{"id":20460,"date":"2018-01-16T16:15:44","date_gmt":"2018-01-16T14:15:44","guid":{"rendered":"http:\/\/www.webcodegeeks.com\/?p=20460"},"modified":"2018-01-15T12:10:55","modified_gmt":"2018-01-15T10:10:55","slug":"angularjs-backend-example","status":"publish","type":"post","link":"https:\/\/www.webcodegeeks.com\/javascript\/angular-js\/angularjs-backend-example\/","title":{"rendered":"AngularJS with Backend Example"},"content":{"rendered":"<p>Hello readers, in this basic example, developers will learn what <strong>AngularJS<\/strong> is and how to make <em>AJAX<\/em> calls to a Servlet using the AngularJS controller and update the view back with the <em>JSON<\/em> response from the Servlet.<\/p>\n<h2>1. Introduction<\/h2>\n<h3>1.1 What is AngularJS?<\/h3>\n<p><em>AngularJS<\/em> is a JavaScript MVC or Model-View-Controller framework developed by Google that lets developers build well structured, easily testable, and maintainable front-end applications. Before we start with creating an actual application using AngularJS, let us see what the actual parts of an AngularJS application are.<br \/>\n[ulp id=&#8217;LXJcMJZXSsqGXYW8&#8242;]<\/p>\n<h4>1.1.1 Templates<\/h4>\n<p>In AngularJS, a <span style=\"text-decoration: underline;\">template<\/span> is an <code>HTML<\/code> with additional markups. AngularJS library compiles the templates and renders the resultant <code>HTML<\/code> page.<\/p>\n<h4>1.1.2 Directives<\/h4>\n<p><span style=\"text-decoration: underline;\">Directives<\/span> are the markers (i.e. attributes) on a DOM element that tell AngularJS to attach a specific behavior to that DOM element or even transform the DOM element and its children. Most of the directives in AngularJS library starts with the <code>ng<\/code>. The directives consist of the following three parts:<\/p>\n<ul>\n<li><code>ng-app<\/code>: The <code>ng-app<\/code> directive is a <em>starting point<\/em>. If the AngularJS framework finds the <code>ng-app<\/code> directive anywhere in the <code>HTML<\/code> document, it bootstraps (i.e. initializes) itself and compiles the <code>HTML<\/code> template<\/li>\n<li><code>ng-model<\/code>: The <code>ng-model<\/code> directive binds an <code>HTML<\/code> element to a property on the <code>$scope<\/code> object. It also binds the values of AngularJS application data to the <code>HTML<\/code> input controls.<\/li>\n<li><code>ng-bind<\/code>: The <code>ng-bind<\/code> directive binds the AngularJS application data to the <code>HTML<\/code> tags<\/li>\n<li><code>ng-controller<\/code>: The <code>ng-controller<\/code> directive is used to specify a controller in the <code>HTML<\/code> element. This controller will add behavior or maintain the data in that <code>HTML<\/code> element and its child elements<\/li>\n<\/ul>\n<h4>1.1.3 Expressions<\/h4>\n<p>An <span style=\"text-decoration: underline;\">expression<\/span> is like a JavaScript code which is usually wrapped inside the double curly braces such as <code>{{ expression }}<\/code>. AngularJS library evaluates the expression and produces a result.<\/p>\n<p>The following table lists all the important concepts in AngularJS library.<\/p>\n<table>\n<thead>\n<tr>\n<th><strong>Concept<\/strong><\/th>\n<th><strong>Description<\/strong><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Template<\/strong><\/td>\n<td>An <code>HTML<\/code> with additional markups.<\/td>\n<\/tr>\n<tr>\n<td><strong>Directives<\/strong><\/td>\n<td>Extends the <code>HTML<\/code> with the custom attributes (or markers) and elements.<\/td>\n<\/tr>\n<tr>\n<td><strong>Model<\/strong><\/td>\n<td>It is the data shown to the user in the view with which the user interacts.<\/td>\n<\/tr>\n<tr>\n<td><strong>Scope<\/strong><\/td>\n<td>A Scope is a context where the model is stored so that controllers, directives, and expressions can access it.