Java help
Monday, October 22, 2012
Encrypt
import java.security.InvalidKeyException;
import java.security.Key;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyGenerator;
public class EncryptDemo {
static String algorithm = "DESede";
static Key key;
static Cipher cipher;
public static void main(String[] args) throws Exception {
key= KeyGenerator.getInstance(algorithm).generateKey();
cipher = Cipher.getInstance(algorithm);
byte[] encryptionBytes = encrypt("Om Prakash");
System.out.println(encryptionBytes);
System.out.println("Recovered: " + decrypt(encryptionBytes));
}
private static byte[] encrypt(String input) throws InvalidKeyException, BadPaddingException,
IllegalBlockSizeException {
cipher.init(Cipher.ENCRYPT_MODE, key);
byte[] inputBytes = input.getBytes();
return cipher.doFinal(inputBytes);
}
private static String decrypt(byte[] encryptionBytes) throws InvalidKeyException,
BadPaddingException, IllegalBlockSizeException {
cipher.init(Cipher.DECRYPT_MODE, key);
byte[] recoveredBytes = cipher.doFinal(encryptionBytes);
String recovered = new String(recoveredBytes);
return recovered;
}
}
Monday, October 8, 2012
hibernate.cfg.xml
<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql:///omdata</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">root</property>
<property name="hibernate.connection.pool_size">10</property>
<property name="show_sql">true</property>
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="hibernate.hbm2ddl.auto">update</property>
<!-- Mapping files -->
<mapping resource="employee.hbm.xml"/>
</session-factory>
</hibernate-configuration>
employee.hbm.xml
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="pack.Employee" table="EMP">
<id name="eid" type="long" column="EID" >
<generator class="assigned"/>
</id>
<property name="ename">
<column name="EMPNAME" />
</property>
</class>
</hibernate-mapping>
Employee.java
package pack;
public class Employee {
private String ename;
private long eid;
public void setEid(long l) {
eid = l;
}
public long getEid() {
return eid;
}
public void setEname(String ename) {
this.ename = ename;
}
public String getEname() {
return ename;
}
}
Main.java
package pack;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.Transaction;
public class Main {
public static void main(String[] args) {
Session session = null;
try{
// This step will read hibernate.cfg.xml and prepare hibernate for use
SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
session =sessionFactory.openSession();
Transaction transaction = null;
transaction = session.beginTransaction();
//Create new instance of Contact and set values in it by reading them from form object
System.out.println("Inserting Record");
Employee e = new Employee();
e.setEid(3);
e.setEname("Prakash om");
session.save(e);
transaction.commit();
System.out.println("Done");
}catch(Exception e){
System.out.println(e.getMessage());
}finally{
// Actual contact insertion will happen at this step
//session.flush();
//session.close();
} }}
InputForm.java
package pack;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class InputForm extends JFrame implements ActionListener
{
JTextField tId=new JTextField();
JTextField tName=new JTextField();
JLabel lbl=new JLabel();
JButton btn=new JButton("Save");
InputForm()
{
JPanel p1=new JPanel();
setLayout(null);
p1.setLayout(new GridLayout(4,1));
getContentPane().add(p1);
p1.setBounds(50,50,200,150);
p1.add(tId);
p1.add(tName);
p1.add(btn);
p1.add(lbl);
setSize(300,300);
setVisible(true);
btn.addActionListener(this);
}
public void actionPerformed(ActionEvent ev)
{
String ename=tName.getText();
int eid=0;
try{
eid=Integer.parseInt(tId.getText());
SaveInputForm sif=new SaveInputForm(eid,ename);
lbl.setText(sif.status);
}
catch(Exception e)
{
System.out.println(e.getMessage());
lbl.setText(e.getMessage());
}
}
public static void main(String arg[])
{
new InputForm();
}
}
SaveInputForm.java
package pack;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.Transaction;
public class SaveInputForm {
String status;
SaveInputForm(int eid,String ename)
{
Session session = null;
try{
// This step will read hibernate.cfg.xml and prepare hibernate for use
@SuppressWarnings("deprecation")
SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
session =sessionFactory.openSession();
Transaction transaction = null;
transaction = session.beginTransaction();
