基于prototype.js和spring的ajax分页

这是一个基于prototype.js的ajax分页，运用了spring框架，自定义分页标签，每次进入列表页面时，把列表存入session，分页只对session存储的列表进行分页，不需要再去查询数据库。但在数据量十分大的情况下，没有做性能测试。

首先在web.xml中配置spring监听和servlet

web.xml内容如下：

# <?xml version="1.0" encoding="UTF-8"?>  
# <web-app version="2.5"   
#     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-app_2_5.xsd">  
#   
#   
#   <context-param>  
#     <param-name>contextConfigLocation</param-name>  
#     <param-value>classpath*:com/kt/application/application-context.xml</param-value>  
#   </context-param>  
#   
#   <listener>  
#     <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>  
#   </listener>  
#   
#   <servlet>  
#     <servlet-name>root-dispatcher</servlet-name>  
#     <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>  
#     <load-on-startup>1</load-on-startup>  
#   </servlet>  
#   
#   <servlet-mapping>  
#     <servlet-name>root-dispatcher</servlet-name>  
#     <url-pattern>*.do</url-pattern>  
#   </servlet-mapping>  
#   
#   <welcome-file-list>  
#     <welcome-file>index.jsp</welcome-file>  
#   </welcome-file-list>  
# </web-app> 

还需要在WEB-INF下建个root-dispatcher-servlet.xml的文件（没有这个文件会报错，为什么少了这个会出错就不知道了）

root-dispatcher-servlet.xml内容如下：

# <?xml version="1.0" encoding="UTF-8"?>  
#   
# <beans xmlns="http://www.springframework.org/schema/beans"  
#     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
#     xmlns:util="http://www.springframework.org/schema/util"  
#     xmlns:lang="http://www.springframework.org/schema/lang"  
#     xmlns:aop="http://www.springframework.org/schema/aop"  
#     xmlns:tx="http://www.springframework.org/schema/tx"  
#     xsi:schemaLocation="  
#         http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd  
#         http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-2.0.xsd  
#         http://www.springframework.org/schema/lang http://www.springframework.org/schema/lang/spring-lang-2.0.xsd  
#         http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd  
#         http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd">  
#   
# </beans>

下面是spring的配置文件,文件名是application-context.xml(为了方便spring的配置都写这个文件里了)，启动tomcat 的时候加载

application-context.xml 内容如下

# <?xml version="1.0" encoding="UTF-8"?>  
#   
# <beans xmlns="http://www.springframework.org/schema/beans"  
#     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
#     xmlns:util="http://www.springframework.org/schema/util"  
#     xmlns:lang="http://www.springframework.org/schema/lang"  
#     xmlns:aop="http://www.springframework.org/schema/aop"  
#     xmlns:tx="http://www.springframework.org/schema/tx"  
#     xsi:schemaLocation="  
#         http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd  
#         http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-2.0.xsd  
#         http://www.springframework.org/schema/lang http://www.springframework.org/schema/lang/spring-lang-2.0.xsd  
#         http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd  
#         http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd">  
#   
#     <bean id="requiredChecker" class="org.springframework.beans.factory.annotation.RequiredAnnotationBeanPostProcessor" />  
#       
#     <bean name="urspin:urlMap" scope="singleton" lazy-init="true"  
#         class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">  
#         <property name="mappings">  
#             <props>  
#                 <prop key="/test/testController.do">testController</prop>  
#                 <prop key="/test/paginationController.do">paginationController</prop>  
#             </props>  
#         </property>  
#     </bean>  
#   
#     <bean id="testController" lazy-init="true" scope="singleton"  
#         class="com.kt.controller.TestController">  
#         <property name="pageSize" value="5"/>  
#         <lookup-method name="getModelAndView" bean="testGetModelAndView"/>  
#     </bean>  
#       
#     <bean id="testGetModelAndView" lazy-init="true" scope="prototype"  
#         class="org.springframework.web.servlet.ModelAndView">  
#         <property name="viewName" value="/page/test.jsp" />  
#     </bean>  
#       
#     <bean id="paginationController" lazy-init="true" scope="singleton"  
#         class="com.kt.controller.PaginationController">  
#         <lookup-method name="getModelAndView" bean="paginationControllerGetModelAndView"/>  
#     </bean>  
#       
#     <bean id="paginationControllerGetModelAndView" lazy-init="true" scope="prototype"  
#         class="org.springframework.web.servlet.ModelAndView">  
#         <property name="viewName" value="/page/test_1.jsp" />  
#     </bean>  
# </beans>

