package com.oreilly.jent.people.servlet;
/**
* In general, you may use the code in this book in your programs and
* documentation. You do not need to contact us for permission unless
* you're reproducing a significant portion of the code. For example,
* writing a program that uses several chunks of code from this book does
* not require permission. Selling or distributing a CD-ROM of examples
* from O'Reilly books does require permission. Answering a question by
* citing this book and quoting example code does not require permission.
* Incorporating a significant amount of example code from this book into
* your product's documentation does require permission.
*
* We appreciate, but do not require, attribution. An attribution usually
* includes the title, author, publisher, and ISBN. For example:
*
* "Java Enterprise in a Nutshell, Third Edition,
* by Jim Farley and William Crawford
* with Prakash Malani, John G. Norman, and Justin Gehtland.
* Copyright 2006 O'Reilly Media, Inc., 0-596-10142-2."
*
* If you feel your use of code examples falls outside fair use or the
* permission given above, feel free to contact us at
* permissions@oreilly.com.
*/
import java.io.IOException;
import java.io.PrintWriter;
import java.util.logging.Logger;
import javax.ejb.CreateException;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.oreilly.jent.people.InvalidSearchException;
import com.oreilly.jent.people.PersistenceException;
import com.oreilly.jent.people.Person;
import com.oreilly.jent.people.PersonDAO;
import com.oreilly.jent.people.SearchArg;
import com.oreilly.jent.people.ejb.PeopleFinderLocal;
import com.oreilly.jent.people.ejb.PeopleFinderLocalHome;
public class PeopleFinderServlet extends HttpServlet {
// Logger for this class
private Logger mLog =
Logger.getLogger(PeopleFinderServlet.class.getName());
/**
* Default constructor.
*/
public PeopleFinderServlet() {
super();
}
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws IOException, ServletException {
handleRequest(req, resp);
}
public void doPost(HttpServletRequest req, HttpServletResponse resp)
throws IOException, ServletException {
handleRequest(req, resp);
}
/** Main request handler, invoked from doGet() and doPost() methods */
private void handleRequest(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
Person[] people = new Person[0];
String error = null;
// Convert the tag's attributes into a set of SearchArgs
SearchArg[] sargs = new SearchArg[3];
sargs[0] = new SearchArg();
sargs[0].setName(PersonDAO.FIRST_NAME);
sargs[0].setValue(request.getParameter("firstName"));
sargs[1] = new SearchArg();
sargs[1].setName(PersonDAO.LAST_NAME);
sargs[1].setValue(request.getParameter("lastName"));
sargs[2] = new SearchArg();
sargs[2].setName(PersonDAO.EMAIL);
sargs[2].setValue(request.getParameter("email"));
// Get the PeopleFinder EJB home
try {
Context ctx = new InitialContext();
PeopleFinderLocalHome home =
(PeopleFinderLocalHome)ctx.lookup("java:comp/env/ejb/PeopleFinder");
PeopleFinderLocal finder = home.create();
people = finder.findPeople(sargs);
}
catch (NamingException ne) {
error = "Failure accessing EJB component";
mLog.severe("Failed to locate/access EJB component: " + ne.getMessage());
}
catch (CreateException ce) {
error = "Failure accessing EJB component";
mLog.severe("Failed to create EJB component: " + ce.getMessage());
}
catch (InvalidSearchException ise) {
error = "Invalid search parameters.";
mLog.severe("Search parameters were invalid: " + ise.getMessage());
}
catch (PersistenceException pe) {
error = "Failure accessing data source";
mLog.severe("Persistence error during search: " + pe.getMessage());
}
// Output HTML results
PrintWriter out = response.getWriter();
// Print the header
out.println("<HTML><HEAD><TITLE>Search Results</TITLE></HEAD><BODY>");
// If there's an error, just print it, prefaced with "Error:".
if (error != null) {
out.println("<center><h3>Error: " + error + "</h3></center>");
}
// If there are no results, print a notice to that effect
else if (people.length == 0) {
out.println("<center><h3>No matching people found.</h3></center>");
}
// Otherwise, print the results, one person per row, in a table
else {
// Open the table
out.println("<center><table border=\"0\">");
out.println("<tr bgcolor=\"#CCCCCC\">");
out.println("<th>Last name</th>");
out.println("<th>First name</th>");
out.println("<th>Email addresses</th></tr>");
// Print each person's data
for (int i = 0; i < people.length; i++) {
Person p = people[i];
// Use our util method to convert the person
// data into an HTML fragment
out.println(personToHTML(p));
}
out.println("</table>");
}
// Close the page
out.println("</BODY></HTML>");
}
/**
* Convert a Person's data into a row in the table on the results page.
* Note that this utility assumes a particular structure to the results
* page (a table with so many columns, with a particular order to the
* data in the columns, etc.)
*/
static protected String personToHTML(Person p) {
StringBuffer buf = new StringBuffer();
buf.append("<tr bgcolor=\"#EEEEEE\">");
buf.append("<td>" + p.getLastName() + "</td>");
buf.append("<td>" + p.getFirstName() + "</td>");
buf.append("<td>");
for (int i = 0; i < p.getEmailAddresses().length; i++) {
buf.append(p.getEmailAddresses()[i]);
if (i < p.getEmailAddresses().length - 1) {
buf.append("<br>");
}
}
buf.append("</td>");
buf.append("</tr>");
return buf.toString();
}
}
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