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使用JSP + JAVABEAN + XML 开发的一个例子

时间： 2021-07-31 作者：daque

本例子是参考了少许网站上相关jsp 对 xml 的操纵的关系文书档案，又贯串了少许部分的领会。例子波及的实质是，开拓的一个企业里面定餐体例后盾处置端的局部代码，功效重要会合在对于餐馆基础消息的处置。该例子自己开拓的来由是我在原公司和共事们一个打趣的一局部。特此也表白对那些一道同事的伙伴们的担心。例子自己是在tomcat4.01 平台下运转的b/s构造的程式。相关tomcat 的摆设，这边不做证明。只解说一下关系文献及文献夹的目次构造。目次构造证明：/tomcat/webapps/canyin/ -----主目次/tomcat/webapps/canyin/jsp/ -----jsp 文献目次/tomcat/webapps/canyin/jsp/admin/ -----实行后盾处置的jsp 文献的寄存目次/tomcat/webapps/canyin/web-inf/classes/canyin/ ------javabean 文献的寄存目次/tomcat/webapps/canyin/data/ -----xml 文献寄存目次/tomcat/webapps/root/ -----tomcat 启用文献寄存文献夹，只寄存了index.html 文献文献大略证明：/tomcat/webapps/canyin/data/users.xml -----记委派户消息/tomcat/webapps/canyin/data/restaurants.xml -----记载餐馆的普通消息/tomcat/webapps/root/index.html -----首页，页面展示输出框，诉求用户输出用户名，暗号/tomcat/webapps/canyin/jsp/loginjudge.jsp -----用户身份确定页面，按照用户称呼和暗号确定页面是转入后盾处置端，仍旧前台存户端。本例子中，用户身份一旦确觉得有处置权力，不妨加入后盾处置端，就径直跳到餐馆基础消息处置页面，简化证明的过程。/tomcat/webapps/canyin/jsp/admin/admin_rest.jsp -----餐馆基础消息处置页面，处置餐馆的称呼，电话，地方等消息/tomcat/webapps/canyin/web-inf/classes/canyin/checksessionbean.class ----- 后盾处置端检验和测定标记用户身份的session 的值，即使不是处置员的话，跳回登岸页面。 /tomcat/webapps/canyin/web-inf/classes/canyin/connxmlbean.class -----贯穿xml 文献/tomcat/webapps/canyin/web-inf/classes/canyin/writexmlbean.class -----写入xml文献文献精细引见及附带代码证明。/tomcat/webapps/canyin/data/users.xml 代码： <?xml version="1.0" encoding="utf-8" ?> - <users> <user name="joard" password="joard" roles="admin" /> <user name="joard01" password="joard01" roles="user" /> <user name="joard02" password="joard02" roles="user" /> </users> 证明：字段含意是用户名，暗号以及用户的身份 /tomcat/webapps/canyin/data/restaurants.xml 代码： <?xml version="1.0" encoding="utf-8" ?> - <restaurants num="10">- <restaurant id="1"> <name>上海亭快餐店</name> <phone>021-76546726</phone> <address>百老汇广场b座</address> </restaurant>- <restaurant id="8"> <name>香格里拉大饭馆</name> <phone>021-2312134</phone> <address>南京路1023号</address> </restaurant> </restaurants>证明：<num>属性是记载在restaurants.xml 文献中所有有过几何条记载，每新增一条，不管此后简略能否，该值城市减少1，就好象数据库中风气运用的机动减少1的id 项。用来给新增的 <restaurant>的属性<id>赋一个独一的值。其它的字段道理比拟鲜明。/tomcat/webapps/root/index.html （简单的html代码）代码：<html><head><title>oddworld 餐饮体例</title><meta http-equiv="content-type" content="text/html; charset=utf8"></head><body onload="javascript:dataform.username.focus()"><div align="center"> <table width="100%" border="0" cellspacing="0" cellpadding="0" height="22"> <tr> <td width="1"><img src="images/top_r1.gif" width="62" height="22"></td> <td width=150 align="center"> 餐饮体例登录 </td> <td><img src="images/top_r2.gif" width="294" height="22"></td> </tr> </table> <br> <br> <table width="300" border="0" cellspacing="1" cellpadding="0" > <tr> <td height="200" valign="top" align="center"> <p align="center"> <table width="100%" border="0" cellspacing="1" cellpadding="5" bgcolor=#999999 class=a9px> <tr> <td bgcolor="#efefef">餐饮体例登录</td> </tr> <tr> <td bgcolor="#ffffff" valign="top" align="center"> <table width="100%" border="0" cellspacing="0" cellpadding="0"> <form name=dataform method=post action=''canyin/jsp/loginjudge.jsp''> <tr> <td width="100"><b>登录名：</b></td> <td> <input maxlength=16 name="username" class=stedit value="joard"> </td> </tr> <tr> <td width="100"><b>暗号：</b></td> <td> <input class=stedit maxlength=16 name="userpass" type=password value="oddworld"> </td> </tr> </form> </table> <br> <table border=0 cellpadding=0 cellspacing=0> <tbody> <tr> <td> <input class=stbtm name=update onclick="javascript:if (checkform()==false);" type=button