Stuts2 use Dispatchaction to make a simple calculator

UseDispatchaction make a simple calculator

Dispatchaction is one of the actions in struts and is a dynamic action that can handle the same type of method

1.calculator.jsp (Calculation page)

  View plain Copy to clipboard print? <%@ page language= "java"  pageencoding= "GB18030"%>      <! doctype html public  "-//w3c//dtd html 4.01 transitional//en" >   < html>     

2.CalculatorForm (reference, Verification actionfrom)

View plain Copy to clipboard print? package com.feng.struts.form;      import javax.servlet.http.httpservletrequest;    import org.apache.struts.action.actionerrors;   import  org.apache.struts.action.actionform;   import org.apache.struts.action.actionmapping;    import org.apache.struts.action.actionmessage;      public class  calculatorform extends actionform {    private double num1;    private double num2;    private double result;      &NBSP;PUBLIC&NBSP;DOUBLE&NBSP;GETNUM1 ()  {     return num1;    }        public void setnum1 (double num1)  {      this.num1 = num1;    }      &NBSP;PUBLIC&NBSP;DOUBLE&NBSP;GETNUM2 ()  {     return num2;    }       public  void setnum2 (double num2)  {     this.num2 = num2;     }       public double getresult ()  {      return result;    }       public void setresult (double  result)  {     this.result = result;    }       public actionerrors validate (actionmapping mapping,       httpservletrequest request)  {     actionerrors errors = new  actionerrors ();     if  ("". Equals (NUM1)  | |   ". Equals (num2))  {      errors.add (" Num.null ",  new actionmessage ( "Num.num"));     }     return errors;    }       public void  Reset (actionmapping mapping, httpservletrequest request)  {     //  Todo auto-generated method stub     }  }   Package Com.feng.struts.form; Import Javax.servlet.http.HttpServletRequest; Import org.apache.struts.action.ActionErrors; Import Org.apache.struts.action.ActionForm; Import org.apache.struts.action.ActionMapping; Import Org.apache.struts.action.ActionMessage; public class CalculatorForm extends Actionform {private double num1; private double num2; private double result; public d Ouble GetNum1 () {return num1;} public void SetNum1 (double num1) {this.num1 = NUM1;} public double getNum2 () {return n um2; public void setNum2 (double num2) {this.num2 = num2,} public double GetResult () {return result;} public void Setresul T (double result) {This.result = result;} publicActionerrors Validate (actionmapping mapping, HttpServletRequest request) {actionerrors errors = new Actionerrors (); if (" ". Equals (NUM1) | |" ". Equals (num2)) {Errors.add ("Num.null", New Actionmessage ("Num.num"));} return errors; } public void Reset (actionmapping mapping, HttpServletRequest request) {//TODO auto-generated Method stub}}  &nbs P

3.CalculatorAction (processing class dispatchaction)

