hello.java

51单片机实验指导

/**
 * The template of this project can be modified in the directory
 * \JCreator Pro\Template\Template_4
 *
 */
 
package mypackage;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


/**
 * Servlet Hello application
 *
 * @author 
 * @version 1.00 03/09/14
 *
 * Simple servlet to validate that the Hello World example can
 * execute servlets.  In the web application deployment descriptor,
 * this servlet must be mapped to correspond to the link in the
 * "index.html" file.
 *
 * This project requires to have Tomcat and ANT installed.
 *
 */
 
public final class Hello extends HttpServlet {

    private String name = null;
    
    /** Called when the form is filled in by the user. */
    public void doGet(HttpServletRequest request, HttpServletResponse response)
        throws IOException, ServletException
    {
        response.setContentType("text/html");
        
        // Get the name field from the form.
        String name = request.getParameter("name");
        
        // If the name is null then servlet is shown for the first time.
        if (name != null) this.name = name;
        
        // Print the html code of the web page
        PrintWriter out = response.getWriter();
        
        if(name == null || name.length() == 0)
        {
            out.println("<b>Enter your name and press submit!</b>");
            out.println("<form action=\"helloworld.jsp\" method=GET>");
            out.println("Your name:");
            out.print("<input type=text size=20 name=name");
            if (name != null) out.print(" value=\""+name+"\"");
            
            out.println(">");
            out.println("<input type=submit value=Submit>");
            out.println("</form>");
        }
        else // Print hello message
        {
            out.print("<b> Hello ");
            out.print(name);
            out.println("!</b>");
            name = null;
        }
    }
}