Pager-taglib.jar(分页组件)

这套解决方案，是按照MVC的模式来做的，基于STRUTS框架。分为三个部分，表现层用的是JSP，其中用了JSTL和pager taglib 做分页；控制层就 是用的很传统的Action；底层就用的是Spring+Hibernate。下面分三个部分慢慢说：

说到分页：
1  首先新建一个PageModel类

 package    com.dengmin.oa.utils;

 import    java.util.List;

 public     class    PageModel {

      /**
      * 总 记录数
      */
      private     int    total;
      /**
      * 当 前页的记录集
      */
      private    List datas;

      public    List getDatas() {
          return    datas;
     }

      public     void    setDatas(List datas) {
          this   .datas = datas;
     }

      public     int    getTotal() {
          return    total;
     }

      public     void    setTotal( int    total) {
          this   .total = total;
     }
 }

 package    com.dengmin.oa.utils;

 import    java.util.List;

 public     class    PageModel {

      /**
      * 总 记录数
      */
      private     int    total;
      /**
      * 当 前页的记录集
      */
      private    List datas;

      public    List getDatas() {
          return    datas;
     }

      public     void    setDatas(List datas) {
          this   .datas = datas;
     }

      public     int    getTotal() {
          return    total;
     }

      public     void    setTotal( int    total) {
          this   .total = total;
     }
 }

 package  com.dengmin.oa.utils;

 import  java.util.List;

 public   class  PageModel {

     /**
      * 总 记录数
      */
     private   int  total;
     /**
      * 当 前页的记录集
      */
     private  List datas;

     public  List getDatas() {
         return  datas;
     }

     public   void  setDatas(List datas) {
         this .datas = datas;
     }

     public   int  getTotal() {
         return  total;
     }

     public   void  setTotal( int  total) {
         this .total = total;
     }
 }

package com.dengmin.oa.utils;

import java.util.List;

public class PageModel {

	/**
	 * 总记录数
	 */
	private int total;
	/**
	 * 当前页的记录集
	 */
	private List datas;

	public List getDatas() {
		return datas;
	}

	public void setDatas(List datas) {
		this.datas = datas;
	}

	public int getTotal() {
		return total;
	}

	public void setTotal(int total) {
		this.total = total;
	}
}

2  底层是基于Spring+Hibernate来做的。在DAO这一层，为其增加两个方法，底层的分页查询用的是Hibernate提供的分页查询。

 public     interface    UserDao {

      public     void    addUser(User user);

      /**
      *
      * @param offset  从 第几条记录开始查询
      * @param pagesize  每 页显示多少条记录
      * @return
      */
      public    PageModel findAllUser( int    offset,  int    pagesize);
 }

 public     interface    UserDao {

      public     void    addUser(User user);

      /**
      *
      * @param offset  从 第几条记录开始查询
      * @param pagesize  每 页显示多少条记录
      * @return
      */
      public    PageModel findAllUser( int    offset,  int    pagesize);
 }

 public   interface  UserDao {

     public   void  addUser(User user);

     /**
      *
      * @param offset  从第几条记录开始查询
      * @param pagesize  每页显示多少条记录
      * @return
      */
     public  PageModel findAllUser( int  offset,  int  pagesize);
 }

public interface UserDao {

	public void addUser(User user);

	/**
	 * 
	 * @param offset  从第几条记录开始查询
	 * @param pagesize  每页显示多少条记录
	 * @return
	 */
	public PageModel findAllUser(int offset, int pagesize);
}

3  UserDao的实现类

 public     class    UserDaoImpl  extends    HibernateDaoSupport  implements    UserDao {

      public     void    addUser(User user) {
          this   .getHibernateTemplate().save(user);
     }

      public    PageModel findAllUser( int    offset,  int    pagesize) {

          //得到总记录数
         String queryCountHql =  "select count(*) from User"  ;

