hibernate+struts2的详细分页代码

Dear 丶 2022-06-15 04:23 125阅读 0赞

hibernate+struts2做的分页：

首先导入jar包和配置struts.xml:

<package name="default" namespace="/Message" extends="struts-default">
       <action name="Message_*" class="action.MessageAction" method="{1}">
       <result name="list">/WEB-INF/jsp/message.jsp</result>
       <result name="input">/WEB-INF/jsp/error.jsp</result>
    </action>

核心：

第一步持久化层：

package domain;
    
    import java.util.Date;
    
    public class Message {
    	private int id;
    	private String title;
    	private String message;
    	private Date date;
    	private String ip;
    	public Message() {
    
    	}
    	public Message(String title, String message, Date date,String ip) {
    		super();
    		this.title = title;
    		this.message = message;
    		this.date = date;
    		this.ip=ip;
    	}
    	public int getId() {
    		return id;
    	}
    	public void setId(int id) {
    		this.id = id;
    	}
    	public Date getDate() {
    		return date;
    	}
    	public void setDate(Date date) {
    		this.date = date;
    	}
    	public String getTitle() {
    		return title;
    	}
    	public void setTitle(String title) {
    		this.title = title;
    	}
    	public String getMessage() {
    		return message;
    	}
    	public void setMessage(String message) {
    		this.message = message;
    	}
    	public String getIp() {
    		return ip;
    	}
    	public void setIp(String ip) {
    		this.ip = ip;
    	}
    	@Override
    	public String toString() {
    		return "Message [id=" + id + ", title=" + title + ", message=" + message
    				+ ", date=" + date + ", ip=" + ip + "]";
    	}
    
    }

<?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
    
    <hibernate-mapping>
        <class name="domain.Message" table="message">
            <id name="id" type="java.lang.Integer">
                <column name="id" />
                <generator class="native" />
            </id>
            <property name="title" type="java.lang.String">
                <column name="title" />
            </property>
            <property name="date" type="java.util.Date">
                <column name="date" length="10" />
            </property>
            <property name="message" type="java.lang.String">
                <column name="message" />
            </property>
            <property name="ip" type="java.lang.String">
                <column name="ip" />
            </property>
        </class>
    </hibernate-mapping>

第二步建立Dao：

package dao;
    
    
    import java.util.List;
    
    
    import org.hibernate.Query;
    import org.hibernate.Session;
    
    
    import com.cl.util.ServletUtil;
    import com.cl.util.SessionFactoryUtil;
    
    
    import domain.Message;
    
    
    public class MessageDao {
    	/*
    	 * 将查询的记录存入list,后面存入session中在jsp页面使用迭代器取出
    	 */
    	public List<Message> search(int curPage) {
    		if(curPage==0) curPage=1;
    		Session session=SessionFactoryUtil.getSession();
    		Query query=session.createQuery("from Message  order by id desc");
    		query.setFirstResult((curPage-1)*ServletUtil.pageSize);
    		query.setMaxResults(ServletUtil.pageSize);
    		return query.list();
    	}
    	/*
    	 * 信息量
    	 */
    	public Long TopicCounts() {
    		Session session=SessionFactoryUtil.getSession();
    		Query query=session.createQuery("select count(*) from Message ");
    		
    		return (Long) query.uniqueResult();
    	}
    }

第三步建立两个action：Message继承superACtion，superACtion继承actionSupport并实现一些接口：当然一个也可以只写一个类

package action;
    
    import javax.servlet.ServletContext;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import javax.servlet.http.HttpSession;
    
    import org.apache.struts2.ServletActionContext;
    import org.apache.struts2.interceptor.ServletRequestAware;
    import org.apache.struts2.interceptor.ServletResponseAware;
    import org.apache.struts2.util.ServletContextAware;
    
    import com.opensymphony.xwork2.ActionContext;
    import com.opensymphony.xwork2.ActionSupport;
    
