Android Application to understand Menu Options and Changing Color accordingly

Question -7

Understand Menu option.
a. Create an application that will change color of the screen, based on selected options from the
menu.

---

Step 1: Create New Project in eclipse.


Step 2: Edit MainActivity XML file in folder res/layout folder of your project

<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
 
    <RelativeLayout
        android:id="@+id/mainlayout"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" >

        <TextView
            android:id="@+id/tv1"
            android:gravity="center"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:text="Menu Color Change"
            android:textSize="40dp" />

    </RelativeLayout>

</TableLayout>

Step 3: Edit MenuActivity XML file in folder res/menu folder of  your project

<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:id="@+id/itemBlue"
        android:title="Blue Background."
        />
    <item
        android:id="@+id/itemGreen"
        android:title="Green Background."
        />
</menu>

Step 4: Edit MainActivity Java file in folder src/package/ folder of your project

package com.example.MenuOption;

import android.os.Bundle;
import android.app.Activity;
import android.graphics.Color;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.RelativeLayout;
import android.support.v4.app.NavUtils;

public class MenuOption extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_menu_option);
   
     
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu)
    {
        getMenuInflater().inflate(R.menu.menuoption, menu);
        super.onCreateOptionsMenu(menu);
        return true;
    }

@Override
public boolean onOptionsItemSelected(MenuItem item)
{
// TODO Auto-generated method stub
super.onOptionsItemSelected(item);
RelativeLayout rl = (RelativeLayout)findViewById(R.id.mainlayout);

switch(item.getItemId())
{

case R.id.itemBlue:
rl.setBackgroundColor(Color.BLUE);
break;

case R.id.itemGreen:
rl.setBackgroundColor(Color.GREEN);
break;

}
return false;
}
 

 
}

---

Android Application to Understand Spinner value changing images

Question - 6

Understand resource folders :
a. Create spinner with strings taken from resource folder(res >> value folder).
b. On changing spinner value, change image.

---

Step 1: Create New Project in eclipse and go to res/layout folder.


Step 2: Add 5 Images of your choice into res/drawable-hdpi/ folder of your project.

Step 3: Edit Activity_Spinner XML file in res/layout/ folder of your project.

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <Spinner
        android:id="@+id/spinner1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:entries="@array/Spinner"
        />

    <ImageView
        android:id="@+id/imgview1"
        android:contentDescription="@string/imgviewer"
        android:layout_width="match_parent"
        android:layout_height="fill_parent"
        android:layout_below="@+id/spinner1"
        android:src="@drawable/image1" />

</RelativeLayout>

Step 4: Edit Activity Spinner Java file in src/package/ folder of your project.

package com.example.Spinner;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ImageView;
import android.widget.Spinner;
import android.widget.Toast;
import android.support.v4.app.NavUtils;

public class SpinnerActivity extends Activity implements OnItemSelectedListener
{

Spinner spn;
ImageView iv;
Integer[] ids = { R.drawable.image1,R.drawable.image2,R.drawable.image3,R.drawable.image4,R.drawable.image5};


    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_spinner);
        spn = (Spinner)findViewById(R.id.spinner1);
        iv = (ImageView)findViewById(R.id.imgview1);
        spn.setOnItemSelectedListener(this);
     
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_spinner, menu);
        return true;
    }

@Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
long arg3)
{
iv.setImageResource(ids[arg2]);
}

@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub

}
}

---

Android Application for List Activity.

Question -5

Create an application that will pass some number to the next screen and on the next screen that number of items should be display in the list.

---

Step 1: Create New Project in Eclipse.

Step 2: Edit Main ListActivity xml file from res/layout folder of your project.

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginTop="71dp"
        android:text="Enter Any Number"
        android:textSize="30dp" />

    <EditText
        android:id="@+id/txtnum"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/textView1"
        android:layout_marginTop="20dp"
        android:ems="10"
        android:hint="Integer Only" />

    <Button
        android:id="@+id/btnenter"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_centerVertical="true"
        android:text="Submit" />

</RelativeLayout>

Step 3: Add New ListDisplay xml file to your res/layout folder of your project.

