I am trying to store files (text or image) in mySql database using jsp and servlet.
This is index.jsp.
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>File Upload to Database Demo</title>
</head>
<body>
<center>
<h1>File Upload to Database Demo</h1>
<form method="post" action="FileUploadDBServlet" enctype="multipart/form-data">
<table border="0">
<tr>
<td>First Name: </td>
<td><input type="text" name="firstName" size="50"/></td>
</tr>
<tr>
<td>Last Name: </td>
<td><input type="text" name="lastName" size="50"/></td>
</tr>
<tr>
<td>Portrait Photo: </td>
<td><input type="file" name="photo" size="50"/></td>
</tr>
<tr>
<td colspan="2">
<input type="submit" value="Save">
</td>
</tr>
</table>
</form>
</center>
</body>
</html>
This is my FileUploadDBServlet.
import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.Part;
#WebServlet(name = "FileUploadDBServlet", urlPatterns ={"/FileUploadDBServlet"})
public class FileUploadDBServlet extends HttpServlet {
// database connection settings
String dbURL = "jdbc:mysql://localhost:3306/rep";
String dbUser = "root";
String dbPass = "";
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
// gets values of text fields
String firstName = request.getParameter("firstName");
String lastName = request.getParameter("lastName");
InputStream inputStream=null; // input stream of the upload file
// obtains the upload file part in this multipart request
Part filePart = request.getPart("photo");
if (filePart != null) {
// prints out some information for debugging
System.out.println(filePart.getName());
System.out.println(filePart.getSize());
System.out.println(filePart.getContentType());
// obtains input stream of the upload file
inputStream = filePart.getInputStream();
}
//System.out.println(inputStream);
Connection conn = null; // connection to the database
String message = null; // message will be sent back to client
try {
// connects to the database
DriverManager.registerDriver(new com.mysql.jdbc.Driver());
conn = DriverManager.getConnection(dbURL, dbUser, dbPass);
// constructs SQL statement
String sql = "INSERT INTO contacts (first_name, last_name, photo) values (?, ?, ?)";
PreparedStatement statement = conn.prepareStatement(sql);
statement.setString(1, firstName);
statement.setString(2, lastName);
if (inputStream != null) {
// fetches input stream of the upload file for the blob column
statement.setBlob(3, inputStream);
}
// sends the statement to the database server
int row = statement.executeUpdate();
if (row > 0) {
message = "File uploaded and saved into database";
}
} catch (SQLException ex) {
message = "ERROR: " + ex.getMessage();
ex.printStackTrace();
} finally {
if (conn != null) {
// closes the database connection
try {
conn.close();
} catch (SQLException ex) {
ex.printStackTrace();
}
}
// sets the message in request scope
request.setAttribute("Message", message);
// forwards to the message page
getServletContext().getRequestDispatcher("/Message.jsp").forward(request, response);
}
}
}
And this is my Message.jsp
<%# page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd"/>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"/>
<title>Message</title>
</head>
<body>
<center>
<h3><%=request.getAttribute("Message")%></h3>
</center>
</body>
</html>
The message page displays "ERROR: No value specified for parameter 3".
So, I think null value is being stored in inputStream. Why is it so and how can it be handled?
Thanks.
You can use statement.setNull(3, java.sql.Types.BLOB); if yoúr inputstream is null.
if (inputStream != null) {
// fetches input stream of the upload file for the blob column
statement.setBlob(3, inputStream);
} else {
statement.setNull(3, java.sql.Types.BLOB);
}
As you are submitting form data with enctype="multipart/form-data" For this you have to mention #MultipartConfig(maxFileSize = "max file size") in your upload servlet.
Related
I am trying to retrieve data from one column of my table in MySQL and display the whole row in a .jsp file. Right now, when I run the code it prints the table with no values. As Shown here.
import java.sql.*;
import javax.servlet.*;
import javax.servlet.annotation.WebServlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.mysql.jdbc.PreparedStatement;
#WebServlet("/review")
public class findservlet1 extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = 8402378218178447403L;
public void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
// res.setContentType("text/html");
PrintWriter out = res.getWriter();
Connection conn = null;
//using movie_resolved view
try{
// Get a Connection to the database
String DB_CONNECTION_URL = "jdbc:mysql://localhost:3306/mydatabase";
String DB_USERNAME = "root";
String DB_PASSWORD = "root";
Class.forName("com.mysql.jdbc.Driver");
Connection con = DriverManager.getConnection(DB_CONNECTION_URL, DB_USERNAME, DB_PASSWORD);
// Create a Statement object
PreparedStatement st = (PreparedStatement) con.prepareStatement("SELECT * FROM coursereview");
ResultSet rs = st.executeQuery();
if (rs.next())
{
com.java.bean.coursereview Course = new com.java.bean.coursereview ();
Course.setCourse_id(rs.getString("courseid"));
Course.setCourserate(rs.getString("courserate"));
Course.setProfessor(rs.getString("professor"));
Course.setProrate(rs.getString("prorate"));
Course.setReview(rs.getString("review"));
req.setAttribute("Course", Course);
RequestDispatcher view = req.getRequestDispatcher("review.jsp");
view.forward(req, res);
}
}
catch(ClassNotFoundException e) {
out.println("Couldn't load database driver: " + e.getMessage());
}
catch(SQLException e) {
out.println("SQLException caught: " + e.getMessage());
}
finally {
// Always close the database connection.
