PA165 - Lab session - Web Presentation Layer
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1 PA165 - Lab session - Web Presentation Layer Author: Martin Kuba <[email protected]> Goal Experiment with basic building blocks of Java server side web technology servlets, filters, context listeners, Java Server Pages, JSP EL Prerequisites Netbeans 7.3.x, Tomcat 7, Java 7, Maven 3 Maven web application Create a Maven web application. In NetBeans, choose File New Project, a proct creation wizard open. In its first step, select Categories: Maven, Projects: Web application : In its seconds step, type into the Package text field:: cz.muni.fi.pa165.web1 In its third step, select Tomcat and JavaEE 6 web. Click Finish. A new project is created. In Tools Options General Web browser choose you favorite browser. Press F6 or select Run Run project in menu. The project should compile, build, start Tomcat, deploy and open browser showing a page with Hello World!. Scream if something goes wrong.
2 Servlet games Find the source file src/main/webapp/index.jsp, delete its content and write the following: contenttype="text/html; charset=utf-8" pageencoding="utf-8"%> <!DOCTYPE html> <html> <head> <title>home</title> </head> <body> <h1>hooray, it works!</h1> <ul> <li><a href="${pagecontext.request.contextpath/text/direct?a=1&b=ccc">text directly from servlet</a></li> <li><a href="${pagecontext.request.contextpath/file">file</a></li> <li><a href="${pagecontext.request.contextpath/redirect">redirect</a></li> <li><a href="${pagecontext.request.contextpath/text/bla">intentional error</a></li> </ul> <h2>will work later</h2> <ul> <li><a href="${pagecontext.request.contextpath/text/fromjsp">text from JSP</a></li> <li><a href="${pagecontext.request.contextpath/protected/protectedfile.txt">protected by password</a></li> </ul> </body> </html> The expression ${pagecontext.request.contextpath includes URL prefix of the web application. In the cz.muni.fi.pa165.web1 package in the src/main/java directory create a new Java class (do not select New Servlet) named MyDemoServlet.java :
3 Put there the following code: package cz.muni.fi.pa165.web1; import javax.servlet.servletexception; import javax.servlet.servletoutputstream; import javax.servlet.annotation.webservlet; import javax.servlet.http.*; import javax.xml.bind.datatypeconverter; import java.io.ioexception; import java.io.printwriter; import java.net.urlencoder; import java.util.*; import = {"/text/*", "/file/*", "/redirect/*") public class MyDemoServlet extends HttpServlet { protected void doget(httpservletrequest request, HttpServletResponse response) throws ServletException, IOException { if ("/text".equals(request.getservletpath()) && "/direct".equals(request.getpathinfo())) { response.setcontenttype("text/html;charset=utf 8"); PrintWriter out = response.getwriter(); out.println("<h1>text</h1><pre>generated directly from servlet code"); out.println("serverinfo=" + getservletcontext().getserverinfo()); out.println("parameters:<i>"); for (String p : Collections.list(request.getParameterNames())) { out.println(p + "=" + request.getparameter(p)); else if ("/text".equals(request.getservletpath()) && "/fromjsp".equals(request.getpathinfo())) { request.setattribute("mylist", Arrays.asList("milk", "bread", "pizza")); request.getrequestdispatcher("/mypage.jsp").forward(request, response); else if ("/file".equals(request.getservletpath())) { response.setcontenttype("application/zip"); response.setheader("content disposition", "attachment; filename=\"myfile.zip\""); ServletOutputStream sos = response.getoutputstream(); ZipOutputStream zos = new ZipOutputStream(sos); zos.putnextentry(new ZipEntry("something.txt")); zos.write("some text".getbytes()); zos.putnextentry(new ZipEntry("differentfile.txt")); zos.write("other text".getbytes()); zos.close(); else if ("/redirect".equals(request.getservletpath())) { String url = request.getcontextpath() + "/text/direct?z=" + URLEncoder.encode("?/ =", "utf 8"); response.sendredirect(response.encoderedirecturl(url)); else { response.senderror(httpservletresponse.sc_not_found, "Nothing here, you are lost"); Run the project again (F6 or Run Run project) Try to click the links on the displayed page, and note the following: the servlet class is mapped to URLs using annotation the mapped URL contains 3 parts contextpath, servletpath and pathinfo the method request.getparameternames() returns java.util.enumeration for historical reasons, it can be converted to Iterable using Collections.list()
