自个儿写的真正的通用分页工具类

自己写的真正的通用分页工具类
说明：曾经在网上看过花样繁多的分页，很多都号称如何通用，但很多时候往往不尽如人意：有在分页类中还加入URL地址信息的，有在分页类中还进行分页动作处理(此动作完全属于操作数据库方面的事情)的。现在好了，经本人总结与提炼：
无论你是否自己手动分页，还是借助了框架进行分页。此工具类都可以帮助你达到稳定的分页效果(包括导航页码功能)，而且使用方法也相对简单：好了，废话少说，代码如下：

Java code

package cn.asiatelecom.wlan.dao;import java.util.List;/** * 用于分页的工具类 * @author 莫取网名 */public class Pager&lt;T&gt; {    private List&lt;T&gt; list; //对象记录结果集    private int total = 0; // 总记录数    private int limit = 20; // 每页显示记录数    private int pages = 1; // 总页数    private int pageNumber = 1; // 当前页        private boolean isFirstPage=false;        //是否为第一页    private boolean isLastPage=false;         //是否为最后一页    private boolean hasPreviousPage=false;   //是否有前一页    private boolean hasNextPage=false;       //是否有下一页        private int navigatePages=8; //导航页码数    private int[] navigatePageNumbers;  //所有导航页号        public Pager(int total, int pageNumber) {        init(total, pageNumber, limit);    }        public Pager(int total, int pageNumber, int limit) {        init(total, pageNumber, limit);    }        private void init(int total, int pageNumber, int limit){        //设置基本参数        this.total=total;        this.limit=limit;        this.pages=(this.total-1)/this.limit+1;                //根据输入可能错误的当前号码进行自动纠正        if(pageNumber&lt;1){            this.pageNumber=1;        }else if(pageNumber&gt;this.pages){            this.pageNumber=this.pages;        }else{            this.pageNumber=pageNumber;        }                //基本参数设定之后进行导航页面的计算        calcNavigatePageNumbers();                //以及页面边界的判定        judgePageBoudary();    }        /**     * 计算导航页     */    private void calcNavigatePageNumbers(){        //当总页数小于或等于导航页码数时        if(pages&lt;=navigatePages){            navigatePageNumbers=new int[pages];            for(int i=0;i&lt;pages;i++){                navigatePageNumbers[i]=i+1;            }        }else{ //当总页数大于导航页码数时            navigatePageNumbers=new int[navigatePages];            int startNum=pageNumber-navigatePages/2;            int endNum=pageNumber+navigatePages/2;                        if(startNum&lt;1){                startNum=1;                //(最前navPageCount页                for(int i=0;i&lt;navigatePages;i++){                    navigatePageNumbers[i]=startNum++;                }            }else if(endNum&gt;pages){                endNum=pages;                //最后navPageCount页                for(int i=navigatePages-1;i&gt;=0;i--){                    navigatePageNumbers[i]=endNum--;                }            }else{                //所有中间页                for(int i=0;i&lt;navigatePages;i++){                    navigatePageNumbers[i]=startNum++;                }            }        }    }    /**     * 判定页面边界     */    private void judgePageBoudary(){        isFirstPage = pageNumber == 1;        isLastPage = pageNumber == pages && pageNumber!=1;        hasPreviousPage = pageNumber!=1;        hasNextPage = pageNumber!=pages;    }            public void setList(List&lt;T&gt; list) {        this.list = list;    }    /**     * 得到当前页的内容     * @return {List}     */    public List&lt;T&gt; getList() {        return list;    }    /**     * 得到记录总数     * @return {int}     */    public int getTotal() {        return total;    }    /**     * 得到每页显示多少条记录     * @return {int}     */    public int getLimit() {        return limit;    }    /**     * 得到页面总数     * @return {int}     */    public int getPages() {        return pages;    }    /**     * 得到当前页号     * @return {int}     */    public int getPageNumber() {        return pageNumber;    }    /**     * 得到所有导航页号      * @return {int[]}     */    public int[] getNavigatePageNumbers() {        return navigatePageNumbers;    }    public boolean isFirstPage() {        return isFirstPage;    }    public boolean isLastPage() {        return isLastPage;    }    public boolean hasPreviousPage() {        return hasPreviousPage;    }    public boolean hasNextPage() {        return hasNextPage;    }    public String toString(){        String str=new String();        str= "[" +            "total="+total+            ",pages="+pages+            ",pageNumber="+pageNumber+            ",limit="+limit+            //",navigatePages="+navigatePages+            ",isFirstPage="+isFirstPage+            ",isLastPage="+isLastPage+            ",hasPreviousPage="+hasPreviousPage+            ",hasNextPage="+hasNextPage+            ",navigatePageNumbers=";        int len=navigatePageNumbers.length;        if(len&gt;0)str+=(navigatePageNumbers[0]);        for(int i=1;i&lt;len;i++){            str+=(" "+navigatePageNumbers[i]);        }        //sb+=",list="+list;        str+="]";        return str;    }}

