Sub: Advance Java Programming Laboratory

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1 1. Write a JAVA Servlet program to implement a dynamic HTML, using the servlet. (user name and password should be accepted using HTML and displayed using a Servlet) /**************** HTML CODE ******************/ //Pro_1.html <!DOCTYPE html>  <html> <body bgcolor=aabbcc> <form action=pro_1 method="post"> NAME:<input type="text" name="name"><br> PASSWORD:<input type="password" name="pwd"><br> <input type="submit"> <input type="reset"> </form> </body> </html> /**************** Servlet Program Code ******************/ // Pro_1.java import javax.servlet.*; import java.io.*; public class Pro_1 extends GenericServlet public void service(servletrequest req, ServletResponse res) try PrintWriter pw=res.getwriter(); res.setcontenttype("text/html"); String name=req.getparameter("name"); String pwd=req.getparameter("pwd"); pw.println("<html><b>name:"+name+"<br>password:"+pwd+"</html>"); pw.close(); catch(exception excep) System.out.println(excep.getMessage()); Dept of MCA. KLEIT Hubli Page 1

$Note: add Tomacats common- lib- servlet-api into Jcreator Note: Save the above servlet in the C:\Program Files\Apache Software Foundation\Tomcat 5.$

2 Note: add Tomacats common- lib- servlet-api into Jcreator Note: Save the above servlet in the C:\Program Files\Apache Software Foundation\Tomcat 5.5\webapps\servlets-examples\WEB- INF\classes\Program1.java Save the file name as 8prog.html in C:\Program Files\Apache Software Foundation\Tomcat 5.5\webapps\servlets-examples\2prog.html OUTPUT Open Internet Explorer and type the following URL Dept of MCA. KLEIT Hubli Page 2

3 Dept of MCA. KLEIT Hubli Page 3

4 2. Write a JAVA Servlet Program to Auto Web Page Refresh (Consider a webpage which is displaying Date and time or stock market status. For all such type of pages, you would need to refresh your web page regularly; Java Servlet makes this job easy by providing refresh automatically after a given interval). // Import required java libraries import java.io.*; import javax.servlet.*; import javax.servlet.http.*; import java.util.*; // Extend HttpServlet class public class LabProgram2 extends HttpServlet // Method to handle GET method request. public void doget(httpservletrequest request, HttpServletResponse response) throws ServletException,IOException // Set refresh, autoload time as 5 seconds response.setintheader("refresh",5); // Set response content type response.setcontenttype("text/html"); // Get current time Calendar calendar =new GregorianCalendar(); String am_pm; int hour = calendar.get(calendar.hour); int minute = calendar.get(calendar.minute); int second = calendar.get(calendar.second); if(calendar.get(calendar.am_pm)==0) am_pm ="AM"; else am_pm ="PM"; String CT = hour+":"+ minute +":"+ second +" "+ am_pm; PrintWriter out= response.getwriter(); String title ="Auto Page Refresh using Servlet"; String doctype = "<!doctype html public \"-//w3c//dtd html 4.0 "+ "transitional//en\">\n"; out.println(doctype + "<html>\n"+ "<head><title>"+ title +"</title></head>\n"+ "<body bgcolor=\"#f0f0f0\">\n"+ "<h1 align=\"center\">"+ title +"</h1>\n"+ Dept of MCA. KLEIT Hubli Page 4

5 "<p>current Time is: "+ CT +"</p>\n"); // Method to handle POST method request. public void dopost(httpservletrequest request,httpservletresponse response) throws ServletException,IOException doget(request, response); Out Put : Dept of MCA. KLEIT Hubli Page 5

