FileDocCategorySizeDatePackage
LifeCycleServlet.javaAPI DocExample3559Thu Dec 15 20:48:38 GMT 2005com.oreilly.jent.servlets

LifeCycleServlet

public class LifeCycleServlet extends HttpServlet
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.

Fields Summary
int
timesAccessed
Constructors Summary
Methods Summary
public voiddestroy()


    // Write the Integer to a file
    File r = new File("./data/counter.dat");
    DataOutputStream dout = null;
    try {
      dout = new DataOutputStream(new FileOutputStream(r));
      dout.writeInt(timesAccessed);
    }
    catch(IOException e) {
      // This should be logged
    }
    finally {
      try { dout.close(  ); } catch (IOException ignored) {}
    }
public voiddoGet(javax.servlet.http.HttpServletRequest req, javax.servlet.http.HttpServletResponse resp)


    resp.setContentType("text/html");
    PrintWriter out = resp.getWriter(  );

    timesAccessed++;

    out.println("<html>");
    out.println("<head>");
    out.println("<title>Life Cycle Servlet</title>");
    out.println("</head><body>");

    out.println("I have been accessed " + timesAccessed + " time[s]");
    out.println("</body></html>");
public voidinit(javax.servlet.ServletConfig conf)


    super.init(conf);

    // Get initial value
    try {
      timesAccessed = Integer.parseInt(getInitParameter("defaultStart"));
    }
    catch(NullPointerException e) {
      timesAccessed = 0;
    }
    catch(NumberFormatException e) {
      timesAccessed = 0;
    }

    // Try loading from the disk
    DataInputStream ds = null;
    try {
      File r = new File("./data/counter.dat");
      ds = new DataInputStream(new FileInputStream(r));
      timesAccessed = ds.readInt(  );
    }
    catch (FileNotFoundException e) {
      // Handle error
    }
    catch (IOException e) {
      // This should be logged
    }
    finally {
      if (ds != null)
         try {
             ds.close();
         } catch (IOException ignored) {}
    }