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  • java超强分页标签演示

    最近在做一个项目，用到了一个分页，于是动手写了个分页标签，先将代码贴出来，供大家交流，写的不好，请见谅！、

    以下是java标签类，继承自SimpleTagSupport

    [java] view plaincopyprint?
    1. package com.lynn.oa.tag;  
    2.   
    3. import java.io.IOException;  
    4. import java.util.ArrayList;  
    5. import java.util.List;  
    6.   
    7. import javax.servlet.jsp.JspException;  
    8. import javax.servlet.jsp.JspWriter;  
    9. import javax.servlet.jsp.tagext.SimpleTagSupport;  
    10.   
    11. import com.lynn.oa.util.Page;  
    12.   
    13. public class PageTag extends SimpleTagSupport {  
    14.       
    15.     private Integer pageIndex;//当前页数  
    16.     private Integer pageCount;//总页数  
    17.     private String path;//页面链接  
    18.     private String param;//传入的参数  
    19.     //private List<Page> pageList;//显示的页号，一次显示10页，当前页位于中间第5的位置  
    20.       
    21.     @Override  
    22.     public void doTag() throws JspException, IOException {  
    23.           
    24.         JspWriter out = this.getJspContext().getOut();//指定输入流，用于页面输出分页信息、  
    25.         StringBuffer sb = new StringBuffer();//构建StringBuffer对象，用户拼接分页标签  
    26.         sb.append(this.getPageIndex());  
    27.         sb.append("/");  
    28.         sb.append(this.getPageCount());  
    29.         //显示当前页和总页数  
    30.           
    31.         //如果当前页在第一页，则首页和上一页没有超链接  
    32.         if(this.pageIndex==1){  
    33.             sb.append("首页 上一页 ");  
    34.         }else{  
    35.             sb.append("<a href='");  
    36.             sb.append(this.path);  
    37.             sb.append("?");  
    38.             sb.append(this.param);  
    39.             sb.append("=");  
    40.             sb.append(1);  
    41.             sb.append("'>首页</a> ");  
    42.             sb.append("<a href='");  
    43.             sb.append(this.path);  
    44.             sb.append("?");  
    45.             sb.append(this.param);  
    46.             sb.append("=");  
    47.             sb.append(this.pageIndex-1);  
    48.             sb.append("'>上一页</a> ");  
    49.               
    50.         }  
    51.         //下面的代码显示页码，当前页在中间位置，  
    52.         if(this.getPageCount()<=10){  
    53.             for (int i = 1; i <= this.getPageCount(); i++) {  
    54.             //如果页数小于等于10页,则全部显示  
    55.                   
    56.                     if( i == pageIndex){//如果页码等于当前页，则该页数没有超链接  
    57.                         sb.append("[");  
    58.                         sb.append(i);  
    59.                         sb.append("] ");  
    60.                     }else{//否则给出超链接  
    61.                         sb.append("<a href='");  
    62.                         sb.append(this.path);  
    63.                         sb.append("?");  
    64.                         sb.append(this.param);  
    65.                         sb.append("=");  
    66.                         sb.append(i);  
    67.                         sb.append("'>[");  
    68.                         sb.append(i);  
    69.                         sb.append("]</a> ");  
    70.                       
    71.                     }  
    72.                       
    73.                 }  
    74.         }else{//如果大于10页，则从当前页为中心只显示其中10页  
    75.                     int index=1;  
    76.             if(this.pageIndex>4){//并且如果当前页大于4页，从当前页前4页开始显示10个页数  
    77.                 for (int j = this.pageIndex-4;j<=this.getPageCount(); j++) {  
    78.                     if(j==this.pageIndex){//如果页码等于当前页，则该页数没有超链接  
    79.                         sb.append("[");  
    80.                         sb.append(j);  
    81.                         sb.append("] ");  
    82.                     }else{//否则给定超链接  
    83.                         sb.append("<a href='");  
    84.                         sb.append(this.path);  
    85.                         sb.append("?");  
    86.                         sb.append(this.param);  
    87.                         sb.append("=");  
    88.                         sb.append(j);  
    89.                         sb.append("'>[");  
    90.                         sb.append(j);  
    91.                         sb.append("]</a> ");  
    92.                     }  
    93.                     index++;  
    94.                     if(index>10)//如果循环到10次则退出循环  
    95.                         break;  
    96.                 }  
    97.                   
    98.                   
    99.             }else{  
    100.                 for (int i = 1; i <= this.getPageCount(); i++) {  
    101.                     //如果页数小于等于10页,则全部显示  
    102.                           
    103.                             if( pageIndex.equals(i)){//如果页码等于当前页，则该页数没有超链接  
    104.                                 sb.append("[");  
    105.                                 sb.append(i);  
    106.                                 sb.append("] ");  
    107.                             }else{//否则给出超链接  
    108.                                 sb.append("<a href='");  
    109.                                 sb.append(this.path);  
    110.                                 sb.append("?");  
    111.                                 sb.append(this.param);  
    112.                                 sb.append("=");  
    113.                                 sb.append(i);  
    114.                                 sb.append("'>[");  
    115.                                 sb.append(i);  
    116.                                 sb.append("]</a> ");  
    117.                               
    118.                             }  
    119.                             index++;  
    120.                             if(index>10)  
    121.                                 break;  
    122.                               
    123.                         }  
    124.             }  
    125.                   
    126.                   
    127.         }  
    [java] view plaincopyprint?
    1.     //如果当前页是最后一页，则末页和下一页没有超链接  
    2.     if(this.pageIndex.equals(this.pageCount)){  
    3.         sb.append("下一页 末页 ");  
    4.     }else{  
    5.         sb.append("<a href='");  
    6.         sb.append(this.path);  
    7.         sb.append("?");  
    8.         sb.append(this.param);  
    9.         sb.append("=");  
    10.         sb.append(this.pageIndex+1);  
    11.         sb.append("'>下一页</a>");  
    12.         sb.append(" <a href='");  
    13.         sb.append(this.path);  
    14.         sb.append("?");  
    15.         sb.append(this.param);  
    16.         sb.append("=");  
    17.         sb.append(this.pageCount);  
    18.         sb.append("'>末页</a>");  
    19.     }  
    20.       
    21.     //System.out.prIntegerln(sb.toString());  
    22.   
    23.     //一下代码拼接转到第几页的js代码  
    24.     sb.append("<script type='text/javascript'>");  
    25.     sb.append("function getPage(){");  
    26.     sb.append("var pageIndex = document.getElementById('pageText').value;");  
    27.     sb.append("window.location.href='");  
    28.     sb.append(this.getPath());  
    29.     sb.append("?");  
    30.     sb.append(this.param);  
    31.     sb.append("=");  
    32.     sb.append("'+pageIndex;}");  
    33.     sb.append("</script>");  
    34.     sb.append(" 转到第<input type='text' name='pageText' id='pageText' style='15px;' />页");  
    35.     sb.append("<input type='button' name='pageBtn' value='GO' onclick='getPage()' />");  
    36.   
    37.     sb.append("<script type='text/javascript'>");  
    38.     sb.append("$(function(){$('#pageSize').change(function(){var pageSize=$('#pageSize').val();window.location.href='");  
    39.     sb.append(this.path);  
    40.     sb.append("?");  
    41.     sb.append("pageIndex=1&index='+pageSize});});</script>");  
    42.     sb.append("每页显示<select id='pageSize'><option id='noone' value='1'>请选择</option>");  
    43.     sb.append("<option value='1'>1</option>");  
    44.     sb.append("<option value='5'>5</option>");  
    45.     sb.append("<option value='10'>10</option></select>页");  
    46.     out.print(sb);  
    47. }  
    48.   
    49. public Integer getPageIndex() {  
    50.     return pageIndex;  
    51. }  
    52.   
    53. public void setPageIndex(Integer pageIndex) {  
    54.     this.pageIndex = pageIndex;  
    55. }  
    56.   
    57. public Integer getPageCount() {  
    58.     return pageCount;  
    59. }  
    60.   
    61. public void setPageCount(Integer pageCount) {  
    62.     this.pageCount = pageCount;  
    63. }  
    64.   
    65. public String getPath() {  
    66.     return path;  
    67. }  
    68.   
    69. public void setPath(String path) {  
    70.     this.path = path;  
    71. }  
    72.   
    73. public String getParam() {  
    74.     return param;  
    75. }  
    76.   
    77. public void setParam(String param) {  
    78.     this.param = param;  
    79. }  
    80.   
    81.   
    82.   
    83. public static void main(String[] args) {  
    84.     PageTag pt = new PageTag();  
    85.     pt.setPageIndex(13);  
    86.     pt.setPageCount(13);  
    87.     //pt.setPageList(pageList)  
    88.     pt.setPath("index.jsp");  
    89.     pt.setParam("pageIndex");  
    90.       
    91.     try {  
    92.         pt.doTag();  
    93.     } catch (JspException e) {  
    94.         // TODO Auto-generated catch block  
    95.         e.printStackTrace();  
    96.     } catch (IOException e) {  
    97.         // TODO Auto-generated catch block  
    98.         e.printStackTrace();  
    99.     }  
    100. }  