6 3. Write a JAVA Servlet Program to implement and demonstrate get() and Post methods(using HTTP Servlet Class). index.html <html> <body> <form action="helloform" method="get"> First Name: <input type="text" name="first_name"> <br/> Last Name: <input type="text" name="last_name"/> <input type="submit" value="submit"/> </form> </body> </html> HelloForm.java // Import required java libraries import java.io.*; import javax.servlet.*; import javax.servlet.http.*; // Extend HttpServlet class public class HelloForm extends HttpServlet public void doget(httpservletrequest request, HttpServletResponse response) throws ServletException,IOException // Set response content type response.setcontenttype("text/html"); PrintWriter out= response.getwriter(); String title ="Using GET Method to Read Form Data"; String doctype = "<!doctype html public \"-//w3c//dtd html 4.0 "+ "transitional//en\">\n"; out.println(doctype + "<html>\n"+ "<head><title>"+ title +"</title></head>\n"+ "<body bgcolor=\"#f0f0f0\">\n"+ "<h1 align=\"center\">"+ title +"</h1>\n"+ "<ul>\n"+ " <li><b>first Name</b>: " + request.getparameter("first_name")+"\n"+ " <li><b>last Name</b>: " + request.getparameter("last_name")+"\n"+ "</ul>\n"+ "</body></html>"); Dept of MCA. KLEIT Hubli Page 6

7 index2.html <html> <body> <form action="helloform2" method="post"> First Name: <input type="text" name="first_name"> <br/> Last Name: <input type="text" name="last_name"/> <input type="submit" value="submit"/> </form> </body> </html> HelloForm2.java // Import required java libraries import java.io.*; import javax.servlet.*; import javax.servlet.http.*; // Extend HttpServlet class public class HelloForm2 extends HttpServlet // Method to handle GET method request. public void doget(httpservletrequest request, HttpServletResponse response) throws ServletException,IOException // Set response content type response.setcontenttype("text/html"); PrintWriter out= response.getwriter(); String title ="Using Post Method to Read Form Data"; String doctype = "<!doctype html public \"-//w3c//dtd html 4.0 "+ "transitional//en\">\n"; out.println(doctype + "<html>\n"+ "<head><title>"+ title +"</title></head>\n"+ "<body bgcolor=\"#f0f0f0\">\n"+ "<h1 align=\"center\">"+ title +"</h1>\n"+ "<ul>\n"+ " <li><b>first Name</b>: " + request.getparameter("first_name")+"\n"+ " <li><b>last Name</b>: " + request.getparameter("last_name")+"\n"+ "</ul>\n"+ "</body></html>"); // Method to handle POST method request. public void dopost(httpservletrequest request, HttpServletResponse response) throws ServletException,IOException Dept of MCA. KLEIT Hubli Page 7

8 doget(request, response); Out Put: Using GET Method Dept of MCA. KLEIT Hubli Page 8

9 Dept of MCA. KLEIT Hubli Page 9

10 Using POST Method Dept of MCA. KLEIT Hubli Page 10

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12 4. Write a JAVA Servlet Program using cookies to remember user preferences. ///************** First Program for storing Cookies ***************/// CookieUtilities.java import javax.servlet.http.*; /** Two static methods for use in cookie handling. */ public class CookieUtilities public static String getcookievalue(httpservletrequest request, String cookiename, String defaultvalue) Cookie[] cookies = request.getcookies(); if (cookies!= null) for (Cookie cookie : cookies) if (cookiename.equals(cookie.getname())) return(cookie.getvalue()); return(defaultvalue); public static Cookie getcookie(httpservletrequest request, String cookiename) Cookie[] cookies = request.getcookies(); if (cookies!= null) for (Cookie cookie : cookies) if (cookiename.equals(cookie.getname())) return(cookie); return(null); ///*************Second Program for Long Lived Cookie Initialization *****************/// LongLivedCookie.java import javax.servlet.http.*; Dept of MCA. KLEIT Hubli Page 12

