Data packaging and XSLT parsing data in servlet applications
I wrote a small web application today: a simple landing interface (HTML), enter the user's name and mailbox. You can then click Submit. The submitted interface is a welcome interface - display the name of the user and the mailbox. This implementation process does not involve access to the database.
Let me talk about my realization.
1. Get the data entered from the landing interface, construct a subclass of Javax.serveT.Filter to process (package) to get data, use the Document instance (DOM) in org.w3c.dom package to package this data, and put These data is placed in the instance of HTTPSession
2. In the LoginServlet (subcategory of javax.servlet.http.servlet), use the previously write XSLT file to parse the Document object (DOM) in the HTTPSession instance, and send the resolution result to response.getwriter (), users Seeing that the original window is converted into a successful window to display the information you just entered.
This is an example of a combined with the servlet, as well as XML and XSLT.
As follows:
INDEX.HTML
login - filtertest </ title></p>
<p></ hEAD></p>
<p><body></p>
<p><H1> Input Your ID and email </ h1></p>
<p><hr /></p>
<p><form action = "/ login" method = "post"></p>
<p><table></p>
<p><tr></p>
<p><TD> Name: </ TD></p>
<p><TD></p>
<p><Input name = "name" type = "text" /></p>
<p></ td></p>
<p></ TR></p>
<p><tr></p>
<p><TD> Email: </ TD></p>
<p><TD></p>
<p><Input name = "email" type = "text" /></p>
<p></ td></p>
<p></ TR></p>
<p><tr></p>
<p><TD /></p>
<p><TD></p>
<p><Input name = "submit" type = "submit" value = "save" /></p>
<p></ td></p>
<p></ TR></p>
<p></ TABLE></p>
<p></ form></p>
<p></ body></p>
<p></ html></p>
<p>InfoFilter.java</p>
<p>Import javax.servlet. *;</p>
<p>Import javax.servlet.http. *;</p>
<p>Import java.io. *;</p>
<p>Import java.util. *;</p>
<p>Import org.w3c.dom. *;</p>
<p>Import javax.xml.parsers. *;</p>
<p>Public Class Infofilter IMPLEments FILTER</p>
<p>{</p>
<p>PRIVATE FILTERCONFIG FCONFIG = NULL;</p>
<p>PUBLIC Infofilter () {</p>
<p>}</p>
<p>Public void init (FilterConfig FC) throws servletexception {</p>
<p>Fconfig = fc;</p>
<p>}</p>
<p>Public void destroy () {</p>
<p>Fconfig = NULL;</p>
<p>}</p>
<p>Public Void Dofilter (Final ServletRequest Request, Final ServletResponse Response, Filterchain Chain)</p>
<p>THROWS IOException, servletexception {</p>
<p>HTTPSERVLETREQUEST HTTPREQUEST = (httpservletRequest) Request;</p>
<p>Enumeration paramnames = httpRequest.getParameterNames ();</p>
<p>Try {</p>
<p>DocumentBuilderFactory DBF = DocumentBuilderFactory.newinstance ();</p>
<p>DocumentBuilder docbuilder = dbf.newdocumentbuilder ();</p>
<p>Document doc = docbuilder.newdocument ();</p>
<p>ELEMENT INFO = Doc.createElement ("info");</p>
<p>Doc.Appendchild (Info);</p>
<p>While (paramnames.hasmoreElements ()) {</p>
<p>String paramname = (string) paramnames.nextelement ();</p>
<p>String paramvalue = (string) (paramname); paramname [0]);</p>
<p>Element elem = doc.createElement (paramname);</p>
<p>ELEM.APPENDCHILD (Doc.createTextNode (paramvalue);</p>
<p>INFo.Appendchild (ELEM);</p>
<p>}</p>
<p>HttpSession session = httpRequest.getations;</p>
<p>Session.SetaTribute ("DOC", DOC);</p>
<p>Chain.dofilter (httpRequest, response);</p>
<p>} catch (ParserConfigurationException E) {</p>
<p>PrintWriter PW = response.getwriter ();</p>
<p>PW.Println ("<html> <head> <title> error </ title> </ head>");</p>
<p>PW.Println ("<body> <h1> Error Happened in Building Domtree <H1> </ Body> </ HTML>");</p>
<p>}</p>
<p>}</p>
<p>}</p>
<p>LoginServlet.java</p>
<p>Import java.io. *;</p>
<p>Import java.net. *;</p>
<p>Import javax.servlet. *;</p>
<p>Import javax.servlet.http. *;</p>
<p>Import javax.xml.transform. *;</p>
<p>Import javax.xml.transform.dom. *;</p>
<p>Import javax.xml.transform.stream. *;</p>
<p>Import org.w3c.dom. *;</p>
