Jetty example source code file (AnnotationTest.java)

This example Jetty source code file (AnnotationTest.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Jetty tags/keywords

annotation, double, exception, fail, fail, http, initialcontext, initialcontext, lookup, naming, pass, request, resource, resource, response, result, servlet, string, string, usertransaction

The Jetty AnnotationTest.java source code

/**
 * 
 */
package com.acme;

import java.io.IOException;

import javax.naming.InitialContext;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.sql.DataSource;
import javax.transaction.UserTransaction;
import javax.annotation.Resource;
import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.annotation.security.RunAs;

/**
 * AnnotationTest
 * 
 * Use Annotations from within Jetty.
 * 
 * Also, use servlet spec 2.5 resource injection and lifecycle callbacks from within the web.xml
 * to set up some of the JNDI resources.
 *
 */

@RunAs("special")
public class AnnotationTest extends HttpServlet 
{
    private String postConstructResult = "";
    private String dsResult = "";
    private String envResult = "";
    private String envLookupResult = "";
    private String envResult2 ="";
    private String envLookupResult2 = "";
    private String envResult3 = "";
    private String envLookupResult3 = "";
    private String dsLookupResult = "";
    private String txResult = "";
    private String txLookupResult = "";
    private DataSource myDS;
    
    @Resource(mappedName="UserTransaction")
    private UserTransaction myUserTransaction;


    @Resource(mappedName="maxAmount")
    private Double maxAmount;
    
    @Resource(name="someAmount")
    private Double minAmount;

    @Resource
    private Double avgAmount;

   
    @Resource(mappedName="jdbc/mydatasource")
    public void setMyDatasource(DataSource ds)
    {
        myDS=ds;
    }
  
    
    @PostConstruct
    private void myPostConstructMethod ()
    {       
        postConstructResult = "Called";
       try 
       {
           dsResult = (myDS==null?"FAIL":"myDS="+myDS.toString());
       }
       catch (Exception e)
       {
           dsResult = "FAIL: "+e;
       }


       envResult = (maxAmount==null?"FAIL":"maxAmount="+maxAmount.toString());
       
       try
       {
           InitialContext ic = new InitialContext();
           envLookupResult = "java:comp/env/com.acme.AnnotationTest/maxAmount="+ic.lookup("java:comp/env/com.acme.AnnotationTest/maxAmount");
       }
       catch (Exception e)
       {
           envLookupResult = "FAIL: "+e;
       }

      envResult2 = (minAmount==null?"FAIL":"minAmount="+minAmount.toString());
      try
      {
          InitialContext ic = new InitialContext();
          envLookupResult2 = "java:comp/env/someAmount="+ic.lookup("java:comp/env/someAmount");
      }
      catch (Exception e)
      {
          envLookupResult2 = "FAIL: "+e;
      }
      envResult3 = (minAmount==null?"FAIL":"avgAmount="+avgAmount.toString());
      try
      {
          InitialContext ic = new InitialContext();
          envLookupResult3 = "java:comp/env/com.acme.AnnotationTest/avgAmount="+ic.lookup("java:comp/env/com.acme.AnnotationTest/avgAmount");
      }
      catch (Exception e)
      {
          envLookupResult3 = "FAIL: "+e;
      }
      
      
      
       try
       {
           InitialContext ic = new InitialContext();
           dsLookupResult = "java:comp/env/com.acme.AnnotationTest/myDatasource="+ic.lookup("java:comp/env/com.acme.AnnotationTest/myDatasource");
       }
       catch (Exception e)
       {
           dsLookupResult = "FAIL: "+e;
       }
       
       txResult = (myUserTransaction==null?"FAIL":"myUserTransaction="+myUserTransaction);
       try
       {
           InitialContext ic = new InitialContext();
           txLookupResult = "java:comp/env/com.acme.AnnotationTest/myUserTransaction="+ic.lookup("java:comp/env/com.acme.AnnotationTest/myUserTransaction");
       }
       catch (Exception e)
       {
           txLookupResult = "FAIL: "+e;
       }
    }
    
    @PreDestroy
    private void myPreDestroyMethod()
    {
        System.err.println("PreDestroy called");
    }
    
    public void init(ServletConfig config) throws ServletException
    {
        super.init(config);
    }

    
    
    /* ------------------------------------------------------------ */
    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
    {
        doGet(request, response);
    }

    /* ------------------------------------------------------------ */
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
    {      
        try
        {
            response.setContentType("text/html");
            ServletOutputStream out = response.getOutputStream();
            out.println("<html>");
            out.println("<h1>Jetty6 Annotation Results");
            out.println("<body>");
            
            out.println("<h2>@PostConstruct Callback");
            out.println("<pre>");
            out.println("@PostConstruct");
            out.println("private void myPostConstructMethod ()");
            out.println("{}"); 
            out.println("</pre>");
            out.println("<br/>Result: "+postConstructResult+"");
           
            
            out.println("<h2>@Resource Injection for DataSource");    
            out.println("<pre>");         
            out.println("@Resource(mappedName=\"jdbc/mydatasource\");");
            out.println("public void setMyDatasource(DataSource ds)");
            out.println("{");
            out.println("myDS=ds;");
            out.println("}");
            out.println("</pre>");
            out.println("<br/>Result: "+dsResult+"");
            out.println("<br/>JNDI Lookup Result: "+dsLookupResult+"");

            
            out.println("<h2>@Resource Injection for env-entry ");
            out.println("<pre>");
            out.println("@Resource(mappedName=\"maxAmount\")");
            out.println("private Double maxAmount;");
            out.println("@Resource(name=\"minAmount\")");
            out.println("private Double minAmount;");
            out.println("</pre>");
            out.println("<br/>Result: "+envResult+": "+(maxAmount.compareTo(new Double(55))==0?" PASS":" FAIL")+"");     
            out.println("<br/>JNDI Lookup Result: "+envLookupResult+"");
            out.println("<br/>Result: "+envResult2+": "+(minAmount.compareTo(new Double("0.99"))==0?" PASS":" FAIL")+"");     
            out.println("<br/>JNDI Lookup Result: "+envLookupResult2+"");
            out.println("<br/>Result: "+envResult3+": "+(avgAmount.compareTo(new Double("1.25"))==0?" PASS":" FAIL")+"");     
            out.println("<br/>JNDI Lookup Result: "+envLookupResult3+"");          
         
            out.println("<h2>@Resource Injection for UserTransaction ");
            out.println("<pre>");
            out.println("@Resource(mappedName=\"UserTransaction\")");
            out.println("private UserTransaction myUserTransaction;");
            out.println("</pre>");
            out.println("<br/>Result: "+txResult+"");
            out.println("<br/>JNDI Lookup Result: "+txLookupResult+"");
            
            out.println("<h2>@RunAs");
            boolean result = request.isUserInRole("special");
            out.println("<br/>Result: isUserInRole(\"special\")="+result+":"+(result==true?" PASS":" FAIL")+"");    
            result = request.isUserInRole("other");
            out.println("<br/>Result: isUserInRole(\"other\")="+result+":"+ (result==false?" PASS":" FAIL")+"");
            
            
            out.println("</body>");            
            out.println("</html>");
            out.flush();
        }
        catch (Exception e)
        {
            throw new ServletException(e);
        }
    }
    

  
   
}