Front-end jquery uses Ajax to interact with back-end servlet data

Front-End Code:

1 $.ajax ({2Type: "POST",3URL: "Calculator",//The servlet file is named Calculator and needs to be registered in Web. XML in advance4DataType: "Text",5 Data:6                 {7"Operator1": Operator1,//Number of operands8"Operatorsign": Operatorsign,//operator9"Operator2": Operator2//Number of operandsTen                 }, OneSuccess:function(Result) A                 { -                         //Result is the data passed to the back-end post function, where the resulting operation code is written -                 }, theError:function(XHR, status, ErrMsg) -                 { -Alert ("Data transfer failed!")); -                 } +});

Back-End Code:

1 protected voidDoPost (HttpServletRequest request, httpservletresponse response)throwsservletexception, IOException {2         //The following data is received3         DoubleOperator1 = double.parsedouble (Request.getparameter ("Operator1"));4String operatorsign = Request.getparameter ("Operatorsign");5         DoubleOperator2 = double.parsedouble (Request.getparameter ("Operator2"));6 7         if(Operatorsign.equals ("+"))8         {9PrintWriter out = Response.getwriter ();//Set Transfer parametricTenOut.print (Add (Operator1, Operator2));//results to the front end One         } A         Else if(Operatorsign.equals ("-"))  -         { -PrintWriter out =Response.getwriter (); the Out.print (Sub (Operator1, Operator2)); -         } -         Else if(Operatorsign.equals ("*"))  -         { +PrintWriter out =Response.getwriter (); - Out.print (mult (Operator1, Operator2)); +         } A         Else if(Operatorsign.equals ("/"))  at         { -PrintWriter out =Response.getwriter (); - out.print (Dev (operator1, Operator2)); -         } -     } -      Public DoubleAddDoubleADoubleb) in     { -         returnA +b; to     } +  -      Public DoubleSubDoubleADoubleb) the     { *         returnA-b; $     }Panax Notoginseng      Public DoubleMultDoubleADoubleb) -     { the         returnA *b; +     } A      Public DoubleDevDoubleADoubleb) the     { +             returnA/b; -}

Front-end jquery uses Ajax to interact with back-end servlet data