13 /** Cookie that persists 1 year. Default Cookie doesn't * persist past current browsing session. */ public class LongLivedCookie extends Cookie public static final int SECONDS_PER_YEAR = 60*60*24*365; public LongLivedCookie(String name, String value) super(name, value); setmaxage(seconds_per_year); ///*************Third Program Registration Form ***********************/// RegistrationForm.java import javax.servlet.http.*; /** Cookie that persists 1 year. Default Cookie doesn't * persist past current browsing session. */ public class LongLivedCookie extends Cookie public static final int SECONDS_PER_YEAR = 60*60*24*365; public LongLivedCookie(String name, String value) super(name, value); setmaxage(seconds_per_year); ///********************** Registration Servlets ********************/// RegistrationServlet.java import java.io.*; import javax.servlet.*; import javax.servlet.http.*; /** Servlet that processes a registration form containing * a user's first name, last name, and address. * If all the values are present, the servlet displays the * values. If any of the values are missing, the input * form is redisplayed. Either way, the values are put * into cookies so that the input form can use the * previous values. */ public class RegistrationServlet extends HttpServlet Dept of MCA. KLEIT Hubli Page 13

14 public void doget(httpservletrequest request,httpservletresponse response) throws ServletException, IOException response.setcontenttype("text/html"); boolean ismissingvalue = false; String firstname = request.getparameter("firstname"); if (ismissing(firstname)) firstname = "Missing first name"; ismissingvalue = true; String lastname = request.getparameter("lastname"); if (ismissing(lastname)) lastname = "Missing last name"; ismissingvalue = true; String address = request.getparameter(" address"); if (ismissing( address)) address = "Missing address"; ismissingvalue = true; Cookie c1 = new LongLivedCookie("firstName", firstname); response.addcookie(c1); Cookie c2 = new LongLivedCookie("lastName", lastname); response.addcookie(c2); Cookie c3 = new LongLivedCookie(" Address", Address); response.addcookie(c3); String formaddress = "/labprogram4/registrationform"; if (ismissingvalue) response.sendredirect(formaddress); else PrintWriter out = response.getwriter(); String doctype = "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 " + "Transitional//EN\">\n"; String title = "Thanks for Registering"; out.println (doctype + "<HTML>\n" + "<HEAD><TITLE>" + title + "</TITLE></HEAD>\n" + "<BODY BGCOLOR=\"#FDF5E6\">\n" + "<CENTER>\n" + "<H1 ALIGN>" + title + "</H1>\n" + "<UL>\n" + " <LI><B>First Name</B>: " + firstname + "\n" + Dept of MCA. KLEIT Hubli Page 14

15 " <LI><B>Last Name</B>: " + lastname + "\n" + " <LI><B> address</b>: " + address + "\n" + "</UL>\n" + "</CENTER></BODY></HTML>"); /** Determines if value is null or empty. */ private boolean ismissing(string param) return((param == null) (param.trim().equals(""))); OutPut: Dept of MCA. KLEIT Hubli Page 15

16 Intermediate Page if I miss any Values: Dept of MCA. KLEIT Hubli Page 16

17 Final Page : Dept of MCA. KLEIT Hubli Page 17

18 Close the Session And Reopen It opens the page with Last Session information As shown Below: Dept of MCA. KLEIT Hubli Page 18

19 Dept of MCA. KLEIT Hubli Page 19

20 5. a. Write a JAVA JSP Program to implement verification of a particular user login and display a Welcome page. b. Write a JSP program to demonstrate the import attribute. 5a.jsp <html> <head> </head> <body> <% String s=request.getparameter("uname"); String s1=request.getparameter("pwd"); int temp=integer.parseint(s1); if(s.equals("pnt")&& temp==564) %> <p style="font size:30pt;align:center"><b>welcome to Web Page!!!<%=s %><b> <% else %>invalid password or invalid username <% %></body></html> Note: Save the File in C:\Program Files\Apache Software Foundation\Tomcat 5.5\webapps\jspexamples\8b.jsp 5a.html <html> <head> <title>open page</title> <body> <form method="get" action="5a.jsp"> Username:<input type="text" name="uname"><br/> Password:<input type="password" name="pwd"><br/> <input type="submit" value="login"> <input type="reset" value="reset"> </form> </body> </html> Dept of MCA. KLEIT Hubli Page 20