PS: 此类在构造时最多只要３个参数。由于容错需要，list的setter得进行后继处理。
假设你使用了Hibernate,核心代码如下：

Java code

int totalCount=Integer.valueOf(queryCount.uniqueResult().toString());Pager pager=new Pager&lt;T&gt;(totalCount, pageNumber,limit);queryList.setFirstResult((pager.getPageNumber()-1)*limit); //容错处理queryList.setMaxResults(limit);pager.setList(queryList.list());return pager;

对于用其他方式分页的人，同样可以复用Pager类。

最后，欢迎大家拍砖！

[解决办法]
(⊙o⊙)…
toString()方法用new个String() 拼接那么多字符串效率差呀
[解决办法]
实用，顶起。。还有像楼上所说String的性能问题可以改进。。
[解决办法]
省事了
Pager中添加个方法

Java code

public int getFirstResultCount(){      return  (getPageNumber()-1)*limit;}
[解决办法]
探讨
(⊙o⊙)…
toString()方法用new个String() 拼接那么多字符串 效率差呀

[解决办法]
支持原创
[解决办法]
真的这么神奇？收藏一下 有时间看看
[解决办法]
你能不能把用法写下,就更方便了

你的toString没有拼html标签

我用的那个工具类直接就可以在jsp页面用pageTool了  
不过我还是觉得不好用

[解决办法]
可以实现 Iterator 接口，这样可以在页面上直接使用 c:forEach 进行迭代了。
[解决办法]
    private boolean isFirstPage=false;        //是否为第一页
   private boolean isLastPage=false;         //是否为最后一页
   private boolean hasPreviousPage=false;   //是否有前一页
   private boolean hasNextPage=false;       //是否有下一页

放这四个属性的意义是什么？
[解决办法]
/** 
  * yx_java@163.com 
  * @desc 分页通用Bean 
  */ 
 public class PaginationBean { 
 public static final String PREVIOUS =  "previous "; 
 public static final String NEXT =  "next "; 
 public static final String FIRST =  "first "; 
 public static final String LAST =  "last "; 
 private int maxinum; 
 private int perCount = 10; 
 private int pageNum; 
 private int pageCount; 
 private String operate; 
 /** 
  * 计算一共多少页并为当前多少页赋值 
  *最大记录数 
  */ 
 public void countPageCount(int maxinum) { 
 this.maxinum = maxinum; 
 // 计算一共多少页 
 pageNum = maxinum % perCount == 0 ? maxinum / perCount : maxinum 
 / perCount + 1; 
 // 为当前页数赋值 
 if (PREVIOUS.equals(operate)) { 
 pageCount--; 
 } else if (NEXT.equals(operate)) { 
 pageCount++; 
 } else if (FIRST.equals(operate)) { 
 pageCount = 1; 
 } else if (LAST.equals(operate)) { 
 pageCount = pageNum; 
 } 
 if (pageCount  &lt; 1) 
 pageCount = 1; 
 if (pageCount &gt;  this.pageNum) 
 pageCount = this.pageNum; 
 } 
  
 public String getOperate() { 
 return operate; 
 } 
  
 public void setOperate(String operate) { 
 this.operate = operate; 
 } 
  
 public int getMaxinum() { 
 return maxinum; 
 } 
  
 public int getPageCount() { 
 return pageCount; 
 } 
  
 public int getPageNum() { 
 return pageNum; 
 } 
  
 public int getPerCount() {  
 
 return perCount; 
 } 
  
 public void setMaxinum(int maxinum) { 
 this.maxinum = maxinum; 
 } 
  
 public void setPageCount(int pageCount) { 
 this.pageCount = pageCount; 
 } 
  
 public void setPageNum(int pageNum) { 
 this.pageNum = pageNum; 
 } 
  
 public void setPerCount(int perCount) { 
 this.perCount = perCount; 
 } 
 } 
 ------------------------------------------------ 
 运用自定义标签的机制写的分页类，这样无需在每个jsp页面需要重复的写分页标签： 
 package com.accp.common.taglib; 
  
