82 lines
2.5 KiB
Java
82 lines
2.5 KiB
Java
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Servlet initialisation parameters
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package com.ack.web.servlet;
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import java.io.IOException;
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import java.io.PrintWriter;
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import java.util.Enumeration;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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/**
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* initialisation parameters inside the web.xml file
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<servlet>
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<servlet-name>initialisation</servlet-name>
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<servlet-class>com.ack.web.servlet.ServletInitialisationParameters</servlet-class>
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<init-param>
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<param-name>jdbcurl</param-name>
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<param-value>someurl</param-value>
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</init-param>
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<init-param>
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<param-name>password</param-name>
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<param-value>bah</param-value>
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</init-param>
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<init-param>
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<param-name>username</param-name>
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<param-value>foo</param-value>
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</init-param>
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</servlet>
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*/
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public class ServletInitialisationParameters extends HttpServlet {
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public void init() throws ServletException {
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String jdbcURL = getInitParameter( "jdbcurl" );
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String username = getInitParameter( "username" );
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String password = getInitParameter( "password" );
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try {
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if( jdbcURL == null || username == null || password == null ) {
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StringBuffer buf = new StringBuffer( "you must specify the " );
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buf.append( " 'jdbcurl', 'username', 'password' init params to -> " );
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buf.append( getClass().getName() + " within you web.xml file" );
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String msg = buf.toString();
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System.out.println( buf );
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// log( msg );
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// throw new ServletException( msg );
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}
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else {
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// possible get connection to database
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}
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}
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catch( Exception ex ) {
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log( ex.toString() );
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throw new ServletException( ex.toString() );
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}
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finally {
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// do any clean-up if you need to
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}
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log( "Completed Initialisation ->" + getClass().getName() );
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}
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public void doGet( HttpServletRequest req, HttpServletResponse res )
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throws ServletException, IOException {
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res.setContentType( "text/html" );
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PrintWriter pw = res.getWriter();
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pw.println( "<h3>Servlet Initialisation Parameters</h3>" );
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pw.println( "<p><hr noshade><p>" );
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Enumeration e = getInitParameterNames();
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while( e.hasMoreElements() ) {
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String paramName = (String) e.nextElement();
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pw.println( "Initialisation Parameter: [ " );
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pw.println( paramName + " = " + getInitParameter( paramName ) );
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pw.println( " ]<br>" );
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}
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}
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}
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