pager.java

本公司开发项目中本人做的公共类文件。如文件的操作

// Decompiled by Jad v1.5.7d. Copyright 2000 Pavel Kouznetsov.
// Jad home page: http://www.geocities.com/SiliconValley/Bridge/8617/jad.html
// Decompiler options: packimports(3)
// Source File Name:   Pager.java

package com.intohotel.util;

import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.ResourceBundle;

import javax.servlet.http.HttpServletRequest;

import org.apache.struts2.ServletActionContext;


public class Pager
{

    public Pager()
    {
    }

    /**
     * 生成分页脚本
     * @param offset	第几行起
     * @param length	总记数
     * @param size		每页行数
     * @param url
     * @param pageContext
     * @return
     */
    public static String generate(int offset, int length, int size, String url, String pageContext)
    {
        return generate(offset, length, size, url, null,pageContext);
    }

    /**
     * 生成分页脚本
     * @param offset	第几行起
     * @param length	总记数
     * @param size		每页行数
     * @param url
     * @param param
     * @param pageContext
     * @return
     */
    @SuppressWarnings("unchecked")
	public static String generate(int offset, int length, int size )
    {    
     	HttpServletRequest request = ServletActionContext.getRequest();
    	String url = request.getRequestURL().toString();
    	String pageContext = request.getContextPath();
    	List<String>list = new ArrayList<String>();
    	list.add("fenye");
    	list.add("pagelength");
    	list.add("length");
    	list.add("offset");
    	
    	StringBuffer sb = new StringBuffer(200); 
    	Enumeration<String> e = request.getParameterNames();
    	while (e.hasMoreElements()) {
    		String s = e.nextElement();
    		if(!list.contains(s)){
			String [] ss = request.getParameterValues(s);
			for (int i = 0; i < ss.length; i++) 
			{
				sb.append("&").append(s).append("=").append(ss[i]);
			}
    		}
		}
    	