<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="No of Items Entered Are As Follows"
        android:textSize="20dp" />
     <ListView android:layout_height="wrap_content"
android:layout_width="match_parent" android:id="@+id/@android:id/list"
android:longClickable="true" android:fastScrollEnabled="false"></ListView>
</TableLayout>

Step 4: Edit Main List Activity Java file from src/package/ folder of your project.

package com.example.List;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.support.v4.app.NavUtils;

public class ListActivity extends Activity implements OnClickListener
{

Button submit;
EditText num;

    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_list);
        submit = (Button)findViewById(R.id.btnenter);
        num = (EditText)findViewById(R.id.txtnum);
        submit.setOnClickListener(this);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_list, menu);
        return true;
    }

@Override
public void onClick(View arg0)
{
String n = num.getText().toString();
Intent i = new Intent(this,ListDisplay.class);
i.putExtra("number",n);
startActivity(i);
}

 
}

Step 5: Add New ListDisplay Java class file to your src/package/ folder of your project.

package com.example.List;

import java.util.ArrayList;

import android.app.ListActivity;
import android.os.Bundle;
import android.widget.ArrayAdapter;

public class ListDisplay  extends ListActivity
{
 
ArrayList<String> arr=new ArrayList<String>();
ArrayAdapter<String> a;  
int i=0;
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_disp);
        a = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1 ,arr);
        setListAdapter(a);
        for(i=1; i<= Integer.parseInt(getIntent().getStringExtra("number")); i++)
        {
        arr.add("Item : "+i);
        }
        //Toast.makeText(this, "Welcome", Toast.LENGTH_LONG).show();
    }
}

---

Android Application On successful login open browser with any URL.

Question -4

Create an Login application as above . On successful login , open browser with any URL.

---

Step 1: Create New Project in Eclipse.

Step 2: Edit Main_Activity layout xml file from res/layout folder in your project

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="15dp"
        android:text="@string/loginform"
        android:textSize="40dp" />

    <TextView
        android:id="@+id/textView3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/textView1"
        android:layout_marginTop="41dp"
        android:text="@string/username" />

    <EditText
        android:id="@+id/uname"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/textView3"
        android:layout_alignBottom="@+id/textView3"
        android:layout_alignParentRight="true"
        android:layout_marginRight="14dp"
        android:ems="10"
        android:hint="@string/enter_username" >
     
        <requestFocus />
 
        </EditText>
    <EditText
        android:id="@+id/password"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/uname"
        android:layout_alignRight="@+id/uname"
        android:layout_below="@+id/uname"
        android:layout_marginTop="17dp"
        android:ems="10"
        android:hint="@string/enter_password"
        android:inputType="textPassword" >

     
    </EditText>

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/password"
        android:layout_alignBottom="@+id/password"
        android:layout_alignParentLeft="true"
        android:text="@string/password" />

    <Button
        android:id="@+id/btnlogin"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:enabled="false"
        android:text="@string/login" />

</RelativeLayout>

Step 3: Edit MainActivity.java file from src/package/ folder in your project

package com.example.loginuri;

import android.net.Uri;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.support.v4.app.NavUtils;
import android.text.Editable;
import android.text.TextWatcher;

a public class MainActivity extends Activity implements OnClickListener,TextWatcher
{

Button login;
EditText uname;
EditText pwd;

    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        login = (Button)findViewById(R.id.btnlogin);
        uname = (EditText)findViewById(R.id.uname);
        pwd = (EditText)findViewById(R.id.password);
     
        login.setOnClickListener(this);
        uname.addTextChangedListener(this);
        pwd.addTextChangedListener(this);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }

@Override
public void afterTextChanged(Editable arg0)
{
if(uname.getText().toString().equalsIgnoreCase("sahin") && pwd.getText().toString().equalsIgnoreCase("raj"))
{
login.setEnabled(true);
}

}

@Override
public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
int arg3) {
// TODO Auto-generated method stub

}

@Override
public void onTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {
// TODO Auto-generated method stub

}

@Override
public void onClick(View arg0)
{
Intent i = new Intent("android.intent.action.VIEW",Uri.parse("http://licamca.blogspot.com"));
startActivity(i);
}

 
}

---

Create login application where you will have to validate EmailID(UserName). Till the username and password is not validated, login button should remain disabled.

