JDOM使用实例--外星人是否存在的调查

/**********************************************Author:Java619*Time:2007-02-14**********************************************/

这边以一个实例介绍下,JDOM(这边使用Jdom-b9)的用法,以及中文问题的解决方法. 

实例使用JSP作为视图,结合使用AJAX(用到prototype-1.4),Servlet和JavaBean作为后台处理

1.应用目录结构如下:

data  |--comment.xmljs  |--prototype.js  |--ufo.jscss  |--ufo.cssimages  |--loading.gifufo.jspWEB-INF  |-lib     |-jaxen-core.jar     |-jaxen-jdom.jar     |-jdom.jar     |-sax.jar     |-saxpath.jar  |-classes     ...  |-web.xml

2.后台JavaBean  CommentBean.java

/** */ /** * <P>外星人是否存在评论系统</p> * @author ceun * 联系作者:<br> *    <a href="mailto:ceun@163.com">ceun</a><br> * @version 1.0 2007-01-30 实现基本功能<br> * CommentBean.java * Created on Jan 30, 2007 9:39:19 AM */ package  com.ceun.bean; import  java.io.FileWriter; import  java.io.IOException; import  java.text.SimpleDateFormat; import  java.util.ArrayList; import  java.util.Date; import  java.util.List; import  java.util.Random; import  org.jdom.CDATA; import  org.jdom.Document; import  org.jdom.Element; import  org.jdom.JDOMException; import  org.jdom.Text; import  org.jdom.input.SAXBuilder; import  org.jdom.output.XMLOutputter; /** */ /** *<p> 封装对XML的操作</p> * @author ceun * 联系作者:<br> *    <a href="mailto:ceun@163.com">ceun</a><br> * @version 1.0 2007-01-30 实现基本功能<br> */ public   class  CommentBean  ... {    private String filepath;    private SAXBuilder builder = null;    private Document doc = null;    public CommentBean() ...{    }/** *//** * 初始化XML文件路径,加载文件 * */    public CommentBean(String path) ...{        this.filepath = path;        builder = new SAXBuilder();        try ...{            doc = builder.build(filepath);        } catch (JDOMException e) ...{            System.out.print("找不到指定的XML文件");            e.printStackTrace();        } catch (IOException e) ...{            System.out.print("找不到指定的文件");            e.printStackTrace();        }    } /** *//**  * 添加评论  * @param nikename 评论者昵称  * @param comment 评论内容  * @param attitude 评论者的结论(yes-存在,no-不存在)  * */    public String addComment(String nikename, String comment, String attitude) ...{        Element root = doc.getRootElement();        Element el = new Element("comment");        Random rand = new Random();        int id = rand.nextInt(10000);        el.setAttribute("id", "comment_" + id);        el.setAttribute("attitude", attitude);        Element name = new Element("nikename");        CDATA cname = new CDATA(nikename);        name.addContent(cname);        Element data = new Element("data");        CDATA ctext = new CDATA(comment);        data.addContent(ctext);        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");        Date date = new Date();        Text tdate = new Text(format.format(date));        Element pubdate = new Element("pubdate");        pubdate.addContent(tdate);        el.addContent(name);        el.addContent(data);        el.addContent(pubdate);        root.addContent(el);        XMLOutputter outputter = new XMLOutputter("  ", true, "GB2312");        // 清除comment元素间的空格        outputter.setTrimAllWhite(true);        try ...{            outputter.output(doc, new FileWriter(filepath));        } catch (IOException e) ...{            System.out.println("指定路径有错");            e.printStackTrace();        }        return tdate.getText();    }/** *//** * 删除指定ID的评论 * @param commentId 评论ID * @return 返回操作结果字符串(成功或失败) * */    public String removeComment(String commentId) ...{        Element root = doc.getRootElement();        List comments = root.getChildren();        int size = comments.size();        Element dist = null;        for (int i = 0; i < size; i++) ...{            Element comment = (Element) comments.get(i);            String id = comment.getAttributeValue("id");            if (id.equals(commentId)) ...{                dist = comment;                break;            }        }        if (dist != null) ...{            root.removeContent(dist);            XMLOutputter outputter = new XMLOutputter("  ", true, "GB2312");            // 清除comment元素间的空格            outputter.setTrimAllWhite(true);            try ...{                outputter.output(doc, new FileWriter(filepath));            } catch (IOException e) ...{                System.out.println("重写文件有出错");                e.printStackTrace();            }            return "成功删除指定元素!";        } else            return "指定元素不存在!";    }/** *//** * 批量删除评论 * @param commentIdArgs 评论ID数组 * @return 返回操作结果字符串(成功或失败) * */    public String removeComments(String[] commentIdArgs) ...{        Element root = doc.getRootElement();        List comments = root.getChildren();        int size = comments.size();        int len = commentIdArgs.length;        List<Element> dist = new ArrayList<Element>();        outer:for (int i = 0; i < size; i++) ...{            Element comment = (Element) comments.get(i);            String id = comment.getAttributeValue("id");            for (int j = 0; j < len; j++)                if (id.equals(commentIdArgs[j])) ...{                    dist.add(comment);                    continue outer;                }        }        int dist_size=dist.size();        if (dist_size != 0) ...{            for (int i = 0; i < dist_size; i++)                root.removeContent(dist.get(i));            XMLOutputter outputter = new XMLOutputter("  ", true, "GB2312");            // 清除comment元素间的空格            outputter.setTrimAllWhite(true);            try ...{                outputter.output(doc, new FileWriter(filepath));            } catch (IOException e) ...{                System.out.println("重写文件有出错");                e.printStackTrace();            }            return "成功删除指定的元素集合!";        } else            return "指定元素集合的不存在!";    }    /** *//**     * @return the filepath     */    public String getFilepath() ...{        return filepath;    }    /** *//**     * @param filepath     *            the filepath to set     */    public void setFilepath(String filepath) ...{        this.filepath = filepath;    }    /** *//**     * @return the builder     */    public SAXBuilder getBuilder() ...{        return builder;    }    /** *//**     * @param builder     *            the builder to set     */    public void setBuilder(SAXBuilder builder) ...{        this.builder = builder;    }}

