java 模糊查询分页(自定义标签)

本次的实现是采用struts2+hibernate+分页标签实现

class :PagerTag 是用来实现自定义分页标签,继承SimpleTagSupport实现自定义标签

public class PagerTag extends SimpleTagSupport { private String uri;//分页要执行的action路径 private Integer curpage;//当前页 private Integer pagesize;//每页显示的记录数 private Integer pagecount;//总页数 private Integer rowcount;//总记录数 public Integer getCurpage() { return curpage; } public void setCurpage(Integer curpage) { this.curpage = curpage; } public Integer getPagesize() { return pagesize; } public void setPagesize(Integer pagesize) { this.pagesize = pagesize; } public Integer getPagecount() { return pagecount; } public void setPagecount(Integer pagecount) { this.pagecount = pagecount; } public Integer getRowcount() { return rowcount; } public void setRowcount(Integer rowcount) { this.rowcount = rowcount; } public String getUri() { return uri; } public void setUri(String uri) { this.uri = uri; } //每次执行标签时会调用toTag public void doTag() throws JspException, IOException { //获得页面的输出流 JspWriter out = this.getJspContext().getOut(); //通过流往页面写数据 out.println("<div class=/"pager/">"); out.println("共" +rowcount+ "行记录,每页"); out.println("<input value=/""+ pagesize + "/" size=/"2/" />条"); out.println("当前第<input value=/"" + (curpage +1 )+"/" size=/"2/"/>页/共"+ pagecount + "页"); out.println("<a href="/" mce_href="/""" + uri+"&curpage=0/">第一页</a>"); if(curpage > 0) { out.println("<a href="/" mce_href="/""" + uri+"&curpage="+(curpage-1)+"/">上一页</a>"); } if(curpage < pagecount -1) { out.println("<a href="/" mce_href="/""" + uri+"&curpage=" + (curpage+1)+"/">下一页</a>"); } out.println("<a href="/" mce_href="/""" + uri+"&curpage=" +(pagecount-1)+"/">最后一页</a>"); out.println("</div>"); } }

标签的tld文件：my.tld

<?xml version="1.0" encoding="UTF-8" ?> <taglib xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-jsptaglibrary_2_1.xsd" version="2.1"> <tlib-version>1.1</tlib-version> <short-name>my</short-name>  <uri>http://java.pojo.com/tag</uri>  <tag> <name>pager</name> <tag-class>com.pojo.web.tag.PagerTag</tag-class> <body-content>empty</body-content> <attribute> <name>uri</name> <required>true</required> <rtexprvalue>true</rtexprvalue> </attribute> <attribute> <name>curpage</name> <required>true</required> <rtexprvalue>true</rtexprvalue> </attribute> <attribute> <name>pagesize</name> <required>true</required> <rtexprvalue>true</rtexprvalue> </attribute> <attribute> <name>pagecount</name> <required>true</required> <rtexprvalue>true</rtexprvalue> </attribute> <attribute> <name>rowcount</name> <required>true</required> <rtexprvalue>true</rtexprvalue> </attribute> </tag> </taglib>

