java 后台代码实现分页 demo 实力 自己写的 标签分页
package com.cszoc.sockstore.util;
import java.util.HashMap;
import java.util.Map;import javax.servlet.http.HttpServletRequest;
import org.apache.struts2.ServletActionContext;
/**
* 分页JavaBean * * */public class PageBean { /* 当前页 */ private int curPage=1;/* 总记录数 */
private int totalRecord = 0;/* 每页记录数 */
private int pageRecord = 10;/* 是否分页，默认分页 */
private boolean paginate = true;/* 请求的URL */
private String url;/* 请求中的参数 */
private Map<String, String[]> parameters = new HashMap<String, String[]>();public PageBean() {
super(); }public PageBean(HttpServletRequest request) {
super(); this.setRequest(request); }/**
* 使用HttpServletRequest对象对分页Bean进行初始化 * */ @SuppressWarnings("unchecked") public void setRequest(HttpServletRequest request) { if(request.getAttribute("com.accp.book.util.PageBean")!=null) { PageBean p=(PageBean) request.getAttribute("com.accp.book.util.PageBean"); copy(p); } else { this.setCurPage(request.getParameter("curPage"));// 从请求中获取当前页 this.setPageRecord(request.getParameter("pageRecord"));// 从请求中获取页大小 this.setPaginate(request.getParameter("paginate"));// 获取用来判断是否分页的参数// System.out.println("001");// System.out.println(request.getContextPath());// System.out.println(request.getServletPath());// System.out.println(this);// System.out.println(request);// System.out.println("001"); this.setUrl(request.getContextPath() + request.getServletPath());// 获取表示请求资源的URL this.setParameters(new HashMap<String, String[]>(request .getParameterMap()));// 获取请求中的所有参数 } request.setAttribute("com.accp.book.util.PageBean", this);// 将分页Bean保存request作用域当中 }/**
* true表示进行分页 * * @return */ public boolean isPaginate() { return paginate; }/**
* 设置是否分页true分页，false不分页 * * @param paginate */ public void setPaginate(boolean paginate) { this.paginate = paginate; }/**
* 设置是否分页true分页，false不分页 * * @param paginate */ public void setPaginate(String paginate) { if (null != paginate && paginate.trim().equalsIgnoreCase("false")) { this.setPaginate(false); } else { this.setPaginate(true); } }public Map<String, String[]> getParameters() {
return parameters; }public void setParameters(Map<String, String[]> parameters) {
this.parameters = parameters; }public String getUrl() {
return url; }public void setUrl(String url) {
this.url = url; }public int getCurPage() {
return curPage; }public void setCurPage(int curPage) {
if (curPage > 1) { this.curPage = curPage; } }public void setCurPage(String curPage) {
if (null == curPage || curPage.trim().equals("")) { return; } int acurPage = Integer.parseInt(curPage); this.setCurPage(acurPage); }public int getPageRecord() {
return pageRecord; }public void setPageRecord(int pageRecord) {
this.pageRecord = pageRecord; }public void setPageRecord(String pageRecord) {
if (null != pageRecord && !pageRecord.trim().equals("")) { this.pageRecord = Integer.parseInt(pageRecord); } }public int getTotalRecord() {
return totalRecord; }public void setTotalRecord(int totalRecord) {
this.totalRecord = totalRecord; }/**
* 返回下一页页码 * * @return */ public int getNextPageNumber() { int nextPageNumber = this.curPage + 1; if (nextPageNumber > this.getMaxPageNumber()) { nextPageNumber = this.getMaxPageNumber(); } return nextPageNumber; }/**
* 返回上一页页码 * * @return */ public int getPreviousPageNumber() { int previousPageNumber = this.curPage - 1; if (previousPageNumber < 1) { previousPageNumber = 1; } return previousPageNumber; }/**
* 返回最大页码编号 * * @return */ public int getMaxPageNumber() { int maxPageNumber = 1; if (this.totalRecord > this.pageRecord) { if (0 == this.totalRecord % this.pageRecord) { maxPageNumber = this.totalRecord / this.pageRecord; } else { maxPageNumber = this.totalRecord / this.pageRecord + 1; } } return maxPageNumber; }/**
* 获取起始记录下标 * * @return */ public int getStartRecordIndex() { return this.pageRecord * (this.curPage - 1); }public String toString() {
StringBuffer bf = new StringBuffer(); bf.append("curPage=" + curPage); bf.append(", totalRecord=" + totalRecord); bf.append(", pageRecord=" + pageRecord); bf.append(", hashcode=" + hashCode()); return bf.toString(); } private void copy(PageBean p) { this.curPage=p.curPage; this.pageRecord=p.pageRecord; this.paginate=p.paginate; this.parameters=p.parameters; this.totalRecord=p.totalRecord; this.url=p.url; }}
html 标签前台分页
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package com.cszoc.sockstore.util;
import java.util.Iterator;
import java.util.Map;import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.BodyTagSupport;/**
* 通用分页标签 * */public class PageBeanTag extends BodyTagSupport {private static final long serialVersionUID = 8450962461296575662L;
public PageBeanTag() {
super(); }@Override