value="登录"> </td> <td> </td> <td> <input class=stbtm name=submit onclick="javascript:window.location.href=''index.asp?myjoke=1'';" type=button value="窜改暗号"> </td> <td> </td> </tr> </tbody> </table> <br> </td> </tr> </table> </td> </tr></table></div></body></html> <script language=javascript></script>证明：把用户称呼和用户暗号提交到/tomcat/webapps/canyin/jsp/loginjudge.jsp /tomcat/webapps/canyin/web-inf/classes/canyin/checksessionbean.class （代码是相映的java 文献）package canyin;import javax.servlet.http.httpsession;import javax.servlet.http.httpservletrequest;public class checksessionbean { private boolean bolcheckpass=false; private httpservletrequest request = null; public boolean checksessionbean(httpservletrequest request,string strsessionname,string strcheckvalue){ public boolean checksessionbean(httpservletrequest request){ httpsession session = request.getsession(false); return(bolcheckpass); if (strsessionname==null || strcheckvalue==null){ return(bolcheckpass); }else{ if (session!=null && session.getvalue(strsessionname)!=null){ bolcheckpass=session.getvalue(strsessionname).equals(strcheckvalue); } return(bolcheckpass); } }}证明：检查参数字传送入的session 称呼的数值和参数字传送入的字段的数值能否十分。/tomcat/webapps/canyin/web-inf/classes/canyin/connxmlbean.class 代码：package canyin;import javax.xml.parsers.*;import javax.xml.transform.*;import javax.xml.transform.dom.domsource;import javax.xml.transform.stream.streamresult;import org.w3c.dom.*;public class connxmlbean { private documentbuilderfactory factory=null; private documentbuilder builder=null; private document doc=null; public connxmlbean(){} public string connxml(string xmlfilename){ string strexc=""; try{ factory = documentbuilderfactory.newinstance(); builder=factory.newdocumentbuilder(); doc=builder.parse(xmlfilename); doc.normalize(); }catch(exception e){ strexc=e.tostring(); } return(strexc); } public document getxmldoc(){ return(doc); }}证明：翻开一个指定xml 文献/tomcat/webapps/canyin/web-inf/classes/canyin/writexmlbean.class 代码：package canyin;import javax.xml.parsers.*;import javax.xml.transform.*;import javax.xml.transform.dom.domsource;import javax.xml.transform.stream.streamresult;import java.io.file;import org.w3c.dom.*;public class writexmlbean { public writexmlbean(){} public string writexml(document doc,string xmlfilename){ string strexc=""; try{ transformerfactory tfactory = transformerfactory.newinstance(); transformer transformer = tfactory.newtransformer(); domsource source = new domsource(doc); streamresult result = new streamresult(new file(xmlfilename)); transformer.transform(source,result); }catch(exception e){ strexc=e.tostring(); } return(strexc); } }证明：写入dom 的实质到一个指定的xml 文献。/tomcat/webapps/canyin/jsp/loginjudge.jsp 代码：<%-- oddworld 餐饮处置体例(简体华文版) 2002年12月1日 copy right by joard ast loginjudge.jsp 功效：用户身份校验，按照 /data/user.xml 文献内标示的用户各别的身份确定转入后盾处置页面，仍旧存户订餐页面。 --%><%@ page contenttype="text/html;charset=utf8" %><%@ page language="java" import="javax.xml.parsers.*" %><%@ page import="org.w3c.dom.*" %><%@ page import="canyin.