Question -3

Create login application where you will have to validate EmailID(UserName). Till the username and password is not validated, login button should remain disable.

---

Step 1: Create New Project in Eclipse.
Step 2: Edit Main Layout XML file from res/layout folder

<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:stretchColumns="1" >
 
    <TableRow
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:textSize="30dp"
        android:text="@string/username" />
</TableRow>

<TableRow
   android:layout_width="match_parent"
   android:layout_height="wrap_content" >

    <EditText
        android:id="@+id/uid"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="@string/username" />
</TableRow>

<TableRow
    android:layout_width="match_parent"
    android:layout_height="wrap_content" >

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="30dp"
        android:text="@string/password" />
</TableRow>

<TableRow
    android:layout_width="match_parent"
    android:layout_height="wrap_content" >

    <EditText
        android:id="@+id/pwd"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="@string/password" />
</TableRow>
<TableRow>
    <Button android:text="@string/login" android:id="@+id/btnlogin"  android:enabled="false"/>
</TableRow>
</TableLayout>

Step 3: Edit MainActivity.java file from scr/package/ folder

package com.example.login;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import android.support.v4.app.NavUtils;
import android.text.Editable;
import android.text.TextWatcher;

public class MainActivity extends Activity implements OnClickListener,TextWatcher
{

Button login;
EditText uname;
EditText pwd;

    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
     
        uname = (EditText)findViewById(R.id.uid);
        pwd = (EditText)findViewById(R.id.pwd);
        login = (Button)findViewById(R.id.btnlogin);      
     
        login.setOnClickListener(this);
        uname.addTextChangedListener(this);
        pwd.addTextChangedListener(this);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }

@Override
public void onClick(View v)
{
Toast.makeText(this,"Sucess",Toast.LENGTH_LONG).show();
}

@Override
public void afterTextChanged(Editable e)
{

if(uname.getText().toString().equalsIgnoreCase("sahin") && pwd.getText().toString().equalsIgnoreCase("raj"))
{
login.setEnabled(true);
}


}

@Override
public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
int arg3) {
// TODO Auto-generated method stub

}

@Override
public void onTextChanged(CharSequence arg0, int arg1, int arg2, int arg3)
{

}    
}

---

Android Application to understand Activity - Intent

Question -2

To understand Activity, Intent
a. Create sample application with login module.(Check username and password)
b. On successful login, go to next screen. And on failing login, alert user using Toast.
c. Also pass username to next screen

---

Step 1: Create New Project in eclipse 
Step 2: Edit main activity layout xml file.

<?xml version="1.0" encoding="utf-8"?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:stretchColumns="1"
     >
 <TableRow
        android:id="@+id/tableRow0"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" >
<TextView android:text="Login Form" android:textSize="30dp"/>
    </TableRow>
    <TableRow
        android:id="@+id/tableRow1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" >
<TextView android:text="UserName : " android:textSize="20dp"/>
<EditText android:id="@+id/etUname"/>
    </TableRow>
<TableRow
        android:id="@+id/tableRow2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" >
<TextView android:text="PassWord : " android:textSize="20dp"/>
<EditText android:id="@+id/etPwd"/>
    </TableRow>
    <Button
        android:id="@+id/btnLogin"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Login" />
</TableLayout>

Step 3: Add new layout xml file sucess.xml in res/layout folder.

