struts2的自定义分页标签
struts2的自定义分页标签
1.写分页标签的相关支持类
Java代码1.package com.lowca.activity.expand.struts;
2.
3.import javax.servlet.http.HttpServletRequest;
4.import javax.servlet.http.HttpServletResponse;
5.
6.import org.apache.struts2.components.UIBean;
7.
8.import com.opensymphony.xwork2.util.ValueStack;
9.
10.public class Pagebar extends UIBean {
11.
12. protected String totalRecord;
13. protected String totalPage;
14. protected String pageNo;
15. protected String url;
16. protected String style;
17.
18. public String getTotalRecord() {
19. return totalRecord;
20. }
21.
22. public void setTotalRecord(String totalRecord) {
23. this.totalRecord = totalRecord;
24. }
25.
26. public String getTotalPage() {
27. return totalPage;
28. }
29.
30. public void setTotalPage(String totalPage) {
31. this.totalPage = totalPage;
32. }
33.
34. public String getPageNo() {
35. return pageNo;
36. }
37.
38. public void setPageNo(String pageNo) {
39. this.pageNo = pageNo;
40. }
41.
42. public String getUrl() {
43. return url;
44. }
45.
46. public void setUrl(String url) {
47. this.url = url;
48. }
49.
50. public String getStyle() {
51. return style;
52. }
53.
54. public void setStyle(String style) {
55. this.style = style;
56. }
57.
58. public Pagebar(ValueStack stack, HttpServletRequest request,
59. HttpServletResponse response) {
60. super(stack, request, response);
61. }
62.
63. @Override
64. protected String getDefaultTemplate() {
65. return "pagebar_" + style.toLowerCase();
66. }
67.
68. @Override
69. protected void evaluateExtraParams() {
70. super.evaluateExtraParams();
71. addParameter("totalRecord", findString(totalRecord));
72. addParameter("totalPage", findString(totalPage));
73. addParameter("pageNo", findString(pageNo));
74. addParameter("url", findString(url));
75. addParameter("style", style);
76. }
77.
78.}Java代码1.package com.lowca.activity.expand.struts;
2.
3.import javax.servlet.http.HttpServletRequest;
4.import javax.servlet.http.HttpServletResponse;
5.
6.import org.apache.struts2.components.Component;
7.import org.apache.struts2.components.UIBean;
8.import org.apache.struts2.views.jsp.ui.AbstractUITag;
9.
10.import com.opensymphony.xwork2.util.ValueStack;
11.
12.public class PagebarTag extends AbstractUITag {
13.
14. private static final long serialVersionUID = 1L;
15. protected String totalRecord;
16. protected String totalPage;
17. protected String pageNo;
18. protected String url;
19. protected String style = "basic";
20.
21. @Override
22. public Component getBean(ValueStack stack, HttpServletRequest request,
23. HttpServletResponse response) {
24. return new Pagebar(stack, request, response);
25. }
26.
27. protected void populateParams() {
28. super.populateParams();
29. Pagebar pagebar = (Pagebar) component;
30. pagebar.setTotalRecord(totalRecord);
31. pagebar.setTotalPage(totalPage);
32. pagebar.setPageNo(pageNo);
33. pagebar.setUrl(url);
34. pagebar.setStyle(style);
35. }
36.
37. public String getTotalRecord() {
38. return totalRecord;
39. }
40.
41. public void setTotalRecord(String totalRecord) {
42. this.totalRecord = totalRecord;
43. }
44.
45. public String getTotalPage() {
46. return totalPage;
47. }
48.
49. public void setTotalPage(String totalPage) {
50. this.totalPage = totalPage;
51. }
52.
53. public String getPageNo() {
54. return pageNo;
55. }
56.
57. public void setPageNo(String pageNo) {
58. this.pageNo = pageNo;
59. }
60.
61. public String getUrl() {
62. return url;
63. }
64.
65. public void setUrl(String url) {
66. this.url = url;
67. }
68.
69. public String getStyle() {
70. return style;
71. }
72.
73. public void setStyle(String style) {
74. this.style = style;
75. }
76.
77.}2.写分页标签模板，模板放在src目录下d的“template/主题名”文件夹中。
因为我选择的struts2主题是simple，所以我把模板放在“template/simple”文件夹下面。
模板文件名是“pagebar_basic.ftl”.
