servlet
servlet
print("code sample");
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
public class Login extends HttpServlet
{
public void doGet(HttpServletRequest req, HttpServletResponse res)throws ServletException, IOException
{
PrintWriter pw=res.getWriter();
res.setContentType("text/html");
pw.println("Hello");
try
{
Class.forName("com.mysql.jdbc.Driver");
Connection con=DriverManager.getConnection("jdbc:mysql://localhost/latha","root","root");
String uid=req.getParameter("Userid");
String un=req.getParameter("Username");
String p=req.getParameter("Password");
PreparedStatement p1=con.prepareStatement("select * from Logintab where Userid=? and Username=? and Password=?");
p1.setString(1,uid);
p1.setString(2,un);
p1.setString(3,p);
ResultSet r=p1.executeQuery();
boolean b=r.next();
if(b=true)
{
res.sendRedirect("http://localhost:8080/lata/Pms.html");
}
else
{
pw.println("login is not successful");
}
con.close();
}
catch (Exception e)
{
pw.println(e);
}
}
}
this is the code for .java servlet am able to run sucessful but when i give wrong login it won't display login is not sucessful .instead it redirect to pms.html
View Answers
January 7, 2011 at 5:10 PM
Hello Friend,
The sendRedirect()method redirects the page so your message is not getting displayed. IF you want this, then try the following code:
1)login.jsp:
<html>
<script>
function validate(){
var username=document.form.user.value;
var password=document.form.pass.value;
if(username==""){
alert("Enter Username!");
return false;
}
if(password==""){
alert("Enter Password!");
return false;
}
return true;
}
</script>
<form name="form" method="post" action="../Login" onsubmit="javascript:return validate();">
<table>
<tr><td>Username:</td><td><input type="text" name="user"><label id="lab1"></label></td></tr>
<tr><td>Password:</td><td><input type="password" name="pass"><label id="lab2"></label></td></tr>
<tr><td></td><td><input type="submit" value="Submit"></td></tr>
</table>
</form>
</html>
<%String msg=request.getParameter("msg");
if(msg!=null){
%>
<label><font color="red"><%=msg%></font></label>
<%
}
%>
2)Login.java:
import java.io.*;
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class Login extends HttpServlet{
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
try{
response.setContentType("text/html");
PrintWriter out=response.getWriter();
String user=request.getParameter("user");
String pass=request.getParameter("pass");
Class.forName("com.mysql.jdbc.Driver");
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "root");
Statement st=con.createStatement();
ResultSet rs=st.executeQuery("select * from login where username='"+user+"' and password='"+pass+"'");
int count=0;
while(rs.next()){
count++;
}
if(count>0){
out.println("welcome "+user);
}
else{
String msg="Login is not successful";
response.sendRedirect("/examples/jsp/login.jsp?msg="+msg);
}
}catch (Exception e){
e.printStackTrace();
}
}
}
Hope that it will be helpful for you.
Thanks
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