<?xml version="1.0" encoding="utf-8"?>

<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent" >

    <TableRow

        android:id="@+id/tableRow1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content" >

        <TextView android:text="Login Sucessfull" android:textSize="30dp"/>

    </TableRow>

    <TableRow

        android:id="@+id/tableRow2"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content" >

        <TextView android:text="WellCome :" android:textSize="25dp"/>

        <TextView android:text="" android:id="@+id/tvUser" android:textSize="25dp"/>

    </TableRow>

</TableLayout>

Step 4: Edit Main Activity Java File from src/package/MainActivity.java

package myLab.Pack;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener{
    /** Called when the activity is first created. */
EditText uname;
EditText pwd;
Button login;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
     
        uname = (EditText)findViewById(R.id.etUname);
        pwd = (EditText)findViewById(R.id.etPwd);
        login = (Button)findViewById(R.id.btnLogin);
 
        login.setOnClickListener(this);
    }
    public void onClick(View v)
{
String un = uname.getText().toString();
String pd = pwd.getText().toString();
try
{
if(un.equalsIgnoreCase("sahin") && pd.equalsIgnoreCase("raj"))
{
Intent i = new Intent(this,Sucess.class);
i.putExtra("user", un);
startActivity(i);
}
else
{
Toast.makeText(this,"Usernae & Passward Mismatch",Toast.LENGTH_LONG).show();
}

}
catch(Exception e)
{
e.printStackTrace();
}

}

     
    }
   

Step 5: Add new Java file in src/package/sucess.java

package myLab.Pack;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;

public class Sucess extends Activity
{

TextView tv;
@Override
protected void onCreate(Bundle s)
{
// TODO Auto-generated method stub
super.onCreate(s);
setContentView(R.layout.sucess);
Intent i = getIntent();
String uname = i.getStringExtra("user");
tv = (TextView)findViewById(R.id.tvUser);
tv.setText(""+uname);

}

}

---

Android Hello World Application

Question -1

Create Hello World Application that will display  "Hello World" in the middle of the  screen in the  red color and white background.

---

Step 1: Create New Project in eclipse and go to res/layout folder.
Step 2: Edit MainActivity XML file.

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/White" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:padding="@dimen/padding_medium"
        android:text="@string/hello_world"
        android:textColor="@color/Red"
        tools:context=".MainActivity"
      />

</RelativeLayout>

---

Filter

Download Source Code
<!-- Create a servlet filter that logs all access to and from servlets in an application and
prints the following to System.out: or in your terminal or konsole
a. the time
d. the URL of the resource requested
e. the IP address of the visitor-->
<!-- display_Filter.java Filter Class-->
package FilterDisplay;
import java.io.*;
import javax.servlet.*;
import java.util.*;
import javax.servlet.http.*;
public class display_Filter implements Filter
{
    public void doFilter(ServletRequest request,ServletResponse response,FilterChain fc)throws ServletException,IOException
    {
        HttpServletRequest req=(HttpServletRequest)request;
        System.out.println("Requesting URL:-"+req.getRequestURL());
        System.out.println("Host or Ip address:-"+req.getRemoteHost());
        System.out.println("Date Of Accessing Request And Response Time:- "+new Date());
        fc.doFilter(request,response);
    }
    public void init(FilterConfig config){}
    public void destroy(){}
}
<!-- filter is implemented in this Servlet  Simple.java-->
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
public class Simple extends HttpServlet
{
    public void doGet(HttpServletRequest requeset,HttpServletResponse response)throws ServletException,IOException
    {
        response.setContentType("text/html");       
        PrintWriter out=response.getWriter();
        out.println("<html><head><title>fileter Example</title></head><body>");
        out.println("Hello See Your Terminal Please :) ");
        out.println("</body></html>");
        out.close();
    }
}
<!--web.xml file -->
<web-app>
    <servlet>
        <servlet-name>Display</servlet-name>
        <servlet-class>Simple</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>Display</servlet-name>
        <url-pattern>/Maulin_Filter</url-pattern>
    </servlet-mapping>
    <filter>
        <filter-name>Display_Filter</filter-name>
        <filter-class>FilterDisplay.display_Filter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>Display_Filter</filter-name>
        <servlet-name>Display</servlet-name>
    </filter-mapping>
</web-app>

generate page not found error

Download Code
<!--Write a servlet that returns a “page not found” error page (404) unless the user supplies a favouriteLanguage request (form) parameter with a value of “Java.” -->

