Java apache wicket example

Java apache wicket example

I'd be happy to provide an example of using Apache Wicket in a Java application!

Apache Wicket is a mature, open-source web framework for Java that allows you to build fast, flexible, and scalable web applications. Here's an example of how you can use Wicket to create a simple web page that displays a list of books:

Let's assume we have a Book class with the following properties: id, title, and author.

public class Book {
private int id;
private String title;
private String author;
// getters and setters
}

To display a list of books using Wicket, you would first create a BookListView component that extends Wicket's ListView class:

import org.apache.wicket.markup.html.WebPage;
import org.apache.wicket.markup.html.list.ListItem;
import org.apache.wicket.markup.html.list.ListView;
import org.apache.wicket.model.Model;
public class BookListView extends ListView {
public BookListView(Model<List> model, String id) {
super(model, id);
}
@Override
protected void populateItem(ListItem item) {
WebPage page = new WebPage();
item.add(new BookPanel(item.getModelObject()));
}
}

The BookListView component uses a custom panel to render each book:

public class BookPanel extends Panel {
public BookPanel(Model model) {
super(model);
add(new Label("title", model.getObject().getTitle()));
add(new Label("author", model.getObject().getAuthor()));
}
}

In the above example, we're using Wicket's Label component to display the book title and author.

Now let's create a BookListPage that uses our custom BookListView component:

public class BookListPage extends WebPage {
public BookListPage() {
add(new BookListView(new CompoundModel(), "book-list"));
}
}

Finally, let's create a Wicket application that uses the above components:

import org.apache.wicket.Application;
import org.apache.wicket.core.request.mapper.DefaultPageMapper;
public class MyWicketApplication extends Application {
@Override
protected Class<? extends WebPage> getHomePage() {
return BookListPage.class;
}
}

In this example, we've created a simple web application that displays a list of books using Wicket. We've used custom components to render each book and to display the list.

Please note that this is just an example and does not include any actual database queries or error handling. You would need to modify the code to suit your specific use case.

I hope this helps! Let me know if you have any questions.

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.