两种不同的实现mvc模式(2) 使用Observer实现

http://lindongxiao.iteye.com/admin/show/98810这里有另外一种实现,可以对比
view接口
java 代码

public interface View {
    public void refreshContactView(String firstName, String lastName);
}

java 代码

import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import mvcpattern1.EditController;

public class EditView extends JPanel implements View{

    private static final String UPDATE_BUTTON = "Update";

    private static final String EXIT_BUTTON = "Exit";

    private static final String CONTACT_FIRST_NAME = "First Name  ";

    private static final String CONTACT_LAST_NAME = "Last Name  ";

    private static final int FNAME_COL_WIDTH = 25;

    private static final int LNAME_COL_WIDTH = 40;

    private EditController controller;

    private JLabel firstNameLabel, lastNameLabel;

    private JTextField firstName, lastName;

    private JButton update, exit;

    public EditView(TextModel model) {
         controller = new EditController(model,this);
         createGui();
    }

    public void createGui() {
        update = new JButton(UPDATE_BUTTON);
        exit = new JButton(EXIT_BUTTON);

        firstNameLabel = new JLabel(CONTACT_FIRST_NAME);
        lastNameLabel = new JLabel(CONTACT_LAST_NAME);

        firstName = new JTextField(FNAME_COL_WIDTH);
        lastName = new JTextField(LNAME_COL_WIDTH);

        JPanel editPanel = new JPanel();
        editPanel.setLayout(new BoxLayout(editPanel, BoxLayout.X_AXIS));

        JPanel labelPanel = new JPanel();
        labelPanel.setLayout(new GridLayout(0, 1));

        labelPanel.add(firstNameLabel);
        labelPanel.add(lastNameLabel);

        editPanel.add(labelPanel);

        JPanel fieldPanel = new JPanel();
        fieldPanel.setLayout(new GridLayout(0, 1));

        fieldPanel.add(firstName);
        fieldPanel.add(lastName);

        editPanel.add(fieldPanel);

        JPanel controlPanel = new JPanel();
        controlPanel.add(update);
        controlPanel.add(exit);
        update.addActionListener(controller);
        exit.addActionListener(new Handler());

        setLayout(new BorderLayout());
        add(editPanel, BorderLayout.CENTER);
        add(controlPanel, BorderLayout.SOUTH);
    }

    public Object getUpdateRef() {
        return update;
    }

    public String getFirstName() {
        return firstName.getText();
    }

    public String getLastName() {
        return lastName.getText();
    }

    public void refreshContactView(String newFirstName, String newLastName) {
        firstName.setText(newFirstName);
        lastName.setText(newLastName);

    }

    private class Handler implements ActionListener {
        public void actionPerformed(ActionEvent event) {
            System.exit(0);
        }
    }

}

显示view java 代码

import java.awt.BorderLayout;

import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import java.util.*;

class DisplayView extends JPanel implements View,Observer{
    private JTextArea display;

    public DisplayView(){
        createGui();
    }

    public void createGui(){
        setLayout(new BorderLayout());
        display = new JTextArea(10, 40);
        display.setEditable(false);
        JScrollPane scrollDisplay = new JScrollPane(display);
        this.add(scrollDisplay, BorderLayout.CENTER);
    }

    public void refreshContactView(String newFirstName,
        String newLastName){
        display.setText("UPDATED CONTACT:\nNEW VALUES:\n" +
            "\tName: " + newFirstName + " " + newLastName +
             "\n" );
            }
    public void update(Observable o, Object arg) {
        if (arg instanceof TextModel){
        String firstName=((TextModel)arg).getFirstName();
        String lastName=((TextModel)arg).getLastName();
          this.refreshContactView(firstName, lastName);
        }
    }
}

model java 代码

import java.util.Observable;


public class TextModel extends Observable {
    private String firstName;
    private String lastName;

    public TextModel(){
    }

    public void updateModel(String newFirstName, String newLastName) {

        if (!isEmptyString(newFirstName)) {
            setFirstName(newFirstName);
        }
        if (!isEmptyString(newLastName)) {
            setLastName(newLastName);
        }
    }

    public String getFirstName() {
        return firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setFirstName(String newFirstName) {
        firstName = newFirstName;//     设置变化点
       setChanged();
        notifyObservers(this);
    }

    public void setLastName(String newLastName) {
        lastName = newLastName;//       设置变化点
         setChanged();
         notifyObservers(this);
    }

    private boolean isEmptyString(String input) {
        return ((input == null) || input.equals(""));
    }


}

控制类

java 代码

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class EditController implements ActionListener {
    private TextModel model;
    private EditView view;

    public EditController(TextModel m, EditView v){
        model = m;
        view = v;
    }


    public void actionPerformed(ActionEvent evt){
        Object source = evt.getSource();
        if (source == view.getUpdateRef()){
            updateModel();
        }
    }
    private void updateModel(){
        String firstName = null;
        String lastName = null;
        if (view.getFirstName()!=null){
            firstName = view.getFirstName();
        }
        if (view.getLastName()!=null){
            lastName = view.getLastName();
        }
        model.updateModel( firstName, lastName);
    }


}

运行mvc

java 代码

import javax.swing.JFrame;
import javax.swing.JPanel;

public class RunMVCPattern {

    public static void main(String [] arguments){
        DisplayView displayView = new DisplayView();


        TextModel model = new TextModel();
        model.addObserver(  displayView);

        EditView editorView = new EditView(model);
        createGui(editorView, "Contact Edit Window");

        System.out.println("Creating DisplayView");
        createGui(displayView, " Display Window");

    }

    private static void createGui(JPanel contents, String title){
        JFrame applicationFrame = new JFrame(title);
        applicationFrame.getContentPane().add(contents);
//        applicationFrame.setSize(400, 100);
        applicationFrame.pack();//自动适应大小
       // applicationFrame.addWindowListener(new WindowClose());
      //  applicationFrame.setDefaultCloseOperation(applicationFrame.EXIT_ON_CLOSE);
        applicationFrame.setVisible(true);
    }

}