<!-- Check.java -->
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
public class Check extends HttpServlet
{
    public void doGet(HttpServletRequest request,HttpServletResponse response)throws ServletException,IOException
    {
        response.setContentType("text/html");
        PrintWriter out=response.getWriter();
        String language=request.getParameter("language");
        language=language.toLowerCase();
        if(language.equals("java"))   
        {
            out.println("<html><head><title>Error Page :)</title></head><body>");
            out.println("<h1>Welcome dude nice Choice</h1></body></html>");
        }
        else
        {
            response.sendError(HttpServletResponse.SC_NOT_FOUND);       
        }
        out.close();
    }
}

<!-- favlanguage.html -->
<html>
<head>
    <title>Favourate Language</title>
</head>
    <body>
        <form name=f1 method="get" action="/NotFoundError/error_page">
            Enter Your favourate Language:-<input type="text" name="language" /><br>
            <input type="submit" name="submit" value="Submit" />
        </form>
    </body>
</html>

Jstl "" error Handling :)

You can Download Code from below link
http://www.4shared.com/zip/-krrH0XX/jstlTest.html
<!----- copy the two jar file (jstl.jar,standard.jar)in your webapplication lib directory .you will find this two jar file in /home/maulin/apache-tomcat-7.0.25/webapps/examples/WEB-INF/lib or in wondow$ you will find in webapps\examples\WEB-INF\lib directory -->
<!--- My Directory Structure Show Below you can easily understand it-->

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
        <title>
                Test
        </title>

</head>
        <body>
                <c:catch var="Maulin">
                        <% int a=0/0; %>
                </c:catch>
                Exception Message:- ${Maulin.message}
        </body>
</html>

Write a Servlet which displays the appropriate PDF file to the client, by looking at a request parameter

---

Assume that we have got three pdf files for the MCA-1 Syllabus, MCA-2 Syllabus and MCA-3 Syllabus respectively, Now write a Servlet which displays the appropriate PDF file to the client, by looking at a request 

parameter for the year (1, 2 or 3).

Hint: Create a HTML pages which will have a textbox and 

button. The user will enter the values in the textbox – 

either 1,2,3. Pass the value to a servlet page which will 

read the parameter value and display the appropriate 

PDF file. If the option is invalid they just display the 

message invalid semester.

Note: You can use any method – GET or POST

---

Step 1: Create HTML Page which will have a textbox and button.
which can pass value to servlet page.

<html>

<head>

<title>Display PDF</title>

</head>

<body>

<form action="http://localhost:8080/DisplayPdf/ViewPdf" method="POST">

<table border="2" align="center" width="50%" height="20%">

<tr align="center">

<td>Select Semester : </td>

<td>

<select name="list_select">

<option value="1"> 1</option>

<option value="2"> 2</option>

<option value="3"> 3</option>

</select></td>

</tr>

<tr align="center">

<td colspan="2">

<input type="submit" />

</td>

</tr>

</table>

</form>

</body>

</html>

Step 2: Create ViewPdf.java servlet file which can interact with pdf files and display it.

package pack7;

import java.io.*;

import javax.servlet.*;

import javax.servlet.http.*;

public class ViewPdf extends HttpServlet

{

public void doPost(HttpServletRequest request,HttpServletResponse response)throws ServletException,IOException

{

response.setContentType("text/html");

PrintWriter out = response.getWriter();

String value = request.getParameter("list_select");

if(value.equals("1"))

{

response.sendRedirect("./pdf/1.pdf");

}

else if(value.equals("2"))

{

response.sendRedirect("./pdf/2.pdf");

}

else if(value.equals("3"))

{

response.sendRedirect("./pdf/3.pdf");

}

else

{

out.println("Wrong Choice...!! ")

}

}

}

Step 3: Create WEB.XML file for Mapping Servlet file.

