java分页应用的一个留言板。用struts2标签库写的页面。

?前段时间为了练习想做个博客，结果博客的本事我没有，就做了个留言板。

效果就像这样了。

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struts2和hibernate用上了。

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贴一下分页组件和留言页面的代码吧。

分页组件

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package com.leaves.util;import java.util.List;/** * 用来进行分页实现的javaBean组件 *  * @author leaves *  */public class PageModel {    private int currPage; // 当前页    private int totalRecords; // 总记录数    private List<?> list; // 结果集    private int pageSize; // 每页记录数    public int getCurrPage() {return currPage;    }    public void setCurrPage(int currPage) {this.currPage = currPage;    }    public int getTotalRecords() {return totalRecords;    }    public void setTotalRecords(int totalRecords) {this.totalRecords = totalRecords;    }    public List<?> getList() {return list;    }    public void setList(List<?> list) {this.list = list;    }    public int getPageSize() {return pageSize;    }    public void setPageSize(int pageSize) {this.pageSize = pageSize;    }    /**     * 获取第一页     *      * @return     */    public int getFirstPage() {return 1;    }    /**     * 获取最后一页（即最后一页）     *      * @return     */    public int getLastPage() {return (totalRecords + pageSize - 1) / pageSize;    }    /**     * 获取下一页     *      * @return     */    public int getNextPage() {return (currPage >= getLastPage()) ? getLastPage() : (currPage + 1);    }    /**     * 获取前一页     *      * @return     */    public int getPreviousPage() {return currPage <= 1 ? currPage : (currPage - 1);    }    @Override    public String toString() {return "PageModel:[currPage:" + getCurrPage() + ",pageSize:" + getPageSize() + ",listSize:" + getList().size()+ "]";    }}

?处理查看和保存的action

package com.leaves.action;import java.util.ArrayList;import java.util.Date;import java.util.List;import com.leaves.dao.LeaveWordDaoImpl;import com.leaves.dao.UserDaoImpl;import com.leaves.dao.WordDaoImpl;import com.leaves.model.LeaveWord;import com.leaves.util.PageModel;import com.opensymphony.xwork2.ActionContext;import com.opensymphony.xwork2.ActionSupport;public class LeaveWordActiong extends ActionSupport {    private LeaveWord word;    private String tip;    private PageModel pageModel;// 用来进行查询操作的分页模型    private List<Integer> pageList;    public List<Integer> getPageList() {        return pageList;    }    public void setPageList(List<Integer> pageList) {        this.pageList = pageList;    }    public PageModel getPageModel() {return pageModel;    }    public void setPageModel(PageModel pageModel) {this.pageModel = pageModel;    }    public String getTip() {return tip;    }    public void setTip(String tip) {this.tip = tip;    }    public LeaveWord getWord() {return word;    }    public void setWord(LeaveWord word) {this.word = word;    }    // 处理用户保存留言    public String saveWord() throws Exception {String username = (String) ActionContext.getContext().getSession().get("user");// 如果用户没有登陆 ，直接返回错误信息if (username == null) {    setTip(getText("saveWordWrong.noUser"));    return INPUT;}if (word.getWordContent() != null && !word.getWordContent().isEmpty()) {    word.setLeaveTime(new Date());    word.setWordAuthor(new UserDaoImpl().getUser(username));    new WordDaoImpl().saveWord(word);    // 防止乱码，用国际化索引来指定提示信息。    // 此处发现国际化可以防止直接传输中XML和servlet页面之间产生乱码的问题。    setTip("saveSuccMsg");    return SUCCESS;}return INPUT;    }    // 处理查看所有留言    public String wordView() throws Exception {if (pageModel == null) {    System.out.println("分页模型为空，创建新模型");    pageModel = new PageModel();}// 做初始化工作，防止第一次访问出错if (pageModel.getCurrPage() == 0) {    System.out.println("当前页为0，设置为1");    pageModel.setCurrPage(1); // 设置默认页面当前页面为1.方便第一次访问页面}if (pageModel.getPageSize() == 0) {    System.out.println("当前页条数为0设置为5");    pageModel.setPageSize(5);// 设置每页显示的记录条数。默认为5条}// 把从页面传参后得到的PageModel传入到getSubWord方法中来获取一个得到结果集的PageModelpageModel = new LeaveWordDaoImpl().getSubWord(getPageModel());if (pageList==null||pageList.get(pageList.size()-1)!=pageModel.getLastPage()) {    pageList=new ArrayList<Integer>();    for (int i = 1; i <= pageModel.getLastPage(); i++) { pageList.add(i);    }}//根据当前页码和每页数量获得一个分页模型setPageModel(pageModel);// 根据传送进来的国际化索引来设置提示信息。setTip(getText(getTip()));return SUCCESS;    }}