Html代码1.<#-- 定义顶层变量并转换 -->
2.<#assign totalPage=parameters.totalPage?number />
3.<#assign totalRecord=parameters.totalRecord?number />
4.<#assign pageNo=parameters.pageNo?number />
5.<#assign url=parameters.url />
6.<#-- 模板逻辑 -->
7.<#if (totalRecord>0) && (totalPage>1) && (pageNo>0) && (pageNo<=totalPage)>
8. <#--计算开始位置和结束位置-->
9. <#if (pageNo<=5)>
10. <#assign leftNo=1 />
11. <#if (totalPage<10)>
12. <#assign rightNo=totalPage />
13. <#else>
14. <#assign rightNo=10 />
15. </#if>
16. <#elseif (pageNo>5) && (pageNo<=totalPage-5)>
17. <#if (pageNo-4>0)>
18. <#assign leftNo=pageNo-4 />
19. <#else>
20. <#assign leftNo=1 />
21. </#if>
22. <#if (pageNo+5<=totalPage)>
23. <#assign rightNo=pageNo+5 />
24. <#else>
25. <#assign rightNo=totalPage />
26. </#if>
27. <#else>
28. <#if (totalPage-10+1>0)>
29. <#assign leftNo=totalPage-10+1 />
30. <#else>
31. <#assign leftNo=1 />
32. </#if>
33. <#assign rightNo=totalPage />
34. </#if>
35. <#--输出内容-->
36. <div class="pagebar_warpper">
37. <ul class="pagebar_ul">
38. <li>共有<span class="pagebar_rc">${totalRecord?c}</span>条数据</li>
39. <li class="pagebar_li">
40. <a href="<@getURL text=url page=1 />">首页</a>
41. <#if (pageNo-1>=1)>
42. <a href="<@getURL text=url page=pageNo-1 />">上一页</a>
43. </#if>
44. <#list leftNo..rightNo as p>
45. <#if (p==pageNo)>
46. <span class="pagebar_curr">${p}</span>
47. <#else>
48. <a href="<@getURL text=url page=p />">${p}</a>
49. </#if>
50. </#list>
51. <#if (pageNo+1<=totalPage)>
52. <a href="<@getURL text=url page=pageNo+1 />">下一页</a>
53. </#if>
54. <a href="<@getURL text=url page=totalPage />">尾页</a>
55. </li>
56. </ul>
57. </div>
58.</#if>
59.
60.<#--产生动态URL的宏-->
61.<#macro getURL text page>
62. <#if (text?index_of("?")>0)>
63. <#lt/>${text?replace("?","?pageNo="+page)}<#rt/>
64. <#else>
65. <#lt/>${text}?pageNo=${page}<#rt/>
66. </#if>
67.</#macro>3.在WEB-INFO目录下新建一个tld文件，名字叫lowca-struts.tld,tld文件内容如下
Xml代码1.<?xml version="1.0" encoding="UTF-8"?>
2.<!DOCTYPE taglib PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN" "http://java.sun.com/dtd/web-jsptaglibrary_1_2.dtd">
3.<taglib>
4. <tlib-version>1.0</tlib-version>
5. <jsp-version>1.2</jsp-version>
6. <short-name>l</short-name>
7. <uri>/lowca-tags</uri>
8. <display-name>自定义的struts标签</display-name>
9.
10. <tag>
11. <name>pagebar</name>
12. <tag-class>com.lowca.activity.expand.struts.PagebarTag</tag-class>
13. <body-content>jsp</body-content>
14. <description>分页工具条</description>
15. <attribute>
16. <name>totalRecord</name>
17. <required>true</required>
18. <rtexprvalue>true</rtexprvalue>
19. <type>int</type>
20. <description>记录数</description>
21. </attribute>
22. <attribute>
23. <name>totalPage</name>
24. <required>true</required>
25. <rtexprvalue>true</rtexprvalue>
26. <type>int</type>
27. <description>总页数</description>
28. </attribute>
29. <attribute>
30. <name>pageNo</name>
31. <required>true</required>
32. <rtexprvalue>true</rtexprvalue>
33. <type>int</type>
34. <description>页码</description>
35. </attribute>
36. <attribute>
37. <name>url</name>
38. <required>true</required>
39. <rtexprvalue>true</rtexprvalue>
40. <type>java.lang.String</type>
41. <description>url地址</description>
42. </attribute>
43. <attribute>
44. <name>style</name>
45. <required>false</required>
46. <rtexprvalue>true</rtexprvalue>
47. <type>java.lang.String</type>
48. <description>呈现样式</description>
49. </attribute>
50. </tag>
51.</taglib>4.在web.xml注册这个自定义tld
Xml代码1.<!-- 注册自定义的标签 -->
2.<jsp-config>
3. <taglib>
4. <taglib-uri>/lowca-tags</taglib-uri>
5. <taglib-location>/WEB-INF/lowca-struts.tld</taglib-location>
6. </taglib>
7.</jsp-config>5.在页面上面使用这个自定义标签
Html代码1.<%@ page language="java" pageEncoding="UTF-8"%>
2.<%@ taglib prefix="l" uri="/lowca-tags"%>
3.
4.<s:debug></s:debug>
5.<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
6.<html>
7.<head>
8. <title>测试</title>
9.</head>
10.
11.<body>
12. <l:pagebar pageNo="%{#parameters.pageNo}" url="test.jsp" totalPage="684" totalRecord="20498" style="basic" />
13.</body>
14.</html>至此，大功告成。
style是可以省略的属性，如果省略，则style默认值为basic。
给标签属性设置值的办法是%{ognl表达式}，例如：%{#parameters.pageNo}。
pageNo当前页码，totalPage总页数，totalRecord总记录数，这些属性都必须设置成动态查询出来的，比如：%{totalPage}，%{totalRecord}，%{#parameters.pageNo}
你可以定义你自己的模板来扩展这个标签，模板命名规则为pagebar_${style名称}.ftl，例如：pagebar_advance.ftl。 学习鸟 谢谢分享
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