loginscreenexample.java

手机登陆界面 包括针对手持设备和移动电话的应用程序

     * @return the initialized component instance
     */
    public WaitScreen getWaitScreen() {
        if (waitScreen == null) {//GEN-END:|13-getter|0|13-preInit
            // write pre-init user code here
            waitScreen = new WaitScreen(getDisplay());//GEN-BEGIN:|13-getter|1|13-postInit
            waitScreen.setTitle("waitScreen");
            waitScreen.setCommandListener(this);
            waitScreen.setText("Please Wait ...");
            waitScreen.setTask(getTask());//GEN-END:|13-getter|1|13-postInit
            // write post-init user code here
        }//GEN-BEGIN:|13-getter|2|
        return waitScreen;
    }
    //</editor-fold>//GEN-END:|13-getter|2|

    //<editor-fold defaultstate="collapsed" desc=" Generated Getter: splashScreen ">//GEN-BEGIN:|25-getter|0|25-preInit
    /**
     * Returns an initiliazed instance of splashScreen component.
     * @return the initialized component instance
     */
    public SplashScreen getSplashScreen() {
        if (splashScreen == null) {//GEN-END:|25-getter|0|25-preInit
            // write pre-init user code here
            splashScreen = new SplashScreen(getDisplay());//GEN-BEGIN:|25-getter|1|25-postInit
            splashScreen.setTitle("splashScreen");
            splashScreen.setCommandListener(this);
            splashScreen.setText(" Login Screen Example");//GEN-END:|25-getter|1|25-postInit
            // write post-init user code here
        }//GEN-BEGIN:|25-getter|2|
        return splashScreen;
    }
    //</editor-fold>//GEN-END:|25-getter|2|

    //<editor-fold defaultstate="collapsed" desc=" Generated Getter: exitCommand ">//GEN-BEGIN:|33-getter|0|33-preInit
    /**
     * Returns an initiliazed instance of exitCommand component.
     * @return the initialized component instance
     */
    public Command getExitCommand() {
        if (exitCommand == null) {//GEN-END:|33-getter|0|33-preInit
            // write pre-init user code here
            exitCommand = new Command("Exit", Command.EXIT, 0);//GEN-LINE:|33-getter|1|33-postInit
            // write post-init user code here
        }//GEN-BEGIN:|33-getter|2|
        return exitCommand;
    }
    //</editor-fold>//GEN-END:|33-getter|2|

    //<editor-fold defaultstate="collapsed" desc=" Generated Getter: loginScreen ">//GEN-BEGIN:|29-getter|0|29-preInit
    /**
     * Returns an initiliazed instance of loginScreen component.
     * @return the initialized component instance
     */
    public LoginScreen getLoginScreen() {
        if (loginScreen == null) {//GEN-END:|29-getter|0|29-preInit
            // write pre-init user code here
            loginScreen = new LoginScreen(getDisplay());//GEN-BEGIN:|29-getter|1|29-postInit
            loginScreen.setLabelTexts("Username:", "Password:");
            loginScreen.setTitle("loginScreen");
            loginScreen.addCommand(LoginScreen.LOGIN_COMMAND);
            loginScreen.addCommand(getExitCommand());
            loginScreen.setCommandListener(this);
            loginScreen.setBGColor(-3355444);
            loginScreen.setFGColor(0);
            loginScreen.setUseLoginButton(false);//GEN-END:|29-getter|1|29-postInit
            // write post-init user code here
        }//GEN-BEGIN:|29-getter|2|
        return loginScreen;
    }
    //</editor-fold>//GEN-END:|29-getter|2|

    //<editor-fold defaultstate="collapsed" desc=" Generated Getter: alertFailure ">//GEN-BEGIN:|37-getter|0|37-preInit
    /**
     * Returns an initiliazed instance of alertFailure component.
     * @return the initialized component instance
     */
    public Alert getAlertFailure() {
        if (alertFailure == null) {//GEN-END:|37-getter|0|37-preInit
            // write pre-init user code here
            alertFailure = new Alert("alert", "Error", null, null);//GEN-BEGIN:|37-getter|1|37-postInit
            alertFailure.setTimeout(Alert.FOREVER);//GEN-END:|37-getter|1|37-postInit
            // write post-init user code here
        }//GEN-BEGIN:|37-getter|2|
        return alertFailure;
    }
    //</editor-fold>//GEN-END:|37-getter|2|

    //<editor-fold defaultstate="collapsed" desc=" Generated Getter: alertSuccess ">//GEN-BEGIN:|39-getter|0|39-preInit
    /**
     * Returns an initiliazed instance of alertSuccess component.
     * @return the initialized component instance
     */
    public Alert getAlertSuccess() {
        if (alertSuccess == null) {//GEN-END:|39-getter|0|39-preInit
            // write pre-init user code here
            alertSuccess = new Alert("alert1");//GEN-BEGIN:|39-getter|1|39-postInit
            alertSuccess.setTimeout(Alert.FOREVER);//GEN-END:|39-getter|1|39-postInit
            // write post-init user code here
        }//GEN-BEGIN:|39-getter|2|
        return alertSuccess;
    }
    //</editor-fold>//GEN-END:|39-getter|2|

    /**
     * Returns a display instance.
     * @return the display instance.
     */
    public Display getDisplay() {
        return Display.getDisplay(this);
    }

    /**
     * Exits MIDlet.
     */
    public void exitMIDlet() {
        switchDisplayable(null, null);
        destroyApp(true);
        notifyDestroyed();
    }

    /**
     * Called when MIDlet is started.
     * Checks whether the MIDlet have been already started and initialize/starts or resumes the MIDlet.
     */
    public void startApp() {
        if (midletPaused) {
            resumeMIDlet();
        } else {
            initialize();
            startMIDlet();
        }
        midletPaused = false;
    }

    /**
     * Called when MIDlet is paused.
     */
    public void pauseApp() {
        midletPaused = true;
    }

    /**
     * Called to signal the MIDlet to terminate.
     * @param unconditional if true, then the MIDlet has to be unconditionally terminated and all resources has to be released.
     */
    public void destroyApp(boolean unconditional) {
    }

    private void login() throws IOException {
        //URL
        String url = "http://localhost:8080/LoginScreenExample/" + "?username=" + getLoginScreen().getUsername() + "&password=" + getLoginScreen().getPassword();
        //Clean up alertSuccess
        getAlertSuccess().setString("");
        //Connect to the server
        HttpConnection hc = (HttpConnection) Connector.open(url);
        //Authentication
        if (hc.getResponseCode() == HttpConnection.HTTP_OK) {
            login = true;
        }
        //Closing time...
        hc.close();
        //Take action based on login value
        if (login) {
            getAlertSuccess().setString("Login Succesfull");
        } else {
            getAlertSuccess().setString("Wrong Username or Password");
        }
        login = false;
    }
}