MVP的具体代码示例
有人可以提供具体的（实际的Java代码）MVP实例吗？
这将包括以下3种类型，以及他们如何调用彼此的方法来实现模式和流程/响应客户端响应：
MVP是我最喜欢的创建UI的设计模式。
MVP和MVC最大的区别就是如何处理视图。
有许多风格来编制MVP。
以正式方式，包括为设计模式的每个元素创建接口。
/*-- file: Application.java --*/
import javax.swing.JOptionPane;
/**
*
* @author danLeon
*/
interface LoginModel {
String getUser();
void setUser(String user);
}
class MyLoginModel implements LoginModel {
String user;
@Override
public String getUser() {
return user;
}
@Override
public void setUser(String user) {
this.user = user;
}
}
interface LoginView {
LoginPresenter getPresenter();
void setPresenter(LoginPresenter loginPresenter);
void updateModelFromView();
void updateViewFromModel();
void open();
void close();
void userRejected();
}
class MyLoginView extends javax.swing.JFrame implements LoginView {
private LoginPresenter loginPresenter;
/**
* Creates new form MyLoginView
*/
public MyLoginView() {
initComponents();
}
@SuppressWarnings("unchecked")
private void initComponents() {
java.awt.GridBagConstraints gridBagConstraints;
jLabel1 = new javax.swing.JLabel();
jTextField1 = new javax.swing.JTextField();
jLabel2 = new javax.swing.JLabel();
jButton1 = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setBounds(new java.awt.Rectangle(0, 0, 0, 0));
java.awt.GridBagLayout layout = new java.awt.GridBagLayout();
layout.columnWidths = new int[] {0, 7, 0};
layout.rowHeights = new int[] {0, 7, 0, 7, 0};
getContentPane().setLayout(layout);
jLabel1.setFont(new java.awt.Font("Tahoma", 1, 11)); // NOI18N
jLabel1.setText("Welcome");
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridx = 0;
gridBagConstraints.gridy = 0;
gridBagConstraints.gridwidth = 3;
getContentPane().add(jLabel1, gridBagConstraints);
jTextField1.setColumns(13);
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridx = 2;
gridBagConstraints.gridy = 2;
gridBagConstraints.fill = java.awt.GridBagConstraints.HORIZONTAL;
getContentPane().add(jTextField1, gridBagConstraints);
jLabel2.setText("User");
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridx = 0;
gridBagConstraints.gridy = 2;
getContentPane().add(jLabel2, gridBagConstraints);
jButton1.setText("Login");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
gridBagConstraints = new java.awt.GridBagConstraints();
gridBagConstraints.gridx = 2;
gridBagConstraints.gridy = 4;
getContentPane().add(jButton1, gridBagConstraints);
pack();
}
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
getPresenter().login();
}
private javax.swing.JButton jButton1;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JTextField jTextField1;
@Override
public void updateModelFromView() {
getPresenter().getModel().setUser(jTextField1.getText());
}
@Override
public void updateViewFromModel() {
jTextField1.setText(getPresenter().getModel().getUser());
}
@Override
public void open() {
setVisible(true);
jTextField1.selectAll();
jTextField1.requestFocus();
}
@Override
public void close() {
dispose();
}
@Override
public void userRejected() {
jLabel1.setText("Try again!");
jTextField1.selectAll();
jTextField1.requestFocus();
}
@Override
public LoginPresenter getPresenter() {
return loginPresenter;
}
@Override
public void setPresenter(LoginPresenter loginPresenter) {
this.loginPresenter = loginPresenter;
}
}
interface LoginPresenter {
LoginModel getModel();
void setModel(LoginModel loginModel);
LoginView getView();
void setView(LoginView loginView);
void setOnLogin(Runnable onLogin);
void run();
void login();
}
class MyLoginPresenter implements LoginPresenter {
LoginModel loginModel;
LoginView loginView;
private Runnable onLogin;
@Override
public LoginModel getModel() {
return loginModel;
}
@Override
public void setModel(LoginModel loginModel) {
this.loginModel = loginModel;
}
@Override
public LoginView getView() {
return loginView;
}
@Override
public void setView(LoginView loginView) {
this.loginView = loginView;
}
@Override
public void setOnLogin(Runnable onLogin) {
this.onLogin = onLogin;
}
@Override
public void run() {
loginModel.setUser("previousUser");
loginView.setPresenter(this);
loginView.updateViewFromModel();
loginView.open();
}
@Override
public void login() {
loginView.updateModelFromView();
if (loginModel.getUser().equalsIgnoreCase("root")) {
loginView.close();
loginView.setPresenter(null);// for memory sanity.
onLogin.run();
} else {
loginView.userRejected();
}
}
}
public class Application {
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
LoginModel loginModel = new MyLoginModel();
LoginPresenter loginPresenter = new MyLoginPresenter();
loginPresenter.setModel(loginModel);
LoginView loginView = new MyLoginView();
loginPresenter.setView(loginView);
loginPresenter.setOnLogin(new Runnable() {
@Override
public void run() {
JOptionPane.showMessageDialog(null, "Welcome user!");
}
});
loginPresenter.run();
}
});
}
}