下面开始写分页标签，文件名为TagTest，要继承TagSupport类

TagTest.java 内容如下

# package com.kt.tag;  
#   
# import java.io.IOException;  
# import java.util.List;  
#   
# import javax.servlet.http.HttpSession;  
# import javax.servlet.jsp.JspWriter;  
# import javax.servlet.jsp.tagext.TagSupport;  
#   
# public class TagTest extends TagSupport  
# {  
#     private int pageSize;  
#       
#     private List list;  
#   
#     private String url;  
#   
#     private String location;  
#   
#     public int doStartTag()  
#     {  
#         JspWriter out = pageContext.getOut();// 用pageContext获取out，他还能获取session等，  
#         // 基本上jsp的内置对象都能获取  
#         HttpSession session = (HttpSession) pageContext.getSession();  
#         session.setAttribute("list", list);  
#   
#         int pageCount = (int)Math.ceil((double)list.size()/pageSize);  
#   
#         StringBuffer strBuffer = new StringBuffer();  
#         strBuffer.append("<table><tr><td>").append("共")  
#                 .append(list.size()).append("条").append("</td><td>")  
#                 .append("<span id=\"current\"></span>").append("/").append(pageCount).append("页</td><td>")  
#                 .append("<input id=\"txt\" type=\"text\" size=\"1\" /><a href= \"javascript:goto()\">跳转</a>").append("</td>")  
#                 .append("<td><a href="\" mce_href="\""javascript:firstPage();\">首页</a></td>").append(  
#                         "<td><a href="\" mce_href="\""javascript:prePage(); \">上一页</a></td>")  
#                 .append("<td><a href="\" mce_href="\""javascript:nextPage(); \">下一页</a></td>").append(  
#                         "<td><a href="\" mce_href="\""javascript:endPage()\">最后一页</a>").append("</td>").append(  
#                         "</tr>").append("</table>").append("<mce:script type="text/javascript"><!--  
#  var currentPage = 1;\n").append(  
#                         "function page(currentPage1){").append("new Ajax.Updater(")  
#                 .append("\"").append(location).append("\"").append(",").append(  
#                         "\"").append(url).append(  
#                         "\",{method:\"post\", parameters:\"")  
#                 .append("currentPage=").append("\" + currentPage1 + \"").append("&pageSize=")  
#                 .append(pageSize).append("\"}); }")  
#                 .append("\nfunction prePage(){ if( 1==currentPage){ page(1); }else{ currentPage = currentPage - 1; document.getElementById(\"current\").innerHTML = currentPage; page(")  
#                 .append("currentPage").append("); }")  
#                 .append("}\n")  
#                 .append("function nextPage(){ if(currentPage!=").append(pageCount).append("){currentPage = currentPage + 1; document.getElementById(\"current\").innerHTML = currentPage; page(").append("currentPage").append(");}}\n")  
#                 .append("function firstPage(){ currentPage = 1; document.getElementById(\"current\").innerHTML = currentPage; page(currentPage); }\n")  
#                 .append("function endPage(){ currentPage = ").append(pageCount).append("; page(currentPage); document.getElementById(\"current\").innerHTML = currentPage;}\n")  
#                 .append("function goto(){var targetPage = document.getElementById(\"txt\").value;")  
#                 .append("if(\"\" == targetPage){alert(\"没有输入页码\"); return;}")  
#                 .append("if(!(targetPage.search(\"^-?\\\\d+$\")!=0) && 0<targetPage && targetPage<=").append(pageCount).append(") {currentPage = targetPage; document.getElementById(\"current \").innerHTML = currentPage; page(currentPage);}else{alert(\"输入的页码不正确 \");}")  
#                 .append("document.getElementById(\"txt\").value = \"\";}\n")  
#                 .append("document.getElementById(\"current\").innerHTML = currentPage;")  
#                 .append("  
# // --></mce:script>");  
#         if (Integer.valueOf(pageSize) instanceof Integer)  
#         {  
#             try  
#             {  
#                 out.println(strBuffer.toString());  
#             } catch (IOException e)  
#             {  
#                 e.printStackTrace();  
#             }  
#         } else  
#         {  
#   
#             try  
#             {  
#                 out.println("<table>");  
#                 out.println("<tr>");  
#                 out.println("<td>");  
#                 out.println("你输入的参数格式不对");  
#                 out.println("</td>");  
#                 out.println("<td>");  
#   
#                 out.println("</td>");  
#                 out.println("</tr>");  
#                 out.println("</table>");  
#             } catch (IOException e)  
#             {  
#                 e.printStackTrace();  
#             }  
#         }  
#         return EVAL_PAGE;// 标签执行完后，继续执行后面的  
#     }  
#   
#     public int doEndTag()  
#     {  
#         return SKIP_BODY;// 标签执行完后，不继续执行后面的  
#     }  
#   
#     public int getPageSize()  
#     {  
#         return pageSize;  
#     }  
#   
#     public void setPageSize(int pageSize)  
#     {  
#         this.pageSize = pageSize;  
#     }  
#   
#     public List getList()  
#     {  
#         return list;  
#     }  
#   
#     public void setList(List list)  
#     {  
#         this.list = list;  
#     }  
#   
#     public String getUrl()  
#     {  
#         return url;  
#     }  
#   
#     public void setUrl(String url)  
#     {  
#         this.url = url;  
#     }  
#   
#     public String getLocation()  
#     {  
#         return location;  
#     }  
#   
#     public void setLocation(String location)  
#     {  
#         this.location = location;  
#     }  
# }

