getting string value from jscript to servlet
Question
I've a little doubt with this...how can i set/retrieve the value from a jsp page jscript string named "z" in a servlet.I need to use it in servlet...I'M exploring new thing n its a new thing for me as i"m new to these thing...Thanks for the quick help....i need the value of password if pass1 and pass2 are same,n then i need to retrieve it in servlet if pass1==pass2...tell me a way...for that i wrote a jscript to check pass1==pass2..
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>New User Registration</title>
<script>
function myFunction(){
var x = document.forms["newForm"]["pass1"].value;
var y = document.forms["newForm"]["pass2"].value;
if(x==y){
document.newForm.submit();var z=x;
return true;
}
else {
alert("Passwords not matching!!!");}
}
</script>
</head>
<body>
<h1>Form</h1>
<fieldset>
<form name=newForm action="RegServlet">Username:<input
type="text" name="username"><br>
Password:<input type="text" name="pass1" id="pass1"><br>
Confirm Password:<input type="text" name="pass2" id="pass2"><br>
<input type="submit" onclick=myFunction() value="Create"></input></form>
</fieldset>
</body>
</html>
servlet
package myPack;
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class RegServlet
*/
public class RegServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public RegServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
String s1=request.getParameter("username");
System.out.println(s1);
String s2=request.getParameter("");//HERE I NEED THE PAssword value if PASS!==PASS2
System.out.println(s2);
String c="jdbc:mysql://localhost:3306/test";
Connection con=null;
System.out.println("Connection OK");
try{
Class.forName("com.mysql.jdbc.Driver").newInstance();
System.out.println("Done2");
con = DriverManager.getConnection(c, "root", "MyNewPass");
System.out.println("Done3");
PreparedStatement ps=null;
System.out.println("Done4");
String qs = "insert into userinfo values(?,?);";
ps = con.prepareStatement(qs);
ps.setString(1,s1);
ps.setString(2,s2);
System.out.println("Success");
ps.execute();
con.close();
}
catch (Exception e) {
System.out.println("Failed: " + e.toString());
// TODO: handle exception
System.out.println("Failed");}}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
}
}
2 answers
solution1
1 2012-11-29 10:36:26
Create a hidden field in your form; then in your "onsubmit" event set the value of that field to z.
<input type="hidden" name="zValue" id="zValue">
in onsubmit event
document.getElementById("zValue").value="The value I want to send";
and retrieve in your servlet as any other parameter.
solution2
0 2012-11-29 10:52:54
The following is an example i use in tomcat. It will get you all parameters that are send in a POST or GET request. Be advised that this does not cover multicast requests (which are needed for file transfers).
I don't know if it will work for you, as you have not specified you servlet container.
import java.io.*;
import javax.servlet.*;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.*;
import java.util.*;
@WebServlet(description = "A simple request test.", urlPatterns = { "/requesttest" })
public class RequestTest extends HttpServlet {
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
String title = "Reading All Request Parameters";
out.println("<BODY BGCOLOR=\"#FDF5E6\">\n" +
"<H1 ALIGN=CENTER>" + title + "</H1>\n" +
"<TABLE BORDER=1 ALIGN=CENTER>\n" +
"<TR BGCOLOR=\"#FFAD00\">\n" +
"<TH>Parameter Name<TH>Parameter Value(s)");
Enumeration<String> paramNames = request.getParameterNames();
while(paramNames.hasMoreElements()) {
String paramName = (String)paramNames.nextElement();
out.println("<TR><TD>" + paramName + "\n<TD>");
String[] paramValues = request.getParameterValues(paramName);
if (paramValues.length == 1) {
String paramValue = paramValues[0];
if (paramValue.length() == 0)
out.print("<I>No Value</I>");
else
out.print(paramValue);
} else {
out.println("<UL>");
for(int i=0; i<paramValues.length; i++) {
out.println("<LI>" + paramValues[i]);
}
out.println("</UL>");
}
}
out.println("</TABLE>\n</BODY></HTML>");
}
public void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}
EDIT
Seeing as you edited your question with your servlet code, the answer should be really simple.
String s2=request.getParameter("pass1");
This should get you the value that is transmitted within the password field. This is no different than you getting the username with String s1=request.getParameter("username");
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