JSF数据表(h:dataTable)排序数据

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2023-03-14

JSF中有一个叫作DataTable的控件，可用来渲染和格式化html表格。使用DataTable，我们可以迭代收集或数组数组来显示数据。下面我们来学习如何向DataTable排序数据。

要使用DataTable，我们需要添加以下HTML头。

<html 
   xmlns="http://www.w3.org/1999/xhtml"   
   xmlns:h="http://java.sun.com/jsf/html">
</html>

以下JSF标签 -

<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标签。

<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>

JSF数据表更新行数据实例

打开 NetBeans IDE 创建一个Web工程：DataTableSort，其目录结构如下所示 -

创建以下文件代码，文件：index.xhtml 的代码内容如下所示 -

<?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:c="http://java.sun.com/jsp/jstl/core"
      >
    <h:head>
      <h:outputStylesheet library="css" name="table-style.css"  />
    </h:head>
    <h:body>

      <h1>JSF 2 dataTable sorting 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">
              <h:commandLink action="#{book.sortByBookNo}">
                Book No
              </h:commandLink>
            </f:facet>
            #{o.bookNo}
          </h:column>

          <h:column>
            <f:facet name="header">
                Product Name
          </f:facet>
            #{o.productName}
          </h:column>

          <h:column>
            <f:facet name="header">Price</f:facet>
            #{o.price}
          </h:column>

          <h:column>
            <f:facet name="header">Quantity</f:facet>
            #{o.qty}
          </h:column>

        </h:dataTable>
        </h:form>

    </h:body>
</html>

文件：User.java 的代码内容如下所示 -

/*
 * 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 java.util.Collections;
import java.util.Comparator;
import java.util.List;
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 List<Book> bookArrayList;

    private boolean sortAscending = true;

    private static final Book[] bookList = {
        new Book("1234", "Java", new BigDecimal("2303.0"), 3),
        new Book("3211", "Web", new BigDecimal("4232.00"), 6),
        new Book("2344", "SQL", new BigDecimal("5230.00"), 10),
        new Book("5643", "CSS", new BigDecimal("11320.00"), 9),
        new Book("4565", "HTML", new BigDecimal("232.00"), 20)
    };

    public User() {

        bookArrayList = new ArrayList<Book>(Arrays.asList(bookList));

    }

    public List<Book> getBookList() {

        return bookArrayList;

    }

    //sort by book no
    public String sortByBookNo() {
        if (sortAscending) {
            //ascending book
            Collections.sort(bookArrayList, new Comparator<Book>() {
                @Override
                public int compare(Book o1, Book o2) {
                    return o1.getBookNo().compareTo(o2.getBookNo());
                }
            });
            sortAscending = false;
        } else {
            //descending book
            Collections.sort(bookArrayList, new Comparator<Book>() {
                @Override
                public int compare(Book o1, Book o2) {
                    return o2.getBookNo().compareTo(o1.getBookNo());
                }
            });
            sortAscending = true;
        }
        return null;
    }

    public static class Book {

        String bookNo;
        String productName;
        BigDecimal price;
        int qty;

        public Book(String bookNo, String productName,
                BigDecimal price, int qty) {
            this.bookNo = bookNo;
            this.productName = productName;
            this.price = price;
            this.qty = qty;
        }

        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;
        }

    }
}

文件：table-style.css 的代码内容如下所示 -

.book-table-header{
  bbook-bottom:1px solid #BBB;
  padding:16px;
}

.book-table-odd-row{
  bbook-top:1px solid #BBB;
}

.book-table-even-row{
  bbook-top:1px solid #BBB;
}

右键运行工程：DataTableSort，如果没有任何错误，打开浏览器访问：

http://localhost:8084/DataTableSort/

应该会看到以下结果 -

在上图中，您可以点击”Book No“，就可以看到排序情况了。