javascript - How to send parameters from ajax to servlet -
i trying add 2 numbers using servlets , ajax/javascript. getting java.lang.numberformatexception: , values null. can know how pass parameters ajax servlet.
sumwithajaxservlet.java
public class sumwithajaxservlet extends httpservlet { protected void dopost(httpservletrequest request,httpservletresponse response)throws servletexception,ioexception { printwriter out = response.getwriter(); system.out.println("n1 : "+request.getparameter("n1")); system.out.println("n2 : "+request.getparameter("n2")); int num1 = integer.parseint(request.getparameter("n1")); int num2 = integer.parseint(request.getparameter("n2")); out.println(num1+num2+""); } } index.jsp
<script type="text/javascript"> function calc() { var xmlhttp = new xmlhttprequest(); var value1 = document.getelementbyid("n1").value; var value2 = document.getelementbyid("n2").value; xmlhttp.open("post", "sumwithajaxservlet", true); xmlhttp.send(value1 + "," + value2); var result = document.getelementbyid("result"); result.innerhtml = xmlhttp.responsetext; } </script> <body> <form id='calcform'> <table border="3"> <tr> <td>enter 1st number :</td> <td><input type="text" name="n1" id="n1"></td> </tr> <tr> <td>enter 2nd number :</td> <td><input type="text" name="n2" id="n2"></td> </tr> <tr> <td>result :</td> <td><input type="text" value="" id="result"></td> </tr> <tr> <td> </td> <td><input type="button" id="calculate" value="calculate" onclick="calc()" /></td> </tr> </table> </form> </body> web.xml
<?xml version="1.0" encoding="utf-8"?> <web-app> <servlet> <servlet-name>sumwithajaxservlet</servlet-name> <servlet-class>sumwithajaxservlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>sumwithajaxservlet</servlet-name> <url-pattern>/sumwithajaxservlet</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app>
you sending data using non-standard, custom encoding, trying parse if encoded using standard form url encoding.
given, sake of example, values 333 , 555: sending string 333,555. need send string n1=333&n2=555.
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