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Home  >  Article  >  Backend Development  >  Summary of parsing RSS issues

Summary of parsing RSS issues

Y2J
Y2JOriginal
2017-04-24 16:35:552484browse

try{ 
   org.dom4j.io.SAXReader saxReader = new org.dom4j.io.SAXReader();
   org.dom4j.Document document = saxReader.read(rssUrl);
   org.dom4j.Element channel = (org.dom4j.Element) document.getRootElement().element("channel");
     int index =0;
           for (java.util.Iterator i = channel.elementIterator("item"); i.hasNext();){ 
            if(index+1>rssTable.Rows.length){
             break;
            } 
             org.dom4j.Element element = (org.dom4j.Element) i.next();
                String title = element.elementText("title");
                String link = element.elementText("link");
                String pubDate = element.elementText("pubDate");
                String source = element.elementText("source");  
                ci.adp.DataRow rssRow = rssTable.getDataRowByIndex(index);
              
                rssRow.setValue("TITLE", title);
                rssRow.setValue("LINK", link);
                rssRow.setValue("PUBDATE", pubDate);
                rssRow.setValue("SOURCE", source); 
                /*
                System.out.println("title标题: " + title);
                System.out.println("link链接: " + link);
                System.out.println("pubDate发布时间: " +pubDate); 
                System.out.println("source来源: " + source);
                */
                index++;  
           }
  }catch (Exception e) { 
   e.printStackTrace();
  }

After struggling all morning, I finally figured it out in another way.

The above dom4j method works fine in my local environment (windows+weblogic10+jdk1.6),
put it on the server (linux5.4 x64+weblogic10 +jdk1.6), this error is always reported: 

[oracle@ablw010215 bin]$ Warning: Caught exception attempting to use SAX to load a SAX XMLReader
Warning: Exception was: java.lang.ClassCastException: com.sun.org.apache.xerces.internal.parsers.XIncludeAwareParserConfiguration
Warning: I will print the stack trace then carry on using the default SAX parser
java.lang.ClassCastException: com.sun.org.apache.xerces.internal.parsers.XIncludeAwareParserConfiguration
        at org.xml.sax.helpers.XMLReaderFactory.loadClass(XMLReaderFactory.java:199)
        at org.xml.sax.helpers.XMLReaderFactory.createXMLReader(XMLReaderFactory.java:150)
        at org.dom4j.io.SAXHelper.createXMLReader(SAXHelper.java:83)
        at org.dom4j.io.SAXReader.createXMLReader(SAXReader.java:894)
        at org.dom4j.io.SAXReader.getXMLReader(SAXReader.java:715)
        at org.dom4j.io.SAXReader.read(SAXReader.java:435)
        at org.dom4j.io.SAXReader.read(SAXReader.java:321)
        at jsp_servlet._ajax._comm._bbs.__iframearticlecontent._jspService(__iframearticlecontent.java:100)
        at weblogic.servlet.jsp.JspBase.service(JspBase.java:35)
        at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
        at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
        at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:300)
        at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:27)
        at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
        at ci.filter.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:107)
        at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
        at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3715)
        at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3681)
        at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
        at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)
        at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2277)
        at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2183)
        at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1454)
        at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)
        at weblogic.work.ExecuteThread.run(ExecuteThread.java:178)
org.dom4j.DocumentException: SAX2 driver class weblogic.xml.jaxp.RegistryXMLReader does not implement XMLReader Nested exception: SAX2 driver class weblogic.xml.jaxp.RegistryXMLReader does not implement XMLReader
        at org.dom4j.io.SAXReader.read(SAXReader.java:484)
        at org.dom4j.io.SAXReader.read(SAXReader.java:321)
        at jsp_servlet._ajax._comm._bbs.__iframearticlecontent._jspService(__iframearticlecontent.java:99)
        at weblogic.servlet.jsp.JspBase.service(JspBase.java:35)
        at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
        at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
        at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:300)
        at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:27)
        at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
        at ci.filter.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:107)
        at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
        at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3715)
        at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3681)
        at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
        at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)
        at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2277)
        at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2183)
        at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1454)
        at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)
        at weblogic.work.ExecuteThread.run(ExecuteThread.java:178)
Nested exception: 
java.lang.ClassCastException: com.sun.org.apache.xerces.internal.parsers.XIncludeAwareParserConfiguration
        at org.dom4j.io.SAXHelper.createXMLReader(SAXHelper.java:98)
        at org.dom4j.io.SAXReader.createXMLReader(SAXReader.java:894)
        at org.dom4j.io.SAXReader.getXMLReader(SAXReader.java:715)
        at org.dom4j.io.SAXReader.read(SAXReader.java:435)
        at org.dom4j.io.SAXReader.read(SAXReader.java:321)
        at jsp_servlet._ajax._comm._bbs.__iframearticlecontent._jspService(__iframearticlecontent.java:100)
        at weblogic.servlet.jsp.JspBase.service(JspBase.java:35)
        at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
        at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
        at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:300)
        at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:27)
        at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
        at ci.filter.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:107)
        at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
        at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3715)
        at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3681)
        at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
        at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)
        at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2277)
        at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2183)
        at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1454)
        at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)
        at weblogic.work.ExecuteThread.run(ExecuteThread.java:178)
Nested exception: java.lang.ClassCastException: com.sun.org.apache.xerces.internal.parsers.XIncludeAwareParserConfiguration
        at org.dom4j.io.SAXHelper.createXMLReader(SAXHelper.java:98)
        at org.dom4j.io.SAXReader.createXMLReader(SAXReader.java:894)
        at org.dom4j.io.SAXReader.getXMLReader(SAXReader.java:715)
        at org.dom4j.io.SAXReader.read(SAXReader.java:435)
        at org.dom4j.io.SAXReader.read(SAXReader.java:321)
        at jsp_servlet._ajax._comm._bbs.__iframearticlecontent._jspService(__iframearticlecontent.java:100)
        at weblogic.servlet.jsp.JspBase.service(JspBase.java:35)
        at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
        at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
        at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:300)
        at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:27)
        at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
        at ci.filter.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:107)
        at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
        at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3715)
        at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3681)
        at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
        at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)
        at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2277)
        at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2183)
        at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1454)
        at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)
        at weblogic.work.ExecuteThread.run(ExecuteThread.java:178)

