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package com.luckystone.util; import java.util.List; public class PageHelper { // 总共的数据量 private int total; // 每页显示多少条 private int pageSize; // 共有多少页 private int totalPage; // 当前是第几页 private int index; // 数据 private List<?> data; // 连接路径 private String path = ""; /** * 页码HTML信息 */ @SuppressWarnings("unused") private String pageHTML; private int startPage; // 开始页面 private int endPage; // 结束页面 private int displayNum = 5; // 显示的页数 /** * @return the startPage */ public int getStartPage() { return startPage; } /** * @return the endPage */ public int getEndPage() { return endPage; } /** * @return the path */ public String getPath() { return path; } public void setPageSize(int pageSize) { this.pageSize = pageSize; } public void setIndex(int index) { this.index = index; } /** * 设置路径前缀，页面第一页index为1 * * @param path * 此path含有参数形式，如/aa/article?page=,或者/bb/article/list/ */ public void setPath(String path) { this.path = path; } public int getPageSize() { return pageSize; } public int getTotalPage() { return (this.total + this.pageSize - 1) / this.pageSize; } public int getIndex() { return index; } public List<?> getData() { return data; } public void setData(List<?> data) { this.data = data; } /** * @return the total */ public int getTotal() { return total; } /** * @param total * the total to set */ public void setTotal(int total) { this.total = total; } public String getPageHTML() { totalPage = getTotalPage(); StringBuffer displayInfo = new StringBuffer(); if (totalPage != 0 && pageSize != 0) { displayInfo.append("<div class='pager'>"); displayInfo.append("<span class='item nolink'>共<span class='num'>" + totalPage + "</span>页/<span class='num'>" + total + "</span>条记录</span>"); //displayInfo.append("<span class='item nolink'>/<span class='num'>" + total + "</span>条记录</span>"); // 判断如果当前是第一页 则“首页”和“第一页”失去链接 if (index <= 1) { displayInfo.append("<span class='item nolink'>首页</span>"); displayInfo.append("<span class='item nolink'>上一页</span>"); } else { displayInfo.append("<span class='item'><a href='" + path + "1'>首页</a> </span>"); displayInfo.append("<span class='item'><a href='" + path + (index - 1) + "'> 上一页</a></span>"); } countPages(); displayInfo.append("<span class='item nums'>"); for (int i = startPage; i <= endPage; i++) { if (i == index) { displayInfo.append("<span class='nolink'>" + i + "</span>"); } else { displayInfo.append("<a href='" + path + i + "'>" + i + "</a>"); } } displayInfo.append("</span>"); if (index >= totalPage) { displayInfo.append("<span class='item nolink'>下一页</span>"); displayInfo.append("<span class='item nolink'>尾页</span>"); } else { displayInfo.append("<span class='item'><a href='" + path + (index + 1) + "'> 下一页</a></span>"); displayInfo.append("<span class='item'><a href='" + path + totalPage + "'> 尾页</a></span>"); } displayInfo.append("</div>"); } return displayInfo.toString(); } /** * 计算起始页和结束页 */ public void countPages() { if (index - displayNum / 2 < 1) { startPage = 1; endPage = displayNum > totalPage ? totalPage : displayNum; } else if (index + displayNum / 2 > totalPage) { int n = totalPage - displayNum + 1; startPage = n > 0 ? n : 1; endPage = totalPage; } else { startPage = index - displayNum / 2; endPage = startPage + displayNum - 1; } } /** * @param pageHTML the pageHTML to set */ public void setPageHTML(String pageHTML) { this.pageHTML = pageHTML; } public static void main(String[] args) { PageHelper p = new PageHelper(); // p.totalPage = p.getTotalPage(); p.setTotal(1002); p.setPageSize(20); p.setPath("/bb/article/list/"); // for (int i = -80; i < 80; i++) // { // p.setIndex(i); // p.countPages(); // System.out.println(i+"----"+p.getStartPage() + "-----" + // p.getEndPage()); // } p.setIndex(33); System.out.println(p.getPageHTML()); } }
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