<\/td>\n<\/tr>\n<tr>\n<td><strong>Expressions<\/strong><\/td>\n<td>An expression executes the JavaScript code inside the double curly braces such as <code>{{ expression }}<\/code>.<\/td>\n<\/tr>\n<tr>\n<td><strong>Compiler<\/strong><\/td>\n<td>The Compiler parses the template and instantiates the directives and expressions.<\/td>\n<\/tr>\n<tr>\n<td><strong>Filter<\/strong><\/td>\n<td>A Filter formats the value of an expression for display to the user.<\/td>\n<\/tr>\n<tr>\n<td><strong>Data Binding<\/strong><\/td>\n<td>This syncs the data between the model and the view.<\/td>\n<\/tr>\n<tr>\n<td><strong>Controller<\/strong><\/td>\n<td>A controller in AngularJS maintains the application data, business logic, and behavior using the <code>$scope<\/code> object. Developers can attach properties and methods to the <code>$scope<\/code> object inside a controller function, which in turn will add or update the data and attach behaviours to the <code>HTML<\/code> elements.<\/td>\n<\/tr>\n<tr>\n<td><strong>Module<\/strong><\/td>\n<td>The module is the container for different parts of an application including the controllers, services, filters, and directives which configures the Injector.<\/td>\n<\/tr>\n<tr>\n<td><strong>Service<\/strong><\/td>\n<td>A Service is reusable business logic which is independent of the views.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>1.2 Why should we use AngularJS?<\/h3>\n<p>Using the Model-View-Controller architecture, the framework separates a web application into a simple and yet manageable structure, which comprises of \u201cviews\u201d, \u201cmodels\u201d and \u201ccontrollers\u201d. The AngularJS library provides the in-build directives (or attributes) to extend the <code>HTML<\/code> inside a web page. When developers attach these directives to the <code>HTML<\/code> elements and attributes, it creates a dynamic web-page with very little coding.<\/p>\n<p>These new APIs make a developer life easier, really! But it would be difficult for a beginner to understand this without an example. Therefore, let\u2019s see how to integrate AngularJS in Java web applications.<\/p>\n<h2>2. AngularJS with Backend Example<\/h2>\n<p>Here is a step-by-step guide for implementing the AngularJS framework in Java.<\/p>\n<h3>2.1 Tools Used<\/h3>\n<p>We are using Eclipse Kepler SR2, JDK 8 and Maven.<\/p>\n<h3>2.2 Project Structure<\/h3>\n<p>Firstly, let\u2019s review the final project structure, in case you are confused about where you should create the corresponding files or folder later!<\/p>\n<figure id=\"attachment_20461\" aria-describedby=\"caption-attachment-20461\" style=\"width: 340px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_structure_guide_1_new.jpg\"><img decoding=\"async\" class=\"wp-image-20461 size-full\" src=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_structure_guide_1_new.jpg\" alt=\"Fig. 1: Application Project Structure\" width=\"340\" height=\"467\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_structure_guide_1_new.jpg 340w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_structure_guide_1_new-218x300.jpg 218w\" sizes=\"(max-width: 340px) 100vw, 340px\" \/><\/a><figcaption id=\"caption-attachment-20461\" class=\"wp-caption-text\">Fig. 1: Application Project Structure<\/figcaption><\/figure>\n<h3>2.3 Project Creation<\/h3>\n<p>This section will demonstrate on how to create a Java-based Maven project with Eclipse. In Eclipse Ide, go to <code>File -&gt; New -&gt; Maven Project<\/code>.