         Query query = getSession().createQuery(queryCountHql);
          int    total = ((Long)query.uniqueResult()).intValue();

         List datas = getSession().createQuery( "from User"  )
                     .setFirstResult(offset)
                     .setMaxResults(pagesize)
                     .list();
          //得到结果集
         PageModel pm =  new    PageModel();
         pm.setTotal(total);
         pm.setDatas(datas);

          return    pm;
     }

 }

 public     class    UserDaoImpl  extends    HibernateDaoSupport  implements    UserDao {

      public     void    addUser(User user) {
          this   .getHibernateTemplate().save(user);
     }

      public    PageModel findAllUser( int    offset,  int    pagesize) {

          //得到总记录数
         String queryCountHql =  "select count(*) from User"  ;

         Query query = getSession().createQuery(queryCountHql);
          int    total = ((Long)query.uniqueResult()).intValue();

         List datas = getSession().createQuery( "from User"  )
                     .setFirstResult(offset)
                     .setMaxResults(pagesize)
                     .list();
          //得到结果集
         PageModel pm =  new    PageModel();
         pm.setTotal(total);
         pm.setDatas(datas);

          return    pm;
     }

 }

 public   class  UserDaoImpl  extends  HibernateDaoSupport  implements  UserDao {

     public   void  addUser(User user) {
         this .getHibernateTemplate().save(user);
     }

     public  PageModel findAllUser( int  offset,  int  pagesize) {

         //得到总记录数
         String queryCountHql = "select count(*) from User" ;

         Query query = getSession().createQuery(queryCountHql);
         int  total = ((Long)query.uniqueResult()).intValue();

         List datas = getSession().createQuery("from User" )
                     .setFirstResult(offset)
                     .setMaxResults(pagesize)
                     .list();
         //得到结果集
         PageModel pm = new  PageModel();
         pm.setTotal(total);
         pm.setDatas(datas);

         return  pm;
     }

 }

public class UserDaoImpl extends HibernateDaoSupport implements UserDao {

	public void addUser(User user) {
		this.getHibernateTemplate().save(user);
	}
	
	public PageModel findAllUser(int offset, int pagesize) {
		
		//得到总记录数
		String queryCountHql = "select count(*) from User";
		
		Query query = getSession().createQuery(queryCountHql);
		int total = ((Long)query.uniqueResult()).intValue();
		
		List datas = getSession().createQuery("from User")
					.setFirstResult(offset)
					.setMaxResults(pagesize)
					.list();
		//得到结果集
		PageModel pm = new PageModel();
		pm.setTotal(total);
		pm.setDatas(datas);
		
		return pm;
	}

}

ok!底层的实现工作就做好了

在控制层中UserAction从DispatchAction继承重写它的 unspecified方法
通过spring注入UserDao 代码如下：

 public     class    UserAction  extends    DispatchAction {

      private    UserDao userDao;
      @Override
      protected    ActionForward unspecified(ActionMapping mapping, ActionForm form,
             HttpServletRequest request, HttpServletResponse response)  throws    Exception {

          int    offset =  0  ;

          try    {
             offset = Integer.parseInt(request.getParameter( "pager .offset"  ));
         }  catch    (Exception e) {
         }
          //这里我按照每页显示10条
         PageModel pm = userDao.findAllUser(offset,  10  );
         request.setAttribute( "pm"  , pm);

          return    mapping.findForward( "success"  );
     }

      public     void    setUserDao(UserDao userDao) {
          this   .userDao = userDao;
     }

 }

 public     class    UserAction  extends    DispatchAction {

      private    UserDao userDao;
      @Override
      protected    ActionForward unspecified(ActionMapping mapping, ActionForm form,
             HttpServletRequest request, HttpServletResponse response)  throws    Exception {

          int    offset =  0  ;

          try    {
             offset = Integer.parseInt(request.getParameter( "pager .offset"  ));
         }  catch    (Exception e) {
         }
          //这里我按照每页显示10条
         PageModel pm = userDao.findAllUser(offset,  10  );
         request.setAttribute( "pm"  , pm);

          return    mapping.findForward( "success"  );
     }

      public     void    setUserDao(UserDao userDao) {
          this   .userDao = userDao;
     }

