pagination.java

学生成绩管理系统JPA做的

package com.fengmanfei.student.util;

public class Pagination {

	/**
	 * 生成分页信息 包括第一页，上一页，下一页，最后一页等等。
	 * 
	 * @param pageNum 当前页数
	 * @param pageCount 总页数
	 * @param recordCount 总记录数
	 * @param pageUrl 页面 URL
	 * @return
	 */
	public static String getPagination(int pageNum, int pageCount, int recordCount, String pageUrl){

		String url = pageUrl.contains("?") ? pageUrl : pageUrl + "?";

		StringBuffer buffer = new StringBuffer();
		buffer.append("第 " + pageNum + "/" + pageCount + " 页 共 " + recordCount + " 记录 ");

		buffer.append(pageNum == 1 ? " 第一页 " : " <a href='" + url	+ "&pageNum=1'>第一页</a> ");
		buffer.append(pageNum == 1 ? " 上一页 " : " <a href='" + url + "&pageNum=" + (pageNum - 1) + "'>上一页</a> ");
		buffer.append(pageNum == pageCount ? " 下一页 " : " <a href='" + url	+ "&pageNum=" + (pageNum + 1) + "'>下一页</a> ");
		buffer.append(pageNum == pageCount ? " 最后一页 " : " <a href='" + url + "&pageNum=" + pageCount + "'>最后一页</a> ");

		buffer.append(" 到 <input type='text' name='helloweenvsfei_goto_input' style='width:25px; font-size:12px; text-align:center; '> 页 ");
		buffer.append(" <input type='button' name='helloweenvsfei_goto_button' value='Go' style='font-size:12px; '>");

		buffer.append("<script language='javascript'>");
		buffer.append("function helloweenvsfei_enter(){");
		buffer.append("	if(event.keyCode == 13){");
		buffer.append("		helloweenvsfei_goto();");
		buffer.append("		return false;");
		buffer.append("	}");
		buffer.append("	return true;");
		buffer.append("} ");
		buffer.append("function helloweenvsfei_goto(){");
		buffer.append("	var numText = document.getElementsByName('helloweenvsfei_goto_input')[0].value;");
		buffer.append("	var num = parseInt(numText, 10);");
		buffer.append("	if(!num){");
		buffer.append("		alert('页数必须为数字');	");
		buffer.append("		return;");
		buffer.append("	}");
		buffer.append("	if(num<1 || num>" + pageCount + "){");
		buffer.append("		alert('页数必须大于 1，且小于总页数 " + pageCount + " ');	");
		buffer.append("		return;");
		buffer.append("	}");
		buffer.append("	location='" + url + "&pageNum=' + num;");
		buffer.append("}");
		buffer.append("document.getElementsByName('helloweenvsfei_goto_input')[0].onkeypress = helloweenvsfei_enter;");
		buffer.append("document.getElementsByName('helloweenvsfei_goto_button')[0].onclick = helloweenvsfei_goto;");
		buffer.append("</script>");

		return buffer.toString();
	}

}