Spring MVC

Spring MVC helps in building flexible and loosely coupled web applications. The Model-view-controller design pattern helps in seperating the business logic, presentation logic and navigation logic. Models are responsible for encapsulating the application data. The Views render response to the user with the help of the model object . Controllers are responsible for receiving the request from the user and calling the back-end services.

When a request is sent to the Spring MVC Framework the following sequence of events happen.

• The DispatcherServlet first receives the request.
• The DispatcherServlet consults the HandlerMapping and invokes the Controller associated with the request.
• The Controller process the request by calling the appropriate service methods and returns a ModeAndView object to the DispatcherServlet. The ModeAndView object contains the model data and the view name.
• The DispatcherServlet sends the view name to a ViewResolver to find the actual View to invoke.
• Now the DispatcherServlet will pass the model object to the View to render the result.
• The View with the help of the model data will render the result back to the user.

The new Servlet
•DispatcherServlet requests are mapped to @Controller methods
–@RequestMapping annotation used to define mapping rules
–Method parameters used to obtain request input
–Method return values used to generate responses
•Simplest possible @Controller

@Controller
public class HelloController {
    @RequestMapping(“/”)
    public @ResponseBody String hello() {
        return “Hello World”;
    }
}

Mapping Requests
•By path
–@RequestMapping(“path”)
•By HTTP method
–@RequestMapping(“path”,method=RequestMethod.GET)
–POST,PUT,DELETE,OPTIONS and TRACE are also supported
•By presence of query parameter
–@RequestMapping(“path”,method=RequestMethod.GET,params=“foo”)
–Negation also supported: params={“foo”,”!bar”}
•By presence of request header
–@RequestMapping(“path”,header=“content-type=text/*”)
–Negation also supported

For more details : Click Here

For tutorial: http://waheedtechblog.blogspot.in/2012/08/spring-mvc-tutorial.html
 

Sending Email Via JavaMail API Example

From last one month, My internet device is missing from my terrace. So, Mostly I use mobile to access my mail but accessing mail via mobile is very irritating thing because of the slow bandwidth. To send one single mail I have to wait till the mailbox get opened.

This is very simple way to send mail without opening your account. :)

This is the example to show you how to use JavaMail API method to send an email via Gmail SMTP server.

You need mail.jar library to run this code.


import java.util.Properties;

import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

/**
 * @author abdul
 *
 */
public class SendEmail {

    public static void main(String[] args) {
       
        final String username="YOUR_USER_NAME"; //abdulwaheed18
        final String password="YOUR_PASSWORD";   //*******
        final String to = "SENDER_EMAIL"; // abdulwaheed143@yahoo.co.in
        final String from = "YOUR_EMAIL"; // abdulwaheed18@gmail.com

       
        Properties props = new Properties();
        props.put("mail.smtp.host", "smtp.gmail.com");
        props.put("mail.smtp.socketFactory.port", "465");
        props.put("mail.smtp.socketFactory.class",
        "javax.net.ssl.SSLSocketFactory");
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.port", "465");

        Session session = Session.getDefaultInstance(props,
                new javax.mail.Authenticator() {
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(username,password);
            }
        });

        try {
            Message message = new MimeMessage(session);
            message.setFrom(new InternetAddress(to));
            message.setRecipients(Message.RecipientType.TO,
                    InternetAddress.parse(from));
            message.setSubject("Hi");
            message.setText("Hi User,\n Surprise Message.\n Regards,\nWaheed");
            Transport.send(message);
            System.out.println(“Message sent Successfully");
        } catch (MessagingException e) {
            throw new RuntimeException(e);
        }
    }
}

Gmail SMTP Detail : http://support.google.com/mail/bin/answer.py?hl=en&answer=13287

Spring Auto-Wiring Beans with @Autowired annotation

In Spring, you can use @Autowired annotation to auto wire bean on the setter method, constructor or a field.

There are two ways to can achieve it :
1.Using <context:annotation-config />
    Just Add Spring context and <context:annotation-config /> in bean configuration file

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
    http://www.springframework.org/schema/aop
    http://www.springframework.org/schema/aop/spring-aop.xsd
    http://www.springframework.org/schema/tx
    http://www.springframework.org/schema/tx/spring-tx.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-3.0.xsd">

    <context:annotation-config />

</beans>
    
2. Using AutowiredAnnotationBeanPostProcessor
Add 'AutowiredAnnotationBeanPostProcessor' directly in your bean configuration file.

<bean 
class="org.springframework.beans.factory.annotation

.AutowiredAnnotationBeanPostProcessor"/>

And in Class, Just add annotation @Autowired above the setter function as seen below , You can do the same on constructor too:
class A {
private B b;

   @Autowired
   public void setB(B b) {
      this.b = b;
   }
}

Error:No Hibernate Session bound to thread, and configuration does not allow creation of non-transactional one here

To solve this problem. You have to do two things:

1. mark the DAO as transactional or function which is doing database call like:

  @Transactional
   public class EmployeeDaoImpl  extends DaoImpl implements EmployeeDao{
 /////
}
           OR
@Transactional
    public long addEmployee(Employee employee) {
        System.out.println("Employee:"+employee );
        long id = employeeDao.addEmployee(employee);
        System.out.println("Id1: " );
        return id;
    }


2. Enable the annotation driven transcation management in applicationContext.xml (where your beans are defined):


<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
    http://www.springframework.org/schema/aop
    http://www.springframework.org/schema/aop/spring-aop.xsd
    http://www.springframework.org/schema/tx
    http://www.springframework.org/schema/tx/spring-tx.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-3.0.xsd">
<!-- Main transaction manager for accessing internal DB -->
    <bean id="transactionManager"
        class="org.springframework.orm.hibernate3.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory" />
    </bean>
   
    <!-- enable the configuration of transactional behavior based on annotations -->
  <tx:annotation-driven transaction-manager="transactionManager"/>

That's it. Hope it works for other too.

