通用分页（下）

接上一次的博客

servlet

package com.zhangsiwen.test.action;

import java.io.IOException;
import java.util.List;

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

import com.zhangsiwen.test.dao.StudentDao;
import com.zhangsiwen.test.entity.Student;
import com.zhangsiwen.test.util.PageBean;

public class StudentServlet extends HttpServlet{
	
	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doPost(req, resp);
	}
	
	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		//获取参数
		Student stu = new Student();
		StudentDao  studao = new StudentDao();
		stu.setSname(req.getParameter("sname"));
		
		//初始化分页
		PageBean pageBean = new PageBean();
		pageBean.setRequest(req);
		req.setAttribute("pageBean", pageBean);
		//后台分页查询
		List student= studao.find(stu,pageBean);
		req.setAttribute("student", student);
		//跳转界面
		req.getRequestDispatcher("/studentList.jsp").forward(req, resp);
	
	}
}

配置web.xml

  J2EE_09
  
    index.html
    index.htm
    index.jsp
    default.html
    default.htm
    default.jsp
  
  
  
  	EncodingFiter
  	com.zhangsiwen.test.util.EncodingFiter
  
  
  	EncodingFiter
  	/*
  
  
  
  
  	studentServlet
  	com.zhangsiwen.test.action.StudentServlet
  
  
  
   studentServlet
   /studentAction.action
  

写一个.tld文件

	1.0
	1.2
	Simple Tags
	/zhangsiwen
	
	
	
		page
		com.zhangsiwen.test.tag.PageTag
		jsp
		
			pageBean
			true
			true
		
	

page的标签助手类

package com.zhangsiwen.test.tag;

import java.lang.reflect.InvocationTargetException;
import java.util.Map;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.BodyTagSupport;


import com.zhangsiwen.test.util.PageBean;

public class PageTag extends BodyTagSupport{

	private static final long serialVersionUID = 1L;
	private PageBean pageBean;
	public PageBean getPageBean() {
		return pageBean;
	}
	public void setPageBean(PageBean pageBean) {
		this.pageBean = pageBean;
	}
	
	@Override
	public int doStartTag() throws JspException {
		try {
			JspWriter out= this.pageContext.getOut();
			out.println(toHtml());
			return SKIP_BODY;
		} catch (Exception e) {
			throw new RuntimeException(e);
		}
		
	}
	
	public String toHtml() throws IllegalAccessException, InvocationTargetException, NoSuchMethodException {
		StringBuffer sb=new StringBuffer();
		//防止pagebean空指针异常
		if(null==pageBean||!pageBean.isPagination()) {
			return sb.toString();
		}
		//分页按钮
		sb.append("
\r\n" + 
				" 		当前第"+pageBean.getPage()+"页   共"+pageBean.getMaxPage()+"页   共"+pageBean.getTotal()+"条  \r\n" + 
				" 		首页 \r\n" + 
				" 		上一页 \r\n" + 
				" 		下一页 \r\n" + 
				" 		尾页\r\n" + 
				" 		\r\n" + 
				" 		GO\r\n" + 
				" 	
");
		
		//分页隐藏域表单 专门用来传递数据的
		sb.append("
");
		sb.append("");
		//从map集合中获取参数
		Map parameterMap= pageBean.getParameterMap();
		//遍历集合
		for(Map.Entry entry:parameterMap.entrySet()) {
			String name=entry.getKey();
			String[] value=entry.getValue();
			if("page".equals(name)) {//将上一次的页面抛掉
				continue;//退出循环进入下一个循环
			}
			//遍历数组
			for (int i = 0; i < value.length; i++) {
				sb.append("");
			}
		}
		sb.append("");
		//动态拼接js
		sb.append("");
		return sb.toString();
	}
	
}

在jsp页面中调用自定义标签

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
    <%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
    <%@taglib prefix="z" uri="/zhangsiwen" %>





 


 
学生查询  <%= System.currentTimeMillis() %>  
 	

 		姓名：
 		
 	
 	
 		
 
 		

 		 	
学号
 		 	
姓名
 		 	
年龄
 		 	
备注
 		 	
操作
 		
 		

 		 	
${s.sid }
 		 	
${s.sname }
 		 	
${s.age }
 		 	
${s.remark }
 		 	
操作
 		
 		
 	
 	

运行结果：

总结：
我们在写了一遍通用分页之后，在之后需要使用到的时候就可以拿来使用。