Struts2 扩展标签之分页标签 PageTag
扩展一个分页标签
(1)
扩展：org.apache.struts2.views.jsp.ComponentTagSupport
一个扩展类 ExtTag
分页标签
(2)
扩展控件：org.apache.struts2.components.Component
分页控件
(3)
标签tld描述
(4)
页面调用
(1)
扩展：org.apache.struts2.views.jsp.ComponentTagSupport
一个扩展类 ExtTag
public class ExtTag extends ComponentTagSupport{
/**
* 样式
*/
protected String theme;
/**
* id
*/
protected String id;
public String getTheme() {
return theme;
}
public void setTheme(String theme) {
this.theme = theme;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
@Override
public Component getBean(ValueStack arg0, HttpServletRequest arg1,
HttpServletResponse arg2) {
return null;
}
}
分页标签
public class PageTag extends ExtTag{
/**
* 每页大小
*/
private String pagesize;
/**
* 总记录数
*/
private String total;
/**
* 当前页
*/
private String currentpage;
/**
* url
*/
private String url;
/**
*url类别
*/
private String urlType;
/**
* 单位名称
*/
private String unit;
@Override
public Component getBean(ValueStack arg0, HttpServletRequest arg1,
HttpServletResponse arg2) {
super.populateParams();
return new Page(arg0);
}
/**
* 传递参数
*/
protected void populateParams() {
super.populateParams();
Page page = (Page)component;
page.setCurrentpage(currentpage);
page.setId(id);
page.setPagesize(pagesize);
page.setTheme(theme);
page.setTotal(total);
page.setUrl(url);
page.setUrlType(urlType);
page.setUnit(unit);
}
public String getPagesize() {
return pagesize;
}
public void setPagesize(String pagesize) {
this.pagesize = pagesize;
}
public String getTotal() {
return total;
}
public void setTotal(String total) {
this.total = total;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public String getUrlType() {
return urlType;
}
public void setUrlType(String urlType) {
this.urlType = urlType;
}
public String getCurrentpage() {
return currentpage;
}
public void setCurrentpage(String currentpage) {
this.currentpage = currentpage;
}
public String getUnit() {
return unit;
}
public void setUnit(String unit) {
this.unit = unit;
}
}
(2)
扩展控件：org.apache.struts2.components.Component
public class ExtComponent extends Component{
public ExtComponent(ValueStack arg0) {
super(arg0);
}
/**
* 样式
*/
protected String theme;
/**
* id
*/
protected String id;
public String getTheme() {
return theme;
}
public void setTheme(String theme) {
this.theme = theme;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
}
分页控件
public class Page extends ExtComponent{
/**
* 每页大小
*/
private String pagesize;
/**
* 总记录数
*/
private String total;
/**
* 当前页
*/
private String currentpage;
/**
* url
*/
private String url;
/**
*url类别
*/
private String urlType;
/**
* @param stack
*/
/**
* 单位名称
*/
private String unit;
public Page(ValueStack arg0) {
super(arg0);
}
/**
*
*/
public boolean start(Writer writer) {
try {
StringBuffer html = new StringBuffer();
int _pagesize = 15;
if (!CheckUtil.isNullOrEmpty(pagesize)) {
_pagesize = StringUtil.parsetoInt(pagesize, 15);
}
int _total = StringUtil.parsetoInt(total, 0);
int _currentpage = StringUtil.parsetoInt(currentpage, 1);
if (_currentpage < 1) {
_currentpage = 1;
}
int _totalPage = (int)Math.ceil(_total * 1.0f/_pagesize);
if (CheckUtil.isNullOrEmpty(unit)) {
unit = "条";
}
html.append("<div class=\"fer_pager");
if (!CheckUtil.isNullOrEmpty(theme)) {
html.append(" " + theme);
}
html.append("\" ");
if (!CheckUtil.isNullOrEmpty(id)) {
html.append(" id=\"" + id + "\"");
}
html.append(">");
html.append("<ul class=\"kptturnpage pagerpanel\">");
html.append("<li class=\"ntotal\">当前第<i class=\"currentpage\">" + _currentpage + "</i>页/共<i>" + _totalPage + "</i>页 每页<i>" + _pagesize + "</i>" + unit + "/共<i class=\"totalNum\">" + _total +"</i>" + unit + "</li>");
if (_totalPage > 0) {
if (_currentpage <= 1){
html.append("<li class=\"nfirst\"><a title=\"第一页\"></a></li>");
html.append("<li class=\"nprevior\"><a title=\"上一页\"></a></li>");
}
else {
html.append("<li class=\"first\"><a " + go("第一页", 1, url)+ "></a></li>");
int _previosPage = _currentpage - 1 > 0? (_currentpage - 1):1;
html.append("<li class=\"previor\"><a " + go("上一页", _previosPage, url)+ "></a></li>");
}
if (_currentpage >= _totalPage) {
html.append("<li class=\"nnext\"><a title=\"下一页\" href=\"javascript:void(0);\"></a></li>");
html.append("<li class=\"nlast\"><a title=\"末页\" href=\"javascript:void(0);\"></a></li>");
}
else {
int _nextPage = _currentpage + 1 <= _totalPage? (_currentpage + 1): _totalPage;
html.append("<li class=\"next\"><a " + go("下一页", _nextPage, url)+ "></a></li>");
html.append("<li class=\"last\"><a " + go("末页", _totalPage, url)+ "></a></li>");
}
}
html.append("</ul></div>");
writer.write(html.toString());
} catch (Exception e) {
e.printStackTrace();
}
return true;
}
/**
* 跳转到哪一页
*/
private String go(String title, int page,String url){
StringBuffer sb = new StringBuffer();
sb.append(" title=\"" + title + "\" ");
if (CheckUtil.isNullOrEmpty(url)) {
sb.append(" href=\"javascript:void(0);\" ");
sb.append(" onclick=\"PAS.page.go(" + page+")\" ");
}
else {
sb.append(" href=\"");
sb.append(url);
if (url.indexOf('?') > -1) {
sb.append("&");
}
else {
sb.append("?");
}
sb.append("page=" + page);
sb.append("\"");
}
return sb.toString();
}
public String getPagesize() {
return pagesize;
}
public void setPagesize(String pagesize) {
this.pagesize = pagesize;
}
public String getTotal() {
return total;
}
public void setTotal(String total) {
this.total = total;
}
public String getCurrentpage() {
return currentpage;
}
public void setCurrentpage(String currentpage) {
this.currentpage = currentpage;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public String getUrlType() {
return urlType;
}
public void setUrlType(String urlType) {
this.urlType = urlType;
}
public String getUnit() {
return unit;
}
public void setUnit(String unit) {
this.unit = unit;
}
}
(3)
标签tld描述
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE taglib PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN" "http://java.sun.com/dtd/web-jsptaglibrary_1_2.dtd">
<taglib>
<tlib-version>2.2.3</tlib-version>
<jsp-version>1.2</jsp-version>
<short-name>ext</short-name>
<uri>/ext-tages</uri>
<display-name>"Ext Tags"</display-name>
<!-- 分页标签 -->
<tag>
<name>page</name>
<tag-class>***.PageTag</tag-class>
<body-content>empty</body-content>
<attribute>
<name>pagesize</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>total</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>currentpage</name>
<required>true</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>url</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>urlType</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>theme</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>id</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
</tag>
</taglib>
(4)
页面调用
<%@taglib uri="/WEB-INF/tags/ext-tags.tld" prefix="ext" %>
<ext:page total="${total}" currentpage="${page}" pagesize="${pagesize}"/>