jsp解析xml文件

遇到一個問題：需要將xml信息通過jsp加載：

主要是兩個問題：

1：xml文件相對於jsp頁面路徑的選擇;

2:xml加載成功並且正確解析

xml信息：

< products >

       < product title = "aaaa" id = "11111" >

             < part title = "aaa_part" >

                   < info >iinfo1 </ info >

                   < info >info2 </ info >

             </ part >

             < part title = "aaa_part1" >

                   < info >iinfo3 </ info >

                   < info >info4 </ info >

             </ part >

       </ product >

      

          < product title = "aaaa" id = "11111" >

             < part title = "aaa_part" >

                   < info >iinfo1 </ info >

                   < info >info2 </ info >

             </ part >

             < part title = "aaa_part1" >

                   < info >iinfo3 </ info >

                   < info >info4 </ info >

             </ part >

       </ product >

</ products >

 

---

jsp文件代碼：

<%@ page language = "java" contentType = "text/html; charset=UTF-8"

    pageEncoding = "UTF-8" %>

<%@ page import = "java.io.File,javax.xml.parsers.DocumentBuilder" %>

<%@ page import = "javax.xml.parsers.DocumentBuilderFactory" %>

<%@ page import = "org.w3c.dom.Document" %>

<%@ page import = "org.w3c.dom.NodeList" %>

<%@ page import = "org.w3c.dom.Node" %>

<%@ page import = "org.w3c.dom.NamedNodeMap" %>

<%@ page import = "org.w3c.dom.Element" %>

<! 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=ISO-8859-1" >

< title >。。。。。 </ title >

</ head >

< body >

       < a href = "javascript:history.go(-1);" class = "previous" ></ a >

 

       <%

            String procode=request.getParameter( "procode" );

            String xml= null ;

            String url= null ;

             if (procode.length()>4){

                   //xml=url.substring(0, url.lastIndexOf('/'))+"/xml/"+procode.subSequence(0, 4)+".xml";

                   xml= "/xml/" +procode.subSequence(0, 4)+ ".xml" ;

                   //url=request.getServletContext().getRealPath(xml);

                   //url=request.getRequestURI().substring(0, request.getRequestURI().lastIndexOf('/'))+xml;

                   //url=request.getRequestURL().toString();

                  url=application.getRealPath(request.getRequestURI());

                  System.out.println( "realurl=" +url);

                  url=url.substring(0, url.lastIndexOf( '/' ))+xml;

                   //url="WebContent/chinapost/weixin/finanProIntroduct/"+xml; 

            }

            System.out.println( "url=" +url);

            System.out.println( "xml=" +xml);

             try {

                  File f= new File(url);

                  DocumentBuilderFactory factory=DocumentBuilderFactory.newInstance();

                  DocumentBuilder builder=factory.newDocumentBuilder();

                  Document doc=builder.parse(f);

                  NodeList nl=doc.getElementsByTagName( "product" );

                  Element product= null ;

                   for ( int i=0;i<nl.getLength();i++){

                        Element node=(Element)nl.item(i);

                        String id=node.getAttribute( "id" );

                         if (procode.equals(id)){

                              product=node;

                               break ;

                        }

                  }

                  

                   String title=product.getAttribute( "title" );

                  out.println( "<h1 class=\"art_title\">" +title+ "</h1>" );

                  String explain= null ;

                   try {

                               explain=product.getAttribute( "explain" );

                   if (explain!= null &&! "" .equals(explain)){

                        out.println( "<ul class=\"art_ul\"><li>" +explain+ "</li></ul>" );

                  }

                  } catch (Exception e){

                        System.out.println( "..........." );

                  }

                  out.println( "<div class=\"art_content\">" );

                   NodeList parts =product.getElementsByTagName( "part" );

                   for ( int i=0;i<parts.getLength();i++){

                        Element node=(Element)parts.item(i);

                         //NamedNodeMap partMap=node.getAttributes();

                         //String partTitle=partMap.getNamedItem("title").getNodeValue();

                        String partTitle=node.getAttribute( "title" );

                        out.println( "<h2 class=\"art_h2 art_h2_1\">" +partTitle+ "</h2>" );

                        out.println( "<ul class=\"art_ul\">" );

                              NodeList infos=node.getElementsByTagName( "info" );

                               for ( int j=0;j<infos.getLength();j++){

                                    Element info=(Element)infos.item(j);

　　　　　　　　　　　　　　　　　　　　　　//獲取元素<info>中的信息

                                    out.println( "<li>"+info.getFirstChild().getNodeValue()+"</li>");

                              }

                        out.println( "</ul>" );

                  }

                  out.println( "</div>" );

                  

            } catch (Exception e){

                  e.printStackTrace();

            }

            

       %>

</ body >

</ html >