<\/p>\n<figure id=\"attachment_20462\" aria-describedby=\"caption-attachment-20462\" style=\"width: 657px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_guide_1_new.jpg\"><img decoding=\"async\" class=\"wp-image-20462 size-full\" src=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_guide_1_new.jpg\" alt=\"Fig. 2: Create Maven Project\" width=\"657\" height=\"690\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_guide_1_new.jpg 657w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_guide_1_new-286x300.jpg 286w\" sizes=\"(max-width: 657px) 100vw, 657px\" \/><\/a><figcaption id=\"caption-attachment-20462\" class=\"wp-caption-text\">Fig. 2: Create Maven Project<\/figcaption><\/figure>\n<p>In the New Maven Project window, it will ask you to select project location. By default, &#8216;Use default workspace location&#8217; will be selected. Just click on next button to proceed.<\/p>\n<figure id=\"attachment_20463\" aria-describedby=\"caption-attachment-20463\" style=\"width: 598px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_guide_2_new.jpg\"><img decoding=\"async\" class=\"wp-image-20463 size-full\" src=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_guide_2_new.jpg\" alt=\"Fig. 3: Project Details\" width=\"598\" height=\"543\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_guide_2_new.jpg 598w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_guide_2_new-300x272.jpg 300w\" sizes=\"(max-width: 598px) 100vw, 598px\" \/><\/a><figcaption id=\"caption-attachment-20463\" class=\"wp-caption-text\">Fig. 3: Project Details<\/figcaption><\/figure>\n<p>Select the &#8216;Maven Web App&#8217; Archetype from the list of options and click next.<\/p>\n<figure id=\"attachment_20464\" aria-describedby=\"caption-attachment-20464\" style=\"width: 597px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_guide_3_new.jpg\"><img decoding=\"async\" class=\"wp-image-20464 size-full\" src=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_guide_3_new.jpg\" alt=\"Fig. 4: Archetype Selection\" width=\"597\" height=\"541\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_guide_3_new.jpg 597w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_guide_3_new-300x272.jpg 300w\" sizes=\"(max-width: 597px) 100vw, 597px\" \/><\/a><figcaption id=\"caption-attachment-20464\" class=\"wp-caption-text\">Fig. 4: Archetype Selection<\/figcaption><\/figure>\n<p>It will ask you to &#8216;Enter the group and the artifact id for the project&#8217;. We will input the details as shown in the below image. The version number will be by default: <code>0.0.1-SNAPSHOT<\/code>.<\/p>\n<figure id=\"attachment_20465\" aria-describedby=\"caption-attachment-20465\" style=\"width: 597px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_guide_4_new.jpg\"><img decoding=\"async\" class=\"wp-image-20465 size-full\" src=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_guide_4_new.jpg\" alt=\"Fig. 5: Archetype Parameters\" width=\"597\" height=\"540\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_guide_4_new.jpg 597w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_guide_4_new-300x271.jpg 300w\" sizes=\"(max-width: 597px) 100vw, 597px\" \/><\/a><figcaption id=\"caption-attachment-20465\" class=\"wp-caption-text\">Fig. 5: Archetype Parameters<\/figcaption><\/figure>\n<p>Click on Finish and the creation of a maven project is completed. If you observe, it has downloaded the maven dependencies and a <code>pom.xml<\/code> file will be created. It will have the following code:<\/p>\n<p><span style=\"text-decoration: underline;\"><em>pom.xml<\/em><\/span><\/p>\n<pre class=\"brush:xml; wrap-lines:false;\">&lt;project xmlns=\"http:\/\/maven.apache.org\/POM\/4.0.0\" xmlns:xsi=\"http:\/\/www.w3.org\/2001\/XMLSchema-instance\" xsi:schemaLocation=\"http:\/\/maven.apache.org\/POM\/4.0.0 http:\/\/maven.apache.org\/xsd\/maven-4.0.0.xsd\"&gt;\r\n\t&lt;modelVersion&gt;4.0.0&lt;\/modelVersion&gt;\r\n\t&lt;groupId&gt;AngularJsBackendEx&lt;\/groupId&gt;\r\n\t&lt;artifactId&gt;AngularJsBackendEx&lt;\/artifactId&gt;\r\n\t&lt;version&gt;0.0.1-SNAPSHOT&lt;\/version&gt;\r\n\t&lt;packaging&gt;war&lt;\/packaging&gt;\r\n&lt;\/project&gt;\r\n<\/pre>\n<p>Let\u2019s start building the application!