public int doStartTag() throws JspException { PageBean pageBean = (PageBean) pageContext.getRequest().getAttribute( "com.accp.book.util.PageBean"); if (null != pageBean && pageBean.isPaginate()) { if(null!=pageContext.getRequest().getAttribute("reseturl")) { pageBean=(PageBean) pageContext.getRequest().getAttribute("reseturl"); } try { // System.out.println("002");// System.out.println(pageBean.getUrl());// System.out.println(pageBean);// System.out.println("002"); pageContext.getOut().write(toHTML(pageBean)); } catch (Exception ex) { ex.printStackTrace(); throw new RuntimeException(ex); } } pageContext.getRequest().removeAttribute("com.accp.book.util.PageBean"); return SKIP_BODY; }/* 将分页JavaBean转换成HTML字符串 */
private String toHTML(PageBean pageBean) { // 保存请求的参数到一个表单对象中，以供下次查询使用 StringBuffer bf = new StringBuffer(); bf.append("<form name='pageBeanForm' action='" + pageBean.getUrl() + "' method='post'>"); bf.append("<input type='hidden' name='curPage' value=''/>");// 当前页是目前是空，但在点击分页按钮时会进行设置 Map<String, String[]> parameters = pageBean.getParameters();// 请求中的所有参数 String paramName = null; String[] paramValues = null; Iterator it = parameters.keySet().iterator(); while (it.hasNext()) { paramName = (String) it.next();// 参数名 if ("curPage".equals(paramName)) { continue;// 把当前页参数忽略掉 } paramValues = parameters.get(paramName);// 参数值 for (int i = 0; null != paramValues && i < paramValues.length; i++) { bf.append("<input type='hidden' name='" + paramName + "' value='" + paramValues[i] + "'/>"); } } bf.append("</form>");// 显示分页按钮
//bf.append("每页 " + pageBean.getPageRecord() + " 行"); //bf.append(" 共 " + pageBean.getTotalRecord() + " 行"); //bf.append(" 第 " + pageBean.getCurPage() + " 页"); //bf.append(" 共 " + pageBean.getMaxPageNumber() + " 页"); bf.append("<div class='page_div'><ul class='ulfleft ht_page'>"); bf.append("<li class='ht_li1'>第"+pageBean.getCurPage()+"页/共"+pageBean.getMaxPageNumber()+"页</li><li class='ht_page_bg1'><a href='javascript:gotoPage(" + 1 + ")'>首页</a></li>"+" "); if(pageBean.getCurPage()!=1){ bf.append(" "+" <li class='ht_page_bg1'><a href='javascript:gotoPage(" + pageBean.getPreviousPageNumber() + ")'>上一页</a></li>"+" "); } if(pageBean.getCurPage()<=3) { if(pageBean.getMaxPageNumber()<=3) { for(int i=1;i<=pageBean.getMaxPageNumber();i++) { if(pageBean.getCurPage()==i) { bf.append(" "+" <li class='li_hover'><a href='javascript:gotoPage("+ i + ")'>"+i+"</a></li>"+" "); i+=1; } if(pageBean.getMaxPageNumber()>=i){ bf.append(" "+" <li ><a href='javascript:gotoPage(" + i + ")'>"+i+"</a></li>"+" "); } } } else { for(int i=1;i<=3;i++){ if(pageBean.getCurPage()==i){ bf.append("<li class='li_hover'>"+i+"</li>"); i+=1; } if(pageBean.getMaxPageNumber()>=i){ bf.append(" "+"<li > <a href='javascript:gotoPage(" + i + ")'>"+i+"</a></li>"+" "); } } } } if(pageBean.getCurPage()<pageBean.getMaxPageNumber()-3&&pageBean.getCurPage()>3&&pageBean.getMaxPageNumber()>=3) { for(int i=pageBean.getCurPage()-2;i<=pageBean.getCurPage()+2;i++) { if(pageBean.getCurPage()==i) { bf.append("<li class='li_hover'>"+i+"</li>"); i+=1; } bf.append(" "+" <li ><a href='javascript:gotoPage(" + i + ")'>"+i+"</a></li>"+" "); } } if(pageBean.getCurPage()>=pageBean.getMaxPageNumber()-3&&pageBean.getMaxPageNumber()>=3&&pageBean.getCurPage()>3){ for(int i=pageBean.getMaxPageNumber()-3;i<=pageBean.getMaxPageNumber();i++){ if(pageBean.getCurPage()==i){ bf.append("<li class='li_hover'>"+i+"</li>"); i+=1; } if(pageBean.getMaxPageNumber()>=i){ bf.append(" "+"<li > <a href='javascript:gotoPage(" + i + ")'>"+" "+i+" "+"</a></li>"+" "); } } } if(pageBean.getCurPage()!=pageBean.getMaxPageNumber()){ bf.append(" "+"<li class='ht_page_bg1'> <a href='javascript:gotoPage(" + pageBean.getNextPageNumber() + ")'>下一页</a></li>"+" "); }bf.append(" "+" <li class='ht_page_bg1'><a href='javascript:gotoPage("
+ pageBean.getMaxPageNumber() + ")'>末页</a></li>");//</ul></div> bf.append(" "+" <li class='ht_page_bg1'><a href='javascript:jumpPage();'>跳转</a> </li>"); bf.append(" "+" <li class='ht_page_bg2'>到<input type='text' class='fenye_txt' id='pageNumber'>页</li></ul></div>"); //bf.append(" 页数 <input type='text' id='pageNumber' style='width:20px;' /> <a href='javascript:jumpPage()'>GO</a>");// 动态生成js
bf.append("<script>"); bf .append("function gotoPage(curPage){document.pageBeanForm.curPage.value=curPage;document.pageBeanForm.submit();}"); bf.append("var maxPageNumber =" + pageBean.getMaxPageNumber() + ";"); bf .append("function jumpPage(){var curPage=document.getElementById('pageNumber').value;if(curPage==''||isNaN(curPage)||parseInt(curPage)<1||parseInt(curPage)>maxPageNumber){alert('请输入一个正确的页码');return;}gotoPage(curPage);}"); bf.append("</script>");return bf.toString();
}}