try {
if (conn != null) conn.close();
}
catch (SQLException ignored) { }
}
}
}
Here is my reivew page:
<%# page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<link rel="stylesheet" href="styles/style1.css">
<meta http-equiv="Content-Type" content="text/css; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<div class="banner">
<img class="banner-image" src="images/uncclogo400.jpg"></div>
<h2>Review a Course</h2>
<table>
<TR>
<TD>Course ID: </TD>
<TD>${course.courseid}</TD>
</TR>
<TR>
<TD>Course Rate: </TD>
<TD>${course.courserate}</TD>
</TR>
<TR>
<TD>Professor: </TD>
<TD>${course.professor}</TD>
</TR>
<TR>
<TD>Professor Rate: </TD>
<TD>${course.prorate}</TD>
</TR>
<TR>
<TD>Review: </TD>
<TD>${course.review}</TD>
</TR>
</table>
</body>
</html>
I am trying to pull the values from the MySQL DB to print to the review.jsp page. Any ideas on what I am doing wrong?
Hello, I think it's a typo
Change this req.setAttribute("Course", Course); by this req.setAttribute("course", Course);
Best,
HTML form
<html>
<!--// This the client html page that receive data and uploads it.>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<body>
<center>
<h1>Task It User profile page</h1><br></br>
<form action="Upload" method="post" enctype="multipart/form-data">
<table border="0">
<tr>
<td>First Name: </td>
<td><input type="text" name="firstName" size="50"/></td>
</tr>
<tr>
<td>Last Name: </td>
<td><input type="text" name="lastName" size="50"/></td>
</tr>
<tr>
<td>Portrait Photo: </td>
<td><input type="file" name="photo" size="50"/></td>
</tr>
<tr>
<td colspan="2">
<input type="submit" value="Save">
</td>
</tr>
</table>
</form>
</center>
</body>
</html>
Servlet
package net.codejava.upload;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.Part;
#WebServlet("/Upload")
#MultipartConfig(maxFileSize = 16177215) // upload file's size up to 16MB
public class FileUpload extends HttpServlet {
// database connection settings
private String dbURL = "jdbc:mysql://localhost:3306/appdb";
private String dbUser = "root";
private String dbPass = "asdf";
#Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response);
}
#Override
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
// gets values of text fields
String firstName = request.getParameter("firstName");
String lastName = request.getParameter("lastName");
InputStream inputStream = null; // input stream of the upload file
// obtains the upload file part in this multipart request
Part filePart = request.getPart("photo");
if (filePart != null) {
// prints out some information for debugging
System.out.println(filePart.getName());
System.out.println(filePart.getSize());
System.out.println(filePart.getContentType());
// obtains input stream of the upload file
inputStream = filePart.getInputStream();
}
Connection conn = null; // connection to the database
String message = null; // message will be sent back to client
try {
// connects to the database
DriverManager.registerDriver(new com.mysql.jdbc.Driver());
conn = DriverManager.getConnection(dbURL, dbUser, dbPass);
// constructs SQL statement
String sql = "INSERT INTO contacts (first_name, last_name, photo) values (?, ?, ?)";
PreparedStatement statement = conn.prepareStatement(sql);
statement.setString(1, firstName);
statement.setString(2, lastName);
if (inputStream != null) {
// fetches input stream of the upload file for the blob column
statement.setBlob(3, inputStream);
}
// sends the statement to the database server
int row = statement.executeUpdate();
if (row > 0) {
message = "File uploaded and saved into database";
}
} catch (SQLException ex) {
message = "ERROR: " + ex.getMessage();
// ex.printStackTrace();
} finally {
if (conn != null) {
// closes the database connection
try {
conn.close();
} catch (SQLException ex) {
ex.printStackTrace();
}
}
// sets the message in request scope
request.setAttribute("Message", message);
// forwards to the message page
getServletContext().getRequestDispatcher("/message.jsp").forward(request, response);
}
}
}
The second code is the servlet code that i am trying to use to store data from client into the appdb
javax.servlet.ServletException: The request content-type is not a multipart/form-data is the error that i am getting.