       sb.append("&fenye=1");
        if(length > size)
        {
            String pref;
            if(url.indexOf("?") > -1)
                pref = "&";
            else
                pref = "?";
            String header = "";
            int pagecount = 0;
            if(length % size == 0)
                pagecount = length / size;
            else
                pagecount = length / size + 1;
            header = header + "\u5171 " + length + " \u884C\uFF0C" + pagecount + " \u9875  ";
            String disParm = '"'+ url + pref + "offset=**" + "&length=" + size + "&pagelength=" + size + sb.toString() + '"';
            if(offset > 0)
                header = header + "&nbsp;<a href='javascript:goPage(1)'>" + new MessageFormat(prop.getString("pager.header.prev")).format(new String[]{pageContext}) + "</a>\n";
            int radius = (MAX_PAGE_INDEX / 2) * size;
            int start;
            if(offset < radius)
                start = 0;
            else
            if(offset < length - radius)
                start = offset - radius;
            else
            if(length / size - MAX_PAGE_INDEX < 0)
                start = 0;
            else
            if(length % size == 0)
                start = (length / size - MAX_PAGE_INDEX) * size;
            else
                start = ((length / size + 1) - MAX_PAGE_INDEX) * size;
            for(int i = start; i < length && i < start + MAX_PAGE_INDEX * size; i += size)
                if(i == offset)
                    header = header + "<b>" + (i / size + 1) + "</b>\n";
                else
                    header = header + "&nbsp;<a href='javascript:goPage(" + (i / size + 1) + ")'>" + (i / size + 1) + "</a>\n";
            if(offset < length - size)
                header = header + "&nbsp;<a href='javascript:goPage(" + pagecount + ")'>" + new MessageFormat(prop.getString("pager.header.next")).format(new String[]{pageContext}) + "</a>\n";
            header = header + "</a>&nbsp;&nbsp;\u8F6C\u7B2C&nbsp;<input type=\"text\" name=\"goPage\" id=\"goPage\" size=\"3\" onkeydown=\"KeyDown(event);\">";
            header = header + "<input type=\"text\" name=\"temp\" style=\"display:none\">";
            header = header + " \u9875<a href='javascript:goPage()'>"+new MessageFormat(prop.getString("pager.header.go")).format(new String[]{pageContext})+"</a>&nbsp;\n";
            header = header + " <input type=hidden name=\"sppageparm\"  id=\"sppageparm\" value=" + disParm + ">\n";
            header = header + " <input type=hidden name=\"sppagetotal\" id=\"sppagetotal\" value=" + pagecount + ">\n";
            header = header + " <input type=hidden name=\"sppagelength\" id=\"sppagelength\" value=" + size + ">\n";
            return header;
        } else
        {
            return "";
        }
    }
    public static String generate(int offset, int length, int size, String url, String param,String pageContext)
    {      
        if(param != null && param.length() > 0)
            param = "&" + param;
        else
            param = "";
        param = param + "&fenye=1";
        if(length > size)
        {
            String pref;
            if(url.indexOf("?") > -1)
                pref = "&";
            else
                pref = "?";
            String header = "";
            int pagecount = 0;
            if(length % size == 0)
                pagecount = length / size;
            else
                pagecount = length / size + 1;
            header = header + "\u5171 " + length + " \u884C\uFF0C" + pagecount + " \u9875  ";
            String disParm = '"'+ url + pref + "offset=**" + "&length=" + size + "&pagelength=" + size + param + '"';
            if(offset > 0)
                header = header + "&nbsp;<a href='javascript:goPage(1)'>" + new MessageFormat(prop.getString("pager.header.prev")).format(new String[]{pageContext}) + "</a>\n";
            int radius = (MAX_PAGE_INDEX / 2) * size;
            int start;
            if(offset < radius)
                start = 0;
            else
            if(offset < length - radius)
                start = offset - radius;
            else
            if(length / size - MAX_PAGE_INDEX < 0)
                start = 0;
            else
            if(length % size == 0)
                start = (length / size - MAX_PAGE_INDEX) * size;
            else
                start = ((length / size + 1) - MAX_PAGE_INDEX) * size;
            for(int i = start; i < length && i < start + MAX_PAGE_INDEX * size; i += size)
                if(i == offset)
                    header = header + "<b>" + (i / size + 1) + "</b>\n";
                else
                    header = header + "&nbsp;<a href='javascript:goPage(" + (i / size + 1) + ")'>" + (i / size + 1) + "</a>\n";
            if(offset < length - size)
                header = header + "&nbsp;<a href='javascript:goPage(" + pagecount + ")'>" + new MessageFormat(prop.getString("pager.header.next")).format(new String[]{pageContext}) + "</a>\n";
            header = header + "</a>&nbsp;&nbsp;\u8F6C\u7B2C&nbsp;<input type=\"text\" id=\"goPage\" name=\"goPage\" size=\"3\" onkeydown=\"KeyDown(event);\">";
            header = header + "<input type=\"text\" name=\"temp\" style=\"display:none\">";
            header = header + " \u9875<a href='javascript:goPage()'><img src=\""+pageContext+"/images/go.gif\" width=\"15\" height=\"15\" border=\"0\" align=\"center\"></a>&nbsp;\n";
            header = header + " <input type=hidden name=sppageparm id=\"sppageparm\" value=" + disParm + ">\n";
            header = header + " <input type=hidden name=sppagetotal id=\"sppagetotal\" value=" + pagecount + ">\n";
            header = header + " <input type=hidden name=sppagelength id=\"sppagelength\" value=" + size + ">\n";
            return header;
        } else
        {
            return "";
        }
    }
    /**
     * jasperReopert专用报表分页脚本
     * @param current	当前页
     * @param end		最后一页
     * @param url
     * @param param
     * @param pageContext
     * @return
     */
    public static String generateReport(int current, int end, String url, String param,String pageContext){
        
