Java apache wicket example

Java apache wicket example

I apologize for the confusion earlier! Here's an example of using Apache Wicket to create a simple web application in Java:

Let's say we want to build a simple web page that displays a list of books, allows users to search for books by title or author, and enables them to add new books. We'll use Apache Wicket as our framework.

First, let's set up the project structure:

project/
app.java
book.java
BookListView.java
SearchForm.java
AddBookForm.java
WicketApplication.java
web/
index.html
styles.css
script.js
WEB-INF/
wicket.xml
log4j.properties

Now, let's dive into the code!

Book class:

public class Book {
private int id;
private String title;
private String author;
public Book(int id, String title, String author) {
this.id = id;
this.title = title;
this.author = author;
}
public int getId() { return id; }
public String getTitle() { return title; }
public String getAuthor() { return author; }
}

WicketApplication:

public class WicketApplication extends WebApplication {
@Override
protected void init() {
// Set the book list view as the default page
getHomePage().setDefaultPage(BookListView.class);
}
}

BookListView:

public class BookListView extends ListView {
public BookListView(IModel<Iterable> model) {
super(model, new BookItemRenderer());
}
@Override
protected void populateItem(ListItem item) {
// Render a list item with the book title and author
item.add(new Label("title", new PropertyModel<>(item.getModelObject(), "getTitle")));
item.add(new Label("author", new PropertyModel<>(item.getModelObject(), "getAuthor")));
}
}

SearchForm:

public class SearchForm extends Form {
private final TextField titleField = new TextField<>("title");
private final TextField authorField = new TextField<>("author");
public SearchForm() {
add(titleField);
add(authorField);
}
@Override
protected void onSubmit() {
// Get the search query from the form fields
String titleQuery = titleField.getModelObject();
String authorQuery = authorField.getModelObject();
// Filter the book list based on the search query
List books = BookService.getBooks().stream()
.filter(book -> book.getTitle().contains(titleQuery) || book.getAuthor().contains(authorQuery))
.collect(Collectors.toList());
// Set the filtered book list as the new model object
setResponsePage(new SearchResultsPage(books));
}
}

AddBookForm:

public class AddBookForm extends Form {
private final TextField titleField = new TextField<>("title");
private final TextField authorField = new TextField<>("author");
public AddBookForm() {
add(titleField);
add(authorField);
}
@Override
protected void onSubmit() {
// Get the book details from the form fields
String title = titleField.getModelObject();
String author = authorField.getModelObject();
// Create a new Book object and add it to the database
BookService.addBook(new Book(0, title, author));
// Set the "success" message as the response
setResponsePage(new SuccessMessagePage("Book added successfully!"));
}
}

Wicket configuration file (wicket.xml):

</wicket:configuration>

Web page template (index.html):

Book Library




Add a new book

This is just a basic example to get you started. You'll need to implement the BookService class to handle database operations, and add more functionality as needed.

I hope this helps! Let me know if you have any questions or need further clarification.

What is Apache Java?

I'm happy to respond in English!

Apache Java, also known as OpenJDK (Open Java Development Kit), is a free and open-source implementation of the Java programming language and platform. It was originally based on Sun Microsystems' JDK (Java Development Kit) but has since become an independent project with its own development team and governance structure.

The Apache Software Foundation (ASF) began developing OpenJDK in 2007, aiming to create a community-driven alternative to Oracle's commercial Java implementation. The project's primary goal was to provide a stable, reliable, and customizable platform for building Java-based applications, ensuring that the language remained open and free from vendor lock-in.

Apache Java is designed to be compatible with Oracle's JDK (Java Development Kit) and provides similar features and functionalities. It includes tools like javac (the Java compiler), jarsigner (a utility for signing JAR files), and jstack (a tool for dumping thread stacks). The project also maintains a wide range of libraries, utilities, and frameworks, such as the Apache Harmony JVM (Java Virtual Machine) and the Apache Tomcat web server.

One significant advantage of OpenJDK is that it allows developers to modify and customize the Java platform according to their needs. This openness encourages innovation, fosters community engagement, and enables organizations to create bespoke Java-based solutions tailored to their specific requirements.

In recent years, Apache Java has gained popularity as a viable alternative to Oracle's commercial JDK, particularly in industries where open-source software is preferred or required. For instance:

In summary, Apache Java is an open-source implementation of the Java programming language and platform, offering a free, customizable, and community-driven alternative to Oracle's commercial JDK. Its flexibility, compatibility, and open nature make it an attractive choice for various industries and applications.