insert multiple selection - Java
how to insert multiple selection values from html into database using servlets
View Answers
April 23, 2012 at 12:26 PM
1)form.jsp:
<html> <body> <form method = "post" action = "/Examples/GetParameterValues"> <p>Which of the programming languages you like the most</p> <select name="lang"> <option value="C/C++">C/C++</option> <option value="Java">C/C++</option> <option value=".NET">C/C++</option> <option value="Perl">C/C++</option> <option value="Pascal">C/C++</option> </select> </form> </body> </html>
2) GetParameterValues.java
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class GetParameterValues extends HttpServlet{
protected void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter pw = response.getWriter();
String[] lang = request.getParameterValues("lang");
for(int i=0; i<whisky.length; i++){
pw.println("<br>Language : " + lang[i]);
}
}
}
3)web.xml file
<servlet> <servlet-name>GetParameterValues</servlet-name> <servlet-class>GetParameterValues</servlet-class> </servlet> <servlet-mapping> <servlet-name>GetParameterValues</servlet-name> <url-pattern>/GetParameterValues</url-pattern> </servlet-mapping>
April 23, 2012 at 12:28 PM
Put attribute multiple in select tag. I forget to do that.Anyways change the form.jsp to the following code:
<html> <body> <form method = "post" action = "/Examples/GetParameterValues"> <p>Which of the programming languages you like the most</p> <select name="lang"> <option value="C/C++">C/C++</option> <option value="Java">C/C++</option> <option value=".NET">C/C++</option> <option value="Perl">C/C++</option> <option value="Pascal">C/C++</option> </select> </form> </body> </html>
April 23, 2012 at 4:06 PM
Modify the servlet. It actually displays the selected values. So ti insert the selected values, try this:
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class GetParameterValues extends HttpServlet{
protected void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
String languages=" ";
response.setContentType("text/html");
PrintWriter pw = response.getWriter();
String[] lang = request.getParameterValues("lang");
for(int i=0; i<lang.length; i++){
lanuages+=lang[i]+" ";
}
try{
Class.forName("com.mysql.jdbc.Driver").newInstance();
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "root" );
Statement st=conn.createStatement();
st.executeUpdate("insert into data(languages) values('"+languages+"')");
pw.println("Inserted Successfully!");
}
catch(Exception e){}
}
}
April 23, 2012 at 4:14 PM
import java.sql.* to the above servlet code.
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