3.处理AJAX请求的Servlet  AddCommentServlet.java

package  com.ceun.servlet; import  java.io.IOException; import  java.io.PrintWriter; import  javax.servlet.ServletException; import  javax.servlet.http.HttpServlet; import  javax.servlet.http.HttpServletRequest; import  javax.servlet.http.HttpServletResponse; import  com.ceun.bean.CommentBean; /** */ /** * <p>后台处理Servlet</p> *2007-01-30 * * @author ceun * 联系作者:<br> *    <a href="mailto:ceun@163.com">ceun</a><br> * @version 1.0 2007-01-30 实现基本功能<br> * */ public   class  AddCommentServlet  extends  HttpServlet  ... {    /** *//**     * serialVersionUID long     */    private static final long serialVersionUID = 1L;    /** *//**     * The doGet method of the servlet. <br>     *      * This method is called when a form has its tag value method equals to get.     *      * @param request     *            the request send by the client to the server     * @param response     *            the response send by the server to the client     * @throws ServletException     *             if an error occurred     * @throws IOException     *             if an error occurred     */    public void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException ...{        request.setCharacterEncoding("UTF-8");        response.setContentType("text/html;charset=UTF-8");        response.setHeader("Cache-Control", "no-cache");            PrintWriter out = response.getWriter();        String nikename = request.getParameter("nn");            String comment = request.getParameter("rsn");        String attitude = request.getParameter("atti");        String filepath = request.getSession().getServletContext().getRealPath(                "data/comment.xml");        CommentBean bean = new CommentBean(filepath);        String str = bean.addComment(nikename, comment, attitude);        out.println(str);    }    /** *//**     * The doPost method of the servlet. <br>     *      * This method is called when a form has its tag value method equals to     * post.     *      * @param request     *            the request send by the client to the server     * @param response     *            the response send by the server to the client     * @throws ServletException     *             if an error occurred     * @throws IOException     *             if an error occurred     */    public void doPost(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException ...{        doGet(request, response);    }}

