JSP自定义分页标签库

来源：互联网发布：东方园林知乎编辑：程序博客网时间：2024/05/02 04:52

目的：分页在查询页面几乎哪里都要用到，代码繁琐，本张介绍通过jsp自定义标签库实现分页技术，

使用步骤

1：导入自定义标签库 <%@ taglib prefix="cc" uri="/pagetag"%>

2：使用标签库 <cc:tagout url="integeral/queryIntegral.html"pageindex="${pageindex}" pagesize="10" totalsize="120"></cc:tagout>

这样就可以了，哪里需要分页技术及这两句话，js和jsp代码都封装好，无需再进行逻辑处理，使用时要做的及时在标签赋值就可以实现任何分页了

看效果

1：查看第6页后，上页，下页显示

2：点击上页后，没有上页了，从1页开始

3：点击下页后

4店家第8页后

实现步骤

1定义tdl文件

<?xml version="1.0" encoding="UTF-8"?>
<taglib version="2.0" xmlns="http://java.sun.com/xml/ns/j2ee"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee web-jsptaglibrary_2_0.xsd">
   <tlib-version>1.0</tlib-version>
   <jsp-version>2.0</jsp-version>
   <short-name>cc</short-name>
   <uri>/pagetag</uri>
   <tag>
       <name>tagout</name>
       <tag-class>com.datong.rootravel.constants.PageTag</tag-class>
       <body-content>empty</body-content>
       <attribute>
           <name>url</name>
           <required>true</required>
           <rtexprvalue>true</rtexprvalue>
       </attribute>
       <attribute>
           <name>pageindex</name>
           <required>true</required>
           <rtexprvalue>true</rtexprvalue>
       </attribute>
       <attribute>
           <name>pagesize</name>
           <required>true</required>
           <rtexprvalue>true</rtexprvalue>
       </attribute>
       <attribute>
           <name>totalsize</name>
           <required>true</required>
           <rtexprvalue>true</rtexprvalue>
       </attribute>
   </tag>
</taglib>

2：写分页实现类继承tagSupport类

package com.datong.rootravel.constants;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.TagSupport;

/*
* JSP 分页标签通用库
*
* auto zg
* time 2014-10-13
*
* */

public class PageTag extends TagSupport {

   private String url;
   private int pageindex;
   private int pagesize;
   private int totalsize;

   // 在开始标签属性设置后调用，如果返回SKIP_BODY则忽略标签之中的内容，如果返回EVAL_BODY_INCLUDE则将标签体的内容进行输出
   @Override
   public int doStartTag() throws JspException {
       JspWriter out = null;
       Integer temp = 0;
       String style="style=\"color:red;\"";
       for (int t = pageindex; t > 0; t++) {
           if (t % 5 == 0) {
               temp = t;
               break;
           }
       }

       try {
           out = this.pageContext.getOut();
           if (url == null) {
               out.println("error: url is null!");
               return SKIP_BODY;
           }
           Integer pagecount = (Integer) (totalsize % pagesize == 0 ? totalsize
                   / pagesize
                   : totalsize / pagesize + 1);
           out.print("<div id=\"member_new_pages\">");
           out.print("<ul>");

           if (pagecount <= 5) { // 总页小于5 没有上页下页
               for (int i = 1; i <= pagecount; i++) {
                   out.print("<li ><a "+(i==pageindex?style:"")+" href=\"javascript:pageQuery('" + url + "?pageindex="
                           + i + "&pagesize=" + pagesize
                           + "&totalsize=" + totalsize + "')\">" + i
                           + "</a></li>");
               }
           } else {
               // 上页
               if (temp > 5) {
                   out.print("<li ><a href=\"javascript:pageQuery('" + url + "?pageindex="
                           + (temp - 9) + "&pagesize=" + pagesize
                           + "&totalsize=" + totalsize + "')\">上一页</a></li>");
               }

               if (temp> pagecount) { // 没有下一页了
                   for (int i = temp - 4; i <= pagecount; i++) {
                       out.print("<li ><a "+(i==pageindex?style:"")+" href=\"javascript:pageQuery('" + url + "?pageindex="
                               + i + "&pagesize=" + pagesize
                               + "&totalsize=" + totalsize + "')\">" + i
                               + "</a></li>");
                   }

               } else {
                   for (int i = temp - 4; i <= temp; i++) {
                       out.print("<li ><a "+(i==pageindex?style:"")+" href=\"javascript:pageQuery('" + url + "?pageindex="
                               + i + "&pagesize=" + pagesize
                               + "&totalsize=" + totalsize + "')\">" + i
                               + "</a></li>");
                       if (i == temp) {
                           out.print("<li><a href=\"javascript:pageQuery('" + url + "?pageindex="
                                   + (temp + 1) + "&pagesize=" + pagesize
                                   + "&totalsize=" + totalsize
                                   + "')\">下一页</a></li>");

                       }
                   }
               }
           }

           out.print("</ul></div>");

       } catch (Exception e) {
           e.printStackTrace();
       }

       return SKIP_BODY;

   }

   public int getTotalsize() {
       return totalsize;
   }

   public void setTotalsize(int totalsize) {
       this.totalsize = totalsize;
   }

   // 在结束标签之前调用，返回SKIP_PAGE跳过整个jsp页面后面的输出，返回EVAL_PAGE执行页面余下部分
   @Override
   public int doEndTag() throws JspException {
       return EVAL_PAGE;
   }

   // 生命周期结束时调用
   @Override
   public void release() {
       super.release();

   }

   public String getUrl() {
       return url;
   }

   public void setUrl(String url) {
       this.url = url;
   }

   public int getPageindex() {
       return pageindex;
   }

   public void setPageindex(int pageindex) {
       this.pageindex = pageindex;
   }

   public int getPagesize() {
       return pagesize;
   }

   public void setPagesize(int pagesize) {
       this.pagesize = pagesize;
   }

}

3：配置web.xml

<jsp-config>
    <taglib>
      <taglib-uri>/pagetag</taglib-uri>
      <taglib-location>/WEB-INF/pagetag.tld</taglib-location>
    </taglib>
</jsp-config>

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