*" %> <jsp:usebean id="xmlbean" class="canyin.connxmlbean" scope="page" /><%session.setmaxinactiveinterval(1800);document doc;nodelist users;string strexc="";string strusername,strpassword;strusername=(string)request.getparameter("username");strpassword=(string)request.getparameter("userpass");//校验数据能否为空if (strusername=="" || strpassword=="" ){ out.println("<script language=''javascript''>"); out.println("alert(''用户名或暗号有空值!'');"); out.println("window.location.href=''/index.html'';"); out.println("</script>"); return;}xmlbean.connxml("webapps/canyin/data/users.xml");doc=xmlbean.getxmldoc();try{ users =doc.getelementsbytagname("user"); for (int i=0;i<users.getlength();i++){ element user=(element) users.item(i); string stratrnamevalue=user.getattributenode("name").getnodevalue(); string stratrpasswordvalue=user.getattributenode("password").getnodevalue(); string stratrrolevalue=user.getattributenode("roles").getnodevalue(); if (stratrnamevalue.equals(strusername) && stratrpasswordvalue.equals(strpassword)){ if (stratrrolevalue.equals("admin")){ out.println("<script language=''javascript''>"); out.println("alert(''欢送处置员登岸体例!'');"); out.println("</script>"); //树立标示用户身份的 session（sesuserrole），处置员身份为 admin session.setattribute("sesuserrole","admin"); //跳转到处置页面 response.sendredirect("admin/admin_rest.jsp"); return; }else{ //树立标示用户身份的 session（sesuserrole），处置员身份为 user session.setattribute("sesuserrole","user"); //跳转到普遍用户页面 response.sendredirect("index.jsp"); return; } }else{ out.println("<script language=''javascript''>"); out.println("alert(''用户名或暗号缺点!'');"); out.println("history.go(-1);"); out.println("</script>"); return; } }}catch(exception e){ strexc=e.tostring();}%>证明：......./tomcat/webapps/canyin/jsp/admin/admin_rest.jsp 代码：<%-- oddworld 餐饮处置体例(简体华文版) 2002年12月1日 copy right by joard ast admin_rest.jsp 功效：后盾处置页面，餐馆处置页面。 --%><%@ page contenttype="text/html;charset=utf8" %><%@ page language="java" import="javax.xml.parsers.*" %><%@ page import="javax.xml.transform.*" %><%@ page import="org.w3c.dom.*" %><%@ page import="canyin.*" %> <%@ include file="../../include/sys_dialog.jsp" %><jsp:usebean id="checksessionbean" class="canyin.checksessionbean" scope="page" /><jsp:usebean id="xmlbean" class="canyin.connxmlbean" scope="page" /><jsp:usebean id="writexmlbean" class="canyin.writexmlbean" scope="page" /><%//校验可户身份，确定是否处置员if(!checksessionbean.checksessionbean(request,"sesuserrole","admin")){ out.print(showdialog("您没有处置的权力!","/index.html")); return;}//从餐馆材料文献 rest.xml 中获得关系数据document doc;nodelist restaurants;string stract;int intid=0;string stroperation="show";//接收外部传入的参数stract=(string)request.getparameter("act");xmlbean.connxml("webapps/canyin/data/restaurants.xml");doc=xmlbean.getxmldoc();restaurants =doc.getelementsbytagname("restaurant");//按照外部传入的参数来确定对 restaurant.xml 文献的操纵if (stract!=null){ if(stract.equals("addnewdo")){ string strname; string strphone; string straddress; text textseg; strname=(string)request.getparameter("name").trim(); strphone=(string)request.getparameter("phone").trim(); straddress=(string)request.getparameter("address").trim(); //数据校验 if(strname==null){ out.print(showdialog("餐馆称呼不许为空!")); return; } if(strphone==null){ out.print(showdialog("餐馆电话不许为空!")); return; } /*if(straddress==null){ out.print(showdialog("餐馆地方不许为空!")); return; }*/ //校验数据的独一性 for(int i=0;i<restaurants.getlength();i++){ element restaurant=(element) restaurants.item(i); if(((string)restaurant.getelementsbytagname("name").item(0).getfirstchild().getnodevalue()).equals(strname)){ out.print(showdialog("餐馆称呼反复!")); return; }else{ if(((string)restaurant.getelementsbytagname("name").item(0).getfirstchild().getnodevalue()).equals(strphone)){ out.print(showdialog("餐馆电话反复!")); return; } } } //获得已有的记载数，给新增的餐馆记载设定独一的递加的id 属性 int intnum=0; element restnum=(element)doc.getelementsbytagname("restaurants").item(0); intnum=integer.parseint(restnum.getattributenode("num").getnodevalue()); intnum+=1; //为restaurants的属性num 的数值加1 restnum.getattributenode("num").setnodevalue(string.valueof(intnum)); //新增节点 