<\/p>\n<h2>3. Application Building<\/h2>\n<p>Let\u2019s create a basic welcome application to understand the basic building blocks of AngularJS library.<\/p>\n<h3>3.1 Maven Dependencies<\/h3>\n<p>Here, we specify the dependencies for the Servlet and JSON API. The rest dependencies will be automatically resolved by the Maven framework and the <strong>updated<\/strong> file will have the following code:<\/p>\n<p><span style=\"text-decoration: underline;\"><em>pom.xml<\/em><\/span><\/p>\n<pre class=\"brush:xml; wrap-lines:false;\">&lt;project xmlns=\"http:\/\/maven.apache.org\/POM\/4.0.0\" xmlns:xsi=\"http:\/\/www.w3.org\/2001\/XMLSchema-instance\"\r\n\txsi:schemaLocation=\"http:\/\/maven.apache.org\/POM\/4.0.0 http:\/\/maven.apache.org\/maven-v4_0_0.xsd\"&gt;\r\n\t&lt;modelVersion&gt;4.0.0&lt;\/modelVersion&gt;\r\n\t&lt;groupId&gt;AngularJsBackendEx&lt;\/groupId&gt;\r\n\t&lt;artifactId&gt;AngularJsBackendEx&lt;\/artifactId&gt;\r\n\t&lt;packaging&gt;war&lt;\/packaging&gt;\r\n\t&lt;version&gt;0.0.1-SNAPSHOT&lt;\/version&gt;\r\n\t&lt;name&gt;AngularJsBackendEx Maven Webapp&lt;\/name&gt;\r\n\t&lt;url&gt;http:\/\/maven.apache.org&lt;\/url&gt;\r\n\t&lt;dependencies&gt;\r\n\t\t&lt;!-- Servlet API Dependency --&gt;\r\n\t\t&lt;dependency&gt;\r\n\t\t\t&lt;groupId&gt;javax.servlet&lt;\/groupId&gt;\r\n\t\t\t&lt;artifactId&gt;javax.servlet-api&lt;\/artifactId&gt;\r\n\t\t\t&lt;version&gt;3.0.1&lt;\/version&gt;\r\n\t\t&lt;\/dependency&gt;\r\n\t\t&lt;dependency&gt;\r\n\t\t\t&lt;groupId&gt;javax.servlet.jsp&lt;\/groupId&gt;\r\n\t\t\t&lt;artifactId&gt;jsp-api&lt;\/artifactId&gt;\r\n\t\t\t&lt;version&gt;2.1&lt;\/version&gt;\r\n\t\t&lt;\/dependency&gt;\r\n\t\t&lt;!-- https:\/\/mvnrepository.com\/artifact\/org.json\/json --&gt;\r\n\t\t&lt;dependency&gt;\r\n\t\t\t&lt;groupId&gt;org.json&lt;\/groupId&gt;\r\n\t\t\t&lt;artifactId&gt;json&lt;\/artifactId&gt;\r\n\t\t\t&lt;version&gt;20160810&lt;\/version&gt;\r\n\t\t&lt;\/dependency&gt;\r\n\t&lt;\/dependencies&gt;\r\n\t&lt;build&gt;\r\n\t\t&lt;finalName&gt;${project.artifactId}&lt;\/finalName&gt;\r\n\t&lt;\/build&gt;\r\n&lt;\/project&gt;\r\n<\/pre>\n<h3>3.2 Java Class Creation<\/h3>\n<p>Let\u2019s create the required Java files. Right-click on <code>src\/main\/java<\/code> folder, <code>New -&gt; Package<\/code>.<\/p>\n<figure id=\"attachment_20466\" aria-describedby=\"caption-attachment-20466\" style=\"width: 691px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_guide_5_new.jpg\"><img decoding=\"async\" class=\"wp-image-20466 size-full\" src=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_guide_5_new.jpg\" alt=\"Fig. 6: Java Package Creation\" width=\"691\" height=\"473\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_guide_5_new.jpg 691w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_guide_5_new-300x205.jpg 300w\" sizes=\"(max-width: 691px) 100vw, 691px\" \/><\/a><figcaption id=\"caption-attachment-20466\" class=\"wp-caption-text\">Fig. 6: Java Package Creation<\/figcaption><\/figure>\n<p>A new pop window will open where we will enter the package name as: <code>com.wcg.angular.backend<\/code>.<\/p>\n<figure id=\"attachment_20467\" aria-describedby=\"caption-attachment-20467\" style=\"width: 517px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_guide_6_new.jpg\"><img decoding=\"async\" class=\"wp-image-20467 size-full\" src=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_guide_6_new.jpg\" alt=\"Fig. 7: Java Package Name (com.wcg.angular.backend)\" width=\"517\" height=\"425\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_guide_6_new.jpg 517w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_guide_6_new-300x247.jpg 300w\" sizes=\"(max-width: 517px) 100vw, 517px\" \/><\/a><figcaption id=\"caption-attachment-20467\" class=\"wp-caption-text\">Fig. 7: Java Package Name (com.wcg.angular.backend)<\/figcaption><\/figure>\n<p>Once the package is created in the application, we will need to create the servlet controller class. Right-click on the newly created package: <code>New -&gt; Class<\/code>.