强大的分页实体类以及页面代码(注释详细)

/** * 分页实体类 * @version [版本号, Nov 9, 2011] */ public class Page { private int currentPage;//当前页 private int pageSize; //分页大小 private int totalNum; //总条数 private int totalPage; //总页数 private String url; //url地址 //private Object obj; private String firstPageUrl;//首页 private String nextPageUrl; //下一页 private String prePageUrl; //上一页 private String lastPageUrl; //尾页 public Page(int currentPage, int pageSize, int totalNum, String url) { super(); this.pageSize = pageSize; this.totalNum = totalNum; this.url = url; totalPage = totalNum/pageSize; //如果总条数能不被每页条数整除，总页数加1 if (0!=totalNum%pageSize){ totalPage ++; } if (currentPage>totalPage) {//当前页大于总页数时，把总页数的值赋给当前页 this.currentPage = totalPage; }else if (currentPage<1) {//当前页大于小于0时，当前页为赋值为1 this.currentPage = 1; }else { this.currentPage = currentPage; } } public int getCurrentPage() { return currentPage; } public void setCurrentPage(int currentPage) { this.currentPage = currentPage; } public int getPageSize() { return pageSize; } public void setPageSize(int pageSize) { this.pageSize = pageSize; } public int getTotalNum() { return totalNum; } public void setTotalNum(int totalNum) { this.totalNum = totalNum; } public int getTotalPage() { return totalPage; } public void setTotalPage(int totalPage) { this.totalPage = totalPage; } public String getUrl() { return url; } public void setUrl(String url) { this.url = url; } /** * 设置首页地址 * create on Nov 10, 2011 */ public void setFirstPageUrl(){ StringBuffer firstUrl = new StringBuffer(url); firstUrl.append("currentPage=1&pageSize=").append(pageSize); this.firstPageUrl = firstUrl.toString(); } /** * 得到首页地址 * create on Nov 9, 2011 */ public String getFirstPageUrl(){ setFirstPageUrl(); return this.firstPageUrl; } /** * 设置尾页地址 * create on Nov 10, 2011 */ public void setLastPageUrl(){ StringBuffer lastUrl = new StringBuffer(url); lastUrl.append("currentPage=") .append(totalPage) .append("&pageSize=") .append(pageSize); this.lastPageUrl = lastUrl.toString(); } /** * 得到尾页地址 * create on Nov 9, 2011 */ public String getLastPageUrl(){ setLastPageUrl(); return this.lastPageUrl; } /** * 设置下一页地址 * create on Nov 10, 2011 */ public void setNextPageUrl(){ StringBuffer nextUrl = new StringBuffer(url); nextUrl.append("currentPage=") .append(currentPage+1) .append("&pageSize=") .append(pageSize); this.nextPageUrl = nextUrl.toString(); } /** * 得到下一页地址 * create on Nov 9, 2011 */ public String getNextPageUrl(){ setNextPageUrl(); return this.nextPageUrl; } /** * 设置上一页地址 * create on Nov 10, 2011 */ public void setPrePageUrl(){ StringBuffer preUrl = new StringBuffer(url); preUrl.append("currentPage=") .append(currentPage-1) .append("&pageSize=") .append(pageSize); this.prePageUrl = preUrl.toString(); } /** * 得到上一页地址 * create on Nov 9, 2011 */ public String getPrePageUrl(){ setPrePageUrl(); return this.prePageUrl; } }