element newrestaurant=doc.createelement("restaurant"); attr newarrid=doc.createattribute("id"); //attribute newarrid = new attribute("id",string.valueof(intnum)); textseg=doc.createtextnode(string.valueof(intnum)); newarrid.setvalue(string.valueof(intnum)); newrestaurant.setattributenode(newarrid); element newname=doc.createelement("name"); textseg=doc.createtextnode(strname); newname.appendchild(textseg); newrestaurant.appendchild(newname); element newphone=doc.createelement("phone"); textseg=doc.createtextnode(strphone); newphone.appendchild(textseg); newrestaurant.appendchild(newphone); element newaddress=doc.createelement("address"); textseg=doc.createtextnode(straddress); newaddress.appendchild(textseg); newrestaurant.appendchild(newaddress); doc.getdocumentelement().appendchild(newrestaurant); //挪用bean 写入相映的xml文献 writexmlbean.writexml(doc,"webapps/canyin/data/restaurants.xml"); response.sendredirect(request.getrequesturi()); return; } if(stract.equals("modido")){ string strname; string strphone; string straddress; text textseg; int modiid; //记载要窜改的记载是item(i)的哪一项 int inti=0; strname=(string)request.getparameter("name").trim(); strphone=(string)request.getparameter("phone").trim(); straddress=(string)request.getparameter("address").trim(); modiid=integer.parseint(request.getparameter("recordid").trim()); //数据校验 if(strname==null){ out.print(showdialog("餐馆称呼不许为空!")); return; } if(strphone==null){ out.print(showdialog("餐馆电话不许为空!")); return; } if(modiid==0){ out.print(showdialog("你要窜改餐馆的记载不生存!")); return; } /*if(straddress==null){ out.print(showdialog("餐馆地方不许为空!")); return; }*/ //标记表露记载生存 boolean recordexist=false; //校验数据的独一性 for(int i=0;i<restaurants.getlength();i++){ element restaurant=(element) restaurants.item(i); if(integer.parseint(restaurant.getattributenode("id").getnodevalue())==modiid){ recordexist=true; inti=i; } if(((string)restaurant.getelementsbytagname("name").item(0).getfirstchild().getnodevalue()).equals(strname) && integer.parseint(restaurant.getattributenode("id").getnodevalue())!=modiid ){ out.print(showdialog("餐馆称呼反复!")); return; }else{ if(((string)restaurant.getelementsbytagname("name").item(0).getfirstchild().getnodevalue()).equals(strphone) && integer.parseint(restaurant.getattributenode("id").getnodevalue())!=modiid ){ out.print(showdialog("餐馆电话反复!")); return; } } } if(!recordexist){ out.print(showdialog("你要窜改餐馆的记载不生存!")); return; }else{ //举行记载变动的操纵 try{ element modirestaurant=(element) restaurants.item(inti); modirestaurant.getelementsbytagname("name").item(0).getfirstchild().setnodevalue(strname); modirestaurant.getelementsbytagname("phone").item(0).getfirstchild().setnodevalue(strphone); modirestaurant.getelementsbytagname("address").item(0).getfirstchild().setnodevalue(straddress); //挪用bean 写入相映的xml文献 writexmlbean.writexml(doc,"webapps/canyin/data/restaurants.xml"); response.sendredirect(request.getrequesturi()); return; }catch(exception e){} } } //举行简略操纵 if(stract.equals("del")){ int delid; //记载要窜改的记载是item(i)的哪一项 int inti=0; delid=integer.parseint(request.getparameter("recordid").trim()); if(delid==0){ out.print(showdialog("你要窜改餐馆的记载不生存!")); return; } file://标记表露记载生存 boolean recordexist=false; //校验数据的独一性 for(int i=0;i<restaurants.getlength();i++){ element restaurant=(element) restaurants.item(i); if(integer.parseint(restaurant.getattributenode("id").getnodevalue())==delid){ recordexist=true; inti=i; } } if(!recordexist){ out.print(showdialog("你要简略餐馆的记载不生存!")); return; }else{ //举行记载简略的操纵 try{ node delnode=(node)restaurants.item(inti); doc.getelementsbytagname("restaurants").item(0).removechild(delnode); //挪用bean 写入相映的xml文献 writexmlbean.writexml(doc,"webapps/canyin/data/restaurants.xml"); response.sendredirect(request.getrequesturi()); return; }catch(exception e){} } }}//由外部传入参数确定页面相映的处置状况if (stract==null){ stroperation="show";}else{ if (stract.equals("modi")){ stroperation="modi"; intid=integer.parseint(request.getparameter("recordid")); }else{ if(stract.equals("addnew")){ stroperation="addnew"; }else{ stroperation="show"; } }}//即使为空记载，则变换页面状况为“新增”if (restaurants.getlength()==0){ stroperation="addnew";}%><html><head><title>oddworld 餐饮体例</title><meta http-equiv="content-type" content="text/html; charset=utf8"><meta http-equiv="expires" content="0"><link rel="stylesheet" href="../../include/itsp.css" type="text/css"></head><body ><div align="center"> <table width="100%" border="0" cellspacing="0" cellpadding="0" height="22"> <tr> <td width="1"><img src="../../images/top_r1.gif" width="62" height="22"></td> <td width=150 align="center"> 餐饮体例处置--餐馆处置</td> <td><img src="../../images/top_r2.gif" width="294" height="22"></td> <td width=100 align="center"><a href="/index.html">[ 退出体例 ]</a></td> </tr> </table> <br> <br> <table bgcolor="#999999" align=center border=0 cellpadding=1 cellspacing=1 width="90%"> <tbody> <tr bgcolor="#efefef" align="center" valign="middle"> <td class=tttable height=30 width="20"> </td> <td class=tttable height=30 width="0">餐馆称呼</td> <td class=tttable height=30 width="0">餐馆电话</td> <td class=tttable height=30 width="0"> <div align="center">餐馆地方</div> </td> <td class=tttable height=30 width="30"> <div align="center">窜改</div> </td> <td class=tttable height=30 width="30"> <div align="center">简略</div> </td> </tr><% for(int i=0;i<restaurants.getlength();i++) { element restaurant=(element) restaurants.item(i); if (stroperation=="modi" && integer.parseint(restaurant.getattributenode("id").getnodevalue())==intid){%> <%//表露窜改的方法%> <tr align="center" bgcolor="#ffffff" valign="middle"> <form name=dataform action="<%=request.getrequesturi()%>?act=modido" method="post" onsubmit=''return checkform(this);'' > <td class=tdsmall height=25 width="20"> <input type="hidden" name="recordid" value="<%=restaurant.getattributenode("id").getnodevalue()%>"> <%=(i+1)%></td> <td class=tdsmall height=25> <input name="name" class=stedit style="height: 22px; width: 150px" value="<%if(restaurant.getelementsbytagname("name").item(0).haschildnodes()){ out.print(restaurant.getelementsbytagname("name").item(0).getfirstchild().getnodevalue()); }%>" maxlength="40" > </td> <td class=tdsmall height=25> <input name="phone" class=stedit style="height: 22px; width: 100px" value="<%if(restaurant.getelementsbytagname("phone").item(0).haschildnodes()){ out.print(restaurant.getelementsbytagname("phone").item(0).getfirstchild().getnodevalue()); }%>" maxlength="20" > </td> <td class=tdsmall height=25> <input name="address" class=stedit style="height: 22px; width: 200px" value="<% if(restaurant.getelementsbytagname("address").item(0).haschildnodes()){ out.print(restaurant.getelementsbytagname("address").item(0).getfirstchild().getnodevalue()); }%>" maxlength="100" > </td> <td class=tdsmall height=25 width="25"><a href="javascript:if (checkform()==false);"><img border=0 height=15 src="../../images/editok.gif" width=15></a></td> <td class=tdsmall height=25 width="25"> </td> </form> </tr> <% }else{ //表露平常的方法 %> <tr align="center" bgcolor="#ffffff" valign="middle"> <td