richfaces排序

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml" xmlns:ui="http://java.sun.com/jsf/facelets" xmlns:h="http://java.sun.com/jsf/html" xmlns:f="http://java.sun.com/jsf/core" xmlns:a4j="http://richfaces.org/a4j" xmlns:rich="http://richfaces.org/rich"><head><meta http-equiv="Content-Type" content="text/html" /><title>SEPARATOR</title></head><body>  <f:view><h:form> <rich:dataTable id="table" value="#{itemList.items}" var="row" rows="15"> <rich:columns value="#{itemList.columns}" var="column" index="i" sortBy="#{row[column]}" id="column#{i}" sortOrder="#{itemList.sortOrder[column]}"> <f:facet name="header"> <h:outputText value="#{column}" /> </f:facet> <h:outputText value="#{row[column]}" /> </rich:columns> </rich:dataTable></h:form></f:view> </body></html>

import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import java.util.UUID;  public class ItemList {  private String[] columns = {"name", "uuid"};  private Map<String, Object> sortOrder = new HashMap<String, Object>();  public Map<String, Object> getSortOrder() { return sortOrder; }  private List<Item> items;  public ItemList() { items = new ArrayList<Item>(); for (int i = 0; i < 30; i++) { Item item = new Item(); item.setName("Name " + i); item.setUuid(UUID.randomUUID().toString()); items.add(item); } }  public List<Item> getItems() { return items; }  public void checkAll() { for (Item item : items) { item.setFlag(true); } } public void uncheckAll() { for (Item item : items) { item.setFlag(false); } }  public String[] getColumns() { return columns; }}public class Item { private boolean flag;  private String name;  private String uuid;  /** * @return the uuid */ public String getUuid() { return uuid; }  /** * @param uuid the uuid to set */ public void setUuid(String uuid) { this.uuid = uuid; }  /** * @return the flag */ public boolean isFlag() { return flag; }  /** * @param flag the flag to set */ public void setFlag(boolean flag) { this.flag = flag; }  /** * @return the name */ public String getName() { return name; }  /** * @param name the name to set */ public void setName(String name) { this.name = name; } }

private Map<String, Object> sortOrder = new HashMap<String, Object>();... for(...) {sortOrder.put(columnName, Ordering.UNSORTED);}