1 Pertemuan 11 Aplikasi Web dengan Servlet dan JSP Matakuliah: T0053/Web Programming Tahun: 2006 Versi: 2

2 Learning Outcomes Pada akhir pertemuan ini, diharapkan mahasiswa akan mampu : Menjelaskan Teknik membangun aplikasi web berbasis Servlet dan JSP yang terhubung ke database Membuat aplikasi web yang lebih komplek menggunakan Servlet dan JSP yang terkoneksi ke database Menggunakan session & cookie

3 Outline Materi Aplikasi web dengan Servlet dan JSP Aplikasi web menggunakan JDBC tingkat lanjut

4 Advanced Servlet

5 Codes Guest Book Form Guest Book Binus <FORM ACTION= /GuestBookServlet METHOD=POST> address: First Name: ….

6 Servlet import java.io.*;import javax.servlet.*;import javax.servlet.http.*; import java.util.*;import java.sql.*; public class GuestBookServlet extends HttpServlet { private Statement statement = null; private Connection connection = null; private String URL = "jdbc:odbc:Kopi"; public void init( ServletConfig config )throws ServletException { super.init( config ); try { Class.forName( "sun.jdbc.odbc.JdbcOdbcDriver" ); connection = DriverManager.getConnection( URL, "sa", "" ); } catch ( Exception e ) { e.printStackTrace();connection = null; }} public void doPost( HttpServletRequest req,HttpServletResponse res ) throws ServletException, IOException { String , firstName, lastName, company, ….

7 Servlet public void doPost( HttpServletRequest req,HttpServletResponse res ) throws ServletException, IOException { String , firstName, lastName, company, snailmailList, cppList, javaList, vbList, iwwwList; = req.getParameter( " " ); firstName = req.getParameter( "FirstName" ); lastName = req.getParameter( "LastName" ); company = req.getParameter( "Company" ); snailmailList = req.getParameter( "mail" ); cppList = req.getParameter( "c_cpp" ); javaList = req.getParameter( "java" ); vbList = req.getParameter( "vb" ); iwwwList = req.getParameter( "iwww" ); PrintWriter output = res.getWriter(); res.setContentType( "text/html" ); …..

8 Codes private boolean insertIntoDB( String stringtoinsert ) { try { statement = connection.createStatement(); statement.execute( "INSERT INTO GuestBook values (" + stringtoinsert + ");" ); statement.close(); } catch ( Exception e ) { System.err.println( "ERROR: bermasalah menambahkan data baru" ); e.printStackTrace(); return false; } return true; } public void destroy() { try { connection.close(); } catch( Exception e ) { System.err.println( "bermasalah menutup database" ); } }}

9 Sample Web

10 Display Data Daftar Programmer No nama Deskripsi Aksi <% Class.forName ("sun.jdbc.odbc.JdbcOdbcDriver"); Connection con = DriverManager.getConnection ("jdbc:odbc:kopi","sa",“password"); Statement stmt = con.createStatement (); ResultSet rst = stmt.executeQuery ("Select * from programmer");

11 Display Data while(rst.next()) //baca data { int no=rst.getInt("no"); String nama=rst.getString("nama"); String deskripsi=rst.getString("deskripsi"); out.print (" "+no+" "); out.print (" "+nama+" "); out.print (" "+deskripsi+" "); out.print (" Rubah Data"); out.print (" | Hapus Data "); out.println (" "); } stmt.close(); con.close();

12 Add Data

13 Add Data <% String nama=request.getParameter ("nama"); String ganti=request.getParameter ("TextGanti"); String sql="insert into programmer (nama,deskripsi) " + "values"('"+ nama + "','" + ganti+ "')"; Class.forName ("sun.jdbc.odbc.JdbcOdbcDriver"); Connection con = DriverManager.getConnection ("jdbc:odbc:kopi","sa","mautauaja"); Statement stmt = con.createStatement (); stmt.executeUpdate(sql); stmt.close(); con.close(); %>

14 Edit Data

15 Edit Data String kunci=request.getQueryString(); String sql= "Select * from programmer where programmer.no = " + kunci; Class.forName ("sun.jdbc.odbc.JdbcOdbcDriver"); Connection con = DriverManager.getConnection ("jdbc:odbc:Trisakti","sa",“password"); Statement stmt = con.createStatement (); ResultSet rs=stmt.executeQuery(sql); rs.next(); %> Silahkan Update data ");%>

16 Save Data <% String kunci=request.getParameter ("kunci"); String nama=request.getParameter("nama"); String ganti=request.getParameter ("TextGanti"); String sql ="update programmer set nama='" + nama + "', deskripsi='" + ganti+"' where no="+ kunci; Class.forName ("sun.jdbc.odbc.JdbcOdbcDriver"); Connection con = DriverManager.getConnection ("jdbc:odbc:Trisakti","",""); Statement stmt = con.createStatement (); stmt.executeUpdate(sql); stmt.close(); con.close(); %>

17 Session & Cookie When you are working with an application, you open it, do some changes and then you close it. This is much like a Session. The computer knows who you are. It knows when you start the application and when you end. But on the internet there is one problem: the web server does not know who you are and what you do because the HTTP address doesn't maintain state. Java solves this problem by creating a unique cookie for each user. The cookie is sent to the client and it contains information that identifies the user. This interface is called the Session object.

18 Cookie //buat session session.setAttribute("idk", idk); //baca session String idk=(String)session.getAttribute("idk"); Cookie[] cookies = request.getCookies(); for (int i = 0; i < cookies.length; i++) { Cookie c = cookies[i]; String name = c.getName(); String value = c.getValue(); out.println(name + " = " + value);

19 References Deithel, “Java How To Program”, 5 th ed, 2006 Widodo Budiharto, “Panduan Lengkap Pemrograman J2EE”, Andi Offset Yogyakarta,