    tld文件如下：

    [java] view plaincopyprint?
    1. <?xml version="1.0" encoding="UTF-8" ?>  
    2.   
    3. <taglib xmlns="http://java.sun.com/xml/ns/javaee"  
    4.     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
    5.     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-jsptaglibrary_2_1.xsd"  
    6.     version="2.1">  
    7.       
    8.   <description>JSTL 1.1 core library</description>  
    9.   <display-name>JSTL core</display-name>  
    10.   <tlib-version>1.0</tlib-version>  
    11.   <short-name>mt</short-name>  
    12.   <uri>http://www.lynn88.com/jsp/jstl/pagetag</uri>  
    13.   
    14.   <tag>  
    15.     <description>  
    16.         Catches any Throwable that occurs in its body and optionally  
    17.         exposes it.  
    18.     </description>  
    19.     <name>page</name>  
    20.     <tag-class>com.lynn.oa.tag.PageTag</tag-class>  
    21.     <body-content>empty</body-content>  
    22.     <attribute>  
    23.           
    24.         <name>pageIndex</name>  
    25.         <required>true</required>  
    26.         <rtexprvalue>true</rtexprvalue>  
    27.         <type>java.lang.Integer</type>  
    28.     </attribute>  
    29.     <attribute>  
    30.           
    31.         <name>pageCount</name>  
    32.         <required>true</required>  
    33.         <rtexprvalue>true</rtexprvalue>  
    34.         <type>java.lang.Integer</type>  
    35.     </attribute>  
    36.      <attribute>  
    37.           
    38.         <name>path</name>  
    39.         <required>true</required>  
    40.         <rtexprvalue>true</rtexprvalue>  
    41.         <type>java.lang.String</type>  
    42.     </attribute>  
    43.     <attribute>  
    44.           
    45.         <name>param</name>  
    46.         <required>true</required>  
    47.         <rtexprvalue>true</rtexprvalue>  
    48.         <type>java.lang.String</type>  
    49.     </attribute>  
    50.   </tag>  
    51.   
    52. </taglib>
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  • 原文地址：https://www.cnblogs.com/564085446java/p/3725137.html
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