J2ME With Database Connection Program

Transcription

1 J2ME With Database Connection Program Midlet Code: /* * To change this template, choose Tools Templates * and open the template in the editor. package hello; import java.io.*; import java.util.*; import javax.microedition.midlet.*; // package required for J2ME import javax.microedition.lcdui.*; // package required for J2ME import javax.microedition.io.*; // package required for J2ME public class MySQLConnection extends MIDlet implements CommandListener { private String username; private String url = " private Display display; private Command exit = new Command("EXIT", Command.EXIT, 1);; private Command connect = new Command("Connect", Command.SCREEN, 1); private TextField tb; private Form menu; private TextField tb1;

2 private TextField tb2; DBConn db; public MySQLConnection() throws Exception { display = Display.getDisplay(this); public void startapp() { displaymenu(); public void displaymenu() { menu = new Form("Connect to Database"); tb = new TextField("Please enter database: ","",30,TextField.ANY ); tb1 = new TextField("Please enter username: ","",30,TextField.ANY); tb2 = new TextField("Please enter password: ","",30,TextField.PASSWORD); menu.append(tb); menu.append(tb1); menu.append(tb2); menu.addcommand(exit); menu.addcommand(connect); menu.setcommandlistener(this); display.setcurrent(menu); public void pauseapp() { public void destroyapp(boolean unconditional) { public void commandaction(command command, Displayable screen) { if (command == exit) {

3 destroyapp(false); notifydestroyed(); else if (command == connect) { db = new DBConn(this); db.start(); db.connectdb(tb.getstring(),tb1.getstring(),tb2.getstring()); public class DBConn implements Runnable { MySQLConnection midlet; private Display display; String db; String user; String pwd; public DBConn(MySQLConnection midlet) { this.midlet = midlet; display = Display.getDisplay(midlet); public void start() { Thread t = new Thread(this); t.start(); public void run() { StringBuffer sb = new StringBuffer(); try {

4 HttpConnection c = (HttpConnection) Connector.open(url); c.setrequestmethod(httpconnection.post); DataOutputStream os = (DataOutputStream)c.openDataOutputStream(); os.writeutf(db.trim()); os.writeutf(user.trim()); os.writeutf(pwd.trim()); os.flush(); os.close(); // Get the response back from the servlet page. DataInputStream is =(DataInputStream)c.openDataInputStream(); //is = c.openinputstream(); int ch; sb = new StringBuffer(); while ((ch = is.read())!= -1) { sb.append((char)ch); showalert(sb.tostring()); is.close(); c.close(); catch (Exception e) { showalert(e.getmessage()); /* This method will take input from user like db,user and pwd and will pass to the servlet

5 public void connectdb(string db,string user,string pwd) { this.db = db; this.user = user; this.pwd = pwd; /* Display Error On screen private void showalert(string err) { Alert a = new Alert(""); a.setstring(err); a.settimeout(alert.forever); display.setcurrent(a); ; Servlet Code: import java.io.datainputstream; import java.io.ioexception; import java.io.inputstream; import java.io.printwriter; import java.sql.connection; import java.sql.drivermanager; import java.sql.statement; import javax.servlet.servletexception;

6 import javax.servlet.annotation.webservlet; import javax.servlet.http.httpservlet; import javax.servlet.http.httpservletrequest; import javax.servlet.http.httpservletresponse; /** * = "getconn", urlpatterns = {"/getconn") public class getconn extends HttpServlet { /** * Processes requests for both HTTP * <code>get</code> and * <code>post</code> methods. * request servlet request response servlet response ServletException if a servlet-specific error occurs IOException if an I/O error occurs protected void processrequest(httpservletrequest request, HttpServletResponse response) throws ServletException, IOException { response.setcontenttype("text/html;charset=utf-8");

7 PrintWriter out = response.getwriter(); DataInputStream in = new DataInputStream((InputStream)request.getInputStream()); String db = in.readutf(); String user = in.readutf(); String pwd = in.readutf(); try{ Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); Connection conn = DriverManager.getConnection("jdbc:odbc:mydb"); Statement st=conn.createstatement(); st.executequery("insert into mobile values('"+db+"','"+user+"','"+pwd+"') "); catch(exception ec) { try { /* * TODO output your page here. You may use following sample code. out.println("<html>"); out.println("<head>"); out.println("<title>servlet getconn</title>"); out.println("</head>"); out.println("<body>"); out.println("<h1>servlet getconn at " + request.getcontextpath() + "</h1>");

8 out.println("</body>"); out.println("</html>"); finally { out.close(); // <editor-fold defaultstate="collapsed" desc="httpservlet methods. Click on the + sign on the left to edit the code."> /** * Handles the HTTP * <code>get</code> method. * request servlet request response servlet response ServletException if a servlet-specific error occurs IOException if an I/O error protected void doget(httpservletrequest request, HttpServletResponse response) throws ServletException, IOException { processrequest(request, response); /** * Handles the HTTP

9 * <code>post</code> method. * request servlet request response servlet response ServletException if a servlet-specific error occurs IOException if an I/O error protected void dopost(httpservletrequest request, HttpServletResponse response) throws ServletException, IOException { processrequest(request, response); /** * Returns a short description of the servlet. * a String containing servlet public String getservletinfo() { return "Short description";

10 Output:

11