafe>true</threadsafe>
+
+  <!-- Configure java.util.logging -->
+  <system-properties>
+    <property name="java.util.logging.config.file" value="WEB-INF/logging.properties"/>
+  </system-properties>
+
+  <!--
+    HTTP Sessions are disabled by default. To enable HTTP sessions specify:
+
+      <sessions-enabled>true</sessions-enabled>
+
+    It's possible to reduce request latency by configuring your application to
+    asynchronously write HTTP session data to the datastore:
+
+      <async-session-persistence enabled="true" />
+
+    With this feature enabled, there is a very small chance your app will see
+    stale session data. For details, see
+    http://code.google.com/appengine/docs/java/config/appconfig.html#Enabling_Sessions
+  -->
+
+</appengine-web-app>

war/WEB-INF/logging.properties

@@ -0,0 +1,13 @@
+# A default java.util.logging configuration.
+# (All App Engine logging is through java.util.logging by default).
+#
+# To use this configuration, copy it into your application's WEB-INF
+# folder and add the following to your appengine-web.xml:
+# 
+# <system-properties>
+#   <property name="java.util.logging.config.file" value="WEB-INF/logging.properties"/>
+# </system-properties>
+#
+
+# Set the default logging level for all loggers to WARNING
+.level = WARNING

war/WEB-INF/web.xml

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+<?xml version="1.0" encoding="utf-8" standalone="no"?><web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.5" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
+	<servlet>
+		<servlet-name>file_upload</servlet-name>
+		<servlet-class>com.df.angularfileupload.FileUpload</servlet-class>
+	</servlet>
+	<servlet-mapping>
+		<servlet-name>file_upload</servlet-name>
+		<url-pattern>/upload</url-pattern>
+	</servlet-mapping>
+	<welcome-file-list>
+		<welcome-file>index.html</welcome-file>
+	</welcome-file-list>
+ <servlet>
+  <servlet-name>SystemServiceServlet</servlet-name>
+  <servlet-class>com.google.api.server.spi.SystemServiceServlet</servlet-class>
+  <init-param>
+   <param-name>services</param-name>
+   <param-value/>
+  </init-param>
+ </servlet>
+ <servlet-mapping>
+  <servlet-name>SystemServiceServlet</servlet-name>
+  <url-pattern>/_ah/spi/*</url-pattern>
+ </servlet-mapping>
+</web-app>

war/common.css

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+/** Add css rules here for your application. */
+
+
+/** Example rules used by the template application (remove for your app) */
+h1 {
+  font-size: 2em;
+  font-weight: bold;
+  color: #777777;
+  margin: 40px 0px 70px;
+  text-align: center;
+}
+
+.sendButton {
+  display: block;
+  font-size: 16pt;
+}
+
+/** Most GWT widgets already have a style name defined */
+.gwt-DialogBox {
+  width: 400px;
+}
+
+.dialogVPanel {
+  margin: 5px;
+}
+
+.serverResponseLabelError {
+  color: red;
+}
+
+/** Set ids using widget.getElement().setId("idOfElement") */
+#closeButton {
+  margin: 15px 6px 6px;
+}

war/index.html

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+<!doctype html>
+<html>
+  <head>
+    <meta http-equiv="content-type" content="text/html; charset=UTF-8">
+    <link type="text/css" rel="stylesheet" href="common.css">
+    <title>Angular file upload sample</title>
+    <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.0.7/angular.js"></script>
+  </head>
+
+  <body>
+	<script src="js/angular-file-upload.js"></script>
+
+    <h1>Angular file upload sample</h1>
+    <h3>Visit <a href="https://github.com/danialfarid/angular-file-upload">angular-file-upload</a> on github</h3>
+
+    <div ng-app="fileUpload" ng-controller="MyCtrl">
+      Input to be sent along with the file: <input type="text" ng-model="input">
+      <br/>
+      <input type="file" ng-file-select="onFileSelect($files)" >
+      <input type="file" ng-file-select="onFileSelect($files)" multiple>
+      <br/>
+      Selected Files:
+      <ol>
+        <li ng-repeat="f in selectedFiles">
+          {{f.name}} - size: {{f.size}}B - type: {{f.type}}
+        </li>
+      </ol>
+      <br/>
+      Server Response: 
+      <ul>
+      	<li style="font-size:smaller;color:grey" ng-repeat="result in uploadResult" ng-bind-html-unsafe="result"></li>
+      </ul>
+    </div>
+
+    <script type="text/javascript">
+    	//if FileAPI.min.js is located somewhere different than angular-file-upload.js file add the following
+    	/*    	
+    	FileAPI = {
+    			staticPath: 'path/to/FileAPI.min.js/directory/'
+    	}
+    	*/
+	    angular.module('fileUpload', ['angularFileUpload']);
+
+	    var MyCtrl = ['$scope', '$http', function ($scope, $http) {
+
+	        $scope.selectedFiles = [];
+
+	        $scope.onFileSelect = function ($files) {
+	        	$scope.uploadResult = [];
+	            $scope.selectedFiles = $files;
+	            for (var i = 0; i < $files.length; i++) {
+	            	var $file =$files[i]; 
+		            $http.uploadFile({
+		                url: 'upload',
+		                data: {input: $scope.input},
+		                file: $file
+		            }).success(function (data, status, headers, config) {
+		                $scope.uploadResult.push(data.toString());
+		                // to fix IE not refreshing the model
+		                if (!$scope.$$phase) {
+		                    $scope.$apply();
+		                }
+		            });
+	            }
+	        }
+	    }];
+	</script>
+  </body>
+</html>