一个JSF例子 —Java教程网

刚进项目组，就开始学习JSF------JavaServer Faces，关于JSF，在理论方面懂的也不多，让我们从实践环节开始：

注意：我的J2EE配置是JDK 1.5 + Eclipes 3.2 + MyEclipes 5.5 ，其中内嵌了对JSF的支持。

第一步：打开MyEclipse，选择File--->New--->Project--->WebProject，单击Next，输入项目名称jsfDemo，确定；

第二步：右键选中刚才新建的项目jsfDemo，在下拉菜单中选择MyEclipse，在右边弹出的菜单中选择“Add JSF Facelets Ability”，此时，系统会为我们在项目中自动加入JSF RI 1.1.01 Libraies包，并在WEB-INF中自动添加faces-config.xml配置文件和html_basic.tld和jsf_core.tld模式文件。

第三步：在项目的src文件夹中单击右键，添加Package ，然后在此包中添加Class，或者直接添加Class，此时系统会提示我们必须为此类指定包名。我们在src中添加了一个包com.kumon.test，并在此包中添加了三个后台代码文件：Book.java，BookList.java，SimulateDB.java，其中SimulateDB是模拟的用来连接底层数据库的一个类。

其中Book.java的源代码如下：

package com.kumon.jsfdemo;

import java.util.Map;
import javax.faces.event.ActionEvent;
import javax.faces.component.UIParameter;
import javax.faces.context.*;

public class Book {
    private long id;
    private String author;
    private String title;
    private boolean available;

    /*
     * default Constructor
     */
    public Book() {}

    /*
     * New Constructor with Parameters
     */
    public Book(long id, String author, String title, boolean available) {
        this.id = id;
        this.author = author;
        this.title = title;
        this.available = available;
    }

    public String getAuthor() {
        return author;
    }
    public void setAuthor(String author) {
        this.author = author;
    }

    public boolean isAvailable() {
        return available;
    }
    public void setAvailable(boolean available) {
        this.available = available;
    }

    public long getId() {
        return id;
    }
    public void setId(long id) {
        this.id = id;
    }

    public String getTitle() {
        return title;
    }
    public void setTitle(String title) {
        this.title = title;
    }

    /*
     * The set method of Class
     */
    public void setBook(Book book){
        this.setId(book.getId());
        this.setAuthor(book.getAuthor());
        this.setTitle(book.getTitle());
        this.setAvailable(book.isAvailable());
    }

    /*
     * The get method of Class
     */
    public Book getBook(){
        return new Book(this.getId(),this.getAuthor(),this.getTitle(),this.isAvailable());
    }

    /*
     * The event of iniitiasize a book
     */
    public void initBook(ActionEvent event){
        this.setBook(new Book());
    }

    /*
     * The event of find a book by id
     */
    public void selectBook(ActionEvent event){
        SimulateDB simulateDB = new SimulateDB();
        Map session = FacesContext.getCurrentInstance().getExternalContext().getSessionMap();
        UIParameter component = (UIParameter)event.getComponent().findComponent("editId");
        long id = Long.parseLong(component.getValue().toString());
        this.setBook(simulateDB.loadBookById(id, session));
    }

    /*
     * The event of save a new book to Collection and return the id of this new book
     */
    public void saveBook(ActionEvent event){
        SimulateDB simulateDB = new SimulateDB();
        Map session = FacesContext.getCurrentInstance().getExternalContext().getSessionMap();
        simulateDB.saveToDB(this.getBook(), session);
    }

    /*
     * The event of delete a book by the id of this book
     */
    public void deleteBook(ActionEvent event){
        SimulateDB simulateDB = new SimulateDB();
        Map session = FacesContext.getCurrentInstance().getExternalContext().getSessionMap();
        UIParameter component = (UIParameter)event.getComponent().findComponent("deleteId");
        long id = Long.parseLong(component.getValue().toString());
        simulateDB.deleteBookById(id, session);
    }
}

BookList.java的源代码如下：

package com.kumon.jsfdemo;

import java.util.Collection;
import java.util.Map;
import javax.faces.context.*;

public class BookList {
    Collection books;

    /*
     * Get all book from the Collection
     */
    public Collection getBooks(){
        SimulateDB simulateDB = new SimulateDB();
        Map session = FacesContext.getCurrentInstance().getExternalContext().getSessionMap();
        books = simulateDB.getAllBooks(session);
        return books;
    }

    /*
     * Set the books of the Collection
     */
    public void setBooks(Collection books){
        this.books = books;
    }
}

最后SimulateDB.java的源代码如下：
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