 import javax.servlet.jsp.JspWriter; 
 import javax.servlet.jsp.tagext.TagSupport; 
  
 import com.accp.common.util.PageResult; 
 import com.accp.common.web.form.BaseForm; 
  
 public class PaginationTag extends TagSupport { 
 private static final long serialVersionUID = -5904339614208817088L; 
 private String form = null; 
  
 public int doEndTag() { 
 try { 
 BaseForm oForm = null; 
  
 //通过参数获得对应的form对象，并从form对象中获得PageResult对象 
 //生成分页标签的html代码，返回给页面显示 
 if (form!=null && ! " ".equals(form.trim())){ 
 oForm = (BaseForm) pageContext.getRequest().getAttribute(form); 
 if (null==oForm){ 
 oForm = (BaseForm) pageContext.getSession().getAttribute(form); 
 } 
 if (oForm!=null){ 
 PageResult pageResult = oForm.getPageResult(); 
 StringBuffer sb = new StringBuffer(); 
  
 sb.append( " &lt;div style= &#39;float:left;color:#03515d; &#39;&gt;  ") 
 .append( "共有  "+pageResult.getRecTotal()+ " 条记录，当前第  "+pageResult.getPageNo()+ "/ "+pageResult.getPageTotal()+ " 页 ") 
 .append( " &lt;/div&gt;  ") 
 .append( " &lt;div style= &#39;float:right;color:#03515d;clear:both; &#39;&gt;  ") 
 .append( " &lt;input type= &#39;hidden &#39; name=\ "pageResult.pageSize\ " value=\ " "+pageResult.getPageSize()+ "\ " size=\ "3\ " /&gt; &nbsp;\r\n ") 
 .append( " &lt;a href=\ &#39;javascript:page_first();\ &#39;&gt;  &lt;img src= &#39;images/first.gif &#39; alt= &#39; &#39; width= &#39;37 &#39; height= &#39;15 &#39; title= &#39;首页 &#39; style= &#39;border: 0px;cursor:pointer; &#39; /&gt;  &lt;/a&gt;   ") 
 .append( " &lt;a href=\ &#39;javascript:page_pre();\ &#39;&gt;  &lt;img src= &#39;images/back.gif &#39; alt= &#39; &#39; width= &#39;43 &#39; height= &#39;15 &#39; title= &#39;上一页 &#39; style= &#39;border: 0px;cursor:pointer; &#39; /&gt;  &lt;/a&gt;   ") 
 .append( " &lt;a href=\ &#39;javascript:page_next();\ &#39;&gt;  &lt;img src= &#39;images/next.gif &#39; alt= &#39; &#39; width= &#39;43 &#39; height= &#39;15 &#39; title= &#39;下一页 &#39; style= &#39;border: 0px;cursor:pointer; &#39; /&gt;  &lt;/a&gt;   ") 
 .append( " &lt;a href=\ &#39;javascript:page_last();\ &#39;&gt;  &lt;img src= &#39;images/last.gif &#39; alt= &#39; &#39; width= &#39;37 &#39; height= &#39;15 &#39; title= &#39;尾页 &#39; style= &#39;border: 0px;cursor:pointer; &#39; /&gt;  &lt;/a&gt;   ") 
 .append( "转到第  &lt;input type= &#39;text &#39; name=\ "pageResult.pageNo\ " maxlength= &#39;4 &#39;  style= &#39;height:16px; width:32px; border:1px solid #999999 &#39; value=\ " "+pageResult.getPageNo()+ "\ " size=\ "3\ "/&gt;  页 ") 
 .append( " &lt;a href=\ "javascript:page_go();\ "&gt;  &lt;img src= &#39;images/go.gif &#39; alt= &#39; &#39; width= &#39;37 &#39; height= &#39;15 &#39; title= &#39;跳转 &#39; style= &#39;border: 0px;cursor:pointer; &#39; /&gt;  &lt;/a&gt;  ") 
 .append( " &lt;/div&gt;  ") 
 .append( " &lt;input type=\ "hidden\ " name=\ "pageResult.orderBy\ "  value=\ " "+pageResult.getOrderBy()+ "\ " /&gt; \r\n ")  
 