写好java标签后，在WEB-INF下建立个tld类型的文件配置标签，我建的标签配置文件叫tagLib

tagLib.tld 内容如下：

# <?xml version="1.0" encoding="UTF-8"?>  
# <!DOCTYPE taglib PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.1//EN"  
#                         "http://java.sun.com/j2ee/dtds/web-jsptaglibrary_1_1.dtd">  
# <taglib>  
#  <tlibversion>1.2</tlibversion>  
#  <jspversion>1.1</jspversion>  
#  <shortname>bean</shortname>  
#  <uri>MyTagLib</uri>  
#  <tag>  
#   <name>showDataTag</name>  
#   <tagclass>com.kt.tag.TagTest</tagclass>  
#   
#   <attribute>  
#    <name>pageSize</name>  
#    <required>true</required>  
#    <rtexprvalue>true</rtexprvalue>  
#   </attribute>  
#   
#   <attribute>  
#    <name>list</name>  
#    <required>true</required>  
#    <rtexprvalue>true</rtexprvalue>  
#   </attribute>  
#   
#   <attribute>  
#    <name>url</name>  
#    <required>true</required>  
#    <rtexprvalue>true</rtexprvalue>  
#   </attribute>  
#   
#   <attribute>  
#    <name>location</name>  
#    <required>true</required>  
#    <rtexprvalue>true</rtexprvalue>  
#   </attribute>  
#   
#  </tag>  
# </taglib>

现在开始写用于显示列表的两个controller

TestController.java用于首次进入列表页面(test.jsp)，分页时调用PaginationController.java，返回一个简单页面(test_1.jsp),并局部刷新test.jsp页面

TestController.java 内容如下

# package com.kt.controller;  
#   
# import java.util.ArrayList;  
# import java.util.List;  
#   
# import javax.servlet.http.HttpServletRequest;  
# import javax.servlet.http.HttpServletResponse;  
#   
# import org.springframework.beans.factory.annotation.Required;  
# import org.springframework.web.servlet.ModelAndView;  
# import org.springframework.web.servlet.mvc.AbstractController;  
#   
# import com.kt.entity.Person;  
# import com.kt.entity.impl.PersonImpl;  
#   
# public class TestController extends AbstractController  
# {  
#     private int pageSize;  
#   
#     private ModelAndView modelAndView;  
#   
#     @Override  
#     protected ModelAndView handleRequestInternal(HttpServletRequest request,  
#             HttpServletResponse response) throws Exception  
#     {  
#         List<Person> list = new ArrayList<Person>();  
#         for(int i = 0; i<23; i++)  
#         {  
#             Person person = new PersonImpl();  
#             person.setUserName("name_" + i);  
#             person.setAge(i);  
#             list.add(person);  
#         }  
#           
#   
#         List<Person> pageList = list.subList(0, pageSize);  
#           
#         ModelAndView modelAndView = getModelAndView();  
#         modelAndView.addObject("list", list);  
#         modelAndView.addObject("pageList", pageList);  
#         return modelAndView;  
#     }  
#   
#     @Required  
#     public void setPageSize(int pageSize)  
#     {  
#         this.pageSize = pageSize;  
#     }  
#   
#     public ModelAndView getModelAndView()  
#     {  
#         return modelAndView;  
#     }  
# }