 }

 public   class  UserAction  extends  DispatchAction {

     private  UserDao userDao;
     @Override
     protected  ActionForward unspecified(ActionMapping mapping, ActionForm form,
             HttpServletRequest request, HttpServletResponse response) throws  Exception {

         int  offset =  0 ;

         try  {
             offset = Integer.parseInt(request.getParameter("pager .offset" ));
         } catch  (Exception e) {
         }
         //这里我按照每页显示10条
         PageModel pm = userDao.findAllUser(offset, 10 );
         request.setAttribute("pm" , pm);

         return  mapping.findForward( "success" );
     }

     public   void  setUserDao(UserDao userDao) {
         this .userDao = userDao;
     }

 }

public class UserAction extends DispatchAction {

	private UserDao userDao;
	@Override
	protected ActionForward unspecified(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response) throws Exception {
		
		int offset = 0; 
		
		try {
			offset = Integer.parseInt(request.getParameter("pager
.offset"));
		} catch (Exception e) {
		}
		//这里我按照每页显示10条
		PageModel pm = userDao.findAllUser(offset, 10);
		request.setAttribute("pm", pm);
		
		return mapping.findForward("success");
	}
	
	public void setUserDao(UserDao userDao) {
		this.userDao = userDao;
	}
	
}

spring中的配置如下

 <!-- 配置sessionFactory -->
     <bean id= "sessionFactory"
          class   = "org.springframework.orm.hibernate3.LocalSessionFactoryBean"  >
         <property name= "configLocation"  >
             <value>classpath:hibernate.cfg.xml</value>
         </property>
     </bean>
     <!-- 配置事务管理器 -->
     <bean id= "transactionManager"
          class   = "org.springframework.orm.hibernate3.HibernateTransactionManager"  >
         <property name= "sessionFactory"  >
             <ref bean= "sessionFactory"   />
         </property>
     </bean>

     <!-- 配置事务的传播特性 -->
     <tx:advice id= "txAdvice"   transaction-manager= "transactionManager"  >
         <tx:attributes>
             <tx:method name= "*"   propagation= "REQUIRED"   />
         </tx:attributes>
     </tx:advice>


 <bean id= "userDao"    class   = "com.dengmin.pager .dao.UserDaoImpl"  >
         <property name= "sessionFactory"   ref= "sessionFactory"   />
     </bean>

     <bean name= "/userManager"
          class   = "com.dengmin.pager .actions.UserAction"   scope= "prototype"  >
         <property name= "userDao"   ref= "userDao"   />
     </bean>

 <!-- 配置sessionFactory -->
     <bean id= "sessionFactory"
          class   = "org.springframework.orm.hibernate3.LocalSessionFactoryBean"  >
         <property name= "configLocation"  >
             <value>classpath:hibernate.cfg.xml</value>
         </property>
     </bean>
     <!-- 配置事务管理器 -->
     <bean id= "transactionManager"
          class   = "org.springframework.orm.hibernate3.HibernateTransactionManager"  >
         <property name= "sessionFactory"  >
             <ref bean= "sessionFactory"   />
         </property>
     </bean>

     <!-- 配置事务的传播特性 -->
     <tx:advice id= "txAdvice"   transaction-manager= "transactionManager"  >
         <tx:attributes>
             <tx:method name= "*"   propagation= "REQUIRED"   />
         </tx:attributes>
     </tx:advice>


 <bean id= "userDao"    class   = "com.dengmin.pager .dao.UserDaoImpl"  >
         <property name= "sessionFactory"   ref= "sessionFactory"   />
     </bean>