<?xml version="1.0" encoding="ISO-8859-1"?>

<web-app>

<servlet>

      <servlet-name>Display-PDF</servlet-name>

      <servlet-class>pack7.ViewPdf</servlet-class>

</servlet>    

<servlet-mapping>

        <servlet-name>Display-PDF</servlet-name>

        <url-pattern>/ViewPdf</url-pattern>

</servlet-mapping>  

</web-app>

---

Database Visit Counter

---

Database Visit Counter

Write a Servlet which displays a message and also displays how many times the message has been displayed (how many times the page has been visited). 
  
Hint: Create a file which will update the counter each and every time the page is being loaded. 


(Using Database Connection)

---

Step 1: Create a database with name database.mdb , Table name dbCounter , Column name counter with type numeric and add dsn with name db_count.

Step 2: Create VisitCounter.java servlet file which can interact with database for fetching and update counter value. 

package pack6;

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;

public class VisitCounter extends HttpServlet
{
public void doGet(HttpServletRequest request,HttpServletResponse response)throws ServletException,IOException
{
response.setContentType("text/html");
PrintWriter out = response.getWriter();
Connection conn = null;
                Statement stmt= null;
Statement update=null;
ResultSet rs = null;

try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
conn = DriverManager.getConnection("jdbc:odbc:db_count");
stmt = conn.createStatement();
rs = stmt.executeQuery("select * from dbCounter");

if(rs.next())
{
int count = Integer.parseInt(rs.getString(1));
out.println("counter : " +count);
count ++ ;

update = conn.createStatement();
String str = "UPDATE dbCounter SET Counter ="+count;
update.executeUpdate(str);
}
else
{
out.println("Data Not Loaded");
}
rs.close();
stmt.close();
update.close();
conn.close();
}
catch(ClassNotFoundException cnfex)
{
out.println("cnfex : " +cnfex.getMessage());
}
catch(SQLException sqlex)
{
out.println("cnfex : " +sqlex.getMessage());
}
}
}

Step 3: Create WEB.XML file for Mapping Servlet file.

<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app>
<servlet>
      <servlet-name>DatabaseVisitCounter</servlet-name>
      <servlet-class>pack6.VisitCounter</servlet-class>
</servlet>  
<servlet-mapping>
        <servlet-name>DatabaseVisitCounter</servlet-name>
        <url-pattern>/Visit</url-pattern>
</servlet-mapping>
</web-app>

---

Cookies Visit Counter

---

Cookies Visit Counter

Write a Servlet which displays a message and also displays how many times the message has been displayed (how many times the page has been visited). 
  
Hint: Create a file which will update the counter each and every time the page is being loaded. 

(Making use of cookies)

---

Step 1: Create VisitPage.Java using Packages Concepts for servlet which can handle counter variable to keep a track on visits.

package pack5;

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class VisitPage extends HttpServlet
{
public void doGet(HttpServletRequest request,HttpServletResponse response)throws ServletException,IOException
{
response.setContentType("text/html");
PrintWriter out = response.getWriter();
String cookieName = "Visit";
Cookie[] cookies = request.getCookies();
if(cookies == null)
{
out.println("Wellcome New User<br>");
Cookie c = new Cookie("Visit","0");
c.setMaxAge(60*60*24*365);
response.addCookie(c);
}
if(cookies != null)
{
for(int i=0;i<cookies.length;i++)
{
Cookie c = cookies[i];
if(cookieName.equals(c.getName()))
{
out.println("Wellcome Back Again..!!<br>");
int count = Integer.parseInt(c.getValue());
out.println("Count :" + ++count);
Cookie repeat = new Cookie("Visit",String.valueOf(count));
repeat.setMaxAge(60*60*24*365);
response.addCookie(repeat);
}
}
}
}
}

Step 2: Create WEB.XML file for Mapping Servlet file.

<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app>
<servlet>
      <servlet-name>CookiesVisitCounter</servlet-name>
      <servlet-class>pack5.VisitPage</servlet-class>
</servlet>  
<servlet-mapping>
        <servlet-name>CookiesVisitCounter</servlet-name>
        <url-pattern>/VisitPage</url-pattern>
</servlet-mapping>
</web-app>

---

Write a Servlet which displays a message and also displays how many times the message has been displayed (how many times the page has been visited).