5ec35a6e65935d15cb9c490e1c779837 196b221079040666e3f89e6491d8e40a b382046ee41c398bcec9921d8832c4ff 6bc501c6818cb3f5d42283b4e4649af5 940b43805e9afc81032aa6c833513b7b
5ec35a6e65935d15cb9c490e1c779837 196b221079040666e3f89e6491d8e40a 03cfe3cb30abd31ff0188b311f8d8d7d 6bc501c6818cb3f5d42283b4e4649af5 a4f8b6e3d08b8686c74164db780d09e4

在weblogic Adding configuration files to .xml, adding lib packages, etc. will not work. Just replace it with this one (it depends on the lib in the resources I uploaded, completely free): 

try { URL url = new URL(rss); // 读取Rss源 XmlReader reader = new XmlReader(url); System.out.println("Rss源的编码格式为：" + reader.getEncoding()); SyndFeedInput input = new SyndFeedInput(); SyndFeed feed = input.build(reader); // 得到SyndFeed对象，即得到Rss源里的所有信息 List entries
 = feed.getEntries(); // 得到Rss新闻中子项列表 int index =0; for (int i = 0; i < entries.size(); i++) { // 循环得到每个子项信息 if(index+1>rssTable.Rows.length){ break; } SyndEntry entry = (SyndEntry) entries.get(i); /* System.out.println("标题：" + entry.getTitle()); System.out.println("连接地址："
 + entry.getLink()); SyndContent description = entry.getDescription(); System.out.println("标题简介：" + description.getValue()); System.out.println("发布时间：" + entry.getPublishedDate()); // 以下是Rss源可先的几个部分 System.out.println("标题的作者：" + entry.getAuthor()); */ ci.adp.DataRow
 rssRow = rssTable.getDataRowByIndex(index); rssRow.setValue("TITLE", entry.getTitle()); rssRow.setValue("LINK", entry.getLink()); rssRow.setValue("PUBDATE", entry.getPublishedDate()); rssRow.setValue("SOURCE", entry.getAuthor()); /* // 此标题所属的范畴 List categoryList
 = entry.getCategories(); if (categoryList != null) { for (int m = 0; m < categoryList.size(); m++) { SyndCategory category = (SyndCategory) categoryList .get(m); System.out.println("此标题所属的范畴：" + category.getName()); } } */ index++; /* // 得到流媒体播放文件的信息列表 List
 enclosureList = entry.getEnclosures(); if (enclosureList != null) { for (int n = 0; n < enclosureList.size(); n++) { SyndEnclosure enclosure = (SyndEnclosure) enclosureList .get(n); System.out.println("流媒体播放文件：" + entry.getEnclosures()); } } */ } } catch (Exception
 e) { e.printStackTrace(); }

org.dom4j.io.SAXReader saxReader = new org.dom4j.io.SAXReader();org.dom4j.Document document = saxReader.read(rssUrl);org.dom4j.Element channel = (org.dom4j.Element) document.getRootElement().element("channel"); int index =0; for (java.util.Iterator i = channel.elementIterator("item");
 i.hasNext();){ if(index+1>rssTable.Rows.length){ break; } org.dom4j.Element element = (org.dom4j.Element) i.next(); String title = element.elementText("title"); String link = element.elementText("link"); String pubDate = element.elementText("pubDate"); String
 source = element.elementText("source"); ci.adp.DataRow rssRow = rssTable.getDataRowByIndex(index); rssRow.setValue("TITLE", title); rssRow.setValue("LINK", link); rssRow.setValue("PUBDATE", pubDate); rssRow.setValue("SOURCE", source); /* System.out.println("title标题:
 " + title); System.out.println("link链接: " + link); System.out.println("pubDate发布时间: " +pubDate); System.out.println("source来源: " + source); */ index++; }

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