     <bean name= "/userManager"
          class   = "com.dengmin.pager .actions.UserAction"   scope= "prototype"  >
         <property name= "userDao"   ref= "userDao"   />
     </bean>

 <!-- 配 置sessionFactory -->
     <bean id="sessionFactory"
         class = "org.springframework.orm.hibernate3.LocalSessionFactoryBean" >
         <property name="configLocation" >
             <value>classpath:hibernate.cfg.xml</value>
         </property>
     </bean>
     <!-- 配 置事务管理器 -->
     <bean id="transactionManager"
         class = "org.springframework.orm.hibernate3.HibernateTransactionManager" >
         <property name="sessionFactory" >
             <ref bean="sessionFactory"  />
         </property>
     </bean>

     <!-- 配 置事务的传播特性 -->
     <tx:advice id="txAdvice"  transaction-manager= "transactionManager" >
         <tx:attributes>
             <tx:method name="*"  propagation= "REQUIRED"  />
         </tx:attributes>
     </tx:advice>


 <bean id="userDao"   class = "com.dengmin.pager .dao.UserDaoImpl" >
         <property name="sessionFactory"  ref= "sessionFactory"  />
     </bean>

     <bean name="/userManager"
         class = "com.dengmin.pager .actions.UserAction"  scope= "prototype" >
         <property name="userDao"  ref= "userDao"  />
     </bean>

<!-- 配置sessionFactory -->
	<bean id="sessionFactory"
		class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
		<property name="configLocation">
			<value>classpath:hibernate.cfg.xml</value>
		</property>
	</bean>
	<!-- 配置事务管理器 -->
	<bean id="transactionManager"
		class="org.springframework.orm.hibernate3.HibernateTransactionManager">
		<property name="sessionFactory">
			<ref bean="sessionFactory" />
		</property>
	</bean>

	<!-- 配置事务的传播特性 -->
	<tx:advice id="txAdvice" transaction-manager="transactionManager">
		<tx:attributes>
			<tx:method name="*" propagation="REQUIRED" />
		</tx:attributes>
	</tx:advice>


<bean id="userDao" class="com.dengmin.pager
.dao.UserDaoImpl">
		<property name="sessionFactory" ref="sessionFactory" />
	</bean>

	<bean name="/userManager"
		class="com.dengmin.pager
.actions.UserAction" scope="prototype">
		<property name="userDao" ref="userDao" />
	</bean>

最后是jsp页面做数据显示
这里采用了jstl和pager -taglib 的 标签库
首先将其引入：

 <%@ taglib  prefix= "c"    uri= "http://java.sun.com/jsp/jstl/core"   %>
 <%@ taglib  prefix= "pg"   uri= "http://jsptags.com/tags/navigation/pager "   %>

 <%@ taglib  prefix= "c"    uri= "http://java.sun.com/jsp/jstl/core"   %>
 <%@ taglib  prefix= "pg"   uri= "http://jsptags.com/tags/navigation/pager "   %>

 <%@ taglib  prefix= "c"   uri= "http://java.sun.com/jsp/jstl/core"  %>
 <%@ taglib  prefix="pg"  uri= "http://jsptags.com/tags/navigation/pager "  %>

<%@ taglib
 prefix="c"  uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib
 prefix="pg" uri="http://jsptags.com/tags/navigation/pager
" %>

 

    < body >
      < h1 >   User Manager </ h1 >
      < hr />

      < table     width  = "778"    border  = "0"    cellPadding  = "0"    cellSpacing  = "1"    bgcolor  = "#6386d6"  >
      < tr     bgcolor  = "#EFF3F7"  >
          < TD     align  = "center"  >   ID </ TD >
          < TD     align  = "center"  >   名 称 </ TD >
          < TD

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displaytag分页标签 | pager-taglib 2.0.jar

• 2010-03-30 17:50
• 浏览 644
• 评论(0)
• 分类:编程语言
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