Example on getParameterValues() method of Servlet Request

The method getParameterValues() will generally came into picture if there is a chance of getting multiple values for any input parameter, this method will retrieve all of it values and store as string array.

Syntax

String[] values = getParameterValues(“Input Parameter”);

Directory Structure

Files Required

• index.html
• OngetParameterValues.java
• web.xml

index.html

<font face="verdana" size="2px">
     <form action="onGPV" method="post">
     Habits :
        <input type="checkbox" name="habits" value="Reading">Reading
        <input type="checkbox" name="habits" value="Movies">Movies
        <input type="checkbox" name="habits" value="Writing">Writing
        <input type="checkbox" name="habits" value="Singing">Singing
        <input type="submit" value="Submit">
     </form>
</font>

OngetParameterNames.java

package java4s;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class OngetParameterValues extends HttpServlet  
{
    protected void doPost(HttpServletRequest req,HttpServletResponse res)throws ServletException,IOException
    {
        PrintWriter pw=res.getWriter();
        res.setContentType("text/html");

        String[] values=req.getParameterValues("habits");
        pw.println("Selected Values...");    
        for(int i=0;i<values.length;i++)
       {
           pw.println("<li>"+values[i]+"</li>");
       }
       pw.close();    
    }
}

web.xml

<web-app>

    <servlet>
        <servlet-name>ongetParameterValues</servlet-name>
        <servlet-class>java4s.OngetParameterValues</servlet-class>
    </servlet>

    <servlet-mapping>
            <servlet-name>ongetParameterValues</servlet-name>
            <url-pattern>/onGPV</url-pattern>
    </servlet-mapping>

   <welcome-file-list>  
        <welcome-file>index.html</welcome-file>  
   </welcome-file-list> 

</web-app>

Output

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::. About the Author .::
		Sivateja Kandula - Java/J2EE Full Stack Developer Founder of Java4s - Get It Yourself, A popular Java/J2EE Programming Blog, Love Java and UI frameworks. You can sign-up for the Email Newsletter for your daily dose of Java tutorials.