JavaCro'14 - Building interactive web applications with Vaadin – Peter Lehto
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This document provides an overview of Vaadin, an open-source web application framework that allows developers to build rich web applications using pure Java code. Key points covered include: Vaadin uses a client-server architecture with a Java backend and GWT frontend; the app lifecycle and how UI instances are managed; common patterns for structuring apps using views and navigation; building responsive layouts; server push for real-time updates; data binding between fields and data models; and how to get started with Vaadin.
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JavaCro'14 - Building interactive web applications with Vaadin – Peter Lehto
- 1. Vaadin 7Building web applications Peter Lehto Vaadin Expert
- 5. ?
- 8. User interface framework for Rich Internet Applications with pure Java
- 10. Vaadin += GWT
- 11. Why?
- 14. App Lifecycle
- 17. Vaadin Loader page Loads theme Loads widgetset Fetch root configuration
- 18. New UI instance is created UI.init() is called
- 19. public class MyVaadinUI extends UI { ! @WebServlet(value = "/*", asyncSupported = true) @VaadinServletConfiguration(productionMode = false, ui = MyVaadinUI.class) public static class Servlet extends VaadinServlet { } ! @Override protected void init(VaadinRequest request) { } }
- 20. public class MyVaadinUI extends UI { ! @WebServlet(value = "/*", asyncSupported = true) @VaadinServletConfiguration(productionMode = false, ui = MyVaadinUI.class) public static class Servlet extends VaadinServlet { } ! @Override protected void init(VaadinRequest request) { VerticalLayout layout = new VerticalLayout(); ! final TextField textField = new TextField("Name"); final Button button = new Button("Greet"); ! layout.addComponents(textField, button); ! setContent(layout); } }
- 21. public class MyVaadinUI extends UI { ! @WebServlet(value = "/*", asyncSupported = true) @VaadinServletConfiguration(productionMode = false, ui = MyVaadinUI.class) public static class Servlet extends VaadinServlet { } ! @Override protected void init(VaadinRequest request) { VerticalLayout layout = new VerticalLayout(); ! final TextField textField = new TextField("Name"); final Button button = new Button("Greet"); ! layout.addComponents(textField, button); ! setContent(layout); ! button.addClickListener(new Button.ClickListener() { @Override public void buttonClick(ClickEvent event) { Notification.show("Hello " + textField.getValue()); } }); } }
- 22. Vaadin UIDL • UI is added to the DOM
- 23. Vaadin
- 25. public class MyVaadinUI extends UI { ! … ! @Override protected void init(VaadinRequest request) { … ! button.addClickListener(new Button.ClickListener() { @Override public void buttonClick(ClickEvent event) { Notification.show("Hello " + textField.getValue()); } }); } }
- 26. Vaadin UIDL
- 28. No user activity? 3 heartbeats are missed? UI is detached
- 29. closeIdleSession=true Session timeout expires after last non-heartbeat request Session and all of its UIs are closed
- 30. VaadinServlet HttpSession VaadinSession n active users UI 1 n 1 1 1 n Resources 1 ** 1 1 servlet
- 31. UI instance can be preserved between refreshes with @PreserveOnRefresh annotation
- 33. View: any logical collection of components Structuring the App
- 34. Navigation between views is done by exchanging the content of the UI or by replacing components in a layout Structuring the App
- 35. public class CustomersView extends CustomComponent implements com.vaadin.navigator.View { ! @Override public void enter(ViewChangeEvent event) { } ! } Structuring the App public class InvoicesView extends CustomComponent implements com.vaadin.navigator.View { ! @Override public void enter(ViewChangeEvent event) { } ! }
- 36. Structuring the App @Override protected void init(VaadinRequest request) { VerticalLayout layout = new VerticalLayout(); setContent(layout); Navigator navigator = new Navigator(this, layout); navigator.addView("customers", CustomerView.class); navigator.addView("invoices", InvoicesView.class); ! … }
- 38. http://localhost:8080/vaadin/#!customers ! #! : Navigator identifier customers : View name Navigating to a view via URL
- 40. Building Responsive Layouts public class DashBoard extends CssLayout implements com.vaadin.navigator.View { ! public DashBoard() { setSizeFull(); addStyleName("dashboard"); Responsive.makeResponsive(this); }
- 42. Server @Push
- 44. Request-response cycle with polling ServerClient Poll Poll State Click Progress Indicator Server @Push
- 45. Request-response cycle with push ServerClient State Click Progress Indicator Server @Push
- 46. To use push Always use locking with UI.access(Runnable) or VaadinSession.lock() when modifying the UI from an external thread Annotate UI with @Push Include vaadin-push JAR in your project Server @Push
