Reading a properties file in a servlet and passing its contents to a JSP pa

Hi all,
I'm totally new to Servlet pgmg n JSP. Please can ne1 tell how to read a simple properties file (in a servlet) and pass its contents to a JSP page.Actually the reason is to fill a combo box in a JSP page with the contents of a properties file.If calling a servlet for the same is d best way to do that, plz can ne1 tell me :
1> whether to override the doPost method in the servlet in which to read d file using FileInputStream
2> Putting the contents in an array and then how to pass this array to the JSP page.
Thanks,
deepthy.

I'm using a properties file to let my web application know what the name of the database is. I'm using an abstract class GeneralDao which will be extended by all the DAO's (Data Access Objects or java classes containing SQL statements).
Here's the code :
protected Connection getDatabaseConnection()
          throws Melding
     Connection dbconn = null;
     ResourceBundle resBundle;
     try
     Class.forName("com.mysql.jdbc.Driver").newInstance();
     resBundle = ResourceBundle.getBundle("gcoConfig");
     String dbConnectie = resBundle.getString("databaseconnection");
     gcoLogger.debug("lezen databaseconnection in resourceBundle " );
     dbconn = DriverManager.getConnection(dbConnectie);
     } catch (InstantiationException exc)The ResourceBundle is used to read the properties file, named gcoConfig.properties.
With the getString() command I read the content of the string named databaseconnection.
The gcoConfig.properties file is placed inside the folder C:\Program Files\Apache Software Foundation\Tomcat 5.0\webapps\gco\WEB-INF\classes
The GeneralDao is placed in the folder C:\Program Files\Apache Software Foundation\Tomcat 5.0\webapps\gco\WEB-INF\classes\org\gertcuppens\cluifDao.
So this class is placed some folder below the WEB-INF\classes folder of gcoConfig.properties.
And the content of the properties file is just one line :
databaseconnection=jdbc:mysql://localhost/cluif
If you want to let the JSP know what's inside the properties file, wrap the content in a Javabean, put it in the request or even the session and pass the control to the JSP.

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Help: Servlet can't read from properties file

I am working on a web application running in Tomcat on Linux.My java source file reads some parameters from a properties file (data.properties)in the same directory. This works well in a simple application. However, if it is used in the Tomcat environment, it can't be read by a servlet file (LoginServlet.java). I put both the "LoginServlet.class" and "data.properties" in the following directory: /webapps/myapp/WEB-INF/classes. When I run the web application in Tomcat, the error is "data.properties not found". What is the problem? Do I need to modify my "web.xml" and/or Tomcat's "server.xml"? If so, how to modify them?
This web application contains a lot of serlets. So I don't want to hardcode the parameters into the servlet codes.
Any info will be appreciated. Thanks in advance!:)

Putting the properties file in webapps/myapp may or may not help.
My assumption is that you are trying to open the file by brute force, with something like
InputStream propis = new FileInputStream ("data.properties");
Properties props = new Properties ( );
props.load (propis);
What you want is to have the class loader find a file in the same place as the class file, and give you back an input stream reading from that file, which you can then pass to the Properties.load(InputStream) method. This is called a "resource," and the way to do it is:
InputStream propis = getServletContext().getResourceAsStream("data.properties");
// remaining code as above
This will cause the class loader for the servlet context (a/k/a the Web application) to find the file in the same manner as it might find a class, but instead of treating it as compiled JVM code, and loading it, it simply passes you back an InputStream from which you do whatever you want.
Cheers!
Jerry Oberle
perl -e 'printf "mailto%cg%s%cearthlink%cnet\n", 58, "oberle", 64, 46;'

Can a servlet read a jsp file and display its contents?

Hi,
I would like to know if Servlets can read a Jsp file and display its contents.. Right now for our website, I am using a html file to be displayed after a successful post operation through the Servlets...
-Thanks!

I posted this in another thread.
Here's some code that reads using a URL. This doesn't work with JSPs as the server executes JSP when it connects but it's useful for other file types. Note that the filename is a URI</h1>This is <code>show.jsp</code></h1>
<hr>
<%! String file = null; %>
<%! java.io.InputStream is = null; %>
<%
file = request.getParameterValues("filename")[0];
try {
is = (new java.net.URL(file)).openStream();
} catch (java.io.IOException ioe) { out.write(file + " not found!<br>"); }
java.io.BufferedReader in = new java.io.BufferedReader(new java.io.InputStreamReader(is));
String line = "";
%>
<pre>
<%
while((line = in.readLine()) != null) {
%>
<%=line%>
<%
%>
</pre>

How do I read a properties file in WEB-INF without hard-coding a path?