<p>Import javax.xml.parsers. *;</p>
<p>Public Class loginservlet Extends httpservlet</p>
<p>{</p>
<p>Protected void dopost (httpservletRequest request, httpservletResponse response) {</p>
<p>HttpSession session = request.getations (TRUE);</p>
<p>Document doc = (document) session.getattribute ("doc"); try {</p>
<p>TransformerFactory Transfact = TransformerFactory.newInstance ();</p>
<p>String xltname = "/web-inf/xslt/info.xslt";</p>
<p>URL URL = GetServletContext (). Getresource (xsltname);</p>
<p>String systemid = url.toExternalForm ();</p>
<p>Templates Infotemplate = Transfact.Newtemplates (New StreamSource (SystemID));</p>
<p>Transformer Trans = Infotemplate.NewTransformer ();</p>
<p>Response.setContentType (Text / HTML ");</p>
<p>PrintWriter PW = response.getwriter ();</p>
<p>Trans.Transform (New Domsource (DOC), New StreamResult (PW));</p>
<p>session.INVALIDATE ();</p>
<p>} catch (exception e) {</p>
<p>E.PrintStackTrace ();</p>
<p>session.INVALIDATE ();</p>
<p>}</p>
<p>}</p>
<p>}</p>
<p>Info.xslt</p>
<p><? XML Version = "1.0" encoding = "UTF-8"?></p>
<p><xsl: stylesheet version = "1.0" xmlns: xsl = "http://www.w3.org/1999/xsl/transform"</p>
<p>XMLns = "http://www.w3.org/1999/xhtml"></p>
<p><xsl: Output method = "xml" indent = "yes" encoding = "UTF-8"</p>
<p>DOCTYPE-PUBLIC = "- // w3c // DTD XHTML 1.0 Transitional // EN"</p>
<p>DOCTYPE-System = "http://www.w3.org/tr/xhtml1/dtd/xhtml1-transitional.dtd" /></p>
<p><XSL: Template Match = "/"></p>
<p><html></p>
<p><HEAD></p>
<p><Title></p>
<p><XSL: Text> Welcome, </ XSL: Text></p>
<p><XSL: Value-of SELECT = "/ info / name" /></p>
<p></ title></p>
<p></ hEAD></p>
<p><body></p>
<p><tr></p>
<p><h1></p>
<p><TD> <XSL: Text> Welcome, </ XSL: Text> </ TD></p>
<p><TD> <XSL: Value-of Select = "/ info / name" /> </ td></p>
<p></ h1></p>
<p></ TR></p>
<p><hr /></p>
<p><tr></p>
<p><h3></p>
<p><TD> <XSL: Text> Your Email IS: </ XSL: Text> </ TD></p>
<p><TD> <XSL: Value-of Select = "/ info / email" /> </ td> </ h3></p>
<p></ TR></p>
<p><hr /></p>
<p><tr></p>
<p><p align = "right" /></p>
<p><a href="/index.html"> back to homepage </A></p>
<p></ TR></p>
<p></ body></p>
<p></ html></p>
<p></ xsl: template></p>
<p></ xsl: stylesheet></p>
<p>Web.xml</p>
<p><? XML Version = "1.0" encoding = "UTF-8"?></p>
<p><web-app xmlns = "http://java.sun.com/xml/ns/j2ee"</p>
<p>XMLns: xsi = "http://www.w3.org/2001/xmlschema-instance"</p>
<p>XSI: schemAlocation = "http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"</p>
<p>Version = "2.4"></p>
<p><servlet></p>
<p><servlet-name> Login </ servlet-name></p>
<p><servlet-class> loginservlet </ servlet-class></p>
<p></ servlet></p>
<p><servlet-mapping></p>
<p><servlet-name> Login </ servlet-name></p>
<p><url-pattern> / login </ url-pattern></p>
<p></ servlet-maping></p>
<p><filter></p>
<p><filter-name> infofilter </ filter-name></p>
<p><filter-class> infofilter </ filter-class></p>
<p></ filter></p>
<p><filter-mapping></p>
<p><filter-name> infofilter </ filter-name></p>
<p><url-pattern> / login </ url-pattern></p>
<p></ filter-mapping></p>
<p></ web-app></p>
<p>deploy:</p>
<p>INDEX.HTML</p>
<p>SRC</p>
<p>InfoFilter.java</p>
<p>LoginServlet.java</p>
<p>WEB-INF</p>
<p>Web.xml</p>
<p>Classes</p>
<p>InfoFilter.class</p>
<p>LoginServlet.class</p>
<p>xslt</p>
<p>Info.xslt</p>
<p>Postscript: At the time of debugging, a problem is found, the work in a web application is very large. When writing code, writing "InfoFilter>" in <filter-name> in <filter-maping>, "InfoFilter>" results in the browser are invisible to call index.html. It can be seen that Tomcat is strict in implementing Web.xml requirements in a web application. If you have a 404 error in debug this program application, you may wish to check the web.xml file carefully.</p></div><div class="text-center mt-3 text-grey">
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