//Create new instance of Contact and set values in it by reading them from form object
System.out.println("Inserting Record");
Employee e = new Employee();
e.setEid(eid);
e.setEname(ename);
session.save(e);
transaction.commit();
System.out.println("Done");
status="Success";
}catch(Exception e){
System.out.println(e.getMessage());
status=e.getMessage();
}finally{
// Actual contact insertion will happen at this step
//session.flush();
//session.close();
}
}
}
Sunday, September 16, 2012
Automatic Validation in Struts
order-form.jsp
<HTML>
<HEAD><TITLE>Order</TITLE></HEAD>
<BODY BGCOLOR="#FDF5E6"><CENTER>
<%@ taglib
uri="http://struts.apache.org/tags-html" prefix="html"
%>
<%@ taglib
uri="http://struts.apache.org/tags-bean" prefix="bean"
%>
<html:errors/>
<html:form action="order"
onsubmit="return validateOrderFormBean(this);">
<bean:message key="inputForm.firstName" />
<html:text property="firstName"/><BR>
<html:submit value="Order Now!"/>
</html:form>
<html:javascript formName="orderFormBean"/>
</CENTER></BODY></HTML>
web.xml
<?xml version="1.0"
encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>DemoStruts</display-name>
<servlet>
<servlet-name>action</servlet-name>
<servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
<init-param>
<param-name>config</param-name>
<param-value>/WEB-INF/struts-config.xml</param-value>
</init-param>
<load-on-startup>2</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>action</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
</welcome-file-list>
</web-app>
struts-config.xml
<struts-config>
<form-beans>
<form-bean name="orderFormBean"
type="omservlet.OrderFormBean"/>
</form-beans>
<action-mappings>
<action path="/order"
type="omservlet.Order"
name="orderFormBean"
scope="request"
input="/order-form.jsp">
<forward name="success"
path="/WEB-INF/results/order-confirmation.jsp"/>
</action>
</action-mappings>
<message-resources parameter="MessageResources"/>
<plug-in
className="org.apache.struts.validator.ValidatorPlugIn">
<set-property
property="pathnames"
value="/WEB-INF/validator-rules.xml,/WEB-INF/validation.xml"/>
</plug-in>
</struts-config>
MessageResources.properties
# -- Custom messages for this
application --
inputForm.firstName=First name
# -- Standard errors --
errors.header=<UL>
errors.prefix=<LI><B><FONT COLOR="RED">
errors.suffix=</FONT></B></LI>
errors.footer=</UL>
# -- validator --
errors.required={0}
is required.
validator-rules.xml
<!DOCTYPE form-validation
PUBLIC
"-//Apache Software Foundation//DTD
Commons Validator Rules Configuration 1.1.3//EN"
"http://jakarta.apache.org/commons/dtds/validator_1_1_3.dtd">
<form-validation>
<global>
<validator name="required"
classname="org.apache.struts.validator.FieldChecks"
method="validateRequired"
methodParams="java.lang.Object,
org.apache.commons.validator.ValidatorAction,
org.apache.commons.validator.Field,
org.apache.struts.action.ActionMessages,
javax.servlet.http.HttpServletRequest"
msg="errors.required"/>
</global>
</form-validation>
Validation.xml
<?xml version="1.0"
encoding="ISO-8859-1" ?>
<!DOCTYPE form-validation
PUBLIC
"-//Apache Software Foundation//DTD
Commons Validator Rules Configuration 1.1.3//EN"
"http://jakarta.apache.org/commons/dtds/validator_1_1_3.dtd">
<form-validation>
<formset>
<form name="orderFormBean">
<field property="firstName"
depends="required">
<arg0 key="inputForm.firstName"/>
</field>
</form>
</formset>
</form-validation>
OrderFormBean.java
package omservlet;
import
org.apache.struts.validator.*;
public class OrderFormBean
extends ValidatorForm {
// setter and getter methods.
}
Order.java
package omservlet;
import javax.servlet.http.*;
import org.apache.struts.action.*;
public class Order extends Action {
public
ActionForward execute(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse
response)
throws
Exception {
return(mapping.findForward("success"));
}
}
order-confirmation.jsp
<!DOCTYPE HTML
PUBLIC "-//W3C//DTD
HTML 4.0 Transitional//EN">
<HTML>
<HEAD><TITLE>Thanks for
Ordering</TITLE></HEAD>
<BODY BGCOLOR="#FDF5E6">
<CENTER>
<H1>Thanks for
Ordering</H1>
</CENTER>
</BODY></HTML>
Monday, July 23, 2012
1.3. Basic Struts Example
WEB-INF\results\
bad-address.jsp
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><HTML>
<HEAD><TITLE>Illegal Email Address</TITLE></HEAD>
<BODY BGCOLOR="#FDF5E6">
<CENTER>
<H1>invalid Email Address</H1>
Please <A HREF="index.jsp">try again</A>.
