分页类 PageModel的手法

/**

 * 封装分页逻辑

 * @author Administrator

 *

 */

public class PageModel<T> {

//结果集

private List<T> list;

//记录数

private int totalRecords;

//每页多少条数据

private int pageSize;

//第几页

private int pageNo;

 

/**

* 返回总页数

* @return

*/

public int getTotalPages() {

return (totalRecords + pageSize - 1) / pageSize;

}

/**

* 首页

* @return

*/

public int getTopPageNo() {

return 1;

}

/**

* 上一页 

* @return

*/

public int getPreviousPageNo() {

if (this.pageNo <= 1) {

return 1;

}

return this.pageNo - 1;

}

/**

* 下一页

* @return

*/

public int getNextPageNo() {

if (this.pageNo >= getButtomPageNo()) {

return getButtomPageNo();

}

return this.pageNo + 1;

}

/**

* 尾页

* @return

*/

public int getButtomPageNo() {

return getTotalPages();

}

public List<T> getList() {

return list;

}

 

public void setList(List<T> list) {

this.list = list;

}

 

public int getTotalRecords() {

return totalRecords;

}

 

public void setTotalRecords(int totalRecords) {

this.totalRecords = totalRecords;

}

 

public int getPageSize() {

return pageSize;

}

 

public void setPageSize(int pageSize) {

this.pageSize = pageSize;

}

 

public int getPageNo() {

return pageNo;

}

 

public void setPageNo(int pageNo) {

this.pageNo = pageNo;

}

}

 

另一种写法：

 

public class PageUtils {

 

/**

* 默认第一页页码

*/

public static final int INDEX_PAGE_NUM = 1;

 

public final static int PAGE_SIZE = 15; // 默认分页大小

 

/**

* 计算页数

*/

public static int pageCount(int recordCount, int perPage) {

int pc = (int) Math.ceil(recordCount / (double) perPage);

if (pc == 0)

pc = 1;

return pc;

}

 

/**

* 计算查询时,数据当前位置(fromIndex)

*/

public static int fromIdx(int page, int fetchCount) {

return (page - INDEX_PAGE_NUM) * fetchCount;

}

 

/**

* 分页条

* 

* @param currentPage

*            当前页数

* @param fetchCount 

*            每页显示数

* @param recordCount

*            数据总数

* @param pagePath

*            页面路径

* @return

*/

public static String getPageStr(int currentPage, int fetchCount,

int recordCount, String fileName,String sufFix) {

// String fileName = pagePath.split("\\.")[0];

// String sufFix = "." + pagePath.split("\\.")[1];

StringBuffer result = new StringBuffer();

String blankStr = "&nbsp;";

int maxLength = 4;

 

int pageCount = pageCount(recordCount, fetchCount);

 

if (pageCount > INDEX_PAGE_NUM) {

result.append("<span class='pagelink'>");

result.append("<a href='" + fileName + sufFix + "'>首页</a>");

if (currentPage > INDEX_PAGE_NUM) {

result.append(blankStr);

result.append("<a href='" + fileName);

if (currentPage - 1 != INDEX_PAGE_NUM) {

result.append("_" + (currentPage - 1));

}

result.append(sufFix + "'>上一页</a>");

 

}

result.append("</span>");

result.append(blankStr);

}

 

if (pageCount > INDEX_PAGE_NUM) {

result.append("<span class='pagelink'>");

for (int cou = ((currentPage - maxLength) > 0 ? maxLength

: currentPage - 1); cou >= 1; cou--) {

 

result.append("<a href='" + fileName);

if (currentPage - cou != INDEX_PAGE_NUM) {

result.append("_" + (currentPage - cou));

}

result.append(sufFix + "'>" + (currentPage - cou) + "</a>");

 

result.append(blankStr);

}

result.append("</span>");

 

result.append("<span class='pageon'>" + currentPage + "</span>");

 

result.append("<span class='pagelink'>");

for (int cou = 1; cou <= ((currentPage + maxLength) > pageCount ? pageCount

- currentPage

: maxLength); cou++) {

result.append("<a href='" + fileName + "_"

+ (currentPage + cou) + sufFix + "'>"

+ (currentPage + cou) + "</a>");

result.append(blankStr);

}

result.append("</span>");

}

 

if (pageCount > INDEX_PAGE_NUM) {

result.append("<span class='pagelink'>");

if (currentPage < pageCount) {

result.append("<a href='" + fileName + "_" + (currentPage + 1)

+ sufFix + "'>下一页</a>");

}

result.append(blankStr);

result.append("<a href='" + fileName + "_" + pageCount + sufFix

+ "'>末页</a>");

result.append("</span>");

}

 

return result.toString();

}

 

/**

* 动态分页条(自动带"page=?"的参数)

* 

* @param currentPage

*            当前页数

* @param fetchCount

*            每页显示数

* @param recordCount

*            数据总数

* @param pagePath

*            页面路径

* @param reqParam

*            页面参数

* @return

*/

public static String getParamPageStr(int currentPage, int fetchCount,

int recordCount, String pagePath, String reqParam) {

String fileName = pagePath.split("\\.")[0];

String sufFix = "." + pagePath.split("\\.")[1];

StringBuffer result = new StringBuffer();

String blankStr = "&nbsp;";

int maxLength = 4;

 

int pageCount = pageCount(recordCount, fetchCount);

 

if (pageCount > INDEX_PAGE_NUM) {

result.append("<span class='pagelink'>");

result.append("<a href='" + fileName + sufFix + "?" + reqParam

+ "&page=1" + "'>首页</a>");

if (currentPage > INDEX_PAGE_NUM) {

result.append(blankStr);

result.append("<a href='" + fileName);

result.append(sufFix + "?" + reqParam + "&page=");

result.append(currentPage - 1);

result.append("'>上一页</a>");

 

}

result.append("</span>");

result.append(blankStr);

}

 

if (pageCount > INDEX_PAGE_NUM) {

result.append("<span class='pagelink'>");

for (int cou = ((currentPage - maxLength) > 0 ? maxLength

: currentPage - 1); cou >= 1; cou--) {

 

result.append("<a href='" + fileName);

result.append(sufFix + "?" + reqParam + "&page=");

result.append(currentPage - cou);

result.append("'>" + (currentPage - cou) + "</a>");

 

result.append(blankStr);

}

result.append("</span>");

 

result.append("<span class='pageon'>" + currentPage + "</span>");

 

result.append("<span class='pagelink'>");

for (int cou = 1; cou <= ((currentPage + maxLength) > pageCount ? pageCount

- currentPage

: maxLength); cou++) {

result.append("<a href='" + fileName);

result.append(sufFix + "?" + reqParam + "&page=");

result.append((currentPage + cou));

result.append("'>" + (currentPage + cou) + "</a>");

result.append(blankStr);

}

result.append("</span>");

}

 

if (pageCount > INDEX_PAGE_NUM) {

result.append("<span class='pagelink'>");

if (currentPage < pageCount) {

result.append("<a href='" + fileName);

result.append(sufFix + "?" + reqParam + "&page=");

result.append((currentPage + 1) + "'>下一页</a>");

}

result.append(blankStr);

 

result.append("<a href='" + fileName);

result.append(sufFix + "?" + reqParam + "&page=");

result.append(pageCount + "'>末页</a>");

result.append("</span>");

}

 

return result.toString();

}

public static void main(String[] args){

System.out.println(getParamPageStr(2,1,3,"555.shtml",".shtml"));

}

}