- 47. Technical details Manually managed pushing also available Fallback to the best supported push method: Long polling or Streaming Implemented with the Atmosphere library using WebSockets Server @Push
- 49. Examples of Fields Field Data binding
- 50. Fields are bound to Properties which are simple objects with type and value
- 51. public class Customer { private String name; private Date birthDate; private Address address; ! public String getName() { return name; } ! public void setName(String name) { this.name = name; } public Date getBirthDate() { return birthDate; } ! public void setBirthDate(Date birthDate) { this.birthDate = birthDate; } ! public Address getAddress() { return address; } ! public void setAddress(Address address) { this.address = address; } }
- 52. Customer customer = getCustomer(); TextField nameField = new TextField(); MethodProperty<String> nameProperty = new MethodProperty<String>(customer, "name"); ! nameField.setPropertyDataSource(nameProperty); Field Data binding
- 54. Customer customer = getCustomer(); ! TextField nameField = new TextField(); BeanItem<Customer> customerBean = new BeanItem<Customer>(customer); nameField.setPropertyDataSource(customerBean.getItemProperty("name")); Field Data binding
- 55. FieldGroup is used to bind multiple properties from Item Field Data binding
- 56. Customer customer = getCustomer(); BeanItem<Customer> customerItem = new BeanItem<Customer>(customer); FieldGroup fieldGroup = new FieldGroup(customerItem); fieldGroup.bind(new TextField(), "name"); fieldGroup.bind(new PopupDateField(), "birthDate"); Field Data binding
- 57. Fields are Buffered and can be Committed and Discarded Field Data binding
- 58. Customer customer = getCustomer(); BeanItem<Customer> customerItem = new BeanItem<Customer>(customer); FieldGroup fieldGroup = new FieldGroup(customerItem); fieldGroup.bind(new TextField(), "name"); fieldGroup.bind(new PopupDateField(), “birthDate"); ! fieldGroup.commit(); Field Data binding
- 59. commit() Buffering Data source UI Logic Field Button Browser TextField value change Save button pressed ClickEvent
- 62. Field Data binding Collection<Customer> customers = getCustomers(); BeanItemContainer<Customer> customerContainer = new BeanItemContainer<Customer>(Customer.class, customers); Table customersTable = new Table(); ! customersTable.setContainerDataSource(customerContainer, Arrays.asList("name", "birthDate"));
- 63. How do I get started ?
- 64. Eclipse Download plugin from Marketplace How do I get started ?
- 65. IntelliJ IDEA Built-in support How do I get started ?
- 66. Netbeans Download plugin Netbeans Plugin Portal How do I get started ?
- 67. mvn archetype:generate -DarchetypeGroupId= com.vaadin -DarchetypeArtifactId= vaadin-archetype- application -DarchetypeVersion= 7.1.15 Maven How do I get started ?
- 69. Download for Free vaadin.com/book > 600 pages 01 -93-1970-1 PDF, ePub, HTML
- 70. Ohloh #2 used Java Web Framework Community of 100.000+
- 71. By Marko Grönroos ABOUT VAADIN .dzone.comGetMoreRefcardz!Visitrefcardz.com#85 Getting Started with Vaadin CONTENTS INCLUDE: About Vaadin Creating An Application Components Layout Components Themes Data Binding and more... Vaadin is a server-side Ajax web application development framework that allows you to build web applications just like with traditional desktop frameworks, such as AWT or Swing. An application is built from user interface components contained hierarchically in layout components. In the server-driven model, the application code runs on a server, while the actual user interaction is handled by a client-side engine running in the browser. The client-server communications and any client-side technologies, such as HTML and JavaScript, are invisible to the developer. As the client-side engine runs as JavaScript in the browser, there is no need to install plug-ins. Vaadin is released under the Apache License 2.0. Figure 1: Vaadin Client-Server Architecture If the built-in selection of components is not enough, you can Figure 2: Architecture for Vaadin Applications Hot Tip You can get a reference to the application object from any component attached to the application with Event Listeners In the event-driven model, user interaction with user interface components triggers server-side events, which you can handle Web Browser Client-Side Engine Java Web Server Vaadin UI Components Your Java Application Web Service EJB DB Servlet Container User Application Event Listener Data Model Application Themes Application Resources Default Theme File Resources External Resources Database Data Binding Inherits Events Changes AJAX Requests Inherits UI Component Java Servlet Application Class Web Browser Client-Side Engine brought to you by...