pageinfo.java

这是一个用java三层框架做的ISS学员管理系统

package org.pontifex.web.mapping;

import java.util.List;
import java.util.ArrayList;

/**
 * Created by IntelliJ IDEA.
 * User: Songzou
 * Date: 2007-4-8
 * Time: 11:03:06
 *
 * 分页mapping
 */
public class PageInfo extends LoginUser{

	private static final long serialVersionUID = 7873852623469564487L;

	private long totalRows = 0;//总的记录数 如:共100条记录

    private List pageList = new ArrayList(0);

    private int startIndex = 0; //当前页面第一条记录数

    private int currentPage = 1; //当前页面 如:当前第1页

    private int totalPages = 1; //总的页面数 如:共10页

    private int perPageRows = 15;//每一页显示的记录数 (可以通过set方法来进行修改)

    private String html ; //分页查询按钮
    //是不是实现分页
    private boolean showPages = true;

    public final int getCurrentPage() {
        return currentPage;
    }

    public final void setCurrentPage(int currentPage) {
        this.currentPage = currentPage;
    }

    public final int getPerPageRows() {
        return perPageRows;
    }

    public final void setPerPageRows(int perPageRows) {
        if(perPageRows>0)
            this.perPageRows = perPageRows;
    }

    public final boolean isShowPages() {
        return showPages;
    }

    public final void setShowPages(boolean showPages) {
        this.showPages = showPages;
    }

    public final int getTotalPages() {
        return totalPages;
    }

    public final void setTotalPages(int totalPages) {
        this.totalPages = totalPages;
    }

    public final long getTotalRows() {
        return totalRows;
    }

    public final void setTotalRows(long totalRows) {
        this.totalRows = totalRows;
        //计算出现在的总的页数
        this.totalPages = (int) Math.ceil((this.totalRows - 1) / this.perPageRows) + 1;
        if (this.currentPage > this.totalPages) {
            this.currentPage = 1;
        }
    }

    public final List getPageList() {
        return pageList;
    }

    public final void setPageList(List pageList) {
        this.pageList = pageList;
    }

    public final int getStartIndex() {
        this.setStartIndex((currentPage-1)*perPageRows);
        return startIndex;
    }

    private void setStartIndex(int startIndex) {
        this.startIndex = startIndex;
    }

    /**
     *
     * @return 分页查询按钮
     */
    public final String getHtml(){
        if(!showPages)return " ";
        StringBuffer string=new StringBuffer();
        string.append("<script>\n");
        string.append("function go(num){\n");
        string.append(" var pageform = window.document.getElementById('pageform');\n");
        string.append(" pageform.action=pageform.action+'&currentPage='+num;\n");
        string.append(" pageform.submit();\n");
        string.append("}\n");
        string.append("function goto(thisPage,totalPage){\n");
        string.append(" var gotoPageObject = window.document.getElementById('gotoPage');\n");
        string.append(" var gotoPage = gotoPageObject.value ;\n");
        string.append(" if(isNaN(gotoPage)){\n");
        string.append("     gotoPageObject.focus();\n") ;
        string.append("     alert('你输入的页码有误请重新输入!');\n");
        string.append("		gotoPageObject.value=1;\n");
        string.append("		return ; \n");
        string.append(" }\n");
        string.append(" if(gotoPage==thisPage){\n");
        string.append("		alert('已经是当前页!');\n");
        string.append("     return ;\n");
        string.append(" }\n");
        string.append(" if(gotoPage<1||gotoPage>totalPage){\n");
        string.append("     gotoPageObject.focus();\n") ;
        string.append("     alert('不存在该页码!');\n");
        string.append("		gotoPageObject.value=1;\n");
        string.append("		return ; \n");
        string.append(" }\n");
        string.append(" go(gotoPage);\n");
        string.append("}\n");
        string.append("</script>\n");
        //当前为第一页
        if(currentPage==1){
            string.append("<input type='button' class='btn' style='width:50px;' value='首  页' disabled/>&nbsp;");
            string.append("<input type='button' class='btn' style='width:50px;' value='上一页' disabled/>&nbsp;");
        }else{
            string.append("<input type='button' class='btn' style='width:50px;' value='首  页' onClick='go(1);' />&nbsp;");
            string.append("<input type='button' class='btn' style='width:50px;' value='上一页' onClick='go(");
            string.append(currentPage-1);
            string.append(")'/>&nbsp;");
        }
        //当前为最后一页
        if(currentPage==totalPages){
            string.append("<input type='button' class='btn' style='width:50px;' value='下一页' disabled/>&nbsp;");
            string.append("<input type='button' class='btn' style='width:50px;' value='尾  页' disabled/>&nbsp;");
        }else{
            string.append("<input type='button' class='btn' style='width:50px;' value='下一页' onClick='go(");
            string.append(currentPage+1);
            string.append(")'/>&nbsp;");
            string.append("<input type='button' class='btn' style='width:50px;' value='尾  页' onClick='go(");
            string.append(totalPages);
            string.append(")'/>&nbsp;");
        }
        string.append("&nbsp;");
        string.append("<input type='text' id='gotoPage' class='int' value='");
        string.append(currentPage);
        string.append("' style='width:30px;'/>&nbsp;&nbsp;<input type='button' class='btn' style='width:30px;' value='GO' onClick='goto(");
        string.append(currentPage);
        string.append(",");
        string.append(totalPages);
        string.append(")'/>") ;
        string.append("&nbsp;当前第");
        string.append(currentPage);
        string.append("页/共");
        string.append(totalPages);
        string.append("页&nbsp;&nbsp;每页");
        string.append(perPageRows);
        string.append("条记录&nbsp;&nbsp;总共记录数");
        string.append(totalRows);
        string.append("条&nbsp;");
        setHtml(string.toString());
        return html;
    }
    private void setHtml(String html) {
        this.html = html;
    }
}