        if(param != null && param.length() > 0)
            param = "&" + param;
        else
            param = "";
        param = param + "&fenye=1";
        if(end > current)
        {
            String pref;
            if(url.indexOf("?") > -1)
                pref = "&";
            else
                pref = "?";
            String header = "";
            header = header + "第 "+(current+1)+" 页 / 共 " + end + " 页 \u9875  ";
            String disParm = '"'+ url + pref + "offset=**"+ param + '"';
            if(current > 0)
                header = header + "&nbsp;<a href='javascript:goReportPage(0)'>" + new MessageFormat(prop.getString("pager.header.prev")).format(new String[]{pageContext}) + "</a>\n";
            int start=0;
            if(current<=0)
            	start= 0;
            else
            	start = current-1;
            start= start-2;
            if(start<0)
            	start=0;
            for(int i = start; i < end && i<= (current+2);i++){
                if(i == current)
                    header = header + "<b>" + (i+1) + "</b>\n";
                else
                    header = header + "&nbsp;<a href='javascript:goReportPage(" + i + ")'>" +(i+1) + "</a>\n";
            }
            if(end-1 > current)
                header = header + "&nbsp;<a href='javascript:goReportPage(" + (end-1) + ")'>" + new MessageFormat(prop.getString("pager.header.next")).format(new String[]{pageContext}) + "</a>\n";
            header = header + "</a>";
            header = header + " <input type=\"hidden\" name=\"goPage\" id=\"goPage\"><input type=hidden name=\"sppageparm\"  id=\"sppageparm\" value=" + disParm + ">\n";
            header = header + " <input type=hidden name=\"sppagetotal\" id=\"sppagetotal\" value=" + (end-1) + ">\n";
            header = header + " <input type=hidden name=\"sppagelength\" id=\"sppagelength\" value=1>\n";
            return header;
        } else
        {
            return "";
        }
    }
    public static String generateOrder(int offset, int length, int size, String url, String condition, String order)
    {
        //condition = CommFunc.parseCondition(condition);
        order = order + "&fenye=1";
        if(length > size)
        {
            String pref;
            if(url.indexOf("?") > -1)
                pref = "&";
            else
                pref = "?";
            String header = "";
            int pagecount = 0;
            if(length % size == 0)
                pagecount = length / size;
            else
                pagecount = length / size + 1;
            header = header + "\u5171 " + length + " \u884C\uFF0C" + pagecount + " \u9875  ";
            if(offset > 0)
                header = header + "&nbsp;<a href='javascript:goPage(1)'>" + prop.getString("pager.header.prev") + "</a>\n";
            int radius = (MAX_PAGE_INDEX / 2) * size;
            String disParm = '"' + url + pref + "pager.offset=**" + "&length=" + size + "&length=" + size + "&condition=" + condition + "&order=" + order + '"';
            int start;
            if(offset < radius)
                start = 0;
            else
            if(offset < length - radius)
                start = offset - radius;
            else
            if(length / size - MAX_PAGE_INDEX < 0)
                start = 0;
            else
            if(length % size == 0)
                start = (length / size - MAX_PAGE_INDEX) * size;
            else
                start = ((length / size + 1) - MAX_PAGE_INDEX) * size;
            for(int i = start; i < length && i < start + MAX_PAGE_INDEX * size; i += size)
                if(i == offset)
                    header = header + "<b>" + (i / size + 1) + "</b>\n";
                else
                    header = header + "&nbsp;<a href='javascript:goPage(" + (i / size + 1) + ")'>" + (i / size + 1) + "</a>\n";

            if(offset < length - size)
                header = header + "&nbsp;<a href='javascript:goPage(" + pagecount + ")'>" + prop.getString("pager.header.next") + "</a>\n";
            header = header + "</a>&nbsp;&nbsp;\u8F6C\u7B2C&nbsp;<input type=\"text\" name=\"goPage\" id=\"goPage\" size=\"3\" onkeydown=\"KeyDown(event);\">";
            header = header + "<input type=\"text\" name=\"temp\" style=\"display:none\">";
            header = header + " \u9875&nbsp;<a href='javascript:goPage()'><img src=\"/images/go.gif\" width=\"16\" height=\"16\" border=\"0\" align=\"middle\"></a>&nbsp;\n";
            header = header + " <input type=hidden name=\"sppageparm\"  id=\"sppageparm\" value=" + disParm + ">\n";
            header = header + " <input type=hidden name=\"sppagetotal\" id=\"sppagetotal\" value=" + pagecount + ">\n";
            header = header + " <input type=hidden name=\"sppagelength\" id=\"sppagelength\" value=" + size + ">\n";
            return header;
        } else
        {
            return "";
        }
    }

    private static ResourceBundle prop;
    private static int MAX_PAGE_INDEX = 15;
    //private static String HEADER = "Result page";

    static
    {
        prop = ResourceBundle.getBundle("struts");
        try
        {
            //HEADER = prop.getString("pager.header.title");
        }
        catch(Exception e) { }
        try
        {
            MAX_PAGE_INDEX = Integer.parseInt(prop.getString("pager.max.page.index"));
        }
        catch(Exception e) { }
    }
}