View plain Copy to clipboard print? package com.feng.struts.action;      import javax.servlet.http.httpservletrequest;    import javax.servlet.http.httpservletresponse;      import  org.apache.struts.action.actionerrors;   import org.apache.struts.action.actionform;   import org.apache.struts.action.actionforward;   import  org.apache.struts.action.actionmapping;   import org.apache.struts.action.actionmessage;    import org.apache.struts.action.actionmessages;   import  org.apache.struts.actions.dispatchaction;      import  com.feng.struts.form.calculatorform;      public class calculatoraction  extends dispatchaction {       public actionforward add ( actionmapping mapping, actionform form,     &nbsp Httpservletrequest request, httpservletresponse response)  {      calculatorform calculatorform =  (calculatorform)  form;      Calculatorform.setresult (CALCULATORFORM.GETNUM1 ()        +  Calculatorform.getnum2 ());     return mapping.findforward ("OK");    }        public actionforward sub (actionmapping mapping, actionform  form,      HttpServletRequest request, HttpServletResponse  Response)  {     CalculatorForm calculatorForm =  (calculatorform)   form;     calculatorform.setresult (CALCULATORFORM.GETNUM1 ()         - calculatorform.getnum2 ());     return mapping.findforward ("OK");     }       pUblic actionforward mul (actionmapping mapping, actionform form,       httpservletrequest request, httpservletresponse response)  {      CalculatorForm calculatorForm =  (calculatorform)  form;      Calculatorform.setresult (CALCULATORFORM.GETNUM1 ()        *  Calculatorform.getnum2 ());     return mapping.findforward ("OK");    }        public actionforward div (actionmapping mapping, actionform  form,      HttpServletRequest request, HttpServletResponse  Response)  {     CalculatorForm calculatorForm =  (calculatorform)   form;     if  (calculatorform.getnum2 ()  == 0)  {       ActionErrors errors=new Actionerrors ();  //   errors.add ("num",  new actionmessage ("Num.zero"));   //   super.saveerrors (request, errors);       actionmessages message=new actionmessages ();       message.add ("D",  new actionmessage ("Num.zero"));      super.saveerrors (request, message);      return mapping.findforward ("no");      } else {      calculatorform.setresult (CALCULATORFORM.GETNUM1 ()     &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;/&NBSP;CALCULATORFORM.GETNUM2 ());      return  mapping.findforward ("OK");     }    }  }   Package Com.feng.struts.action; Import Javax.servlet.http.HttpServletRequest; Import Javax.servlet.http.HttpServletResponse; Import Org.apache.struts.action.ActionERrors; Import Org.apache.struts.action.ActionForm; Import Org.apache.struts.action.ActionForward; Import org.apache.struts.action.ActionMapping; Import Org.apache.struts.action.ActionMessage; Import Org.apache.struts.action.ActionMessages; Import org.apache.struts.actions.DispatchAction; Import Com.feng.struts.form.CalculatorForm; public class Calculatoraction extends Dispatchaction {public actionforward Add (actionmapping Mapping, actionform form, Ht Tpservletrequest request, HttpServletResponse response) {CalculatorForm CalculatorForm = (calculatorform) Form; Calculatorform.setresult (CALCULATORFORM.GETNUM1 () + calculatorform.getnum2 ()); Return Mapping.findforward ("OK"); } public Actionforward Sub (actionmapping Mapping, actionform form, httpservletrequest request, HttpServletResponse Response) {CalculatorForm CalculatorForm = (calculatorform) Form; Calculatorform.setresult (CALCULATORFORM.GETNUM1 ()- Calculatorform.getnum2 ()); Return Mapping.findforward ("OK"); } public Actionforward MUL (actionmapping mapping, actionform form, httpservletrequest request, httpservletresponse response) {CalculatorForm CalculatorForm = (calculatorform) Form; Calculatorform.setresult (CALCULATORFORM.GETNUM1 () * CALCULATORFORM.GETNUM2 ()); Return Mapping.findforward ("OK"); } public Actionforward Div (actionmapping mapping, actionform form, httpservletrequest request, HttpServletResponse Response) {CalculatorForm CalculatorForm = (calculatorform) Form; if (calculatorform.getnum2 () = = 0) {actionerrors error S=new actionerrors (); Errors.add ("num", New Actionmessage ("Num.zero")); Super.saveerrors (request, errors); Actionmessages message=new actionmessages (); Message.add ("D", New Actionmessage ("Num.zero")); Super.saveerrors (request, message); Return Mapping.findforward ("no"); } else {Calculatorform.setresult (CALCULATORFORM.GETNUM1 ()/calculatorform.getnum2 ()); return Mapping.findforward (" OK "); }}}   

4.applicationresources.properties (resource file, displaying error message)

View plain Copy to clipboard print?   num.null=/u6570/u5b57/u4e0d/u80fd/u4e3a/u7a7a/!/!/!   num.zero=/u6570/u5b57/u4e0d/u80fd/u4e3a/u96f6/!/!/! num.null=/u6570/u5b57/u4e0d/u80fd/u4e3a/u7a7a/!/!/! num.zero=/u6570/u5b57/u4e0d/u80fd/u4e3a/u96f6/!/!/!

5.struts-config.xml (config file)

View plain Copy to clipboard print? <?xml version= "1.0"  encoding= "UTF-8"?>   <! doctype struts-config public  "-//apache software foundation//dtd struts  configuration 1.2//en " " HTTP://STRUTS.APACHE.ORG/DTDS/STRUTS-CONFIG_1_2.DTD ">       <struts-config>     <data-sources />     < form-beans >       <form-bean name= "CalculatorForm"  type= " Com.feng.struts.form.CalculatorForm " />        </form-beans>         <global-exceptions />     <global-forwards  />     <action-mappings >       <action          attribute= "CalculatorForm"           input= "/form/calculator.jsp"          name= "CalculatorForm"          parameter= "method"          path= "/ Calculator "         scope=" request "          type= "Com.feng.struts.action.CalculatorAction"  >          <forward name= "OK"  path= "/result.jsp" ></forward>          <forward name= "No"  path= "/error.jsp" ></forward>          </<