Hello,
How do I read a properties file in WEB-INF without hard-coding a path?
I tried:
Properties properties = new Properties();
properties.load(new FileInputStream("db.properties"));
driver = properties.getProperty("driver");
but it cannot find the db.properties file.
Thanks for the help.
Frank

Don't use a File to read those properties.
Better to use the servlet context and
getResourceAsStream() method to get the InputStream.
It'll look for any file in the CLASSPATH. If you put
that properties file in the WEB-INF/classes directory
you'll have no problems, even if you deploy with a
WAR file.Completely agree with this approach. Just have to mention the following for completeness
according to the API,
"This method is different from java.lang.Class.getResourceAsStream, which uses a class loader. This method allows servlet containers to make a resource available to a servlet from any location, without using a class loader. "
So using this method, the resource can be anywhere under your web context, not just in the classpath.
Cheers,
evnafets

How to read the properties file available in Server File structure in webdy

hi all,
I have developed one webdynpro application. In this application i need to access mdm server to continue. For getting the connection i need to pass the IP addresses.
Can i have code how to read the properties file which is residing in the server file. with out included along with the application. keeping some where in the file structure in the server. I want to read that properties file by maintain the iP addresses and users in properties file based on the key i want to read like below.
servername="abcServer"
username="john"
password="test123"
Please send me the code how to read this properties file from the file structure and how to read this values by key in webdynpro application
Regards
Vijay

Hi Vijay,
You can try this piece of code too:
Properties props = new Properties();
//try retrieve data from file
//catch exception in case properties file does not exist
try {
         props.load(new FileInputStream("c:\property\Test.properties")); //File location
         String serverName = props.getProperty("servername"); //Similarly, you can access the other properties
         if(serverName==null)
           //....do appropriate handling
     }     catch(IOException e)
               e.printStackTrace();
Regards,
Alka.

Read a Properties File in a Static Floating Block

I am trying to read a properties file in a static floating block:
   static
      try
         Properties p = new Properties();
         String path = "/WEB-INF/classes";
         InputStream is = getClass().getResourceAsStream( path + "artimus_message_MessagInboxConfig.properties" );
         p.load(is); // load the stream into the Properties object
         WEBSITE_HOME = p.getProperty( "WEBSITE_HOME" );
         setWebSiteHome( WEBSITE_HOME );
      catch { ......}
   }I got a compilation error saying that the non-static method getClass() cannot be referenced from a static context. There is almost no way to make this static floating block non-static. What should I do?

Thanks for the reply. But, huh... I do not quite
understand. Which class is MyClass?It's a generic placeholder for whichever class your put that block into. You wouldn't put it there literally--replace it with the name of the actual class. If that block is in Foo.java, then use Foo.class instead of MyClass.class.
>
Okay, this static floating block is in a class called
MessageInboxConfig.java. Then use MessageInboxConfig.class.getResourceAsStream(...)
And inside this static
floating block, I am reading a properties file and
this properties file is in the
ContextRoot/WEB-INF/classes/artimus_message_MessagInbox
onfig.propertiesHow do I read this properties file?
Properties p = new Properties();
InputStream is = MessageInboxConfig.class.getResourceAsStream("artimus_message_MessagInboxConfig.properties" );
... etc. ...You shouldn't need to specify "WEB-INF/classes," since it should be in your classpath. What you pass to getResource is a path relative to a directory in your classpath.

How can load properties file for one time and use in entire application

Hi folks,
I dont want to read properties file every time , and want to get property value in any servelet or jsp page.(means i want to read only property file only for once and want to get value in any where ) , how to do this.
Message was edited by:
RajeshwarReddyT

means we have to read file every time Know but i dont
want to be happen that ??? No you don't . You read the file once. You store it in the hashmap. Then you hand that hashmap to whatever class needing the data.
getProperties() returns the hashmap, doesn't read the file.
Maybe I should have called the method getMap or something.
Message was edited by:
karma-9

How to read from properties file

Hi,
I am using JSR 168.
while creating a new portlet, a folder gets created with the name as "portlet". Under which is resource package and <PortletName>Bundle.java.
pls tell me how to read from .properties file.
waiting eagerly for some reply
Thanks & Regards,
HP
Edited by: user9003827 on Apr 13, 2010 3:42 AM

I think i have mixed it up :)
I have looked at it again and believe you are using regular JSP portlets.
Can you tell what you want to achieve by reading .properties file. Are you meaning the preferences of the portlet or what exactly are you trying to do?
Reading propertie files is easy:
// Read properties file.
Properties properties = new Properties();
try {
properties.load(new FileInputStream("filename.properties"));
String myKey = properties.getProperty("yourKey");
} catch (IOException e) {
}Edited by: Yannick.O on 13-Apr-2010 05:52

URGENT.........File Upload using Servlets and jsp

I am a new servlet programmer.......
iam using tomcat server......
can any one pls help in writing code for file upload using servlets and jsp without using multipart class or any other class like that....
Please URGENT..

