Currency Converter (CB)

Currency Converter/currency_converter.java

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+/*
+
+* To change this template, choose Tools | Templates
+
+* and open the template in the editor.
+
+*/
+
+package com.exchange;
+
+import java.io.*;
+
+import java.net.*;
+
+import java.util.*;
+
+import javax.servlet.*;
+
+import javax.servlet.http.*;
+
+import java.io.InputStream;
+
+import java.net.*;
+
+import com.google.gson.*;
+
+/**
+
+*
+
+* @author pakallis
+
+*/
+
+classRecv
+
+{
+
+private String lhs;
+
+private String rhs;
+
+private String error;
+
+private String icc;
+
+public Recv(
+
+{
+
+}
+
+public String getLhs()
+
+{
+
+return lhs;
+
+}
+
+public String getRhs()
+
+{
+
+return rhs;
+
+}
+
+}
+
+public classConvertextendsHttpServlet {
+
+/**
+
+* Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
+
+* @param request servlet request
+
+* @param response servlet response
+
+* @throws ServletException if a servlet-specific error occurs
+
+* @throws IOException if an I/O error occurs
+
+*/
+
+protected void processRequest(HttpServletRequest req, HttpServletResponse resp)
+
+throws ServletException, IOException {
+
+String query = "";
+
+String amount = "";
+
+String curTo = "";
+
+String curFrom = "";
+
+String submit = "";
+
+String res = "";
+
+HttpSession session;
+
+resp.setContentType("text/html;charset=UTF-8");
+
+PrintWriter out = resp.getWriter();
+
+/*Read request parameters*/
+
+amount = req.getParameter("amount");
+
+curTo = req.getParameter("to");
+
+curFrom = req.getParameter("from");
+
+/*Open a connection to google and read the result*/
+
+try {
+
+query = "http://www.google.com/ig/calculator?hl=en&q=" + amount + curFrom + "=?" + curTo;
+
+URL url = new URL(query);
+
+InputStreamReader stream = new InputStreamReader(url.openStream());
+
+BufferedReader in = new BufferedReader(stream);
+
+String str = "";
+
+String temp = "";
+
+while ((temp = in.readLine()) != null) {
+
+str = str + temp;
+
+}
+
+/*Parse the result which is in json format*/
+
+Gson gson = new Gson();
+
+Recv st = gson.fromJson(str, Recv.class);
+
+String rhs = st.getRhs();
+
+rhs = rhs.replaceAll("�", "");
+
+/*we do the check in order to print the additional word(millions,billions etc)*/
+
+StringTokenizer strto = new StringTokenizer(rhs);
+
+String nextToken;
+
+out.write(strto.nextToken());
+
+nextToken = strto.nextToken();
+
+if( nextToken.equals("million") || nextToken.equals("billion") || nextToken.equals("trillion"))
+
+{
+
+out.println(" "+nextToken);
+
+}
+
+} catch (NumberFormatException e) {
+
+out.println("The given amount is not a valid number");
+
+}
+
+}
+
+// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
+
+/**
+
+* Handles the HTTP <code>GET</code> method.
+
+* @param request servlet request
+
+* @param response servlet response
+
+* @throws ServletException if a servlet-specific error occurs
+
+* @throws IOException if an I/O error occurs
+
+*/
+
+@Override
+
+protected void doGet(HttpServletRequest request, HttpServletResponse response)
+
+throws ServletException, IOException {
+
+processRequest(request, response);
+
+}
+
+/**
+
+* Handles the HTTP <code>POST</code> method.
+
+* @param request servlet request
+
+* @param response servlet response
+
+* @throws ServletException if a servlet-specific error occurs
+
+* @throws IOException if an I/O error occurs
+
+*/
+
+@Override
+
+protected void doPost(HttpServletRequest request, HttpServletResponse response)
+
+throws ServletException, IOException {
+
+processRequest(request, response);
+
+}
+
+/**
+
+* Returns a short description of the servlet.
+
+* @return a String containing servlet description
+
+*/
+
+@Override
+
+public String getServletInfo() {
+
+return "Short description";
+
+}// </editor-fold>
+
+}