java servlet - Registration issue - 


package jdbc;  import java.io.ioexception; import java.io.printwriter; import java.sql.*; import static java.lang.system.out; import java.util.logging.level; import java.util.logging.logger; import javax.servlet.servletexception; import javax.servlet.http.httpservlet; import javax.servlet.http.httpservletrequest; import javax.servlet.http.httpservletresponse;  public class registration extends httpservlet {      protected void processrequest(httpservletrequest request, httpservletresponse response)             throws servletexception, ioexception {         response.setcontenttype("text/html;charset=utf-8");          try {             string name = request.getparameter("name");             string email = request.getparameter("email");             string pass = request.getparameter("password");             string sql="insert regis(name,email,password) values(?,?,?)";              class.forname("com.java.mysql.driver");             connection con = drivermanager.getconnection("jdbc:mysql://localhost:3306/login","root","3839");             preparedstatement ps= con.preparestatement(sql);             ps.setstring(1,name);             ps.setstring(2, email);             ps.setstring(3, pass);              ps.executeupdate();             printwriter out= response.getwriter();             out.println("registration done !!");         } catch (ioexception | classnotfoundexception | sqlexception ex) {             out.println(ex);         }         }      @override     protected void doget(httpservletrequest request, httpservletresponse response)             throws servletexception, ioexception {         processrequest(request, response);     }      @override     protected void dopost(httpservletrequest request, httpservletresponse response)             throws servletexception, ioexception {         processrequest(request, response);     }      @override     public string getservletinfo() {         return "short description";     } }

i beginner in this, have done first have created 2 jsp login & register , 1 servlet (as code above), did mapping in web.xml , had connected mysql server (connector , jdbc driver ). still when enter data in register page , submit show (//localhost:8084/webapplication5/registration) nothing blank page, didnt show exception also.

web.xml

 <?xml version="1.0" encoding="utf-8"?> <web-app version="3.1" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/xmlschema-instance" xsi:schemalocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd">     <display-name>registration </display-name>     <servlet>         <servlet-name>reg</servlet-name>         <servlet-class>jdbc.registration</servlet-class>     </servlet>     <servlet-mapping>         <servlet-name>reg</servlet-name>         <url-pattern>/registration</url-pattern>     </servlet-mapping> </web-app>

you're setting content type of response "text/html;charset=utf-8", content you're writing text/plain.

besides, highly recommend use datasource define in configuration of servlet container.

update:

try this:

    response.setcontenttype("text/plain;charset=utf-8");     try (printwriter out = response.getwriter()) {         try {             string name = request.getparameter("name");             string email = request.getparameter("email");             string pass = request.getparameter("password");             string sql = "insert regis(name,email,password) values(?,?,?)";              class.forname("com.java.mysql.driver");             connection con = drivermanager.getconnection("jdbc:mysql://localhost:3306/login", "root", "3839");             preparedstatement ps = con.preparestatement(sql);             ps.setstring(1, name);             ps.setstring(2, email);             ps.setstring(3, pass);              ps.executeupdate();             out.println("registration done !!");          } catch (ioexception | classnotfoundexception | sqlexception ex) {             out.println(ex);         }     }

update 2:

my mistake: writer doesn't need closed:

    response.setcontenttype("text/plain;charset=utf-8");     printwriter out = response.getwriter();     try {         string name = request.getparameter("name");         string email = request.getparameter("email");         string pass = request.getparameter("password");         string sql = "insert regis(name,email,password) values(?,?,?)";          class.forname("com.java.mysql.driver");         connection con = drivermanager.getconnection("jdbc:mysql://localhost:3306/login", "root", "3839");         preparedstatement ps = con.preparestatement(sql);         ps.setstring(1, name);         ps.setstring(2, email);         ps.setstring(3, pass);          ps.executeupdate();         out.println("registration done !!");      } catch (ioexception | classnotfoundexception | sqlexception ex) {         out.println(ex);     }

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