JDOM使用实例--外星人是否存在的调查_找不到import org.jdom.input.saxbuilder-优快云博客

本文介绍了一个使用JDOM库进行XML文件读写的具体案例，包括如何在XML中添加和删除评论节点，并通过AJAX与JSP页面交互，展示了从前端到后端的完整流程。

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/*********************************************
*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:

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">

<head>

</head>

<!--

window.onload=function(){

getComments("<%=basePath%>data/comment.xml");

}

//-->

</SCRIPT>

<body>

<h2>

信息提示

</h2>

</p>

</div>

<table id="process-indicator"

style="display:none;z-index:100;width:300px;">

<tr>

<td>

<p>

正在处理中...

</p>

</td>

</tr>

</table>

</div>

</div>

你认为外星人存在吗?

</div>

昵称:

存在

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>

</form>

</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"?>

<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>

</comment>

<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>

</comment>

</comment>

</comment>

<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>

</comment>

</comments>