1
我很新的JSF,并试图实现使用<ui:repeat>
分页。我正在使用@ViewScoped
,但目前我的状态未保存。每次支持bean重置页面信息并且不显示下一页。附上源代码以供参考。怎么做分页的JSF 2
WorkItemList.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">
<ui:composition xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:c="http://java.sun.com/jsp/jstl/core"
template="/WEB-INF/template/default.xhtml">
<ui:define name="content">
<h:form id="form">
<ui:repeat value="#{repeatPaginator.model}" var="listItem">
<div>
<h:outputText value="#{listItem}"/>
</div>
</ui:repeat>
<h:commandButton value="< prev" action="#{repeatPaginator.prev}"/>
<h:outputText value="#{repeatPaginator.pageIndex}/#{repeatPaginator.pages}"/>
<h:commandButton value="next >" action="#{repeatPaginator.next}"/>
<h:inputHidden value="#{repeatPaginator.pageIndex}"/>
</h:form>
</ui:define>
</ui:composition>
辅助Bean - RepeatPaginator.java
package test;
@ManagedBean
@ViewScoped
public class RepeatPaginator implements Serializable{
private static final long serialVersionUID = 1L;
private static final int DEFAULT_RECORDS_NUMBER = 2;
private static final int DEFAULT_PAGE_INDEX = 1;
private TestDelegate delegate;
private int records;
private int recordsTotal;
private int pageIndex;
private int pages;
private List<String> model;
public RepeatPaginator() {
delegate = new TestDelegate();
this.records = DEFAULT_RECORDS_NUMBER;
this.pageIndex = DEFAULT_PAGE_INDEX;
// Get Model
this.model = delegate.fetchCurrentList(getFirst(), getFirst()+records);
this.recordsTotal = delegate.getListSize();
if (records > 0) {
pages = records <= 0 ? 1 : recordsTotal/records;
if (recordsTotal % records > 0) {
pages++;
}
if (pages == 0) {
pages = 1;
}
} else {
records = 1;
pages = 1;
}
updateModel();
}
public void updateModel() {
int fromIndex = getFirst();
int toIndex = getFirst() + records;
if(toIndex > this.recordsTotal) {
toIndex = this.recordsTotal;
}
setModel(delegate.fetchCurrentList(fromIndex, toIndex));
}
public void next() {
if(this.pageIndex < pages) {
this.pageIndex++;
}
updateModel();
}
public void prev() {
if(this.pageIndex > 1) {
this.pageIndex--;
}
updateModel();
}
public int getRecords() {
return records;
}
public int getRecordsTotal() {
return recordsTotal;
}
public int getPageIndex() {
return pageIndex;
}
public int getPages() {
return pages;
}
public int getFirst() {
return (pageIndex * records) - records;
}
public List<String> getModel() {
if(model==null)
updateModel();
return model;
}
public void setModel(List<String> model) {
this.model = model;
}
public void setPageIndex(int pageIndex) {
this.pageIndex = pageIndex;
}
}
代表 - TestDelegate.java
@ViewScoped
public class TestDelegate {
private List<String> list = new ArrayList<String>();
public TestDelegate()
{
this.list.add("Item 1");
this.list.add("Item 2");
this.list.add("Item 3");
this.list.add("Item 4");
this.list.add("Item 5");
this.list.add("Item 6");
this.list.add("Item 7");
this.list.add("Item 8");
this.list.add("Item 9");
this.list.add("Item 10");
this.list.add("Item 11");
}
public List<String> fetchCurrentList(int from, int to)
{
return list.subList(from, to);
}
public int getListSize()
{
return this.list.size();
}
}
感谢您的答案dognose,我已将代码移至'@PostConstruct'方法。但我仍然有这个问题。我试图调试代码,我可以看到在点击“Next”时,'@PostConstruct'内的模型仍然是NULL,而不是具有来自之前状态的值。你能解释一下为什么会出现这种情况吗? – Adwin 2014-10-06 19:22:01
我想通了..我错误地使用'@named'和'@managedbean'..现在它的工作正常..感谢您的快速反应。 – Adwin 2014-10-06 19:47:59
@Adwin不客气。 ps .:如果你对此感到满意,你可以接受答案作为正确的解决方案。 (激励有帮助的人:P) – dognose 2014-10-06 19:54:13