 .append( " &lt;input type=\ "hidden\ " name=\ "pageResult.sort\ "  value=\ " "+pageResult.getSort()+ "\ " /&gt; \r\n ") 
 .append( " &lt;script&gt; \r\n ") 
 .append( "var pageTotal =  "+pageResult.getPageTotal()+ ";\r\n ") 
 .append( "var recTotal =  "+pageResult.getRecTotal()+ ";\r\n ") 
 .append( " &lt;/script&gt; \r\n "); 
 sb.append( " &lt;script&gt; \r\n "); 
 sb.append( "function page_go()\r\n ") 
 .append( "{\r\n ") 
 .append( "page_validate();\r\n ") 
 .append( "document.forms[0].submit();\r\n ") 
 .append( "}\r\n ") 
 .append( "function page_first()\r\n ") 
 .append( "{\r\n ") 
 .append( "document.forms[0].elements[\ "pageResult.pageNo\ "].value = 1;\r\n ") 
 .append( "document.forms[0].submit();\r\n ") 
 .append( "}\r\n ") 
 .append( "function page_pre()\r\n ") 
 .append( "{\r\n ") 
 .append( "var pageNo = document.forms[0].elements[\ "pageResult.pageNo\ "].value;\r\n ") 
 .append( "document.forms[0].elements[\ "pageResult.pageNo\ "].value = parseInt(pageNo) - 1;\r\n ") 
 .append( "page_validate();\r\n ") 
 .append( "document.forms[0].submit();\r\n ") 
 .append( "}\r\n ") 
 .append( "function page_next()\r\n ") 
 .append( "{\r\n ") 
 .append( "var pageNo = document.forms[0].elements[\ "pageResult.pageNo\ "].value;\r\n ") 
 .append( "document.forms[0].elements[\ "pageResult.pageNo\ "].value = parseInt(pageNo) + 1;\r\n ") 
 .append( "page_validate();\r\n ") 
 .append( "document.forms[0].submit();\r\n ") 
 .append( "}\r\n ") 
 .append( "function page_last()\r\n ") 
 .append( "{\r\n ") 
 .append( "document.forms[0].elements[\ "pageResult.pageNo\ "].value = pageTotal;\r\n ") 
 .append( "document.forms[0].submit();\r\n ") 
 .append( "}\r\n ") 
 .append( "function page_validate()\r\n ") 
 .append( "{\r\n ") 
 .append( "var pageNo = document.forms[0].elements[\ "pageResult.pageNo\ "].value;\r\n ") 
 .append( "if (pageNo &lt;1)pageNo=1;\r\n ") 
 .append( "if (pageNo&gt; pageTotal)pageNo=pageTotal;\r\n ") 
 .append( "document.forms[0].elements[\ "pageResult.pageNo\ "].value = pageNo;\r\n ") 
 .append( "var pageSize = document.forms[0].elements[\ "pageResult.pageSize\ "].value;\r\n ") 
 .append( "if (pageSize &lt;1)pageSize=1;\r\n ") 
 .append( "document.forms[0].elements[\ "pageResult.pageSize\ "].value = pageSize;\r\n ") 
 .append( "}\r\n ") 
 .append( "function order_by(field){\r\n ") 
 .append( "document.forms[0].elements[\ "pageResult.orderBy\ "].value = field;\r\n ") 
 .append( "page_first();\r\n ") 
 .append( "}\r\n "); 
 sb.append( " &lt;/script&gt; \r\n "); 
 JspWriter out = pageContext.getOut(); 
 out.println(sb.toString()); 
 } 
 } 
 } catch (Exception e) { 
 } 
 return EVAL_PAGE; 
 } 
  
 public String getForm() { 
 return form; 
 } 
  
 public void setForm(String form) { 
 this.form = form; 
 } 
 } 

------解决方案-------------------- 
 
恩 很不错 ！  收藏了 O(∩_∩)O~

自个儿写的真正的通用分页工具类

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