I am very new this so if there is a trivial mistake, still answer the question
I am using the program from the site http://codejava.net/coding/upload-files-to-database-servlet-jsp-mysql that allows the user to upload files in the database. So far I have no troubles in inserting the data into the database.
I want to add a field named filename in the database. But I am unable to get the file name of the uploaded file. Is there a method for getting it? Or can I use BufferedReader to read the file?
FileUploadDB.java
package com.process.web.controller;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.Part;
#WebServlet("/fileuploaddb.html")
#MultipartConfig(maxFileSize = 16177215)
public class FileUploadDB extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request,response);
}
private String dbURL = "jdbc:jtds:sqlserver://localhost:1433;DatabaseName=ATS;SelectMethod=cursor;";
private String dbUser = "sa";
private String dbPass = "benilde";
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// gets values of text fields
String firstName = request.getParameter("firstName");
String lastName = request.getParameter("lastName");
InputStream inputStream = null; // input stream of the upload file
// obtains the upload file part in this multipart request
Part filePart = request.getPart("photo");
if (filePart != null) {
// prints out some information for debugging
System.out.println(filePart.getName());
System.out.println(filePart.getSize());
System.out.println(filePart.getContentType());
// obtains input stream of the upload file
inputStream = filePart.getInputStream();
}
Connection conn = null; // connection to the database
String message = null; // message will be sent back to client
try {
// connects to the database
//DriverManager.registerDriver(new com.mysql.jdbc.Driver());
//DriverManager.getConnection(dbURL);
//com.microsoft.sqlserver.jdbc.Driver
Class.forName("net.sourceforge.jtds.jdbc.Driver").newInstance();
conn = DriverManager.getConnection(dbURL, dbUser, dbPass);
if(conn!=null) {
System.out.println("Connection Successful!");
} else {
System.out.println("Error in Connection");
}
// constructs SQL statement
String sql = "INSERT INTO contact (firstname, lastname, photo) values (?, ?, ?)";
PreparedStatement statement = conn.prepareStatement(sql);
statement.setString(1, firstName);
statement.setString(2, lastName);
if (inputStream != null) {
// fetches input stream of the upload file for the blob column
statement.setBinaryStream(3, filePart.getInputStream(), (int)(filePart.getSize()));
}
// sends the statement to the database server
int row = statement.executeUpdate();
if (row > 0) {
message = "File uploaded and saved into database";
}
} catch (SQLException ex) {
message = "ERROR: " + ex.getMessage();
ex.printStackTrace();
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InstantiationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
if (conn != null) {
// closes the database connection
try {
conn.close();
} catch (SQLException ex) {
ex.printStackTrace();
}
}
// sets the message in request scope
request.setAttribute("Message", message);
// forwards to the message page
getServletContext().getRequestDispatcher("/Message.jsp").forward(request, response);
}
}
}
This is the upload.jsp
<%# page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>File Upload to Database Demo</title>
</head>
<body>
<center>
<h1>File Upload to Database Demo</h1>
<form method="post" action="fileuploaddb.html" enctype="multipart/form-data">
<table border="0">
<tr>
<td>First Name: </td>
<td><input type="text" name="firstName" size="50"/></td>
</tr>
<tr>
<td>Last Name: </td>
<td><input type="text" name="lastName" size="50"/></td>
</tr>
<tr>
<td>Portrait Photo: </td>
<td><input type="file" name="photo" size="50"/></td>
</tr>
<tr>
<td colspan="2">
<input type="submit" value="Save">
</td>
</tr>
</table>
</form>
</center>
</body>
</html>
**This is the Message.jsp**
<%# page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Message</title>
</head>
<body>
<center>
<h3><%=request.getAttribute("Message")%></h3>
</center>
</body>
</html>
**On this part, the System.out.println(filePart.getName()); does not print the file
name of the selected file to be uploaded, but it prints out the word "photo".
Which is from
Part filePart = request.getPart("photo");
if (filePart != null) {
// prints out some information for debugging
System.out.println(filePart.getName());
System.out.println(filePart.getSize());
System.out.println(filePart.getContentType());
// obtains input stream of the upload file
inputStream = filePart.getInputStream();
}
Use the following method
private String getFileName(Part p){
String header=p.getHeader("content-disposition");
String filename = header.substring(header.indexOf("filename=\"")).split("\"")[1]; //getting filename
return filename;
}
The snippet is taken from my blog here
I have no troubles in inserting the data into the database but I am unable to get the file name of the uploaded file. Is there a method for getting it?