<\/p>\n<figure id=\"attachment_20468\" aria-describedby=\"caption-attachment-20468\" style=\"width: 769px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_guide_7_new.jpg\"><img decoding=\"async\" class=\"wp-image-20468 size-full\" src=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_guide_7_new.jpg\" alt=\"Fig. 8: Java Class Creation\" width=\"769\" height=\"395\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_guide_7_new.jpg 769w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_guide_7_new-300x154.jpg 300w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_guide_7_new-768x394.jpg 768w\" sizes=\"(max-width: 769px) 100vw, 769px\" \/><\/a><figcaption id=\"caption-attachment-20468\" class=\"wp-caption-text\">Fig. 8: Java Class Creation<\/figcaption><\/figure>\n<p>A new pop window will open and enter the file name as: <code>FormServlet<\/code>. The controller class will be created inside the package: <code>com.wcg.angular.backend<\/code>.<\/p>\n<figure id=\"attachment_20469\" aria-describedby=\"caption-attachment-20469\" style=\"width: 533px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_guide_8_new.jpg\"><img decoding=\"async\" class=\"wp-image-20469 size-full\" src=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_guide_8_new.jpg\" alt=\"Fig. 9: Java Class (FormServlet.java)\" width=\"533\" height=\"630\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_guide_8_new.jpg 533w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_guide_8_new-254x300.jpg 254w\" sizes=\"(max-width: 533px) 100vw, 533px\" \/><\/a><figcaption id=\"caption-attachment-20469\" class=\"wp-caption-text\">Fig. 9: Java Class (FormServlet.java)<\/figcaption><\/figure>\n<h4>3.2.1 Implementation of Servlet Controller<\/h4>\n<p>This is a normal Java servlet except the part that it reads the <em>JSON<\/em> payload. As the data in angular is not a part of the parameter, hence developers cannot use the <code>getParameter()<\/code> method in the servlet. Instead, they can get the reader and read all the content before parsing it into the JSON object. Let\u2019s see the simple code snippet that follows this implementation.<\/p>\n<p><span style=\"text-decoration: underline;\"><em>FormServlet.java<\/em><\/span><\/p>\n<pre class=\"brush:java; wrap-lines:false;\">package com.wcg.angular.backend;\r\n\r\nimport java.io.BufferedReader;\r\nimport java.io.IOException;\r\n\r\nimport javax.servlet.ServletException;\r\nimport javax.servlet.annotation.WebServlet;\r\nimport javax.servlet.http.HttpServlet;\r\nimport javax.servlet.http.HttpServletRequest;\r\nimport javax.servlet.http.HttpServletResponse;\r\n\r\nimport org.json.JSONObject;\r\n\r\n@WebServlet(\"\/formServlet\")\r\npublic class FormServlet extends HttpServlet {\r\n\r\n\tprivate static final long serialVersionUID = 1L;\r\n\r\n\t\/**** This Method Is Called By The Servlet Container To Process A 'POST' Request. ****\/\r\n\tpublic void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException {\r\n\t\thandleRequest(req, resp);\r\n\t}\r\n\r\n\tpublic void handleRequest(HttpServletRequest req, HttpServletResponse resp) throws ServletException {\r\n\r\n\t\tString str = null;\t\r\n\t\tStringBuffer sb = null;\r\n\t\tJSONObject jObj = null;\r\n\t\tBufferedReader br = null;\r\n\r\n\t\ttry {\r\n\t\t\tbr = req.getReader();\r\n\t\t\tsb = new StringBuffer();\r\n\r\n\t\t\twhile ((str = br.readLine()) != null) {\r\n\t\t\t\tsb.append(str);\r\n\t\t\t}\r\n\t\t\tjObj = new JSONObject(sb.toString());\r\n\t\t\tString user_name = jObj.getString(\"username\");\r\n\r\n\t\t\t\/**** Preparing The Output Response ****\/\r\n\t\t\tresp.setContentType(\"text\/html\");\r\n\t\t\tresp.setCharacterEncoding(\"UTF-8\");\r\n\t\t\tresp.getWriter().write(\"Welcome \" + user_name + \" !!