class=tdsmall height=25 width="20"><%=(i+1)%></td> <td class=tdsmall height=25 width="0"><%if(restaurant.getelementsbytagname("name").item(0).haschildnodes()){ out.print(restaurant.getelementsbytagname("name").item(0).getfirstchild().getnodevalue()); }%></td> <td class=tdsmall height=25 width="0"><%if(restaurant.getelementsbytagname("phone").item(0).haschildnodes()){ out.print(restaurant.getelementsbytagname("phone").item(0).getfirstchild().getnodevalue()); }%></td> <td class=tdsmall height=25 width="0"> <% if(restaurant.getelementsbytagname("address").item(0).haschildnodes()){ out.print(restaurant.getelementsbytagname("address").item(0).getfirstchild().getnodevalue()); }%> </td> <td class=tdsmall height=25 width="30"><a href="<%=request.getrequesturi()%>?act=modi&recordid=<%=restaurant.getattributenode("id").getnodevalue()%>"><img border=0 height=15 src="../../images/edit.gif" width=15></a></td> <td class=tdsmall height=25 width="30"><img border=0 height=15 onclick="javascript:if(confirm(''您能否决定简略本记载，简略后将导至记载没辙运用？'')){window.location.href=''<%=request.getrequesturi()%>?act=del&recordid=<%=restaurant.getattributenode("id").getnodevalue()%>'';}" src="../../images/delete.gif" style="cursor: hand" width=15> </td> </tr> <% } }%> <% if (stroperation=="addnew"){ //表露新增的方法%> <tr align="center" bgcolor="#ffffff" valign="middle"> <form name=dataform2 action="<%=request.getrequesturi()%>?act=addnewdo" method="post" onsubmit=''return checkform2(this);'' > <td class=tdsmall height=25 width="20"></td> <td class=tdsmall height=25> <input name="name" class=stedit style="height: 22px; width: 150px" value="" maxlength="40" > </td> <td class=tdsmall height=25> <input name="phone" class=stedit style="height: 22px; width: 100px" value="" maxlength="20" > </td> <td class=tdsmall height=25> <input name="address" class=stedit style="height: 22px; width: 200px" value="" maxlength="100" > </td> <td class=tdsmall height=25 width="25"><a href="javascript:if (checkform2()==false);"><img border=0 height=15 src="../../images/editok.gif" width=15></a></td> <td class=tdsmall height=25 width="25"> </td> </form> </tr> <% } %> </tbody> </table> <br> <table align=center border=0 cellpadding=0 cellspacing=2 width="95%"> <tbody> <tr valign=center> <td align=middle> <br> <table border=0 cellpadding=0 cellspacing=0> <tr> <td> <% if (stroperation=="addnew"){ %> <input class=stbtm name=update onclick="javascript:if (checkform2()==false);" type=button value="革新记载"> <% }else{ if(stroperation=="modi"){ %> <input class=stbtm name=update onclick="javascript:if (checkform()==false);" type=button value="革新记载"> <% }else{ %> <input class=stbtm type="button" name="button" value="新增" onclick="javascript:window.location.href=''<%=request.getrequesturi()%>?act=addnew'';"><% } } %> </td> <td> <input class=stbtm type="button" name="button" value="返回" onclick="javascript:window.location.href=''index.jsp'';"> </td> </tr> </table> </td> </tr> </table> <p> </p></div></body></html><script language=javascript></script>证明：本文献的抄写有很多场合并不简单，由于在程式的开拓进程中，过度简单的步调常常会带来后期保护的艰巨。开拓心得：doc.getelementsbytagname("restaurants").item(int i)的归来值是node 型，即使不是要挪用它的属性值，没有需要强迫转型为 element型。不妨径直操纵。本体例由于开拓的参考材料的缺点，以是全都沿用了强迫转型。不妨在此后的开拓中商量运用node 径直举行操纵。trim() 和 interger.parseint() 因变量都不不妨接收null 型的数值在tomcat 下安排的文献都是目次从tomcat 算起，简直情景请拜见\webapps\canyin\jsp\userjudge.jsp 里对于xml 路途的写法。对原代码感爱好的伙伴请经过如次邮箱和我接洽，joard@163.com

使用JSP + JAVABEAN + XML 开发的一个例子

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