Keyboard Shortcuts That Work in All Web Browsers

Tabs

Ctrl+1-8 – Switch to the specified tab, counting from the left.
Ctrl+9 – Switch to the last tab.
Ctrl+Tab – Switch to the next tab – in other words, the tab on the right. (Ctrl+Page Up also works, but not in Internet Explorer.)
Ctrl+Shift+Tab – Switch to the previous tab – in other words, the tab on the left. (Ctrl+Page Down also works, but not in Internet Explorer.)
Ctrl+W, Ctrl+F4 – Close the current tab.
Ctrl+Shift+T – Reopen the last closed tab.
Ctrl+T – Open a new tab.
Ctrl+N – Open a new browser window.
Alt+F4 – Close the current window. (Works in all applications.)

Mouse Actions for Tabs

Middle Click a Tab – Close the tab.
Ctrl+Left Click, Middle Click – Open a link in a background tab.
Shift+Left Click – Open a link in a new browser window.
Ctrl+Shift+Left Click – Open a link in a foreground tab.

Navigation

Alt+Left Arrow, Backspace – Back.
Alt+Right Arrow, Shift+Backspace – Forward.
F5 – Reload.
Ctrl+F5 – Reload and skip the cache, re-downloading the entire website.
Escape – Stop.
Alt+Home – Open homepage.

Zooming

Ctrl and +, Ctrl+Mousewheel Up – Zoom in.
Ctrl and -, Ctrl+Mousewheel Down — Zoom out.
Ctrl+0 – Default zoom level.
F11 – Full-screen mode.

Scrolling

Space, Page Down – Scroll down a frame.
Shift+Space, Page Up – Scroll up a frame.
Home – Top of page.
End – Bottom of page.
Middle Click – Scroll with the mouse. (Windows only)

Address Bar

Ctrl+L, Alt+D, F6 – Focus the address bar so you can begin typing.
Ctrl+Enter – Prefix www. and append .com to the text in the address bar, and then load the website. For example, type howtogeek into the address bar and press Ctrl+Enter to open www.howtogeek.com.
Alt+Enter – Open the location in the address bar in a new tab.

Search

Ctrl+K, Ctrl+E – Focus the browser’s built-in search box or focus the address bar if the browser doesn’t have a dedicated search box. (Ctrl+K doesn’t work in IE, Ctrl+E does.)
Alt+Enter – Perform a search from the search box in a new tab.
Ctrl+F, F3 – Open the in-page search box to search on the current page.
Ctrl+G, F3 – Find the next match of the searched text on the page.
Ctrl+Shift+G, Shift+F3 – Find the previous match of the searched text on the page.

History & Bookmarks

Ctrl+H – Open the browsing history.
Ctrl+J – Open the download history.
Ctrl+D – Bookmark the current website.
Ctrl+Shift+Del – Open the Clear Browsing History window.

Other Functions

Ctrl+P – Print the current page.
Ctrl+S – Save the current page to your computer.
Ctrl+O – Open a file from your computer.
Ctrl+U – Open the current page’s source code. (Not in IE.)
F12 – Open Developer Tools. (Requires Firebug extension for Firefox.)

Use mySQl setup from your virtual machine

Have you ever faced a situation where you want to use your MYSQl from your virtual machine. i,e your MYSQL set up is on the windows and your linux is on VM player and you want to use it rather than installing it again on linux box.

If yes, Then here is the solution.

My System configuration where I have tested.
OS : Windows 7
MYSQL: version 5.5 on windows
RHEL 5 on VM player

Step:

1 . Open MYSQL workbench 5
2.  Open your MYSQL from server Administrator.
3.  Goto Security -> Users and Privileges
4.  Replace 'localhost' with '%' in limited connectivity to host matching box.

And you are done here..:)

All credit goes to my Manager..Thanx a lot..:)

List all xml files from the JAR.

Do you want to know which all files are in the jar without extracting it.?

This is a small tutorial where I am listing all the xml files.

import java.io.IOException;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;

/**
 * List the name of all xml which is in given jars
 *
 * @author abdul
 */
public class ListXmlFiles {
    /* Stores the xml file name*/
    List<String> list = new ArrayList<String>();

    public List<String> getList() {
        return list;
    }

    /**
     * @param args
     * @throws IOException
     */
    public static void main(String[] args) throws IOException {
        ListXmlFiles xmlFiles = new ListXmlFiles();
        JarFile jarFile = new JarFile("./lib/dummyJar.jar");
        Enumeration<JarEntry> e = jarFile.entries();
        while (e.hasMoreElements()) {
            xmlFiles.process(e.nextElement());
        }
        System.out.println("List:" + xmlFiles.getList());
    }

    private void process(Object obj) {
        JarEntry entry = (JarEntry)obj;
        String name = entry.getName();
        if(name.endsWith(".xml")) {
            list.add(name);      
        }
    }
}

If you want to know all the files name inside,Just removed the if-else filter, It will add all  the filename into the list.
private void process(Object obj) {
        JarEntry entry = (JarEntry)obj;
        String name = entry.getName();
        list.add(name);        
}