Since Servlet API 3.1, the Part interface provides the getSubmittedFileName() method which does what you need.
Gets the file name specified by the client
This class represents a part or form item that was received within a multipart/form-data POST request.
Alternatively you can use Commons Fileupload library provided by Apache that makes it easy to add robust, high-performance, file upload capability to your servlets and web applications.
Sample code:
List<FileItem> multiparts = new ServletFileUpload(
new DiskFileItemFactory()).parseRequest(request);
for(FileItem item : multiparts){
if(!item.isFormField()){
String name = new File(item.getName()).getName();
}
}
Find complete code here and here
I am newbie here. I have an assignment that requires to connect mysql, servlet and java (because i want to separate java code and html code. Previously, i combined the codes to make it easier and was rejected)
So, basically, in mySql i write this,
create table login2 (username varchar (30), password varchar(30), designation varchar(10));
insert into login2 values('lala','123','A');
and i create loginDisp.java in the servlet using eclipse. This is my command
package Servlet;
import java.io.*;
import java.util.*;
import javax.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class loginDisp extends HttpServlet {
public void service(HttpServletRequest request,
HttpServletResponse response)
throws IOException, ServletException{
// String username=request.getParameter("Username");
// String password=request.getParameter("Password");
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<head><title>Servlet JDBC</title></head>");
out.println("<body>");
out.println("<h1>Servlet JDBC</h1>");
out.println("</body></html>");
// connecting to database
Connection con = null;
Statement stmt = null;
ResultSet rs = null;
try {
Class.forName("com.mysql.jdbc.Driver");
con =DriverManager.getConnection
("url/tablename","uname","pssword");
stmt = con.createStatement();
rs = stmt.executeQuery("SELECT * FROM login2");
// displaying records
while(rs.next()){
out.print(rs.getObject(1).toString());
out.print("\t\t\t");
out.print(rs.getObject(2).toString());
out.print("<br>");
}
} catch (SQLException e) {
throw new ServletException("Servlet Could not display records.", e);
} catch (ClassNotFoundException e) {
throw new ServletException("JDBC Driver not found.", e);
} finally {
try {
if(rs != null) {
rs.close();
rs = null;
}
if(stmt != null) {
stmt.close();
stmt = null;
}
if(con != null) {
con.close();
con = null;
}
} catch (SQLException e) {}
}
out.close();
}
}
When i execute, it is well displayed. Hence, i started to make the Login.jsp as i want to make a text.box for user to insert username and password. This is my code
<%# page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<body>
<center>
<div class="wrapper">
<br>
<br>
<h2>Doctor</h2>
<form name="form1" method="post" action="loginDisp" > <!-- onsubmit="return validateForm()" -->
<table width="326" border="1" align="center">
<center> <tr>
<th width="138" scope="row">Username</th>
<td width="142"><input type="text" name="Username"></td>
</tr>
</center>
<tr>
<th height="31" style="width: 162px;"><span class="style2">Password</span>
</th>
<td width="142"><input type="password" name="Password"></td>
</tr>
<tr>
</tr>
</table>
<p align="center">
<input type="submit" name="Submit" value="Submit">
</p> ${message}
</form>
</div>
</center>
</body>
</body>
</html>
and I get the data from mySQL displayed. I add another log.java in servlet because i thought when we need a data fetched from jsp to databased and displayed when be called. This is code in log.java
package Servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class log extends HttpServlet {
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//Get username and password from the JSP page
String username=request.getParameter("Username");
String password=request.getParameter("Password");
//Print the above got values in console
System.out.println("The username is" +username);
System.out.println("\nand the password is" +password);
}
}
The username and password inserted in login.jsp does not inserted automatically in mySQL, hence when i try to executed loginDisp.java , it will display only the data i inserted manually in mySQL.
You can not use the java file name as action this is defined in the web.xml file and there is servlet mapping and you can use
<servlet>
<servlet-name>log</servlet-name>
<servlet-class>loginDisplay</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>log</servlet-name>
<url-pattern>/loginDisplay</url-pattern>
</servlet-mapping>
and now you can use the action = "loginDisplay" in the action tag and by using this
I hope you did not face the problem of 404 error.
You entered a wrong action in form.
Since form's action attribute takes the path of the servlet you should give the relavent mapping specified in web.xml
action="loginDisplay.java"
should be action="/loginDisplay"
<form name="form1" method="post" action="loginDisplay.java" onsubmit="return validateForm()">
It should be
<form name="form1" method="post" action="/loginDisplay" onsubmit="return validateForm()">
If /loginDisplay is not the exact mapping in your web.xml check the web.xml file and see the mapping for loginDisplay and give that path as action.