其中pageSize属性在spring配置文件中注入，其值应该与页面标签代码中的pageSize相同，否则分页会不正确

PaginationController.java内容如下

# package com.kt.controller;  
#   
# import java.util.ArrayList;  
# import java.util.List;  
#   
# import javax.servlet.http.HttpServletRequest;  
# import javax.servlet.http.HttpServletResponse;  
#   
# import org.springframework.web.servlet.ModelAndView;  
# import org.springframework.web.servlet.mvc.AbstractController;  
#   
# public class PaginationController extends AbstractController  
# {  
#     private ModelAndView modelAndView;  
#   
#     @SuppressWarnings("unchecked")  
#     @Override  
#     protected ModelAndView handleRequestInternal(HttpServletRequest request,  
#             HttpServletResponse response) throws Exception  
#     {  
#         int pageSize = Integer.valueOf(request.getParameter("pageSize"));  
#   
#         int currentPage = Integer.valueOf(request.getParameter("currentPage"));  
#   
#         List list = (List)request.getSession().getAttribute("list");  
#           
#         int totalCount = list.size();  
#   
#         List pageList = new ArrayList();  
#           
#         if(pageSize >= totalCount)  
#         {  
#             pageList = list;  
#         }else if((pageSize > 0)&&(pageSize < totalCount))  
#         {  
#             if(1 == currentPage)  
#             {  
#                 pageList = getPageList(list, 0, pageSize);  
#             }else if(1 < currentPage){  
#                   
#                 pageList = (currentPage * pageSize > totalCount)?  
#                         getPageList(list, (currentPage - 1) * pageSize, totalCount)  
#                         :getPageList(list, (currentPage - 1) * pageSize, currentPage * pageSize);  
#             }  
#         }  
#   
#         ModelAndView modelAndView = getModelAndView();  
#         modelAndView.addObject("pageList", pageList);  
#         return modelAndView;  
#     }  
#   
#     @SuppressWarnings("unchecked")  
#     private List getPageList(List list, int startIndex, int endIndex)  
#     {  
#         return list.subList(startIndex, endIndex);  
#     }  
#   
#     public ModelAndView getModelAndView()  
#     {  
#         return modelAndView;  
#     }  
#   
# }

由于考虑到共用性，该controller中的List没有指明具体的类型。

下面建立个简单的JavaBean，用于测试

接口类Person.java

实现类PersonImpl.java

Person.java 内容如下：

   1. package com.kt.entity;  
   2.   
   3. public interface Person  
   4. {  
   5.     public abstract String getUserName();  
   6.   
   7.     public abstract void setUserName(String userName);  
   8.   
   9.     public abstract int getAge();  
  10.   
  11.     public abstract void setAge(int age);  
  12. }  

PersonImpl.java 内容如下：

# package com.kt.entity.impl;  
#   
# import com.kt.entity.Person;  
#   
# public class PersonImpl implements Person  
# {  
#     private String userName;  
#   
#     private int age;  
#   
#     public String getUserName()  
#     {  
#         return userName;  
#     }  
#   
#     public void setUserName(String userName)  
#     {  
#         this.userName = userName;  
#     }  
#   
#     public int getAge()  
#     {  
#         return age;  
#     }  
#   
#     public void setAge(int age)  
#     {  
#         this.age = age;  
#     }  
# }

下面是页面代码

test.jsp

# <%@ page language="java" contentType="text/html; charset=UTF-8"  
#     pageEncoding="UTF-8" isELIgnored="false"%>  
# <%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>  
# <%@taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt"%>  
# <%@taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn"%>  
# <%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>  
# <%@taglib uri="/WEB-INF/tagLib.tld" prefix="aaa" %>  
#   
#   
# <html>  
# <head>  
# <title>Hotel List</title>  
# <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">  
# <mce:script type="text/javascript" src="../js/prototype.js" mce_src="js/prototype.js"></mce:script>  
# </head>  
# <body>  
#   <table>  
#       <tr>  
#           <td>姓名</td>  
#           <td>年龄</td>  
#       </tr>  
#       <tbody id="dataShow">  
#        <c:forEach  items="${pageList}" var="person" varStatus="status">  
#         <tr>  
#           <td>${person.userName}</td>  
#           <td>${person.age}</td>  
#         </tr>  
#       </c:forEach>  
#       </tbody>  
#   </table>  
# <div style="width: 500px; float: left;">  
# <aaa:showDataTag url="/ajaxPagination/test/paginationController.do" location="dataShow" list="${list}" pageSize="5"></aaa:showDataTag>  
# </div>  
# </body>  
# </html>

url：是Ajax要提交的controller映射 ''/ajaxPagination/test/paginationController.do"中，ajaxPagination为项目名称

location：返回页面要刷新的区域

list：用于分页的List

pageSize：每页显示的条数，该数值应与TestController.java中的pageSize数值相同

注意：在test.jap页面中不要忘记把prototype.js文件放进去

test_1.jsp

# <%@ page language="java" contentType="text/html; charset=UTF-8"  
#     pageEncoding="UTF-8" isELIgnored="false"%>  
# <%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>  
# <%@taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt"%>  
# <%@taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn"%>  
# <%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>  
#   
# <c:forEach  items="${pageList}" var="person" varStatus="status">  
#         <tr>  
#           <td>${person.userName}</td>  
#           <td>${person.age}</td>  
#         </tr>  
# </c:forEach>