</CENTER>
</BODY></HTML>
bad-password.jsp
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD><TITLE>invalid password</TITLE></HEAD>
<BODY BGCOLOR="#FDF5E6">
<CENTER>
<H1>invalid password</H1>
Please <A HREF="index.jsp">try again</A>.
</CENTER>
</BODY></HTML>
confirm.jsp
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<%@ taglib uri="http://struts.apache.org/tags-bean" prefix="bean" %>
<HTML>
<HEAD><TITLE>Success</TITLE></HEAD>
<BODY BGCOLOR="#FDF5E6">
<CENTER>
<H1>You are login successfully.</H1>
<bean:write name="userFormBean" property="name" />
Congratulations.
</CENTER>
</BODY></HTML>
1.2 Basic Struts Example
RegisterAction1.java
package coreservlets;import javax.servlet.http.*;
import org.apache.struts.action.*;
public class RegisterAction1 extends Action {
public ActionForward execute(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response)
throws Exception {
UserFormBean userBean = (UserFormBean)form;
String email = userBean.getEmail();
String password = userBean.getPassword();
if(email.equals("om@gmail.com"))
{
if(password.equals("om"))
return(mapping.findForward("success"));
else
return(mapping.findForward("bad-password"));
}
else
return(mapping.findForward("bad-address"));
}
}
1.1. Basic Struts Example...
UserFormBean.java
package coreservlets;import java.sql.*;
import org.apache.struts.action.*;
public class UserFormBean extends ActionForm {
private String email = "Missing address";
private String password = "Missing password";
public String getEmail() {
return(email);
}
public String getName()
{
Connection con=null;
String name="not defined";
try{
Class.forName("com.mysql.jdbc.Driver");
con=DriverManager.getConnection("jdbc:mysql:///omdatabase","root","root");
Statement stat=con.createStatement();
ResultSet rs=stat.executeQuery("Select * from Student");
while(rs.next())
{
name=rs.getString(1);
}
}
catch(Exception ex)
{
name=""+ex;
}
return name;
}
public void setEmail(String email) {
this.email = email;
}
public String getPassword() {
return(password);
}
public void setPassword(String password) {
this.password = password;
}
}
1.0.Basic Struts Example
index.jsp
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><HTML>
<HEAD><TITLE>New Account Registration</TITLE></HEAD>
<BODY BGCOLOR="#FDF5E6">
<CENTER>
<H1>New Account Registration</H1>
<FORM ACTION="register1.do" METHOD="POST">
Email address: <INPUT TYPE="TEXT" NAME="email"><BR>
Password: <INPUT TYPE="PASSWORD" NAME="password"><BR>
<INPUT TYPE="SUBMIT" VALUE="Sign in me!">
</FORM>
</CENTER>
</BODY></HTML>
\WEB-INF
web.xml
<web-app>
<!-- Standard Action Servlet Configuration -->
<servlet>
<servlet-name>action</servlet-name>
<servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
<init-param>
<param-name>config</param-name>
<param-value>/WEB-INF/struts-config.xml</param-value>
</init-param>
</servlet>
<!-- Standard Action Servlet Mapping -->
<servlet-mapping>
<servlet-name>action</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
</web-app>
struts-config.xml
<struts-config>
<form-beans>
<form-bean name="userFormBean"
type="coreservlets.UserFormBean"/>
</form-beans>
<global-forwards>
<forward name="success"
path="/WEB-INF/results/confirm.jsp"/>
</global-forwards>
<action-mappings>
<action path="/register1"
type="coreservlets.RegisterAction1"
name="userFormBean"
scope="request">
<forward name="bad-password"
path="/WEB-INF/results/bad-password.jsp"/>
<forward name="bad-address"
path="/WEB-INF/results/bad-address.jsp"/>
</action>
</action-mappings>
</struts-config>
Note- struts.jar must be in /WEB-INF/lib
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