21 Note: Save the File in C:\Program Files\Apache Software Foundation\Tomcat 5.5\webapps\jspexamples\8b.html Output Open Internet Explorer and type the following URL Dept of MCA. KLEIT Hubli Page 21

22 Dept of MCA. KLEIT Hubli Page 22

23 6. Write a JAVA JSP Program which uses jsp:include and jsp:forward action to display a Webpage. //jsp:include Following is the content of date.jsp file: <p> Today's date: <%= (new java.util.date()).tolocalestring()%> </p> Here is the content of main.jsp file: <html> <head> <title>the include Action Example</title> </head> <body> <center> <h2>the include action Example</h2> <jsp:include page="date.jsp" flush="true" /> </center> </body> </html> Now let us keep all these files in root directory and try to access main.jsp. This would display result something like this: //jsp:forward Let us reuse following two files (a) date.jps and (b) main.jsp as follows: Following is the content of date.jsp file: <p> Today's date: <%= (new java.util.date()).tolocalestring()%> </p> Here is the content of main.jsp file: <html> <head> <title>the include Action Example</title> </head> <body> <center> <h2>the include action Example</h2> <jsp:forward page="date.jsp" /> </center> </body> </html> Now let us keep all these files in root directory and try to access main.jsp. This would display result something like as below. Here it discarded content from main page and displayed content from forwarded page only. Today's date: 12-Sep :54:22 Dept of MCA. KLEIT Hubli Page 23

24 7. Write a JAVA JSP Program which uses <jsp:plugin> tag to run a applet. Plugin.jsp <html> <title>plugin example</title> <body bgcolor="white"> <jsp:plugin type="applet" code="test.class" codebase="applet" jreversion="1.2" width="160" height="150"> <jsp:fallback> Plugin tag OBJECT or EMBED not supported by browser </jsp:fallback> </jsp:plugin> <p> <h4> <font color=red> The above applet is nloaded using the java Plugin from a jsp using the plugin tag </font> </h4> </body> </html> Note: create a folder in jsp-examples/kish/plugin.jsp import java.applet.*; import java.awt.graphics; public class Test extends Applet public void init() public void paint(graphics g) g.drawstring("kleit",10,10); public void start() public void stop() public void run() Dept of MCA. KLEIT Hubli Page 24

$C:\Program Files\Apache Software Foundation\Tomcat 5.$

25 C:\Program Files\Apache Software Foundation\Tomcat 5.5\webapps\jspexamples\mca\plugin.jsp OUTPUT Dept of MCA. KLEIT Hubli Page 25

26 8. Write a JAVA JSP Program to get student information through a HTML and create a JAVA Bean class, populate Bean and display the same information through another JSP. package beans; import java.io.serializable; public class Student implements Serializable String name=""; String =""; int age=0; public Student() public void SetName(String str) name=str; public String getname() return name; public void set (string str) =str; public String get () return ; public void setage(int str) age=str; public int getage() return age; Note: Save the Student.java in Dept of MCA. KLEIT Hubli Page 26

27 C:\Program Files\Apache Software Foundation\Tomcat 5.5\webapps\servlets-examples\ Student.java <html> <head> </head> <body bgcolor="pink"> <h2> Student Details</h2> <hr/> language="java %> <jsp:usebean id="std" scope="session" class="beans.student"/> <% std.setname(request.getparameter("sname")); std.set (request.getparameter(" ")); std.setage(integer.parseint(request.getparameter("age"))); %> Student Name<%=std.getName()%> <br> <%=std.get ()%> <br> Age<%=std.getAge()%> </body> </html> Note: Save the File in C:\Program Files\Apache Software Foundation\Tomcat 5.5\webapps\jspexamples\Student.jsp <html> <body> <form action ="Student.jsp"> StudentName<input type="text" name="sname"><br> ID<input type="text" name=" "><br> Age<input type="text" name="age"> <input type="submit"> </form> </body> </html> Note: Save the File in C:\Program Files\Apache Software Foundation\Tomcat 5.5\webapps\jspexamples\Student.html Output Dept of MCA. KLEIT Hubli Page 27