模糊查询加分页的展示jsp界面

<textarea cols="87" rows="15" name="code" class="xhtml"><%@ page language="java" import="java.util.*" pageEncoding="gb2312"%> <%@ taglib prefix="s" uri="/struts-tags" %> <%@ taglib uri="http://java.pojo.com/tag" prefix="my" %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>管理电影档期</title>  <link rel="stylesheet" type="text/css" href="/project/css/style_admin.css" mce_href="project/css/style_admin.css"> <mce:script type="text/javascript" src="/project/js/date.js" mce_src="project/js/date.js"></mce:script> </head> <body> <form action="Release_findAllPaging.action" method="post" name="form1"> <table cellspacing="0" cellpadding="4" width="100%" class="tableborder" id="table3"> <tr> <td class="header" colspan="7"> 信息查询 </td> </tr> <tr align="left"> <td width="52px">影片名称</td> <td width="60px"><input type="text" name="filmInfo.fname" /></td> <td width="52px">影厅名称</td> <td width="60px"><s:action name="Cinemainfo2_findAll" namespace="/" executeResult="true" ignoreContextParams="true" /></td> <td width="26px">日期</td> <td width="60px"><INPUT name="rdate" onFocus="this.select();" readonly="readonly" onClick="fPopCalendar(event,this,this);" size="20px" /></td> <td><input type="submit" value="查询"/></td> </tr> </table> </form> <table cellspacing="1" cellpadding="4" width="100%" class="tableborder" id="table3"> <tr> <td colspan="9" class="header"> 电影档期管理 </td> </tr> <tr> <td align="center" class="altbg1"> <b>电影图片</b> </td> <td align="center" class="altbg1"> <b>电影名称</b> </td> <td align="center" class="altbg1"> <b>日期</b> </td> <td align="center" class="altbg1"> <b>时间</b> </td> <td align="center" class="altbg1"> <b>影厅</b> </td> <td align="center" class="altbg1"> <b>票价</b> </td> <td align="center" class="altbg1"> <b>编辑</b> </td> <td align="center" class="altbg1"> <b>删除</b> </td> <td align="center" class="altbg1"> <b>查看电影订票情况</b> </td> </tr> <s:iterator value="#request.list"> <tr> <td align="center" class="altbg2"> <img src="<s:property value=" mce_src="<s:property value="filmInfo.image" />" width="100px" height="100px" /> </td> <td class="altbg2" align="center"> <s:property value="filmInfo.fname" /> </td> <td class="altbg2" align="center"> <s:date name="rdate" format="yyyy-MM-dd" /> </td> <td class="altbg2" align="center"> <s:date name="rtime" format="HH:mm" /> </td> <td class="altbg2" align="center"> <s:property value="cinemaInfo.cname" /> </td> <td class="altbg2" align="center"> <s:property value="filmInfo.price" />元 </td> <td class="altbg2" align="center"> <a href="javascript:if(confirm('确实要删除吗?'))window.location='Release_delete.action?rid=<s:property value=" mce_href="javascript:if(confirm('确实要删除吗?'))window.location='Release_delete.action?rid=<s:property value="rid" ></a>'">删除</a> </td> <td class="altbg2" align="center"> <a href="Release_show.action?rid=<s:property value=" mce_href="Release_show.action?rid=<s:property value="rid" ></a>">修改</a> </td> <td class="altbg2" align="center"> <a href="SaleAction_getSaleByCondition.action?cid=<s:property value=" mce_href="SaleAction_getSaleByCondition.action?cid=<s:property value="cinemaInfo.cid"></a>&fid=<s:property value="filmInfo.fid"/>&rdate=<s:date name="rdate" format="yyyy-MM-dd"/>&rtime=<s:property value="rtime"/>">查看</a> </td> </tr> </s:iterator> <tr style="font-size:12px" mce_style="font-size:12px" align="right"> <th colspan="100" class="pager"> <my:pager uri="Release_findAllPaging.action?temp=1&filmInfo.fname=${fname}&cinemaInfo.cid=${cid}&rdate=${rdate}" curpage="${ curpage }" pagesize="${ pagesize}" pagecount="${ pagecount}" rowcount="${rowcount }" /> </th> </tr> </table> </body> </html> </textarea>

这里注意到的一点就是需要导入自定义标签

还有一点注意到自定义标签<my> uri的写法由于我的想法是将查询条件利用参数传递过去(参数存在request作用域下)

最重要的就是我在路径后面加上了一个temp参数方便没有带条件的查询[条件的参数为空] (需要对比前面的分页标签类里的uri写法)

上面 Release_findAllPaging.action 在struts.xml里配置不打算贴出来了对应的类是ReleaseAction 调用的dao类为ReleaseDao

ReleaseAction类重要方法和属性(get set 方法省略...)