---

Write a Servlet which displays a message and also displays how many times the message has been displayed (how many times the page has been visited). 
  
Hint: Create a file which will update the counter each and every time the page is being loaded. 


(Simple Counter Variable is Used Without making use of session , cookies  or database)

---

Step 1: Create VisitCounter.Java using Packages Concepts for servlet which can handle counter variable to keep a track on visits.

package pack4;

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class VisitCounter extends HttpServlet
{
private int Count = 0;
public void doGet(HttpServletRequest request,HttpServletResponse response)throws ServletException,IOException
{
response.setContentType("text/html");
PrintWriter out = response.getWriter(); if(Count > 0)
{
out.println("Wellcome Again ...!");
out.println("<br>Page Visited : " + ++Count+ " Times");
}
else if(Count <= 0)
{
out.println("Wellcome..!!");
out.println("<br>Page Visited : " + ++Count+ " Times");

}
}
}

Step 2: Create WEB.XML file for Mapping Servlet file.

<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app>
<servlet>
      <servlet-name>SimpleVisitCounter</servlet-name>
      <servlet-class>pack4.VisitCounter</servlet-class>
</servlet>  
<servlet-mapping>
        <servlet-name>SimpleVisitCounter</servlet-name>
        <url-pattern>/Visit</url-pattern>
</servlet-mapping>
</web-app>

---

Write a Servlet to display all the attributes available from headers

---

Write a Servlet to display all the attributes available from headers (request and context).
Hint: Make use of getHeader() to get all the related and display all the attributes available in the getHeader() function.
All the attribute:
• Accept
• Accept-Charset
• Accept-Encoding
• Accept-Language
• Authorization
• Connection
• Content-Length
• Host
• Referer
• User-Agent

---

Step 1: Create GetHeader.Java using Packages Concepts for servlet which can handle all header Attributes.

package pack3;

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class GetHeader extends HttpServlet
{
public void doGet(HttpServletRequest request,HttpServletResponse response)throws ServletException,IOException
{
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<html><head><title>Header Info Methods</title></head>");
out.println("<body><table align='center' border='2' width='50%' height='50%'>");
out.println("<tr align='center'><td colspan='2'>Header Attributes</td></tr>");
out.println("<tr align='center'><td>Accept :</td><td>"+request.getHeader("Accept")+"</td></tr>");

out.println("<tr align='center'><td>Accept-Charset :</td><td>"+request.getHeader("Accept-Charset")+"</td></tr>");
out.println("<tr align='center'><td>Accept-Encoding :</td><td>"+request.getHeader("Accept-Encoding")+"</td></tr>");
out.println("<tr align='center'><td>Accept-Language :</td><td>"+request.getHeader("Accept-Language")+"</td></tr>");
out.println("<tr align='center'><td>Authorization :</td><td>"+request.getHeader("Authorization")+"</td></tr>");
out.println("<tr align='center'><td>Connection :</td><td>"+request.getHeader("Connection")+"</td></tr>");
out.println("<tr align='center'><td>Content-Length :</td><td>"+request.getHeader("Content-Length")+"</td></tr>");
out.println("<tr align='center'><td>Host :</td><td>"+request.getHeader("Host")+"</td></tr>");
out.println("<tr align='center'><td>Referer :</td><td>"+request.getHeader("Referer")+"</td></tr>");
out.println("<tr align='center'><td>User-Agent :</td><td>"+request.getHeader("User-Agent")+"</td></tr>");
out.println("</table></body></html>");
}
}

Step 2: Create WEB.XML file for Mapping Servlet file.

<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app>
<servlet>
      <servlet-name>HeaderAttribute</servlet-name>
      <servlet-class>pack3.GetHeader</servlet-class>
</servlet>  
<servlet-mapping>
        <servlet-name>HeaderAttribute</servlet-name>
        <url-pattern>/GetHeader</url-pattern>
</servlet-mapping>
</web-app>

---