richlist:Shuttle的应用
最近在JSF的开发中使用了richfaces插件，使用了其便捷的标签插件：
其中richlist:Shuttle就是一个比较好用的标签，以下讲其标签的具体应用的测试实例：
首先在backbean中需要做以下配置：
?<managed-bean>
????? <managed-bean-name>testShuffle</managed-bean-name>
???? <managed-bean-class>demo.controller.TestShuffle</managed-bean-class>
???? <managed-bean-scope>session</managed-bean-scope>
??</managed-bean>
<converter>
?????? <converter-id>Shuttleconverter</converter-id>
?????? <converter-class>demo.bean.Converter</converter-class>
</converter>
TestShuffle是用来实现生成List的action：
public class TestShuffle {
?
?private List<ShuffleItem> sourceList = new ArrayList<ShuffleItem>();
?private List<ShuffleItem> targetList = new ArrayList<ShuffleItem>();
?ApplicationContext context = new ClassPathXmlApplicationContext("classpath:applicationContext.xml");
?IUserDAO userdao = (UserDAO)context.getBean("userDao");
?public List<ShuffleItem> getSourceList() {
??return sourceList;
?}
?public void setSourceList(List<ShuffleItem> sourceList) {
??this.sourceList = sourceList;
?}
?public List<ShuffleItem> getTargetList() {
??return targetList;
?}
?public void setTargetList(List<ShuffleItem> targetList) {
??this.targetList = targetList;
?}
?
public String getRichList(){
??
?? List list = userdao.getNames();
? ?for(int i = 0;i < list.size();i++){
???? HashMap paramMap = (HashMap)list.get(i);
??? ?ShuffleItem item = new ShuffleItem();
?? ?item.setName(paramMap.get("NAME").toString());
?? ?sourceList.add(item);
??}
??return "richList";//转向testRichfacesShuffle.xhtml
?}
/*
*此方法用于测试TargetList取到的值
*/????
??public String getTargetValue(){
??? ?
??? ? System.out.println("targetList.size()="+this.getTargetList().size());
??? ??System.out.println("the value in targetList is:");
??? ??for(int i=0;i < this.getTargetList().size();i++){
??? ?? ?System.out.println(targetList.get(i).getName());
??? ?}
??????? return null;
?}
展示List的界面testRichfacesShuffle.xhtml：
?<?xml version="1.0" encoding="gb2312"?>
<!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:ui="http://java.sun.com/jsf/facelets"
????? xmlns:h="http://java.sun.com/jsf/html"
????? xmlns:f="http://java.sun.com/jsf/core"
????? xmlns:rich="http://richfaces.org/rich"
????? xmlns:a4j="http://richfaces.org/a4j"
????? xmlns:t="http://myfaces.apache.org/tomahawk"
????? xmlns:c="http://java.sun.com/jstl/core">
????? <!--引用统一的模板-->
?? <ui:composition template="pages/templates/Demotemplate.xhtml">
??? ??<!--header区域-->
???<ui:define name="pageHeader">测试rich:listShuttle的取值</ui:define>
???<!--body区域-->
???<ui:define name="body">
??
?????? <h:form>?
?????<h:messages>
??????<f:facet name="errorMessage"></f:facet>
?????</h:messages>
?????<rich:listShuttle var="items"
???????sourceValue="#{testShuffle.sourceList}"
???????targetValue="#{testShuffle.targetList}"
???????targetRequired="true"
???????converter="Shuttleconverter"
???????sourceCaptionLabel="备选字段" targetCaptionLabel="已选字段"
???????listsHeight="200"
???????????????????????????? sourceListWidth="130"
???????????????????????????? targetListWidth="130" >
???????<rich:column width="50">
?????????????????? ?<h:outputText value="#{items.name}"></h:outputText>
?????????????? ?</rich:column>
?????</rich:listShuttle>
?????<h:commandButton action="#{testShuffle.getTargetValue}" value="下一步"? />
??????</h:form>
???</ui:define>
?? </ui:composition>
</html>?
注意：此处的?converter需要自己实现；以下是实现的代码：
首先：定义Converter.java类:
public class Converter implements javax.faces.convert.Converter{
?public Object getAsObject(FacesContext context, UIComponent component,
???String value) {
??return new ShuffleItem(value);
?}
?public String getAsString(FacesContext context, UIComponent component,
???Object value) {
??ShuffleItem optionItem = (ShuffleItem) value;
??return optionItem.getName();
?}
}
其次是ShuffleItem .java：
public class ShuffleItem {
?
private String name;
public ShuffleItem(){
}
public ShuffleItem(String name) {
?super();
?this.name = name;
}
public String getName() {
?return name;
}
public void setName(String name) {
?this.name = name;
}
@Override
public int hashCode() {
?final int prime = 31;
?int result = 1;
?result = prime * result + ((name == null) ? 0 : name.hashCode());
?return result;
}
@Override
public boolean equals(Object obj) {
?if (this == obj)
??return true;
?if (obj == null)
??return false;
?if (getClass() != obj.getClass())
??return false;
?ShuffleItem other = (ShuffleItem) obj;
?if (name == null) {
??if (other.name != null)
???return false;
?} else if (!name.equals(other.name))
??return false;
?return true;
}
}
必须要实现转换器（converter）才能在列表间移动数据的时候分别取得源列表和目标列表的值！
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