以下代码显示如何使用DataModel对DataTable进行排序。
以下代码来自demo.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"
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>
以下代码来自table-style.css。
.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;
}
下面的代码来自UserBean.java。
package cn..common;
import java.io.Serializable;
import java.math.BigDecimal;
import java.util.Comparator;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
import javax.faces.model.ArrayDataModel;
import javax.faces.model.DataModel;
import java.util.Arrays;
import java.util.Comparator;
import javax.faces.model.DataModel;
@ManagedBean(name="book")
@SessionScoped
public class UserBean implements Serializable{
private static final long serialVersionUID = 1L;
private SortableDataModel<Book> sotableDataModel;
private boolean sortAscending = true;
private static final Book[] bookList = {
new Book("1", "CSS",new BigDecimal("1500.00"), 3),
new Book("2", "HTML",new BigDecimal("421.00"), 6),
new Book("3", "Java",new BigDecimal("5222.00"), 10),
new Book("4", "Javascript",new BigDecimal("1111.00"), 9),
new Book("5", "SQL",new BigDecimal("211.00"), 20)
};
public UserBean(){
sotableDataModel = new SortableDataModel<Book>(new ArrayDataModel<Book>(bookList));
}
public DataModel<Book> getBookList() {
return sotableDataModel;
}
//sort by book no
public String sortByBookNo() {
if(sortAscending){
sotableDataModel.sortBy(new Comparator<Book>() {
@Override
public int compare(Book o1, Book o2) {
return o1.getBookNo().compareTo(o2.getBookNo());
}
});
sortAscending = false;
}else{
//descending book
sotableDataModel.sortBy(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;
}
}
}
class SortableDataModel<E> extends DataModel<E>{
DataModel<E> model;
private Integer[] rows;
SortableDataModel(DataModel<E> model){
this.model = model;
initRows();
}
public void initRows(){
int rowCount = model.getRowCount();
if(rowCount != -1){
this.rows = new Integer[rowCount];
for(int i = 0; i < rowCount; ++i){
rows[i] = i;
}
}
}
public void sortBy(final Comparator<E> comparator){
Comparator<Integer> rowComp = new Comparator<Integer>() {
public int compare(Integer i1, Integer i2){
E o1 = getData(i1);
E o2 = getData(i2);
return comparator.compare(o1, o2);
}
};
Arrays.sort(rows, rowComp);
}
private E getData(int row){
int originalRowIndex = model.getRowIndex();
model.setRowIndex(row);
E newRowData = model.getRowData();
model.setRowIndex(originalRowIndex);
return newRowData;
}
@Override
public void setRowIndex(int rowIndex) {
if(0 <= rowIndex && rowIndex < rows.length){
model.setRowIndex(rows[rowIndex]);
}else{
model.setRowIndex(rowIndex);
}
}
@Override
public boolean isRowAvailable() {
return model.isRowAvailable();
}
@Override
public int getRowCount() {
return model.getRowCount();
}
@Override
public E getRowData() {
return model.getRowData();
}
@Override
public int getRowIndex() {
return model.getRowIndex();
}
@Override
public Object getWrappedData() {
return model.getWrappedData();
}
@Override
public void setWrappedData(Object data) {
model.setWrappedData(data);
initRows();
}
}
下载 DataTable_Sort_DataModel.zip将生成的WAR文件从目标文件夹复制到Tomcat部署文件夹，并运行Tomcat-Install-folder/bin/startup.bat。
Tomcat完成启动后，在浏览器地址栏中键入以下URL。
http://localhost:8080/simple-webapp/demo.xhtml
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