4.JSP视图 ufo.jsp

<% ... @ page contentType="text/html;charset=UTF-8" %> <% ...     String path = request.getContextPath();    String basePath = request.getScheme() + "://"            + request.getServerName() + ":" + request.getServerPort()            + path + "/"; %> <! DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" > < html  xmlns ="http://www.w3.org/1999/xhtml"  xml:lang ="zh_CN"  lang ="zh_CN" >      < head >          < meta  http-equiv ="Content-Type"  content ="text/html; charset=UTF-8"   />          < meta  http-equiv ="pragma"  content ="no-cache"   />          < meta  http-equiv ="cache-control"  content ="no-cache"   />          < meta  http-equiv ="expires"  content ="0"   />          < title > ufo </ title >          < link  rel ="stylesheet"  type ="text/css"  href ="css/ufo.css" />          < script  src ="<%=basePath%>js/prototype.js"  type ="text/javascript" ></ script >          < script  src ="<%=basePath%>js/ufo.js"  type ="text/javascript" ></ script >      </ head >      < SCRIPT  type ="text/javascript" > ... <!--window.onload=function()...{getComments("<%=basePath%>data/comment.xml");}//--> </ SCRIPT >      < body >          < div  id ="cinfoDiv"  style ="display:none;" >              < h2 >                 信息提示             </ h2 >              < p  id ="cinfomsg" >              </ p >          </ div >          < table  id ="process-indicator"             style ="display:none;z-index:100;width:300px;" >              < tr >                  < td >                      < img  src ="images/loading.gif"   />                      < p >                         正在处理中...                     </ p >                  </ td >              </ tr >          </ table >          < center >              < div  id ="comment-lists" >              </ div >              < div  id ="comment" >                  < div  style ="display:none;top:100px;left:200px;"  id ="locateDiv1" >                  </ div >                  < div  id ="comment-bar" >                     你认为外星人存在吗?                 </ div >                  < div  id ="comment-form" >                      < form  onsubmit ="return false;"  name ="cform" >                         昵称:                         < input  type ="text"  id ="nn"  name ="nn"   />                          < input  type ="radio"  id ="exist"  name ="exist"  value ="yes"   />                         存在                         < input  type ="radio"  id ="exist"  name ="exist"  value ="no"   />                         不存在                         < br  />                          < textarea  name ="reason"  style ="width: 480px;height:200px;"                             id ="reason" ></ textarea >                          < button  id ="btnsubmit"  class ="button"                             onclick ="addComment('<%=path%>/addCommentServlet');" >                             发表你的看法                         </ button >                          < input  type ="reset"  id ="btnreset"  class ="button"   />                      </ form >                  </ div >              </ div >          </ center >      </ body > </ html >

