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最新推荐文章于 2021-01-20 02:13:45 发布

最新推荐文章于 2021-01-20 02:13:45 发布 · 180 阅读

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#Struts #Java #Apache #JSP #Bean

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本文介绍了一个使用Struts框架实现的学生信息分页查询展示系统。该系统通过PageController类处理分页逻辑，根据用户请求的页码展示对应的学生信息列表，并提供翻页功能。同时展示了如何在JSP页面中使用Struts标签库来简化页面元素的生成。

display.jsp


<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>
<jsp:directive.page import="po.Student;"/>
<%@ taglib uri="http://struts.apache.org/tags-bean" prefix="bean" %>
<%@ taglib uri="http://struts.apache.org/tags-html" prefix="html" %>
<%@ taglib uri="http://struts.apache.org/tags-logic" prefix="logic" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>    
    <title>My JSP 'queryForm.jsp' starting page</title>
  </head>

  <body>
   显示结果. <br>
   <table bgcolor="#ff80ff">
   <tr>
   <td>学号</td>
   <td>姓名</td>
   <td>性别</td>
   <td>出生年月</td>
   <td>家庭住址</td>
   </tr>
  <logic:iterate id="stu" name="pc" property="smallList">
   <tr>
   <td><bean:write name="stu" property="stuId"/></td>
   <td><bean:write name="stu" property="stuName"/></td>
   <td><bean:write name="stu" property="stuSex"/></td>
   <td><bean:write name="stu" property="stuBir"/></td>
   <td><bean:write name="stu" property="stuAdd"/></td>
  </tr> 
  </logic:iterate>
   </table>
   <html:link action="/query.do?PageIndex=1">首页</html:link>
   <logic:equal name="pc" property="firstPage" value="false">
     	 <html:link action="/query.do" paramId="PageIndex" paramName="pc" paramProperty="prePageIndex">上一页</html:link>
   </logic:equal>
   <logic:equal name="pc" property="lastPage" value="false">
   		<html:link action="/query.do" paramId="PageIndex" paramName="pc" paramProperty="nextPageIndex">下一页</html:link>
   </logic:equal>
   <html:link action="/query.do" paramId="PageIndex" paramName="pc" paramProperty="pageCount">尾页</html:link>
  </body>
</html>

PageController.java


package prj13_1;

import java.util.ArrayList;

//负责传入一个大的集合，根据页号返回所需要的数据
/*
 * 页数=  
		记录条数%每页条数＝＝0     记录条数/每页条数
		否则          记录条数/每页条数+1
		第N页显示第几条记录(记录从0开始算)? (N-1)*每页条数=<序号< N*每页条数
 * */
public class PageController {
	private ArrayList bigList;			//大的集合，外界传入
	private int curentPageIndex = 1;	//当前页号，外界传入
	private int countPerpage 	= 5;	//每页条数，外界可以设定
	private ArrayList smallList;		//小的集合，返回
	private int pageCount;				//页数
	private int recordCount;			//记录条数
	private int prePageIndex;			//上一页序号
	private int nextPageIndex;			//下一页序号
	private boolean firstPage;			//是否第一页
	private boolean lastPage;			//是否最后一页

	public void setCurentPageIndex(int curentPageIndex) {	//每当页数改变，都会调用这个函数，筛选代码可以写在这里		
		this.curentPageIndex = curentPageIndex;

		//上一页，下一页确定
		prePageIndex = curentPageIndex - 1;
		nextPageIndex = curentPageIndex + 1;
		//是否第一页，最后一页
		if(curentPageIndex==1){
			firstPage = true;
		}
		else{
			firstPage = false;
		}
		if(curentPageIndex==pageCount){
			lastPage = true;
		}
		else{
			lastPage = false;
		}
		//筛选工作
		smallList = new ArrayList();
		for(int i=(curentPageIndex-1)*countPerpage; i<curentPageIndex*countPerpage&&i<recordCount; i++){
			smallList.add(bigList.get(i));
		}	
	}
	public int getCurentPageIndex() {
		return curentPageIndex;
	}
	public ArrayList getBigList() {
		return bigList;
	}
	public void setBigList(ArrayList bigList) {
		this.bigList = bigList;
		//计算条数
		recordCount = bigList.size();
		//计算页数
		if(recordCount%countPerpage==0){
			pageCount = recordCount/countPerpage;
		}
		else{
			pageCount = recordCount/countPerpage + 1;
		}

	}
	public int getCountPerpage() {
		return countPerpage;
	}
	public void setCountPerpage(int countPerpage) {
		this.countPerpage = countPerpage;
	}
	public ArrayList getSmallList() {
		return smallList;
	}
	public void setSmallList(ArrayList smallList) {
		this.smallList = smallList;
	}
	public int getPageCount() {
		return pageCount;
	}
	public void setPageCount(int pageCount) {
		this.pageCount = pageCount;
	}
	public int getRecordCount() {
		return recordCount;
	}
	public void setRecordCount(int recordCount) {
		this.recordCount = recordCount;
	}
	public int getNextPageIndex() {
		return nextPageIndex;
	}
	public void setNextPageIndex(int nextPageIndex) {
		this.nextPageIndex = nextPageIndex;
	}
	public int getPrePageIndex() {
		return prePageIndex;
	}
	public void setPrePageIndex(int prePageIndex) {
		this.prePageIndex = prePageIndex;
	}
	public boolean isFirstPage() {
		return firstPage;
	}
	public void setFirstPage(boolean firstPage) {
		this.firstPage = firstPage;
	}
	public boolean isLastPage() {
		return lastPage;
	}
	public void setLastPage(boolean lastPage) {
		this.lastPage = lastPage;
	}


}

QueryAction.java


/*
 * Generated by MyEclipse Struts
 * Template path: templates/java/JavaClass.vtl
 */
package prj13_1.action;

import java.util.ArrayList;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

import prj13_1.PageController;
import dao.StudentDao;

public class QueryAction extends Action {

	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response) {

		String str = request.getParameter("PageIndex");
		if(str==null)	{
			str = "1";
		}
		int currentPageIndex = Integer.parseInt(str);		

		PageController pc = (PageController)request.getAttribute("pc");
		if(pc==null){
			pc = new PageController();
			StudentDao studentDao = new StudentDao();
			ArrayList stus = studentDao.queryStu();	
			pc.setBigList(stus);
			request.setAttribute("pc", pc);			
		}

		pc.setCurentPageIndex(currentPageIndex);


		return new ActionForward("/display.jsp");
	}
}