Struts2/webwork的分页实现（tag）
在每次使用struts2/webwork中使用分页的时候都感觉特别麻烦，主要是标签写太多又复杂，于是就想能不能通过自定义标签进行分装分页呢?如，只需要在JSP界面上写<分页></分页>这样就ok了具体实现如下：
1 ：在需要分页的jsp界面 写下标签
<app:pagerequest action="buycompany" css_class_name="page"
next="next" nextName="<fmt:message key="nextPage"/>"
last="last" lastName="<fmt:message key="lastPage"/>" " currentPage="currentPage"
currentPageName="第" currentPageValue="${current}"
allPageName="总共" allSize="${allPage}" allSizeName="pageSize"
jump="第" page="页"/>
最终显示如图http://www.iteye.com/upload/picture/pic/33675/e66f65f1-3f54-3ab9-a35f-48675310f6bc-thumb.bmp?1237618169
1），<app: 是自己自定标签 就是下面加载标签的 prefix="app"
2）， pagerequest： 分页自定义功能对应tag name
3），action="buycompany" ：分页提交查看的对应分页action
2 ：在jsp中加载标签
<%@ taglib uri="/WEB-INF/app.tld" prefix="app" %>
这个一般我是写在tagsupport.jsp里面
具体如下
<%@ page language="java" errorPage="/error.jsp"
pageEncoding="UTF-8" contentType="text/html;charset=utf-8" %>
<%@ taglib uri="http://www.opensymphony.com/sitemesh/decorator" prefix="decorator"%>
<%@ taglib uri="http://www.opensymphony.com/sitemesh/page" prefix="page"%>
<%@ taglib uri="http://java.sun.com/jstl/fmt" prefix="fmt" %>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="/struts-tags" prefix="s" %>
<%@ taglib uri="/WEB-INF/app.tld" prefix="app" %>
所以在所有的jsp中include该tagsupport.jsp就可以了
3：WEB-INF/建立app.tld
内容如下：
<?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>1.0</tlib-version>
<jsp-version>1.2</jsp-version>
<short-name>app</short-name>
<tag>
<name>pagerequest</name>
<tag-class>com.。。。。。.taglib.PageRequestTag</tag-class>
<attribute>
<name>action</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>next</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>last</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>currentPageName</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>currentPage</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>currentPageValue</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>allSize</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>allSizeName</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>lastName</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>nextName</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>css_class_name</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>allPageName</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>jump</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
<attribute>
<name>page</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
</attribute>
</tag>
</taglib>
1）com.。。。。。taglib.PageRequestTag 就是我们自己写的自定义标签 其内容如下面第四部所讲
4：在自己的一个包中写入PageRequestTag.java
具体内容如下：
package com.sky.taglib;
import java.io.IOException;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.TagSupport;
/**
*分页自定义标签
* author:haiwoo
*/
public class PageRequestTag extends TagSupport {
/**
*
*/
private static final long serialVersionUID = -3210838227548318578L;
//查看看分页的action
private String action;
//下一页 主要是写在li的id值
private String next;
//上一页 主要是写在li的id值
private String last;
private String currentPage;
//当前页
private String currentPageName;
//但前页的值
private String currentPageValue;
//上一页的名称：中文 =上一页 英文=lastPage
private String lastName;
//上一页的名称：中文 =下一页 英文=nextPage
private String nextName;
private String allSize;
private String allSizeName;
//分页的样式
private String css_class_name;
private String jump;
private String page;
private String allPageName;
public void setAction(String action) {
this.action = action;
}
public void setAllSize(String allSize) {
this.allSize = allSize;
}
public void setCss_class_name(String css_class_name) {
this.css_class_name = css_class_name;
}
public void setLast(String last) {
this.last = last;
}
public void setNext(String next) {
this.next = next;
}
public void setJump(String jump) {
this.jump = jump;
}
public void setPage(String page) {
this.page = page;
}
public void setAllSizeName(String allSizeName) {