4 all request parameters are of type String when forwarding to another servlet or JSP, data are passed using the setattribute() method when sending binary content, like the ZIP file, the header Content disposition selects what the browser should do with the file inline means to display, attachment means to save to a file when redirecting, the application relative URL must be prepared: prepended with contextpath to make it absolute encoded using encoderedirecturl() to keep session parameter values must be URL encoded instead of content or a redirect, we can send an error message using senderror() JSP - Java Server Page In the previous example, the link /text/fromjsp did not work, because the servlet forwarded to a non existing JSP page. Now is the time to create it. Create the file src/main/webapp/mypage.jsp. (Do not write the.jsp extension in the file name, NetBeans adds it even when it is already present, naming the file mypage.jsp.jsp!) Put there the following code, which is a mix of 4 languages: HTML (Hyper Text Markup Language), CSS (Cascading Style Sheets), JavaScript and Java:: <%@page import="java.util.list"%> <%@page contenttype="text/html; charset=utf-8" pageencoding="utf-8"%> <!DOCTYPE html> <html> <head> <title>my JSP page</title> <style> #myheading { color: red; table.mytable { border-collapse: collapse; margin: 10px; table.mytable th, table.mytable td { border: solid 1px black; padding: 4px; </style> <script> console.log("hello JavaScript console!"); </script> </head> <body> <h1 id="myheading">my JSP page</h1> <p>list</p> <table class="mytable"> <% List<String> list = (List<String>) pagecontext.findattribute("mylist"); for(int i=0,n=list.size();i<n;i++) { %> <tr> <td><%=i%></td> <td><%=list.get(i)%></td> </tr> <% %> </table> </body> </html> Run the project again (F6). In Firefox press CTRL+Shift+K, in Chrome press F12, a javascript console will open showing the log message. Please note the following: at the first lines of a JSP, directive should define
5 the output encoding in contenttype, otherwise the default iso will be used the source file encoding in the pageencoding attribute, otherwise OS default will be used the CSS selector #myheading select the one element with attribute id= myheading the CSS selector.mytable selects all elements with attribute class= mytable in JavaScript, we can write tracing messages using console.log() Java code in JSP is written between <% %> there is always implicit variable pagecontext in a JSP of type PageContext there is always implicit variable out in a JSP of type JspWriter instead of <%out.print(i);%> it is possible to write <%=i%> direct output of arbitrary texts is dangerous, as they may contain special HTML characters <>&, but there is no standard class for HTML encoding using entities < > & JSTL - JSP Standard Tag Library Instead of Java code, we can use JSTL library, which, albeit being standard, is not a standard part of a web container. We have to add a dependency to the pom.xml Maven file: <dependency> <groupid>org.glassfish.web</groupid> <artifactid>javax.servlet.jsp.jstl</artifactid> <version>1.2.2</version> </dependency> Edit the mypage.jsp and add the line <%@ taglib prefix="c" uri=" %> and replace the loop with: <c:foreach items="${mylist" var="s" varstatus="i"> <tr> <td>${i.count</td> <td><c:out value="${s"/></td> </tr> </c:foreach>
6 Filter Create a new class in src/main/java/cz/muni/fi/pa165/web1 named ProtectFilter.java: package cz.muni.fi.pa165.web1; import java.io.ioexception; import javax.servlet.filter; import javax.servlet.filterchain; import javax.servlet.filterconfig; import javax.servlet.servletexception; import javax.servlet.servletrequest; import javax.servlet.servletresponse; import javax.servlet.http.httpservletrequest; import javax.servlet.http.httpservletresponse; import javax.xml.bind.datatypeconverter; import public class ProtectFilter implements Filter { private String username = "pepa"; private String password = "heslo"; public void init(filterconfig fc) throws ServletException { String u = fc.getinitparameter("username"); if(u!=null) username = u; String p = fc.getinitparameter("password"); if(p!=null) password = p; public void dofilter(servletrequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException { HttpServletRequest request = (HttpServletRequest) req; HttpServletResponse response = (HttpServletResponse) res; String auth = request.getheader("authorization"); if (auth == null) { response.setstatus(httpservletresponse.sc_unauthorized); response.setheader("www Authenticate", "Basic realm=\"type password\""); String[] creds = new String(DatatypeConverter.parseBase64Binary(auth.split(" ")[1])).split(":", 2); if(!creds[0].equals(username)!creds[1].equals(password)) { response.setstatus(httpservletresponse.sc_unauthorized); response.setheader("www Authenticate", "Basic realm=\"type password\""); chain.dofilter(req, res); public void destroy() { Create a folder src/main/webapp/protected and inside it create file protectedfile.txt with content top secret. Run the project (F6) and click the protected link. Log in using the username and password.
7 Context listener Create a new class in src/main/java/cz/muni/fi/pa165/web1 named StartListener.java: package cz.muni.fi.pa165.web1; import javax.servlet.servletcontext; import javax.servlet.servletcontextevent; import javax.servlet.servletcontextlistener; import public class StartListener implements ServletContextListener { public void contextinitialized(servletcontextevent ev) { ServletContext servletcontext = ev.getservletcontext(); servletcontext.log("starting application "); //initialize your app here... servletcontext.setattribute("mydb", "value"); public void contextdestroyed(servletcontextevent ev) { Run the project again (F6), you will in the Apache log the log message. Context listener is the right place for one time initialization at application start. That s all folks...
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