28 Dept of MCA. KLEIT Hubli Page 28

29 9. Write a JAVA Program to insert data into Student DATA BASE and retrieve info based on particular queries(for example update, delete, search etc ). import java.sql.*; import java.io.*; public class JDBCExample static final String JDBC_DRIVER = "com.mysql.jdbc.driver"; static final String DB_URL = "jdbc:mysql://localhost/students"; static final String USER = "root"; static final String PASS = ""; public static void main(string[] args) BufferedReader br=new BufferedReader(new InputStreamReader(System.in)); Connection conn = null; Statement stmt = null; try Class.forName( com.mysql.jdbc.driver ); System.out.println("Connecting to a selected database..."); conn = DriverManager.getConnection(= "jdbc:mysql://localhost/students", root, ); System.out.println("Connected database successfully..."); System.out.println("Creating table in given database..."); stmt = conn.createstatement(); int ch; String sql; System.out.println("1. Create \n 2. Insert \n 3. Select \n 4. Drop \n 5. Exit"); System.out.println("Enter ur choice"); ch=integer.parseint(br.readline()); switch(ch) case 1: sql = "CREATE TABLE Temp" + "(id INTEGER not NULL, " + " first VARCHAR(255), " + Dept of MCA. KLEIT Hubli Page 29

30 break; case 2: " last VARCHAR(255), " + " age INTEGER, " + " PRIMARY KEY ( id ))"; stmt.executeupdate(sql); System.out.println("Created table in given database..."); System.out.println("Enter the id"); int id1= Integer.parseInt(br.readLine()); System.out.println("Enter the first name"); String fname=br.readline(); System.out.println("Enter the last name"); String lname=br.readline(); System.out.println("Enter the age"); String agee=br.readline(); sql = "insert into temp values ('"+id1+"','"+fname+"','"+lname+"','"+agee+"')"; break; case 3: stmt.executeupdate(sql); sql = "SELECT id, first, last, age FROM Temp"; ResultSet rs = stmt.executequery(sql); while(rs.next()) //Retrieve by column name int id = rs.getint("id"); int age = rs.getint("age"); String first = rs.getstring("first"); String last = rs.getstring("last"); //Display values System.out.print("ID: " + id); System.out.print(", Age: " + age); System.out.print(", First: " + first); System.out.println(", Last: " + last); rs.close(); break; case 4: sql="drop table Temp"; stmt.executeupdate(sql); System.out.println("Droppped table..."); Dept of MCA. KLEIT Hubli Page 30

31 break; catch(sqlexception se) //Handle errors for JDBC se.printstacktrace(); catch(exception e) //Handle errors for Class.forName e.printstacktrace(); finally //finally block used to close resources try if(stmt!=null) conn.close(); catch(sqlexception se) // do nothing try if(conn!=null) conn.close(); catch(sqlexception se) se.printstacktrace(); //end finally try //end try System.out.println("Goodbye!"); //end main //end JDBCExample Dept of MCA. KLEIT Hubli Page 31

32 OUTPUT:- Connecting to a selected database... Connected database successfully... Creating table in given database Create 2. Insert 3. Select 4. Drop 5. Exit Enter ur choice 3 ID: 100, Age: 20, First: vyas, Last: j ID: 101, Age: 25, First: bheem, Last: rao Goodbye! Press any key to continue... Dept of MCA. KLEIT Hubli Page 32

Handling Cookies. Agenda

Handling Cookies. Agenda Handling Cookies 1 Agenda Understanding the benefits and drawbacks of cookies Sending outgoing cookies Receiving incoming cookies Tracking repeat visitors Specifying cookie attributes Differentiating between