Slow down! "Urgent" is from your perspective alone. I, myself, am not troubled or worried in the least.
hi ugniss
thanks for ur reply....sorry i was not
y i was not asked not to use multipart class or any
other class like that...is there any other
possibility to do file uploading from jsp to
servlet...
Just as an aside, a JSP is a Servlet. But even if I move beyond that, the question does not make sense. If you want a "JSP to upload to a Servlet", then simply do so in memory. You are still (likely) within the same scope of a given request. However, if instead you are referring to a JSP that is displayed on a browser, then really you are talking about HTML, which is what the browser will receive. And since you are now talking about a browser, your only real, viable option is a multi-part file upload. So, it is either server or it is browser. And either way, the question leads to very established options, as outlined above.
the main concept is.. in the browser the user selects
a particular file and clicks the button upload..after
clicking upload the jsp should sent the file to the
servlet in streams...there the servlet gets in and
saves in a server location........this is wat i hav
to do...
Okay. So, after reading my previous (redundant) paragraph, we have arrived at the crux of the issue. You have a JSP that will be output as HTML to a client (browser) which you want to upload content to your server (handled by a Servlet). So, you are now stuck again with multi-part. The requirement to not use multi-part is non-sensical. You can overcome it, say, if you write your own applet or standalone Swing client. However, if your users are invoking this functionality from a browser, you are limited by the options that W3C has provided you. Use multi-part.
is there aby possibilty to do this.....can any one
pls help....Take the advice to download and review Jakarta Commons FileUpload. Inform your management that their requirement makes no technical sense. Research on your own. There are dozens of examples (and tutorials) on file upload using multi-part. Embrace it. Live it. Love it.
- Saish

I got ZipException to read Jndi.Properties file

hello friends,
here i got ZipException to get Jndi.Properties file.
i place Jndi.Properties file in my directory and i set classpath to weblogic.jar&Jndi.Properties file.
but i didn't get InitialContext obj.though i got zipException.
jvm displays Jndi.Properties file is not read.

To try out I pasted the code given by u in my application as a demo
     private static Connection connect() throws Exception{
     InputStream in = QueryTest.class.getResourceAsStream("JDBC.properties");
          Properties props = new Properties();
          props.load(in);
          //in.close();
          String driver = props.getProperty("JDBC.driver");
          System.out.println(driver);
          String url = props.getProperty("JDBC.url");
          System.out.println(url);
          String user = props.getProperty("JDBC.user");
          System.out.println(user);
          String pwd = props.getProperty("JDBC.password");
          System.out.println(pwd);
          in.close();
          Class.forName(driver);
          return DriverManager.getConnection(url, user, pwd);
     public static void main(String[] args) throws Exception{
          Connection con = connect();
          //Put your code here
JDBC.properties file is
     url = jdbc:mysql://localhost:3306/mysql
          user= root
               password =password
               driver=com.mysql.jdbc.Driver
And the error messages are
null
null
null
null
Exception in thread "main" java.lang.NullPointerException
     at java.lang.Class.forName0(Native Method)
     at java.lang.Class.forName(Unknown Source)
     at Generic.QueryTest.connect(QuerryTest.java:28)
     at Generic.QueryTest.main(QuerryTest.java:35)

Java.lang.NullPointerException   in the code to read a properties file

I have written the following code to read a properties file...........
<b>
public Property(String fileName)
    try
       InputStream is = MyClassName.class.getClass().getClassLoader().getResourceAsStream(fileName);
       prop.load(is);
       is.close();
    catch (Exception ex)
        System.out.println("The Exception is:        " + ex.getMessage());
        ex.printStackTrace();
</b>
But this code is giving <b> java.lang.NullPointerException </b> at <b> prop.load(is) </b>
please help me....
regards
Brahmachaitanya

hi,
    If you are loading a resource (property) file from a jar file you can use
getResourceAsStream("com/test/test.properties").
    if the propery file is in outside of your jar file . you can use
Property portalProps = new Property ();
try {
               FileInputStream fileInputStream = new FileInputStream("<FilePath + FileName>");
               portalProps.load(fileInputStream);
               fileInputStream.close();
          } catch (IOException e) {
               //Log the error
refer the following link for more details
http://www.javaworld.com/javaworld/javaqa/2003-08/01-qa-0808-property.html

I have made .indd file with some form fields in it, now haw to read these fields and manipulate its content through script in indesign

I have made .indd file with some form fields in it, now haw to read these fields and manipulate its content through script in indesign

It's probably best to ask in the InDesign Scripting forum:
InDesign Scripting

How to create a file and store its contents into another file?