\");\r\n\t\t} catch (IOException ex) {\r\n\t\t\tex.printStackTrace();\r\n\t\t}\r\n\t}\r\n}\r\n<\/pre>\n<h3>3.3 Creating JSP View<\/h3>\n<p>This file is responsible for the <em>AJAX<\/em> call made to the servlet and for updating the response back in the <code>JSP<\/code>. Let\u2019s see the simple code snippet to create a simple view using the angular framework.<\/p>\n<p><span style=\"text-decoration: underline;\"><em>index.jsp<\/em><\/span><\/p>\n<pre class=\"brush: html; wrap-lines:false;\">&lt;!DOCTYPE html&gt;\r\n&lt;html&gt;\r\n\t&lt;head&gt;\r\n\t    &lt;meta http-equiv=\"Content-Type\" content=\"text\/html; charset=UTF-8\"&gt;\r\n\t    &lt;title&gt;AngularJS Application&lt;\/title&gt;\r\n\t\r\n\t    &lt;!-- Javascript Files --&gt;\r\n\t    &lt;script type=\"text\/javascript\" src=\"resource\/js\/angular_v1.6.0.js\"&gt;&lt;\/script&gt;\t    \t   \r\n\t    &lt;script type=\"text\/javascript\" src=\"resource\/js\/form.js\"&gt;&lt;\/script&gt;\r\n\t\r\n\t    &lt;!-- CSS Styling --&gt;\r\n\t    &lt;style type=\"text\/css\"&gt;\r\n\t        .cssStyling {\r\n\t            color: green;\r\n\t            font-size: larger;\t            \r\n\t        }\r\n\t    &lt;\/style&gt;\r\n\t&lt;\/head&gt;\r\n\t&lt;body&gt;\r\n\t    &lt;h1&gt;AngularJS Backend Application&lt;\/h1&gt;\r\n\t    &lt;div ng-app=\"myApp\"&gt;\r\n\t        &lt;form ng-controller=\"UserController\" ng-submit=\"sendData()\"&gt;\r\n\t            &lt;p&gt;\r\n\t                &lt;label&gt;Enter your name: &lt;\/label&gt;\r\n\t                &lt;input id=\"user_name\" type=\"text\" ng-model=\"name\" placeholder=\"User Name\" onblur=\"this.placeholder = 'User Name'\" onfocus=\"this.placeholder = ''\" \/&gt;\r\n\t            &lt;\/p&gt;\r\n\t            &lt;p&gt;\r\n\t                &lt;button id=\"formBtn\" type=\"submit\"&gt;Submit&lt;\/button&gt;\r\n\t            &lt;\/p&gt;\r\n\t            &lt;!-- Display's Output On The Screen --&gt;\r\n\t            &lt;p&gt;\r\n\t            \t&lt;span id=\"welcomeText\" class=\"cssStyling\"&gt;{{msgFromServlet}}&lt;\/span&gt;\r\n\t        \t&lt;\/p&gt;\r\n\t        &lt;\/form&gt;\t        \r\n\t    &lt;\/div&gt;\r\n\t&lt;\/body&gt;\r\n&lt;\/html&gt;\r\n<\/pre>\n<h4>3.3.1 Creating AngularJS Controller<\/h4>\n<p>The Javascript file i.e. <code>form.js<\/code> includes the function (i.e. <code>UserController<\/code>) as the &#8220;<em>controller<\/em>&#8221; in the Model-View-Controller. It submits the form data to the server and reads back the response message to the <code>$scope.msgFromServlet<\/code>.<\/p>\n<p><span style=\"text-decoration: underline;\"><em>form.js<\/em><\/span><\/p>\n<pre class=\"brush:js; wrap-lines:false;\">\/* \r\n * Description - AngularJS Script for Form Submission\r\n * Created By - Yatin Batra  \r\n * *\/\r\n\r\nvar helloAjaxApp = angular.module(\"myApp\", []);\r\n\r\nhelloAjaxApp.controller(\"UserController\", [ '$scope', '$http', function($scope, $http) {\r\n\r\n\t$http.defaults.headers.post[\"Content-Type\"] = \"application\/x-www-form-urlencoded; charset=utf-8\";\r\n\t$scope.sendData = function() {\r\n\t\t$http({\r\n\t\t\turl : 'formServlet',\r\n\t\t\tmethod : \"POST\",\r\n\t\t\tdata : {\r\n\t\t\t\t'username' : $scope.name\r\n\t\t\t}\r\n\t\t}).then(function(response) {\r\n\t\t\t\/**** Success Case ****\/\r\n\t\t\tconsole.log(\"Success -&gt; \" + response.data);\r\n\t\t\t$scope.msgFromServlet = response.data;\r\n\t\t}, function(response) {\r\n\t\t\t\/**** Failure Case ****\/\r\n\t\t\tconsole.log(\"Failure -&gt; \" + response.data);\r\n\t\t\t$scope.msgFromServlet = response.data;\r\n\t\t});\r\n\t};\r\n} ]);\r\n<\/pre>\n<h2>4. Run the Application<\/h2>\n<p>As we are ready for all the changes, let us compile the project and deploy the application on the Tomcat7 server. To deploy the application on Tomat7, right-click on the project and navigate to <code>Run as -&gt; Run on Server<\/code>.