    //所有action动作的父类
    public class SuperAction extends ActionSupport implements ServletRequestAware,
    		ServletResponseAware, ServletContextAware {
    	/**
    	 * 
    	 */
    	private static final long serialVersionUID = 1L;
    	protected HttpServletRequest request;// 请求对象
    	protected HttpServletResponse response;// 响应对象
    	protected HttpSession session;// 会话对象
    	protected ActionContext context;//动作对象
    
    	public void setServletContext(ServletContext context) {
    		this.context=ServletActionContext.getContext();
    	}
    
    	public void setServletResponse(HttpServletResponse response) {
    		this.response = response;
    
    	}
    
    	public void setServletRequest(HttpServletRequest request) {
    		this.request = request;
    		this.session = this.request.getSession();
    	}
    
    }

package action;
    
    import java.util.List;
    
    import com.cl.util.ServletUtil;
    import com.opensymphony.xwork2.ActionSupport;
    import com.opensymphony.xwork2.ModelDriven;
    
    import dao.MessageDao;
    import domain.Message;
    
    public class MessageAction extends SuperAction implements ModelDriven<Message> {
    
    	private MessageDao dao=new MessageDao();
    
    	private Message m=new Message();
    
    	private int curPage,totalPage;
    
    	public String list(){
    		List<Message> list=dao.search(curPage);
    		totalPage=(int) Math.ceil((double)dao.TopicCounts()/(double)ServletUtil.pageSize);
    		session.setAttribute("list", list);
    		session.setAttribute("curPage", curPage==0?1:curPage);
    		session.setAttribute("totalPage", totalPage==0?1:totalPage);
    		return "list";
    	}
    	
    	public MessageDao getDao() {
    		return dao;
    	}
    
    	public void setDao(MessageDao dao) {
    		this.dao = dao;
    	}
    
    	public int getCurPage() {
    		return curPage;
    	}
    
    	public void setCurPage(int curPage) {
    		this.curPage = curPage;
    	}
    	@Override
    	public Message getModel() {
    		// TODO Auto-generated method stub
    		return m;
    	}
    	
    }

最后ShowMessage.jsp：

<h1>显示留言</h1>
      
    	<table >
    		<tr><td>编号</td><td>标题</td><td>主机号</td><td>内容</td><td>时间</td></tr>
    
        		<s:iterator value="%{#session.list}" status="s" >
    	<tr><td >
    <s:property value="%{#s.index-5+#session.curPage*@com.cl.util.ServletUtil@pageSize}"/> 
    </td><td>
    <a href="#" ><s:property  value="title" /></a></td>
    <td><s:property  value="ip" /></td>
    <td ></td>
    <td><label > <s:property  value="message" /></label></td>
    <td><s:date  name="date" format="yyyy-MM-dd hh:mm:ss" /></td>
     </tr>
    	      </s:iterator>
    	</table>
    	<div >
    		<a href="${pageContext.request.contextPath}/Message/Message_list.action?curPage=1" >首页</a>
    		<a href="${pageContext.request.contextPath}/Message/Message_list.action?curPage=<s:property value="%{#session.curPage-1<0?1:#session.curPage-1}" />"   >上一页</a>
    		第 <font color="red"><s:property value="%{#session.curPage}"/></font> 页/共<font color="red"><s:property value="%{#session.totalPage}"/></font>页
    		<a href="${pageContext.request.contextPath}/Message/Message_list.action?curPage=<s:property value="%{#session.curPage+1>=#session.totalPage?#session.totalPage:#session.curPage+1}" />"   >下一页</a> 
    		<a href="${pageContext.request.contextPath}/Message/Message_list.action?curPage=<s:property  value="%{#session.totalPage}"/>" >尾页</a>
    	</div>

效果图:

![Center][]

[Center]: /images/20220615/3aea144b2c4d4b2d874d51a320fb3a88.png