5.前台脚本 ufo.js

var  Browser  =   ... {} ;Browser.isMozilla  =  ( typeof  document.implementation  !=   " undefined " )  &&  ( typeof  document.implementation.createDocument  !=   " undefined " )  &&  ( typeof  HTMLDocument  !=   " undefined " );Browser.isIE  =  window.ActiveXObject  ?   true  :  false ;Browser.isFirefox  =  (navigator.userAgent.toLowerCase().indexOf( " firefox " )  !=   - 1 );Browser.isSafari  =  (navigator.userAgent.toLowerCase().indexOf( " safari " )  !=   - 1 );Browser.isOpera  =  (navigator.userAgent.toLowerCase().indexOf( " opera " )  !=   - 1 );String.prototype.trim = function () ... {return this.replace(/^s+|s+$/g,"");} ; function  addComment(url) ... {var nn=$F("nn");var rsn=$F("reason");var atti=false;var rbgroup=document.cform.elements["exist"];for(i=0;i<rbgroup.length;i++)...{  if(rbgroup[i].checked) ...{atti=rbgroup[i].value;break;};}var locateTop=$("locateDiv1").parentNode.offsetTop-50;var locateLeft=$("locateDiv1").parentNode.offsetLeft+150;var alertMsg="";if(!atti)  alertMsg+="<br/>请表明你的态度!";if(nn.trim()=="")  alertMsg+="<br/>昵称不能为空!"if(rsn.trim()=="")  alertMsg+="<br/>请写下你的理由!";var cinfomsg=$("cinfomsg");if(alertMsg!="")...{  cinfomsg.className="failure";  cinfomsg.innerHTML=alertMsg;  showDialog($("cinfoDiv"),locateTop,locateLeft);  return;}else...{  cinfomsg.className="success";  cinfomsg.innerHTML="正处理数据中...";  showDialog($("cinfoDiv"),locateTop,locateLeft);}var pars="nn="+nn+"&atti="+atti+"&rsn="+rsn;var http=Ajax.getTransport();var contentType = "application/x-www-form-urlencoded; charset=utf-8";http.open("POST",url,true);http.setRequestHeader("Content-Type", contentType);http.onreadystatechange=function()...{     if (http.readyState == 4)...{      if (http.status==200)...{         afterAdd(http);       }     }  }http.send(pars);} function  afterAdd(request) ... {hideDialog();var atti=false;var rbgroup=document.cform.elements["exist"];for(i=0;i<rbgroup.length;i++)...{  if(rbgroup[i].checked) ...{atti=rbgroup[i].value;break;};}var nn=$F("nn");var rsn=$F("reason");generateCommentList(atti,nn,request.responseText,rsn)$("nn").value="";$("reason").value="";} function  generateCommentList(atti,nn,date,rsn) ... {var commentLists=$("comment-lists");var commentlist=document.createElement("div");commentlist.className="comment-list";var observerInfo=document.createElement("div");observerInfo.className="observer-info";var attitude=(atti=="yes")?"认为存在":"认为不存在";var info=document.createTextNode("评论者:"+nn+" 观点:"+attitude+" "+date);observerInfo.appendChild(info);var observerComment=document.createElement("div");observerComment.className="observer-comment";var reason=document.createTextNode(rsn);observerComment.appendChild(reason);commentlist.appendChild(observerInfo);commentlist.appendChild(observerComment);if(commentLists.hasChildNodes())...{  var tmp=commentLists.firstChild;  commentLists.insertBefore(commentlist,tmp);}else  commentLists.appendChild(commentlist);} function  getComments(url) ... {Element.show("process-indicator");Element.makePositioned("process-indicator");var top = document.body.scrollTop + 200;var left = "";if ($("process-indicator").style.width) ...{    left =window.document.body.scrollWidth/2-100;} else ...{left = parseInt(document.body.clientWidth / 2);}var style = ...{top:top + "px", left:left + "px"};Element.setStyle("process-indicator", style);//加个随机数,去除缓存影响var pars="rd=rd_"+parseInt(Math.random()*10000);var http=Ajax.getTransport();var contentType = "application/x-www-form-urlencoded; charset=utf-8";http.open("POST",url,true);http.setRequestHeader("Content-Type", contentType);http.onreadystatechange=function()...{     if (http.readyState == 4)...{      if (http.status==200)...{         afterGetComments(http);       }     }  }http.send(pars);} function  afterGetComments(request) ... {//提示框Element.hide("process-indicator");var xmldata=request.responseXML;var comments=xmldata.getElementsByTagName("comment");if(!comments)...{alert("暂无评论");return;}var len=comments.length;for(var i=0;i<len;i++)...{  var atti=comments[i].getAttribute("attitude");  var nn=comments[i].getElementsByTagName("nikename")[0].firstChild.nodeValue;  var rsn=comments[i].getElementsByTagName("data")[0].firstChild.nodeValue;  var date=comments[i].getElementsByTagName("pubdate")[0].firstChild.nodeValue;  generateCommentList(atti,nn,date,rsn)}}   // 对话框模块 var  lastDialog = null ; function  showDialog(dialog,offsetTop,offsetLeft) ... {    if (lastDialog) lastDialog.style.display="none";    dialog.style.top=offsetTop+"px";    dialog.style.left=offsetLeft+"px";    dialog.style.display="";    lastDialog=dialog;    document.onmousedown=toHideDialog} function  toHideDialog(event) ... {    if (!lastDialog) ...{document.onclick=null;return;}    var obj=null;    if(Browser.isIE) obj=window.event.srcElement;    else obj=event.target;    hideDialog();}      function  hideDialog() ... {    if (lastDialog) lastDialog.style.display="none";    lastDialog=null    document.onmousedown=null;}