<\/p>\n<figure id=\"attachment_20470\" aria-describedby=\"caption-attachment-20470\" style=\"width: 799px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_deploy_guide_1_new.jpg\"><img decoding=\"async\" class=\"size-full wp-image-20470\" src=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_deploy_guide_1_new.jpg\" alt=\"Fig. 10: How to Deploy Application on Tomcat\" width=\"799\" height=\"661\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_deploy_guide_1_new.jpg 799w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_deploy_guide_1_new-300x248.jpg 300w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_deploy_guide_1_new-768x635.jpg 768w\" sizes=\"(max-width: 799px) 100vw, 799px\" \/><\/a><figcaption id=\"caption-attachment-20470\" class=\"wp-caption-text\">Fig. 10: How to Deploy Application on Tomcat<\/figcaption><\/figure>\n<p>Tomcat will deploy the application in its web-apps folder and shall start its execution to deploy the project so that we can go ahead and test it in the browser.<\/p>\n<h2>5. Project Demo<\/h2>\n<p>Open your favorite browser and hit the following URL. The output page (i.e. the welcome form) will be displayed.<\/p>\n<pre class=\"brush:plain; wrap-lines:false;\">http:\/\/localhost:8082\/AngularJsBackendEx\/\r\n<\/pre>\n<p>Server name (localhost) and port (8082) may vary as per your Tomcat configuration. Developers can debug the example and see what happens after every step. Enjoy!<\/p>\n<figure id=\"attachment_20471\" aria-describedby=\"caption-attachment-20471\" style=\"width: 697px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_demo_guide_1_new.jpg\"><img decoding=\"async\" class=\"size-full wp-image-20471\" src=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_demo_guide_1_new.jpg\" alt=\"Fig. 11: Welcome Page\" width=\"697\" height=\"205\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_demo_guide_1_new.jpg 697w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_demo_guide_1_new-300x88.jpg 300w\" sizes=\"(max-width: 697px) 100vw, 697px\" \/><\/a><figcaption id=\"caption-attachment-20471\" class=\"wp-caption-text\">Fig. 11: Welcome Page<\/figcaption><\/figure>\n<p>The user enters the name of a person and clicks the <em>Submit button. The data will pass as a <code>HTTP<\/code> request using the AngularJS and the servlet will return the response as below.<\/em><\/p>\n<figure id=\"attachment_20472\" aria-describedby=\"caption-attachment-20472\" style=\"width: 661px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_demo_guide_2_new.jpg\"><img decoding=\"async\" class=\"size-full wp-image-20472\" src=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_demo_guide_2_new.jpg\" alt=\"Fig. 12: Greetings Message\" width=\"661\" height=\"241\" srcset=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_demo_guide_2_new.jpg 661w, https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/angular_backend_ex_project_demo_guide_2_new-300x109.jpg 300w\" sizes=\"(max-width: 661px) 100vw, 661px\" \/><\/a><figcaption id=\"caption-attachment-20472\" class=\"wp-caption-text\">Fig. 12: Greetings Message<\/figcaption><\/figure>\n<p>That\u2019s all for this post. Happy Learning!!<\/p>\n<h2>6. Conclusion<\/h2>\n<p>In this section, developers learned how to create a simple AngularJS enabled Java web application. Developers can download the sample application as an Eclipse project in the <a href=\"#projectDownload\">Downloads<\/a> section. I hope this article served you with whatever developers were looking for.<\/p>\n<h2>7. Download the Eclipse Project<\/h2>\n<p>This was an example of AngularJS with Backend implementation.