Hi,
I'm having some trouble trying to create a code where I have to to create a file and store its contents into another file?
I read the API, but I'm not certain how this file thing works.
Here's my code so far:
public static void main(String[] args) throws Exception
          File file = new File("tasks.txt");
          if (file.exists())
               System.out.println("File already exists");
               System.exit(0);
          Scanner scan = new Scanner(System.in);
          Scanner scan2 = new Scanner(System.in);
          //Scans the input line by line
          scan.useDelimiter("\\n");
          //Scans the input by tabs
          scan2.useDelimiter("\\t");
          PrintWriter outputs = new PrintWriter("newtasks.txt");
          outputs.print("ok");
          outputs.println(3);
          outputs.close();
     }

I managed to change my text into uppercase, but how do I store the uppercase content into another file.
-So this is what I did so far, I took a text file and modified its strings to uppercase.
-Now I need to put those modified strings into another text file, is there a way where I can do that with my current code?
-I already tried printwriter, but it doesn't seem to work
public static void main(String[] args)throws IOException
          //Task[] oneHundredTasks = new Task[100];
          String uppercase;
          String combine;
          Scanner scan = null;
          FileInputStream in = null;
        FileOutputStream out = null;
        PrintWriter output = null;
        try
             scan = new Scanner(new BufferedReader(new FileReader("tasks.txt")));
             scan.useDelimiter("\\n");
             scan.useDelimiter("\\t");
            while (scan.hasNext())
                 if(!scan.hasNext())
                      scan.next();
                 combine = scan.next();
                 uppercase = combine.toUpperCase();
                 System.out.println(uppercase);
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            if (scan != null)
                scan.close();
        //The program will try the input and output files
        try
             in = new FileInputStream("tasks.txt");
            out = new FileOutputStream("newtasks.txt");
            int c;
            //The number "-1" is used to indicate that it has reached the end of the stream.
            while ((c = in.read()) != -1)
                out.write(c);
        finally
            if (in != null)
                in.close();
            if (out != null)
                out.close();
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How to browse a file and extract its contents

i want to browse a file and extract its contents.My code is given below but its not working .Can anybody help me please
JFileChooser fc = new JFileChooser();
          int returnVal = fc.showOpenDialog(jfrm);
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          fileName=file.getName();
          //This is a file function to extract data from a file.
          //It reads data from a file that can be viewed on cmd
          jlab3.setText(fileName);
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// command line parameter
FileInputStream fstream = new FileInputStream(fileName);
// Convert our input stream to a
// DataInputStream
          DataInputStream in =new DataInputStream(fstream);
// Continue to read lines while
// there are still some left to read
// while (in.available() !=0)
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catch (Exception e)
          System.err.println("File input error");
          }

JFileChooser fc = new JFileChooser();
int returnVal = fc.showOpenDialog(jfrm);
if (returnVal == JFileChooser.APPROVE_OPTION)
File file = fc.getSelectedFile();
//This is where a real application would open the file.
fileName=file.getName();
//This is a file function to extract data from a file.
//It reads data from a file that can be viewed on cmd
jlab3.setText(fileName);
try
// Open the file that is the first
// command line parameter
FileInputStream fstream = new FileInputStream(fileName);
// Convert our input stream to a
// DataInputStream
DataInputStream in =new DataInputStream(fstream);
// Continue to read lines while
// there are still some left to read
// while (in.available() !=0)
// Print file line to screenHere you are reading the first line of the file
fileName1=in.readLine();
//}and here you are displaying the line in a (I suppose) JLabel. A JLabel is not very suitable for displaying a file content, except is the file contain few characters !!!
jlab3.setText(fileName1);
in.close();
catch (Exception e)
System.err.println("File input error");
}If you want to read the complete file content you must uncomment lines inside while instruction, like this
while (in.available() > 0) { // I prefer to test in.available like this, instead of !=
// append text to a StringBuffer (variable named sb here) or directly in a textarea.
sb.append(in.readLine());
...

Upload 2 files and compare its contents

Hi guys,
I want to upload 2 files in SAP and compare its contents.
How am i going to do that?
Please provide sample code... Thanks a lot!
rgds,
Mark

Hi Mark,
I expected to use this code, once u can try this code.
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IF sy-subrc = 0.
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                  gwa_output2-flag
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Reading a properties file in a servlet and passing its contents to a JSP pa

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