this.allSizeName = allSizeName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public void setNextName(String nextName) {
this.nextName = nextName;
}
public void setCurrentPage(String currentPage) {
this.currentPage = currentPage;
}
public void setAllPageName(String allPageName) {
this.allPageName = allPageName;
}
public void setCurrentPageName(String currentPageName) {
this.currentPageName = currentPageName;
}
public void setCurrentPageValue(String currentPageValue) {
this.currentPageValue = currentPageValue;
}
@Override
public int doStartTag() throws JspException {
StringBuffer sb = new StringBuffer();
int current=Integer.valueOf(currentPageValue);
int lastPage=0;
int nextPage=0;
int allPage=Integer.valueOf(allSize);
if(allPage<1)allPage=1;
if(current>1)lastPage=current-1;
else lastPage=1;
if(current<allPage)nextPage=current+1;
else nextPage=current;
sb.append("<input type=\"hidden\" name=\"" + next + "\" id=\"" + next + "\" value=\""+nextPage+"\">\n");
sb.append("<input type=\"hidden\" name=\"" + last + "\" id=\"" + last + "\" value=\""+lastPage+"\">\n");
sb.append("<ul class=\""+css_class_name+"\">");
// 上一页
sb.append("<li><a href=\"#\"" +
" onclick=\"javascript:document.getElementById(\'"+currentPage+"\').value=document.getElementById(\'"+last+"\').value," +
"document.getElementById(\'"+action+"\').submit()\" >"+
lastName+"</a></li>");
//当前第几页
sb.append("<li>"+currentPageName+current+page+"</li>");
// 下一页
sb.append("<li><a href=\"#\"" +
" onclick=\"javascript:document.getElementById(\'"+currentPage+"\').value=document.getElementById(\'"+next+"\').value," +
"document.getElementById(\'"+action+"\').submit()\" >"+
nextName+"</a></li>");
// 调转到第几页
sb.append("<li>"+jump+"<select name=\"" +
allSizeName + "\" id=\"" + allSizeName +
"\" " +
"onchange=\"javascript:document.getElementById(\'"+currentPage+"\').value=this.value," +
"document.getElementById(\'"+action+"\').submit()\""+
"class=\"select\">\n");
if("0".equals(allSize)||allSize==null||"".equals(allSize)){
sb.append(" <option value=\"0\"");
sb.append(">0</option>\n");
}else{
for(int i=1;i<=allPage;i++){
sb.append("<option value=\""+i+"\"");
sb.append(">"+i+"</option>\n");
}
}
sb.append("</select></li>"+page);
// 总共多少页
sb.append("<li>"+allPageName+allPage+page+"</li>");
sb.append("</ul>");
try {
pageContext.getOut().write(sb.toString());
} catch (IOException io) {
throw new JspException(io);
}
return super.doStartTag();
}
@Override
public void release() {
super.release();
}
}
5:在action中查询分页
//查询总共多少页
int size=manager.getObjectCount( );
allPage=(size+Constants.Page_MaxLength_Size)/Constants.Page_MaxLength_Size;
// 查询第几页
int start=(currentPage-1)*Constants.Page_MaxLength_Size-1;
if(start<0)start=0;
//这是查询结果
list=manager.getlist(start, Constants.Page_MaxLength_Size);
1) allPage 在action 中定义 我是在baseAction中定义的
/**
* 当前页 默认为第一页开始
*/
protected Integer currentPage=Integer.valueOf(1);
/**
* 总共多少页 默认只有一页
*/
protected Integer allPage=Integer.valueOf(1);
并有相应的setter与getter
2) Constants.Page_MaxLength_Size 一页显示多少条记录 这是静态final变量
总结：
好的一方面
根据上面的结果 只要我想要的分页的地方只要写下如下俩个地方
jsp:
<app:pagerequest action="buycompany" css_class_name="page"
next="next" nextName="<fmt:message key="nextPage"/>"
last="last" lastName="<fmt:message key="lastPage"/>" " currentPage="currentPage"
currentPageName="第" currentPageValue="${current}"
allPageName="总共" allSize="${allPage}" allSizeName="pageSize"
jump="第" page="页"/>
action：
//查询总共多少页
int size=manager.getObjectCount( );
allPage=(size+Constants.Page_MaxLength_Size)/Constants.Page_MaxLength_Size;
// 查询第几页
int start=(currentPage-1)*Constants.Page_MaxLength_Size-1;
if(start<0)start=0;
//这是查询结果
list=manager.getlist(start, Constants.Page_MaxLength_Size);
不好的地方
1：Constants.Page_MaxLength_Size 一页显示多少条记录 修改不方便 ：可以改进为从界面传递下去
2：没有跟ajax进行结合 每次查看分页都刷新了整个界面： 改进成ajax方式提交
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