pager.java

Jsp/java 分页 简单 灵活 小巧 美观 让开发者不用关心分页显示问题 ,数据与显示相分离

/**
 * 
 */
package com.dotease.common;

import java.util.List;

/**
 * @author Administrator牛一Niuyi  2007-11-9
 *2007-11-9
 */
public class Pager 
{
	private int curPage;

	private int lastPage;

	private int prevPage;

	private int nextPage;

	private int resultCount;

	private int pageSize;

	private int pageCount;
	
	private String uri; //=uri+?+queryString
	
	private String pageInfo="";
	
	private List data;
	
	public Pager()
	{
		this.pageSize=10;
	}
	
	public Pager(int curPage, int pageSize,int resultCount, String uri)
	{
		this.curPage = curPage;
		this.resultCount = resultCount;
		this.pageSize = pageSize;
		this.uri = uri;
	}
	
	
	public String getFirstPageTag()
	{
		if(0==getPageCount())
	     {
			return "<FONT face=Webdings>9</FONT>"; 
	     }
		StringBuffer sb = new StringBuffer();
		sb.append("<A title=第一页 href=\""+this.getUri()+"1\">");
		sb.append("<FONT face=Webdings>9</FONT></A>");
		return sb.toString();
	}
   
	public String getCurPageTag()
	{
		if(0==getPageCount())
			return "";
		StringBuffer sb = new StringBuffer();
		sb.append(" <A title=当前页 href=\""+this.getUri()+this.getCurPage()+"\">");
		sb.append("<FONT  color=red><STRONG>");
		sb.append(this.getCurPage()+"</STRONG></FONT></A> ");
		return sb.toString();
	}
	
	public String getLastPageTag()
	{
		if(0==getPageCount())
	     {
			return "<FONT face=Webdings>:</FONT>"; 
	     }
		StringBuffer sb = new StringBuffer();
		sb.append("<A title=最后一页 href=\""+this.getUri()+this.getLastPage()+"\">");
		sb.append("<FONT face=Webdings>:</FONT></A>");
		return sb.toString();
	}
	
	public String getPrevPageTag()
	{
		if(curPage==1||0==getPageCount())
	     {
			return "<FONT face=Webdings>7</FONT>"; 
	     }
		StringBuffer sb = new StringBuffer();
		sb.append("<A title=上一页 href=\""+this.getUri()+this.getPrevPage()+"\">");
		sb.append("<FONT face=Webdings>7</FONT></A>");
		return sb.toString();
	}
	
	public String getNextPageTag()
	{
		if(curPage==getPageCount()||0==getPageCount())
		    {
		      return "<FONT face=Webdings>8</FONT>";
		    }
		StringBuffer sb = new StringBuffer();
		sb.append("<A title=下一页 href=\""+this.getUri()+this.getNextPage()+"\">");
		sb.append("<FONT face=Webdings>8</FONT></A>");
		return sb.toString();
	}
	
	//commonTag
	
	public String getcommonTag(int index)
	{
		return " <A href=\""+this.getUri()+index+"\">"+index+"</A>";
	}
	
	public String getListNumTag()
	{
		int num=0;//要显示的页码数
		int startNum = 0;//从那个数开始
		int pageCount=this.getPageCount();
		if(pageCount<10)
		{	
			num=this.getPageCount();
		}else
		{
			startNum=((curPage-1)/10)*10;
			if((startNum+10)>pageCount)
			{	
				num=pageCount-startNum;
			}else
			{
				num=10;
			}
		}
		
		StringBuffer sb = new StringBuffer() ;
		for(int i=1;i<=num;i++)
		{
			if(curPage==(startNum+i))
			{
				sb.append(this.getCurPageTag());
			}else
			{
			    sb.append(getcommonTag(startNum+i));
			}
		}		
		return sb.toString();	
	}
	
	
	public String getPageInfo()
	{
		StringBuffer sb = new StringBuffer() ;
		int pageCount=this.getPageCount();
		sb.append("共检索到");
		sb.append("<STRONG>"+resultCount+"</STRONG>记录 ");
		sb.append("当前：第<STRONG><FONT color=red>"+curPage+"</FONT>/"+pageCount+"</STRONG>页  ");
		sb.append("每页<STRONG>"+pageSize+"</STRONG>条记录 ");
		sb.append(this.getFirstPageTag());
		sb.append(this.getPrevPageTag());
		sb.append(this.getListNumTag());
		sb.append(this.getNextPageTag());
		sb.append(this.getLastPageTag());
		sb.append("转到"+this.getSelect()); 
		return sb.toString();
		
	}
	public String getSelect()
	{
		StringBuffer sb = new StringBuffer();
		sb.append("<SELECT onchange=window.location.href=\""+uri+"\"+this.value name=page_sel>");
		int pageCount=this.getPageCount();
		 for(int n=1;n<=pageCount;n++) 
		 {
	             if (n==curPage)
	                 {  
	            	 sb.append("<OPTION selected value="+n+">"+n+"</OPTION>");
	                  }else
	                  {
	                	  sb.append("<OPTION value="+n+">"+n+"</OPTION>");
	                   } 
	      }
		sb.append("</SELECT>");
		
		return sb.toString();
	}
	
	public String getSkipPage()
	{
		StringBuffer sb = new StringBuffer();
		sb.append("<script>");
		sb.append("\nfunction goPage(pageNumber) {");
		sb.append("\nwindow.location.href=\"" + getUri() + "\" + pageNumber;");
		sb.append("\n}");
		sb.append("\n</script>\n");	
		sb.append("<input name=\"page_num\" type=\"text\" onBlur=\"goPage(this.value)\" size=\"3\" maxlength=\"3\">");
		return sb.toString();
	}
	
	public int getCurPage() {
		return curPage;
	}

	public void setCurPage(int curPage) {
		this.curPage = curPage;
	}

	public int getFirstPage() {
		return 1;
	}

	

	public int getLastPage() {
		return this.getPageCount();
	}



	public int getNextPage() 
	{
		if (curPage == getPageCount())
		{
			return curPage;
		}
		return curPage + 1;
	}


	public int getPageCount() 
	{
		if(resultCount==0)
		{
			this.curPage=0;
			return 0;
		}
		pageCount=(resultCount - 1) / pageSize + 1;
		if(curPage>pageCount)
			curPage=pageCount;
		return pageCount;
	}


	public int getPageSize() {
		return pageSize;
	}

	public void setPageSize(int pageSize) {
		this.pageSize = pageSize;
	}

	public int getPrevPage() 
	{
		if (1 == curPage)
		{
			return 1;
		}
		return curPage - 1;
	}

	

	public int getResultCount() {
		return resultCount;
	}

	public void setResultCount(int resultCount) 
	{
		this.resultCount = resultCount;
	}

	public String getUri() {
		return uri;
	}

	public void setUri(String uri) 
	{
		int p=uri.lastIndexOf("curPage=");
		if(p==-1)
		{
			uri=uri+"&curPage=";
		}else
		{	
			uri=uri.substring(0,p+8);
		}
		this.uri = uri;
	}
//aa
	public List getData() {
		return data;
	}
	public void setData(List data) {
		this.data = data;
	}
}