?留言处理的impl

package com.leaves.dao;import java.util.List;import org.hibernate.Query;import org.hibernate.Session;import com.leaves.model.LeaveWord;import com.leaves.util.HibernateUtil;import com.leaves.util.PageModel;/** * 此类实现LeaveWordDao，实现具体对 LeaveWord进行操作的方法 *  * @author leaves *  */public class LeaveWordDaoImpl implements LeaveWordDao {@Overridepublic void saveWord(LeaveWord leaveWord) {    Session session = HibernateUtil.getSession();    try {session.beginTransaction();// 此处不允许用户修改留言，直接只用save方法session.save(leaveWord);session.getTransaction().commit();    } catch (Exception e) {e.printStackTrace();session.getTransaction().rollback();    }finally{HibernateUtil.closeSession();    }}@Overridepublic void deleteWord(Integer wordid) {}@SuppressWarnings("unchecked")@Overridepublic List<LeaveWord> getWords() {    Session session = HibernateUtil.getSession();    List<LeaveWord> words = null;    try {session.beginTransaction();// 在事务中间进行查询处理String hql = new String("from LeaveWord l order by l.wordId asc");words = session.createQuery(hql).list();session.getTransaction().commit();    }  catch (Exception e) {e.printStackTrace();session.getTransaction().rollback();    }finally{HibernateUtil.closeSession();    }return words;}@SuppressWarnings("unchecked")@Overridepublic PageModel getSubWord(PageModel pageModel) {    Session session=HibernateUtil.getSession();    List<LeaveWord> words = null;    session.beginTransaction();    try {// 在事务中间进行查询处理String hql = new String("from LeaveWord as l order by wordId asc");// 进行HQL分页查询Query query = session.createQuery(hql);// 设置起始位置query.setFirstResult((pageModel.getCurrPage() - 1) * pageModel.getPageSize());// 设置总记录条数query.setMaxResults(pageModel.getPageSize());// 获取结果words = query.list();// 获取数据库总记录数int totalRecords = this.getTotalRecords(session);if (totalRecords >= 1) {// 设置总记录数pageModel.setTotalRecords(totalRecords);// 设置记录集合pageModel.setList(words);}session.getTransaction().commit();//----------------------------------------------------    }  catch (Exception e) {e.printStackTrace();session.getTransaction().rollback();    }finally{//HibernateUtil.closeSession();    }return pageModel;}/** * 获取总记录数的方法 *  * @param session * @return */public int getTotalRecords(Session session) {String hql = "select count(*) from LeaveWord";Long longResult = (Long) session.createQuery(hql).uniqueResult();return longResult.intValue();}}

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现实留言页面

<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%><%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%><%@taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt"%><%@taglib uri="/struts-tags" prefix="s"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>allWords</title><script type="text/javascript">function submitByPage(currPage){document.getElementById("pageModel.currPage").value=currPage;theForm=document.getElementById("getWords");theForm.action="wordView";theForm.submit();}function submitBySize(){document.getElementById("pageModel.pageSize").value=document.getElementById("pageModel.pageSize").value;theForm=document.getElementById("getWords");theForm.action="wordView";theForm.submit();}</script></head><body><h1><s:i18n name="pageI18N.leavesWords"><s:text name="h1.allWordMsg"/></s:i18n></h1><s:set value="pageModel.list" name="wordList" /><table border="1" width=100% align="center"><s:iterator value="wordList" var="oneWord" status="st"><tr><td colspan="2"><!-- 输出留言内容 --><s:property value="#oneWord.wordContent" /></td></tr><tr bgcolor="#c8eb50" align="right"><td><!-- 输出楼层 --><s:text name="view.floorNum"><s:param><font color=red><s:property value="#st.count"/></font></s:param></s:text><!-- 输出作者 --><s:text name="view.author"><s:param><font color=blue><s:property value="#oneWord.wordAuthor.username"/></font></s:param></s:text><!-- 输出时间 --><s:text name="view.leaveTime"><s:param><font color=green><s:date name="#oneWord.leaveTime" format="yyyy-MM-dd hh:mm:ss"/></font></s:param></s:text></td></tr></s:iterator></table><div><s:i18n name="pageI18N.leavesWords"><form  id="getWords"><s:token/><s:text name="page.goto"><s:param><!-- 此处暂未实现下拉选择页码 --><s:select id="pageModel.currPage"  value="pageModel.currPage" onchange="submitByPage(this.value);" list="pageList" name="pageModel.currPage"></s:select></s:param></s:text><!-- 页码控制--><a href="#" onclick="submitByPage(${pageModel.firstPage});"><s:text name="page.first"/></a><a href="#" onclick="submitByPage(${pageModel.previousPage});"><s:text name="page.previous"/></a><a href="#" onclick="submitByPage(${pageModel.nextPage});"><s:text name="page.next"/></a><a href="#" onclick="submitByPage(${pageModel.lastPage});"><s:text name="page.last"/></a><s:text name="results.OnePage"><s:param><s:select id="pageModel.pageSize" onchange="submitBySize();"  list="{1,2,3,4,5,6,7,8,9}" name="pageModel.pageSize" value="pageModel.pageSize"/></s:param></s:text></form></s:i18n></div><jsp:include page="leaveWord.jsp"></jsp:include></body></html>

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lib包

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发上源码(只有src&WebContent，用的是eclipse for ee )

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