A quick example
Create a new package (called dao or model) where you put your logic to access to the DB.
Then create a Java Bean Object where store the results of your DB and instanciate your class of the logic in the servlet, then access to the properties of the Bean and show it in the WEB.
package model:
class DaoAccess (methods to connect with DB)
class Login (properties of the table with getXXX and setXXX of each one)
package Servlet.
class loginDisplay:
public class loginDisplay extends HttpServlet {
public void service(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<head><title>Servlet JDBC</title></head>");
out.println("<body>");
out.println("<h1>loginDisplay</h1>");
out.println("</body></html>");
// connecting to database
Connection con = null;
Statement stmt = null;
ResultSet rs = null;
DaoAccess dao = new DaoAccess();
List<Login> list = dao.readAll();
for(Login obj: list){
out.write(obj.getName());
out.write(obj.getPassword());
}
out.close();
}
}
I am trying to pass username and password from a jsp page to Authenticate Method in a Java class (LogMeIn.java), but I am getting 'false' as a result. However when I hard code values (abc/abc) I do get 'pass' result. ie. it's successful.
Please can you advise why it's not accepting the parameters passed through jsp?
--LogMeIn.java--
package org.cms.model;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.PreparedStatement;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.sql.DataSource;
public class LogMeIn {
public boolean Authenticate( String username, String password ) {
Connection connection = null;
// Statement statement = null;
ResultSet resultSet = null;
PreparedStatement pst = null;
String query;
boolean result = false;
try {
Context initCtx = new InitialContext();
Context envCtx = (Context) initCtx.lookup("java:comp/env");
DataSource ds = (DataSource) envCtx.lookup("jdbc/TestDB");
connection = ds.getConnection();
//statement = connection.createStatement();
query = "select name from account where name= ? and password = ?";
pst = connection.prepareStatement(query);
pst.setString(1, username);
pst.setString(2, password);
resultSet = pst.executeQuery();
int count=0;
if(resultSet.next())
{
count++;
}
if(count>0)
{
result = true;
}
else
{
result = false;
}
}
catch (SQLException e){
e.printStackTrace();
}
catch (Exception e){
e.printStackTrace();
}
finally {
if (resultSet != null) try { resultSet.close(); } catch (SQLException logOrIgnore) {}
if (connection != null) try { connection.close(); } catch (SQLException logOrIgnore) {}
}
return result;
}
}
---LoginServlet---
package org.cms.controller;
import java.io.IOException;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.cms.model.LogMeIn;
/**
* Servlet implementation class LoginServlet
*/
#WebServlet("/LoginServlet")
public class LoginServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* #see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String username;
String password;
username = request.getParameter("user");
password = request.getParameter("pass");
LogMeIn a = new LogMeIn();
boolean result = a.Authenticate(username, password);
System.out.println(result);
if (result) {
request.setAttribute("loginresult","Pass");
RequestDispatcher dispatcher = request.getRequestDispatcher("Login.jsp");
dispatcher.forward(request, response);
}
else {
request.setAttribute("loginresult","Failed");
RequestDispatcher dispatcher = request.getRequestDispatcher("Login.jsp");
dispatcher.forward(request, response);
}
}
}
---Login.jsp---
<%# page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%# taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%# taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>Login</title>
<link rel="stylesheet" href="css/style.css" type="text/css"></link>
<script language="JavaScript" type="text/JavaScript" src="validate.js"> </script>
</head>
<body>
<form enctype="multipart/form-data" onSubmit="return validate(this)" method="post" action="LoginServlet" class="form">
<table border = "0">
<tr align="left" valign="top">
<td>User Name:</td>
<td><input type="text" name ="user" class="inputbox"/></td>
</tr>
<tr align="left" valign="top">
<td>Password:</td>
<td><input type="password" name ="pass" class="inputbox" /></td>
</tr>
<tr align="left" valign="top">
<td></td>
<td><input type="submit" name="submit"
value="submit" class="fb8"/></td>
</tr>
</table>
<c:out value="${loginresult}" > </c:out>
</form>
</body>
</html>
Many Thanks
use setAttribute() method. This method sets the value of the attribute for the request which is retrieved later in the servlet by passing the request object through the dispatcher method. The set value of the attribute is retrieved by the getAttribute() method of the request object.
http://www.roseindia.net/servlets/request-parameter.shtml
http://www.roseindia.net/tutorial/servlet/passParameters.html