Jon*_*han 17 iteration collections jsf loops jsf-2
我是JSF的新手,在学习构建在线书店应用程序的过程中.
我有1个班级和1个豆子:Book.java和BookCatelogBean.java.Book类有3个属性:id,title和author它相应的getter和setter.该BookCatelogBean包含ArrayList<Book>在那里我用填充它Books(在将来,我将它连接到数据库).
我有两页:index.xhtml和book.xhtml.我想显示index.xhtml每个格式为REST链接的书名列表及其ID book.xhtml,如下所示:<h:link outcome="book?id=#{bookCatelogBean.id}" value="#{bookCatelogBean.title}" />
我知道如何使用BookCatelogBean显示1,book但我想显示所有这些？我有一个想法,调用一个方法来BookCatelogBean调用getAllBooks(),返回每个书籍标题,但我如何将它们中的每一个返回到index.xhtml作为JavaserverFace链接而不是字符串？
谢谢
这是我的代码:
Book.java
package bookshop;
import java.io.Serializable;
public class Book implements Serializable {
private int id;
private String title;
private String author;
public Book(int id, String title, String author){
this.title = title;
this.id = id;
this.author = author;
}
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
}
BookCatelogBean.java
package bookshop;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Arrays;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
@ManagedBean
@SessionScoped
public class BookCatelogBean implements Serializable {
private int currentItem = 0;
private ArrayList<Book> books = new ArrayList<Book>(Arrays.asList(
new Book(1, "Theory of Money and Credit", "Ludwig von Mises"),
new Book(2, "Man, Economy and State", "Murry Rothbard"),
new Book(3, "Real Time Relationships", "Stefan Molyneux")));
public String getTitle(){
return books.get(currentItem).getTitle();
}
public int getId(){
return books.get(currentItem).getId();
}
public String getAuthor(){
return books.get(currentItem).getAuthor();
}
}
的index.xhtml
<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://java.sun.com/jsf/html">
<h:head>
<title>BookShop</title>
</h:head>
<h:body>
<h:link outcome="book?id=#{bookCatelogBean.id}" value="#{bookCatelogBean.title}" />
</h:body>
</html>
Bal*_*usC 33
JSF2提供了两个迭代组件:<ui:repeat>和<h:dataTable>.前者对响应没有任何反应(因此您可以100%控制最终的HTML输出),而后者则将HTML呈现<table>给响应,并且需要<h:column>表示一列<td>s.两个组件都可以List<E>作为值.
所以,你可以让你的托管bean如下:
@ManagedBean
@RequestScoped
public class BookCatalog implements Serializable {
private List<Book> books;
@PostConstruct
public void init() {
books = new ArrayList<Book>();
books.add(new Book(1, "Theory of Money and Credit", "Ludwig von Mises"));
books.add(new Book(2, "Man, Economy and State", "Murry Rothbard"));
books.add(new Book(3, "Real Time Relationships", "Stefan Molyneux"));
}
public List<Book> getBooks() {
return books;
}
}
你可以<ui:repeat>用来生成例如<ul><li>:
<ul>
<ui:repeat value="#{bookCatalog.books}" var="book">
<li>
<h:link value="#{book.title}" outcome="book">
<f:param name="id" value="#{book.id}" />
</h:link>
</li>
</ui:repeat>
</ul>
(请注意,该var属性基本上将当前迭代的项目暴露给组件内EL范围内的给定名称)
而这里是如何使用一个<h:dataTable>代替:
<h:dataTable value="#{bookCatalog.books}" var="book">
<h:column>
<h:link value="#{book.title}" outcome="book">
<f:param name="id" value="#{book.id}" />
</h:link>
</h:column>
</h:dataTable>
至于JSTL <c:forEach>,这也很有可能,但你应该记住,JSTL标签的生命周期与JSF组件不同.长话短说:JSF2 Facelets中的JSTL ......有道理吗？
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