Bean Parser Servlet


import java.io.IOException;  
import java.io.PrintWriter;     

import javax.servlet.*;
import javax.servlet.http.*;

public class BeanParserServlet extends HttpServlet {
    
  public void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, java.io.IOException {
    
  //set the MIME type of the response, "text/html"
    response.setContentType("text/html");
  
  //use a PrintWriter send text data to the client who has requested the servlet
    java.io.PrintWriter out = response.getWriter();
  
  //Begin assembling the HTML content
    out.println("<html><head>");
    
    out.println("<title>Stock Price Fetcher</title></head><body>");
    out.println("<h2>Please submit a valid stock symbol</h2>");
   
   //make sure method="post" so that the servlet service method
   //calls doPost in the response to this form submit
    out.println(
        "<form method=\"post\" action =\"" + request.getContextPath() +
            "/stockbean\" >");

    out.println("<table border=\"0\"><tr><td valign=\"top\">");
    out.println("Stock symbol: </td>  <td valign=\"top\">");
    out.println("<input type=\"text\" name=\"symbol\" size=\"10\">");
    out.println("</td></tr><tr><td valign=\"top\">");

    out.println("<input type=\"submit\" value=\"Submit Info\"></td></tr>");
    out.println("</table></form>");
    out.println("</body></html>");
  
     } //end doGet
   
   public void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException,java.io.IOException{
     
  
  String symbol;//this will hold the stock symbol
  float price = 0f;
  
  symbol = request.getParameter("symbol");
  
  boolean isValid = (symbol == null || symbol.length() < 1) ? false : true;

  //set the MIME type of the response, "text/html"
    response.setContentType("text/html");
  
    //use a PrintWriter send text data to the client who has requested the servlet
    java.io.PrintWriter out = response.getWriter();
  
  //Begin assembling the HTML content
    out.println("<html><head>");
    out.println("<title>Latest stock value</title></head><body>");
  
  if (! isValid){
      out.println("<h2>Sorry, the stock symbol parameter was either empty or null</h2>");
  } else {
  
      out.println("<h2>Here is the latest value of "+ symbol +"</h2>");
      
    
    StockPriceBean spbean = new StockPriceBean();
    spbean.setSymbol(symbol);
    price = spbean.getLatestPrice();
    
    
      out.println( (price == 0 ? "The symbol is probably invalid." : ""+price) );
    
  }
  
    
  out.println("</body></html>");
  
    out.close();
  
  }// doPost
  
}//HttpServlet
Related examples in the same category

1.	Using Init Method Servlet
2.	Servlet parameter
3.	Post Handler
4.	Query Modifier
5.	Compression Response Stream servlets
6.	Compression Servlet Response Wrapper
Bean Parser Servlet : Basics « Servlets « Java

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