<%@page import="java.util.*" %> <%@page contentType="text/html" pageEncoding="UTF-8"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>JSP display all parameters</title> </head> <body> <% // you can get an enumeratable list // of parameter keys by using request.getParameterNames() Enumeration en = request.getParameterNames(); // enumerate through the keys and extract the values // from the keys! while (en.hasMoreElements()) { String parameterName = (String) en.nextElement(); String parameterValue = request.getParameter(parameterName); out.println(parameterName+":"+parameterValue+"<br />"); } // now call your jsp file (from a browser and add on some paramters) // file.jsp?a=12341234&b=apple&c=1.21gigawatts %> </body> </html> <!-- output: a:12341234 b:apple c:1.21gigawatts -->
Showing posts with label Enumeration. Show all posts
Showing posts with label Enumeration. Show all posts
Tuesday, October 20, 2009
JSP - list all parameter keys and values
Thursday, September 24, 2009
Java - find the working directory
import java.util.*; public class Main { public static void main(String[] args) { // to find out where your application is running // (sounds easy but its sometimes tricky) System.out.println("This Java applications working directory is:"); // Java has a list of Properties that it uses for everything // the working directory property is user.dir // you can check it out with: System.out.println(System.getProperty("user.dir")); // you can see all the properties with this: System.out.println(System.getProperties()); // it will just dump them all out in a not // organized way // you can also iterate through all of the properties // and print them out line by linewith: Properties myProps = System.getProperties(); for (Enumeration e = myProps.keys(); e.hasMoreElements();/**/){ String key = (String)e.nextElement(); String value = myProps.getProperty(key); System.out.println(key + " = " + value); } } }
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