JSF中有一個叫作DataTable的控件，可用來渲染和格式化html表格。使用DataTable，我們可以迭代收集或數(shù)組數(shù)組來顯示數(shù)據(jù)。下面我們來學(xué)習(xí)如何向DataTable更新數(shù)據(jù)。
要使用DataTable，我們需要添加以下HTML頭。
<html
xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://java.sun.com/jsf/html">
</html>
以下JSF標(biāo)簽 -
<h:dataTable value="#{userData.employees}" var="employee"
styleClass="employeeTable"
headerClass="employeeTableHeader"
rowClasses="employeeTableOddRow,employeeTableEvenRow">
<h:column>
<f:facet name="header">Name</f:facet>
#{employee.name}
</h:column>
<h:column>
<f:facet name="header">Department</f:facet>
#{employee.department}
</h:column>
<h:column>
<f:facet name="header">Age</f:facet>
#{employee.age}
</h:column>
<h:column>
<f:facet name="header">Salary</f:facet>
#{employee.salary}
</h:column>
</h:dataTable>
被渲染成以下HTML標(biāo)簽。
<table class="employeeTable">
<thead><tr>
<th class="employeeTableHeader" scope="col">Name</th>
<th class="employeeTableHeader" scope="col">Department</th>
<th class="employeeTableHeader" scope="col">Age</th>
<th class="employeeTableHeader" scope="col">Salary</th>
</tr></thead>
<tbody>
<tr class="employeeTableOddRow">
<td>Tom</td>
<td>Marketing</td>
<td>10</td>
<td>2000.0</td>
</tr>
<tr class="employeeTableEvenRow">
<td>Robert</td>
<td>Marketing</td>
<td>15</td>
<td>1000.0</td>
</tr>
</table>
打開 NetBeans IDE 創(chuàng)建一個Web工程：DataTableUpdate，其目錄結(jié)構(gòu)如下所示 -
![JSF數(shù)據(jù)表更新行數(shù)據(jù)實例]
創(chuàng)建以下文件代碼，文件：index.xhtml 的代碼內(nèi)容如下所示 -
<?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"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:ui="http://java.sun.com/jsf/facelets"
>
<h:head>
<h:outputStylesheet library="css" name="table-style.css" />
</h:head>
<h:body>
<h1>JSF 2 dataTable example</h1>
<h:form>
<h:dataTable value="#{book.bookList}" var="o"
styleClass="book-table"
headerClass="book-table-header"
rowClasses="book-table-odd-row,book-table-even-row"
>
<h:column>
<f:facet name="header">Book No</f:facet>
<h:inputText value="#{o.bookNo}" size="10" rendered="#{o.editable}" />
<h:outputText value="#{o.bookNo}" rendered="#{not o.editable}" />
</h:column>
<h:column>
<f:facet name="header">Product Name</f:facet>
<h:inputText value="#{o.productName}" size="20" rendered="#{o.editable}" />
<h:outputText value="#{o.productName}" rendered="#{not o.editable}" />
</h:column>
<h:column>
<f:facet name="header">Price</f:facet>
<h:inputText value="#{o.price}" size="10" rendered="#{o.editable}" />
<h:outputText value="#{o.price}" rendered="#{not o.editable}" />
</h:column>
<h:column>
<f:facet name="header">Quantity</f:facet>
<h:inputText value="#{o.qty}" size="5" rendered="#{o.editable}" />
<h:outputText value="#{o.qty}" rendered="#{not o.editable}" />
</h:column>
<h:column>
<f:facet name="header">Action</f:facet>
<h:commandLink value="Edit" action="#{book.editAction(o)}" rendered="#{not o.editable}" />
</h:column>
</h:dataTable>
<h:commandButton value="Save Changes" action="#{book.saveAction}" />
</h:form>
</h:body>
</html>
文件：User.java 的代碼內(nèi)容如下所示 -
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package com.yiibai;
/**
*
* @author Maxsu
*/
import java.io.Serializable;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.Arrays;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
@ManagedBean(name = "book")
@SessionScoped
public class User implements Serializable {
private static final long serialVersionUID = 1L;
private static final ArrayList<Book> bookList
= new ArrayList<Book>(Arrays.asList(
new Book("1", "CSS", new BigDecimal("722.22"), 1),
new Book("2", "HTML", new BigDecimal("533.33"), 2),
new Book("3", "Java", new BigDecimal("11444.44"), 8),
new Book("4", "Javascript", new BigDecimal("5255.55"), 3),
new Book("5", "SQL", new BigDecimal("166.66"), 10)
));
public ArrayList<Book> getBookList() {
return bookList;
}
public String saveAction() {
//get all existing value but set "editable" to false
for (Book book : bookList) {
book.setEditable(false);
}
//return to current page
return null;
}
public String editAction(Book book) {
book.setEditable(true);
return null;
}
public static class Book {
String bookNo;
String productName;
BigDecimal price;
int qty;
boolean editable;
public Book(String bookNo, String productName, BigDecimal price, int qty) {
this.bookNo = bookNo;
this.productName = productName;
this.price = price;
this.qty = qty;
}
public boolean isEditable() {
return editable;
}
public void setEditable(boolean editable) {
this.editable = editable;
}
public String getBookNo() {
return bookNo;
}
public void setBookNo(String bookNo) {
this.bookNo = bookNo;
}
public String getProductName() {
return productName;
}
public void setProductName(String productName) {
this.productName = productName;
}
public BigDecimal getPrice() {
return price;
}
public void setPrice(BigDecimal price) {
this.price = price;
}
public int getQty() {
return qty;
}
public void setQty(int qty) {
this.qty = qty;
}
}
}
右鍵運行工程：DataTableUpdate，如果沒有任何錯誤，打開瀏覽器訪問：
http://localhost:8084/DataTableUpdate/
應(yīng)該會看到以下結(jié)果 -
在上圖中，您可以點擊某個項，并保存。
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