Solved

How to add to .properties file for a servlet?

Posted on 2002-06-18
11
166 Views
Last Modified: 2010-04-01
I'm kind of new in writing the servlets, and I have a question, I'm using tomcat 4.0, and I want to add a default property of age=30; for my servlet. How do I add this to the .properties file? To which .properties file do I add this to?
Can someone give me a really detailed step by step procedure please?
thanks.
0
Comment
Question by:tomboman
11 Comments
 
LVL 92

Expert Comment

by:objects
ID: 7091733
You can add it to your servlet definition in web.xml:

<servlet>
  <servlet-name>MyServlet</servlet-name>
  <servlet-class>au.com.objects.MyServlet</servlet-class>
    <init-param>
      <param-name>age</param-name>
      <param-value>30</param-value>
    </init-param>
</servlet>
0
 
LVL 92

Expert Comment

by:objects
ID: 7091735
You can then access it from your servlet using the getInitParameter method.

int age = Integer.parseInt(getInitParameter("age"));
0
 
LVL 6

Expert Comment

by:kotan
ID: 7091808
Properties file method:

Let's say the properties file is name.properties which contain

age=30


Place that properties under  {Your webapps}/WEB-INF/classes/

In the servlet,

import java.util.ResourceBundle;


ResourceBundle rb = ResouceBundle.getBundle("name");
int age = Integer.parseInt(rb.getString("age"));
0
Live: Real-Time Solutions, Start Here

Receive instant 1:1 support from technology experts, using our real-time conversation and whiteboard interface. Your first 5 minutes are always free.

 
LVL 19

Accepted Solution

by:
cheekycj earned 50 total points
ID: 7092746
I use Properties API to read properties files not the resourcebundle.. here is the code for that (just an alternative):

using the same convention as above your properties file will contain:
age=30

    java.util.Properties properties = new java.util.Properties();
    try {
        // reading in properties file
        properties.load(new java.io.FileInputStream("yourpropertyfilename.properties"));
    } catch (IOException e) {
        // handle IO exception
    }
    // now you can fetch and retrieve any number of values
    int age;
    try {
      // retrieve age property (all properties are retrieved as string values
      String ageProp = properties.getProperty("age");
      if (ageProp != null) {
        // get integer value from the retrieved string
        age = Integer.parseInt(ageProp);
      }
      else {
        // print out that age property was not found/stored
      }
    } catch (NumberFormatException nfe) {
        // handle any number format exception in case age value is not an int
    }

HTH,
CJ
0
 

Author Comment

by:tomboman
ID: 7095568
Thanks. CJ. and others.
0
 
LVL 19

Expert Comment

by:cheekycj
ID: 7096250
Glad I could help and Thanx for the "A".

CJ
0
 
LVL 92

Expert Comment

by:objects
ID: 7097490
Picked the least platform independant solution though.

0
 
LVL 19

Expert Comment

by:cheekycj
ID: 7098828
objects: why do you say that?

The Properties API works in Windows.  I have used it.

CJ
0
 
LVL 92

Expert Comment

by:objects
ID: 7099722
Becuase you need to specify the location of the the properties file on disk. If you move your webapp then this location may well change, and require a code change.
0
 
LVL 19

Expert Comment

by:cheekycj
ID: 7100791
true.  But you can keep your prop file under the classes directory, you can include as a part of your deployment process.

I just find it easier to maintain a simple prop file that I can replace easily.

CJ
0
 
LVL 92

Expert Comment

by:objects
ID: 7101145
> But you can keep your prop file under the classes directory

If you install tomcat in a different directory, or move your webapp the the directory will change.

> I just find it easier to maintain a simple prop file that I can replace easily.

That's fine, just more portable to use the classloader to open it.
0

Featured Post

Courses: Start Training Online With Pros, Today

Brush up on the basics or master the advanced techniques required to earn essential industry certifications, with Courses. Enroll in a course and start learning today. Training topics range from Android App Dev to the Xen Virtualization Platform.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Employees depend heavily on their PCs, and new threats like ransomware make it even more critical to protect their important data.
For months I had no idea how to 'discover' the IP address of the other end of a link (without asking someone who knows), and it drove me batty. Think about it. You can't use Cisco Discovery Protocol (CDP) because it's not implemented on the ASAs.…
This video shows how to quickly and easily add an email signature for all users on Exchange 2016. The resulting signature is applied on a server level by Exchange Online. The email signature template has been downloaded from: www.mail-signatures…
Nobody understands Phishing better than an anti-spam company. That’s why we are providing Phishing Awareness Training to our customers. According to a report by Verizon, only 3% of targeted users report malicious emails to management. With compan…

786 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question