//保存分页的属性 protected Integer curpage = 0;//当前第几页 protected Integer pagesize = 4;//每页条数 protected Integer pagecount;//总页数 protected Integer rowcount; //总行数 //分页查询 public String findAllPaging(){ //地址栏提交中文 tomcat 配置 URIEncoding="GB2312" HttpServletRequest req = ServletActionContext.getRequest();//拿到请求对象 //表单里的值 String fname = req.getParameter("filmInfo.fname"); String cid = req.getParameter("cinemaInfo.cid"); String rdate = req.getParameter("rdate"); if(fname != null && !fname.equals("")){ req.setAttribute("fname", fname);//不为空的话,放到request作用域下 } if(cid != null && !cid.equals("")){ req.setAttribute("cid", cid); } if(rdate != null && !rdate.equals("")){ req.setAttribute("rdate", rdate); } if(fname == null){ fname = (String)req.getAttribute("fname");//等于空从request作用域下取 } if(cid == null){ cid = (String)req.getAttribute("cid"); } if(rdate == null || rdate.equals("")){ rdate = (String)req.getAttribute("rdate"); } request.put("list",dao.findAllPaging(curpage, pagesize, fname, cid, rdate));//查询当前页的记录放到list里 //存入当前页 request.put("curpage", curpage); //存入每页条数 request.put("pagesize", pagesize); //调用dao获得总行数 Integer rowcount = dao.getRowCount(fname,cid,rdate); //算出总页数 //101行，每页10条 10.1 使用11页 int pagecount =(int)Math.ceil( (rowcount /( pagesize + 0.0)) ); //总页数 request.put("pagecount", pagecount); //总条数 request.put("rowcount", rowcount); return "listAction"; }

dao类重要方法

//根据条件模糊查询总记录数 public Integer getRowCount(String fname,String cid,String rdate){ String strSQL = "select count(r) from Release as r where 1 = 1"; if(fname != null && !fname.equals("")){//如果equals在前面的话，容易报 nullpoint 异常 strSQL += " and r.filmInfo.fname like :fname"; } if(cid != null && !cid.equals("")){ strSQL += " and r.cinemaInfo.cid = :cid"; } if(rdate != null && !rdate.equals("")){ strSQL += " and r.rdate = :rdate"; } Query query = HibernateSessionFactory.getSession().createQuery(strSQL); if(fname != null && !fname.equals("")){//如果equals在前面的话，容易报 nullpoint 异常 query.setString("fname", "%" + fname + "%"); } if(cid != null && !cid.equals("")){ query.setInteger("cid", new Integer(cid)); } if(rdate != null && !rdate.equals("")){ query.setString("rdate", rdate); } List list = query.list(); return (Integer)list.get(0); } //分页模糊查询档期 public List findAllPaging(int curpage,int pagesize,String fname,String cid,String rdate) { String strSQL = "select r from Release as r where 1 = 1"; if(fname != null && !fname.equals("")){//如果equals在前面的话，容易报 nullpoint 异常 strSQL += " and r.filmInfo.fname like :fname"; } if(cid != null && !cid.equals("")){ strSQL += " and r.cinemaInfo.cid = :cid"; } if(rdate != null && !rdate.equals("")){ strSQL += " and r.rdate = :rdate"; } Query query = HibernateSessionFactory.getSession().createQuery(strSQL); if(fname != null && !fname.equals("")){//如果equals在前面的话，容易报 nullpoint 异常 query.setString("fname", "%" + fname + "%"); } if(cid != null && !cid.equals("")){ query.setInteger("cid", new Integer(cid)); } if(rdate != null && !rdate.equals("")){ query.setString("rdate", rdate); } query.setFirstResult(curpage*pagesize) .setMaxResults(pagesize); List list = query.list(); return list; }

还有要注意点的是条件是采用get方式传递中文的问题解决需在tomcat下配置文件加上URIEncoding="GB2312"

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