两种不同的实现mvc模式(1)

 view接口,供所有view 实现

java 代码

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

model  java 代码 

import java.util.ArrayList;
import java.util.Iterator;

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

    private ArrayList contactViews = new ArrayList();//用来存不同的视图的容器

    public TextModel(){
        this(null);
    }
    public TextModel(View view){
        firstName = "";
        lastName = "";

        if (view != null){
            contactViews.add(view);
        }
    }
    public void addContactView(View view){
        if (!contactViews.contains(view)){
            contactViews.add(view);
        }
    }

    public void removeContactView(View view){
        contactViews.remove(view);
    }

    public void updateModel(String newFirstName, String newLastName){

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

            updateView();
        }
    private void updateView(){
        Iterator notifyViews = contactViews.iterator();
        while (notifyViews.hasNext()){
            ((View)notifyViews.next()).refreshContactView(firstName, lastName);
        }
    }

    public String getFirstName(){ return firstName; }
    public String getLastName(){ return lastName; }


    public void setFirstName(String newFirstName){ firstName = newFirstName; }
    public void setLastName(String newLastName){ lastName = newLastName; }

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

用来修改的视图 构造里传入model ,同时启动控制器类

java 代码

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) {
        // TODO 自动生成方法存根
        firstName.setText(newFirstName);
        lastName.setText(newLastName);

    }

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

}

控制类,把model类和View类注册进来,通过这个类去改变model,model改变时
 * 调用自身的update方法,更新view

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 model2, EditView view2) {
        // TODO 自动生成构造函数存根
        view = view2;
        model = model2;
    }

    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);
    }
}

用来显示model数据视图

java 代码

import java.awt.BorderLayout;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;

class DisplayView extends JPanel implements View {
    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");
    }

}

整个mvc用到model controller view 都是联系起来的
 * model-->view
 * view--->model
 * controller把它们联系起来

java 代码

import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.Serializable;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class RunMVCPattern {

    public static void main(String [] arguments){

        TextModel model = new TextModel();

        EditView editorView = new EditView(model);///增加视图
        model.addContactView(editorView);
        createGui(editorView, "Contact Edit Window");

        System.out.println("Creating DisplayView");
        DisplayView displayView = new DisplayView();
        model.addContactView(displayView);
        createGui(displayView, " Display Window");
    }

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