6.CSS ufo.css

#comment {...} {    background-color: InactiveCaptionText;    width: 550px;    height:300px;    margin-top:10px;    }     #comment-bar {...} {        color:white;        padding-top: 5px;        padding-bottom: 5px;        text-align: center;        background-color: ActiveCaption;    }     #comment-form {...} {        padding-left:20px;    }     .button {...} {        BORDER-RIGHT: #283043 1px solid; PADDING-RIGHT: 1px; BORDER-TOP: #9097a2 1px solid;    PADDING-LEFT: 1px; BACKGROUND: ActiveCaption;; PADDING-BOTTOM: 1px;     BORDER-LEFT: #9097a2 1px solid; COLOR: #fff;     PADDING-TOP: 1px; BORDER-BOTTOM: #283043 1px solid;    margin: 10px;    }     #comment-lists {...} {    background-color: InactiveCaptionText;    width: 550px;    margin-bottom:10px;    }     div.comment-list {...} {        text-align: left;        border:1px solid ActiveCaption;        margin: 5px;    }     div.observer-info {...} {        color:white;        padding-top: 5px;        padding-bottom: 5px;        padding-left: 5px;        text-align: left;        background-color: ActiveCaption;        font-size: 14px;    }     div.observer-comment {...} {        padding-top: 5px;        padding-bottom: 5px;        text-align: left;    }     #process-indicator {...} {     margin:10px;padding-top:15px;padding-right:5px;padding-left:5px;     background-color:cyan;position:absolute;border:2px solid ActiveCaption;    }     .success  {...} {    COLOR: Blue;} .failure  {...} {    COLOR: #ff665b} #cinfoDiv  {...} {    position:absolute;    top:10px;    width:200px;    height:120px;    z-index:1000;    background-color:#F0F8FF;    border:1px solid #009999} #cinfoDiv h2 {...} {background-color:#483D8B;font-size:14px;color:#fff;text-align:center;margin-top:0px;} #cinfoDiv p {...} {margin:5px;text-align:center;vertical-align: top;font-size:14px;}

7.comment.xml

 

<? xml version="1.0" encoding="GB2312" ?> < comments >    < comment  id ="comment_4119"  attitude ="yes" >      < nikename > <![CDATA[ 薜荔女萝衣 ]]> </ nikename >      < data > <![CDATA[ 这个问题要全面分析。 外星很简单，相对于地球之外而言。 人吗，就给这个生物一个限定性标准了，至少要像人啊。 存在本身就是一个问题。谁能证明存在是存在的呢？ 谁又能全面地证明存在是不存在的呢？类似高尔吉亚的智者派的方法就不要再用了。 之后才要探讨是与否的问题。  ]]> </ data >      < pubdate > 2007-01-31 20:53:33 </ pubdate >    </ comment >    < comment  id ="comment_5953"  attitude ="yes" >      < nikename > <![CDATA[ ぁあ宇宙过客 ]]> </ nikename >      < data > <![CDATA[ 肯定会存在，难道真么大一个宇宙就只有地球有生物？  ]]> </ data >      < pubdate > 2007-01-31 20:56:17 </ pubdate >    </ comment >    < comment  id ="comment_2199"  attitude ="yes" >      < nikename > <![CDATA[ 匿名 ]]> </ nikename >      < data > <![CDATA[ 存在。如果没有的话怎么会在恐龙的肚子中找到一个相似外星化石呢？ ]]> </ data >      < pubdate > 2007-01-31 21:00:43 </ pubdate >    </ comment >    < comment  id ="comment_8637"  attitude ="yes" >      < nikename > <![CDATA[ 互相帮助小组 ]]> </ nikename >      < data > <![CDATA[ 有高等智慧生物吧，但不一定是人的形势啊！我坚信它们的存在。 ]]> </ data >      < pubdate > 2007-01-31 21:03:21 </ pubdate >    </ comment >    < comment  id ="comment_237"  attitude ="yes" >      < nikename > <![CDATA[ 秦国园林 ]]> </ nikename >      < data > <![CDATA[ 我就是外星人,我乘坐的大型飞行器----地球,不知什么时侯回到我的家乡----宇宙的起点.自从人类产生就和那失去了联系,你能告诉我航行的方向吗?船长先生.  ]]> </ data >      < pubdate > 2007-01-31 21:11:06 </ pubdate >    </ comment > </ comments >