<\/p>\n<div class=\"download\"><strong>Download<\/strong><br \/>\nYou can download the full source code of this example here: <a href=\"http:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2018\/01\/AngularJsBackendEx.zip\" target=\"_blank\" rel=\"noopener\"><strong>AngularJsBackendEx<\/strong><\/a><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Hello readers, in this basic example, developers will learn what AngularJS is and how to make AJAX calls to a Servlet using the AngularJS controller and update the view back with the JSON response from the Servlet. 1. Introduction 1.1 What is AngularJS? AngularJS is a JavaScript MVC or Model-View-Controller framework developed by Google that &hellip;<\/p>\n","protected":false},"author":2162,"featured_media":909,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[25],"tags":[48,266],"class_list":["post-20460","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-angular-js","tag-angular","tag-angularjs"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>AngularJS with Backend Example - Web Code Geeks - 2026<\/title>\n<meta name=\"description\" content=\"Hello readers, in this basic example, developers will learn what AngularJS is and how to integrate AngularJS in Java web applications\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.webcodegeeks.com\/javascript\/angular-js\/angularjs-backend-example\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"AngularJS with Backend Example - Web Code Geeks - 2026\" \/>\n<meta property=\"og:description\" content=\"Hello readers, in this basic example, developers will learn what AngularJS is and how to integrate AngularJS in Java web applications\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.webcodegeeks.com\/javascript\/angular-js\/angularjs-backend-example\/\" \/>\n<meta property=\"og:site_name\" content=\"Web Code Geeks\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/webcodegeeks\" \/>\n<meta property=\"article:published_time\" content=\"2018-01-16T14:15:44+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2014\/10\/angularjs-logo.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"150\" \/>\n\t<meta property=\"og:image:height\" content=\"150\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Yatin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@webcodegeeks\" \/>\n<meta name=\"twitter:site\" content=\"@webcodegeeks\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Yatin\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"11 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.webcodegeeks.com\/javascript\/angular-js\/angularjs-backend-example\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.webcodegeeks.com\/javascript\/angular-js\/angularjs-backend-example\/\"},\"author\":{\"name\":\"Yatin\",\"@id\":\"https:\/\/www.webcodegeeks.com\/#\/schema\/person\/6c946b8aea919fb2cd83fb17268e9367\"},\"headline\":\"AngularJS with Backend Example\",\"datePublished\":\"2018-01-16T14:15:44+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.webcodegeeks.com\/javascript\/angular-js\/angularjs-backend-example\/\"},\"wordCount\":1399,\"commentCount\":3,\"publisher\":{\"@id\":\"https:\/\/www.webcodegeeks.com\/#organization\"},\"image\":{\"@id\":\"https:\/\/www.webcodegeeks.com\/javascript\/angular-js\/angularjs-backend-example\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.webcodegeeks.com\/wp-content\/uploads\/2014\/10\/angularjs-logo.jpg\",\"keywords\":[\"angular\",\"angularjs\"],\"articleSection\":[\"Angular.js\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.webcodegeeks.com\/javascript\/angular-js\/angularjs-backend-example\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.webcodegeeks.com\/javascript\/angular-js\/angularjs-backend-example\/\",\"url\":\"https:\/\/www.webcodegeeks.com\/javascript\/angular-js\/angularjs-backend-example\/\",\"name\":\"AngularJS with Backend Example - 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