###前提・実現したいこと
Eclipse環境で、Javaの電卓のwebアプリケーションを作成しています。
###発生している問題・エラーメッセージ
電卓のようにボタンを押して計算する機能をつけたいが、 計算処理のコードの書き方がわからない。
###該当のソースコード
Java
1package pack2; 2 3import java.io.IOException; 4import java.io.PrintWriter; 5 6import javax.servlet.ServletContext; 7import javax.servlet.ServletException; 8import javax.servlet.annotation.WebServlet; 9import javax.servlet.http.HttpServlet; 10import javax.servlet.http.HttpServletRequest; 11import javax.servlet.http.HttpServletResponse; 12 13 14/** 15 * Servlet implementation class Dentaku 16 */ 17@WebServlet("/DentakuFrame.java") 18public class DentakuFrame extends HttpServlet { 19 20 21 private static final long serialVersionUID = 1L; 22 23 24 /** 25 * @see HttpServlet#HttpServlet() 26 */ 27 public Dentaku() { 28 29 super(); 30 // TODO Auto-generated constructor stub 31 } 32 33 34 /** 35 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) 36 */ 37 @Override 38 protected void doGet( HttpServletRequest request, HttpServletResponse response ) throws ServletException, IOException { 39 40 this.doPost( request, response ); 41 } 42 43 44 /** 45 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) 46 */ 47 @Override 48 protected void doPost( HttpServletRequest request, HttpServletResponse response ) throws ServletException, IOException { 49 50 response.setContentType( "text/html; charset=UTF-8" ); 51 request.setCharacterEncoding( "UTF-8" ); 52 53 ServletContext application = this.getServletContext(); 54 int kekka = 0; 55 56 PrintWriter out = response.getWriter(); 57 out.println( "<html>" ); 58 out.println( "<head>" ); 59 out.println( "<title>" ); 60 out.println( "電卓" ); 61 out.println( "</title>" ); 62 out.println( "</head>" ); 63 out.println( "<body>" ); 64 out.println( "演算結果:" + kekka ); 65 out.println( "<form action='/psc/Dentaku' method='post'>" ); 66 out.println( "<input type='text' name = 'text' value = '' size=50>" ); 67 out.println( "<br>" ); 68 out.println( "<input type='submit' value=' + ' name='tasu'>" ); 69 out.println( "<input type='submit' value=' - ' name='hiku'>" ); 70 out.println( "<input type='submit' value=' × ' name='kakeru'>" ); 71 out.println( "<input type='submit' value=' / ' name='waru'>" ); 72 out.println( "<br>" ); 73 out.println( "<input type='submit' value=' 0 ' name='zero'>" ); 74 out.println( "<input type='submit' value=' 1 ' name='ichi'>" ); 75 out.println( "<input type='submit' value=' 2 ' name='zero'>" ); 76 out.println( "<input type='submit' value=' 3 ' name='ichi'>" ); 77 out.println( "<br>" ); 78 out.println( "<input type='submit' value=' 4 ' name='zero'>" ); 79 out.println( "<input type='submit' value=' 5 ' name='ichi'>" ); 80 out.println( "<input type='submit' value=' 6 ' name='zero'>" ); 81 out.println( "<input type='submit' value=' 7 ' name='ichi'>" ); 82 out.println( "<br>" ); 83 out.println( "<input type='submit' value=' 8 ' name='zero'>" ); 84 out.println( "<input type='submit' value=' 9 ' name='ichi'>" ); 85 out.println( "<input type='submit' value=' c ' name='zero'>" ); 86 out.println( "<input type='submit' value=' = ' name='ichi'>" ); 87 out.println( "</form>" ); 88 out.println( "</body>" ); 89 out.println( "</html>" ); 90 91 application.setAttribute( "apkekka", kekka ); 92 } 93 94 95 public boolean isNumber( String num ) { 96 97 try { 98 Integer.parseInt( num ); 99 return true; 100 } catch ( NumberFormatException e ) { 101 return false; 102 } 103 } 104 105}
###試したこと
計算処理について調べてみたが、ラジオボタンを使った計算や、数字を記入して計算するものなどで参考になるものが見つからなかった。
###補足情報(言語/FW/ツール等のバージョンなど)
Eclipse
Java
Tomcat
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