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ShowMeTheBitsServlet.java 6.27 KB
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package com.roshka.webprojecttest.servlets;

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

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
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@WebServlet("/show-me-the-bits")
public class ShowMeTheBitsServlet extends HttpServlet {
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	protected void doGet(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException
	{
		PrintWriter pw = new PrintWriter(resp.getOutputStream());
		Boolean valido=true;
		String parametro =  req.getParameter("number");
		Integer [] vectorResultado = new Integer [16];
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		if(parametro == null) {
			initForm(pw);
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		}
		else {
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			String tipo="";
			if(parametro.length() < 1)
				valido=false;
			else if(parametro.length() >1 ) {
				if(parametro.charAt(0) == '0') {
					if(parametro.charAt(1) == 'x')
						tipo = "hexadecimal";
					else
						tipo = "octal";;
				}else
					tipo="decimal";
			}else
				tipo= "decimal";;
				
				if(tipo.equals("decimal")) {
					for ( int i = 0 ; i< parametro.length(); i++)
						if(!Character.isDigit(parametro.charAt(i)))
							valido = false;
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				}
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				else if(tipo.equals("octal")) {
					for ( int i = 1 ; i< parametro.length(); i++)
						if(!Character.isDigit(parametro.charAt(i)))
							valido = false;
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				}
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				else if(tipo.equals("hexadecimal")) {
					for ( int i = 2 ; i < parametro.length(); i++ )
						if( !isHexaDigit(parametro.charAt(i) ) )
							valido = false;
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				}
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				int validAux = 0;
				if(valido) {
					if(tipo.equals("decimal") ) 
						validAux = Integer.parseInt(parametro,10);  
					else if( tipo.equals("hexadecimal") )
						validAux = Integer.parseInt(parametro.substring(2),16);
					else
						validAux = Integer.parseInt(parametro.substring(1),8);
				}
				if(validAux > 65535)
					valido = false;
				if (!valido) {
					invalido(pw, parametro);
				}
				else {
					transformacion(tipo, parametro, vectorResultado);
					theTable(pw, vectorResultado);
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				}
			
		}
		pw.close();
	}
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	void initForm(PrintWriter pw) {
		pw.write("<html>"
				+ "<head>"
				+ "<title>Hola, bienvenidos al show me the bits</title>"
				+ "</head>"
				+ "<body>"
				+ "<h1>Soy un conversor sistemas de numeracion</h1>"
				+ "<div>"
				+ "<form action=\"show-me-the-bits\"  >"
				+ "Introduzca el numero: <input type=\"text\"  name=number><br>"
				+ "<input type=\"submit\">"
				+ "</form>"
				+ "</div>"
				+ "</body>"
				+ "</html>");
	}
	
	void theTable(PrintWriter pw, Integer [] vectorResultado) {
		pw.write("<html>"
				+ "<head>"
				+ "<title>Hola, bienvenidos al conversor de numeros</title>"
				+ "</head>"
				+ "<body>"
				+ "<h1>Soy un conversor de sistemas de numeracion</h1>"
				+ "<div>"
				+ "<form action=\"show-me-the-bits\"  >"
				+ "Introduzca el numero: <input type=\"text\"  name=number><br>"
				+ "<input type=\"submit\">"
				+ "</form>"
				+ "</div>"
				+ "<table>" 
				+ "<tr>");
		for(int i = 15; i >= 0 ; i--) {
			if(vectorResultado[i] == 1) {
				pw.write("<th style=\"color: gold ; background-color:darkblue;\">" + vectorResultado[i]+"</th>");
				
			}
			else {
				pw.write("<th style=\"color:fuchsia ; background-color:darkblue;\">"+vectorResultado[i]+"</th>");
			}
			if(i == 8) {
				pw.write("<th> === </th>");
			}
			else if(i == 0) {
				pw.write("</tr>");
			}
			else
				pw.write("<th> | </th>");
				
		}
		pw.write( "</table>"

				+ "</body>"
				+ "</html>");	
	}
	
	void invalido(PrintWriter pw, String parametro) {
		pw.write("<html>"
				+ "<head>"
				+ "<title>Error de parametro</title>"
				+ "</head>"
				+ "<body>"
				+ "No se puede generarla tabla de bits. Valor del parametro \"" + parametro + "\" invalido."
				+ "</body>"
				+ "</html>");
	}
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	public void transformacion(String tipo, String valor, Integer [] resultado) {
		if(tipo.equals("decimal")) {
			Integer numero = Integer.parseInt(valor);
			int [] vectorAux = new int[16];
			vectorAux[0] = 1;
			for(int i = 1 ; i < 16 ;i++) {
				vectorAux[i] = vectorAux[i-1]*2;
			}
			for(int i = 15 ; i > -1 ; i--) {
				if(numero >= vectorAux[i]) {
					resultado[i]=1;
					numero%=vectorAux[i];
				}
				else {
					resultado[i] = 0;
				}
			}
		}
		
		else if(tipo.equals("hexadecimal")  ) {
			String cadenaAux = "";
			int k = 0;
			for (int i = valor.length()-1 ; i > 1 ; i--){
				cadenaAux = hexaToBin(valor.charAt(i));
				for(int j = 3 ; j > -1 ; j--) {
					resultado[k++]=Integer.parseInt(""+cadenaAux.charAt(j));
				}
			}
			while(k<16)
				resultado[k++]=0;
		}
		else if( tipo.equals("octal")  ) {
			String cadenaAux = "";
			int k = 0;
			for (int i = valor.length()-1 ; i > 0 ; i--){
				cadenaAux = octalToBin(valor.charAt(i));
				for(int j = 2 ; j > -1; j--) {
					resultado[k++]=Integer.parseInt(""+cadenaAux.charAt(j));
				}
			}
			while(k<16)
				resultado[k++]=0;
		}
	}
	public String hexaToBin(char caracter) {
		if(caracter == 'F')
			return "1111";
		if(caracter == 'E')
			return "1110";
		if(caracter == 'D')
			return "1101";
		if(caracter == 'C')
			return "1100";
		if(caracter == 'B')
			return "1011";
		if(caracter == 'A')
			return "1010";
		if(caracter == '9')
			return "1001";
		if(caracter == '8')
			return "1000";
		if(caracter == '7')
			return "0111";
		if(caracter == '6')
			return "0110";
		if(caracter == '5')
			return "0101";
		if(caracter == '4')
			return "0100";
		if(caracter == '3')
			return "0011";
		if(caracter == '2')
			return "0010";
		if(caracter == '1')
			return "0001";
		if(caracter == '0')
			return "0000";
		return "";
		
	}
	public String octalToBin(char caracter) {
		if(caracter == '7')
			return "111";
		if(caracter == '6')
			return "110";
		if(caracter == '5')
			return "101";
		if(caracter == '4')
			return "100";
		if(caracter == '3')
			return "011";
		if(caracter == '2')
			return "010";
		if(caracter == '1')
			return "001";
		if(caracter == '0')
			return "000";
		return "";
	}
	
	public Boolean isHexaDigit(char caracter) {
		if( caracter == '0' ||caracter == '1' ||caracter == '2' ||caracter == '3' ||
			caracter == '4' ||caracter == '5' ||caracter == '6' ||caracter == '7' ||
			caracter == '8' ||caracter == '9' ||caracter == 'A' ||caracter == 'B' ||
			caracter == 'C' ||caracter == 'D' ||caracter == 'E' ||caracter == 'F' ) {
			return true;
		}
		else
			return false;
	}
}