一个简单Swing程序的架构

Java Swing程序不像J2EE程序那样有框架有模式可遵，反倒显得很自由无所拘束，但如些一来反而显得程序代码杂乱无章，如果只是写个示例程序的话倒也无所谓，但随着代码的增多或过段时间在回首时就发现代码很不容易看懂，不以维护。我虽无大型Swing程序的经验，但平素喜爱用Swing写写工具程序以练练手，因此我以下是我的经验总结。下面以些图来表示

一个桌面级程序必然是以一个主界面展开的，在Swing中这个主界面是派生自JFrame的，其中有菜单、工具栏、状态栏、内容面板（contentPanel）和一些相应的按钮，这些界面元素即可以派生自某个类或调用Swing的现成类，但最后总要添加到界面中，而为了与用户交互，控件要和一个实现了Action接口的类绑定，因此在界面层中我分别实例化了ActionsManager和Functions对象，我专门写了一个ActionsManager类的用以管理程序中所有的Action接口的类，通过键值对集合把某个控件的动作与相应的控件绑定，当然你可能会觉得这很无聊，还不如在构造控件时直接将动作与之绑定就可以了，但这样做时很没有重复性，如果某个动作即要被按钮实现又要被菜单实现，还要被工具栏实现的话就要重复写三次代码，如果还要考虑其禁用与否就更麻烦了，因此我干脆将动作类统统封装在一个集合中统一调用，比如如下的代码
public class LoginActions {private MainPanel mainPanel;private LoginManager loginManager;private Map<String,LoginAction> mapActions;public LoginActions(){mapActions = new HashMap<String,LoginAction>();new LoginAction("新建(N)","image/newfile.gif","image/tbnew.png",KeyEvent.VK_N,"ctrl N","new"){public void actionPerformed(ActionEvent e) {mainPanel.newFile();}};new LoginAction("打开(O)...","image/open.gif","image/tbopen.png",KeyEvent.VK_O,"ctrl O","open"){public void actionPerformed(ActionEvent e) {mainPanel.openFromFile();}};new LoginAction("保存(S)","image/save.gif","image/tbsave.png",KeyEvent.VK_S,"ctrl S","save"){public void actionPerformed(ActionEvent e) {if(loginManager.isModifyFlag())mainPanel.saveToFile(false);}};new LoginAction("另存为(A)...",null,null,KeyEvent.VK_A,null,"saveas"){public void actionPerformed(ActionEvent e) {if(loginManager.isModifyFlag())mainPanel.saveToFile(true);}};new LoginAction("导出(E)...",null,"image/tbexport.png",KeyEvent.VK_E,null,"export"){public void actionPerformed(ActionEvent e) {mainPanel.exprotFile();}};new LoginAction("退出(X)",null,"image/tbexit.png",KeyEvent.VK_X,"ctrl alt X","exit"){public void actionPerformed(ActionEvent e) {mainPanel.ExitApplication();}};new LoginAction("复制(C)","image/copy.gif",null,KeyEvent.VK_C,"ctrl C","copy"){public void actionPerformed(ActionEvent e) {mainPanel.bottomPanel.editMenuCopy();}};new LoginAction("粘贴(P)","image/paste.gif",null,KeyEvent.VK_P,"ctrl V","paste"){public void actionPerformed(ActionEvent e) {mainPanel.bottomPanel.editMenuPaste();}};new LoginAction("剪切(X)","image/cut.gif",null,KeyEvent.VK_X,"ctrl X","cut"){public void actionPerformed(ActionEvent e) {mainPanel.bottomPanel.editMenuCut();}};new LoginAction("清除输入(R)",null,null,KeyEvent.VK_R,null,"reinput"){public void actionPerformed(ActionEvent e) {mainPanel.bottomPanel.resetInput();}};new LoginAction("新增分类(A)",null,null,KeyEvent.VK_A,null,"addType"){public void actionPerformed(ActionEvent e) {mainPanel.showTypeDlg(true);}};new LoginAction("删除分类(D)",null,null,KeyEvent.VK_D,null,"delType"){public void actionPerformed(ActionEvent e) {mainPanel.deleteType();}};new LoginAction("修改分类(M)",null,null,KeyEvent.VK_M,null,"modifyType"){public void actionPerformed(ActionEvent e) {mainPanel.showTypeDlg(false);}};new LoginAction("新增记录(D)",null,null,KeyEvent.VK_D,null,"addLogin"){public void actionPerformed(ActionEvent e) {mainPanel.bottomPanel.addLogin();}};new LoginAction("删除记录(E)",null,null,KeyEvent.VK_E,null,"delLogin"){public void actionPerformed(ActionEvent e) {mainPanel.bottomPanel.deleteLogin();}};new LoginAction("修改记录(O)",null,null,KeyEvent.VK_O,null,"modifyLogin"){public void actionPerformed(ActionEvent e) {mainPanel.bottomPanel.modifyLogin();}};new LoginAction("查找(F)","image/tbfind.png",null,KeyEvent.VK_F,null,"findLogin"){public void actionPerformed(ActionEvent e) {mainPanel.rightPanel.find();}};new LoginAction("转至地址(L)",null,null,KeyEvent.VK_L,null,"goURL"){public void actionPerformed(ActionEvent e) {mainPanel.bottomPanel.goUrl();}};new LoginAction("刷新(U)","image/refresh.gif","image/tbudpate.png",KeyEvent.VK_U,null,"refresh"){public void actionPerformed(ActionEvent e) {mainPanel.updatePanelUI();}};new LoginAction("程序设置(S)...","image/setup.gif","image/tbOption.png",KeyEvent.VK_S,null,"setup"){public void actionPerformed(ActionEvent e) {mainPanel.showSetupDlg();}};new LoginAction("关于(A)...","image/about.gif","image/tbHelp.png",KeyEvent.VK_A,null,"about"){public void actionPerformed(ActionEvent e) {mainPanel.showAboutDlg();}};}public Action getAction(String command){return mapActions.get(command);}public void setMainPanel(MainPanel mainPanel){this.mainPanel = mainPanel;}public void setLoginManager(LoginManager loginManager){this.loginManager = loginManager;}abstract class LoginAction extends AbstractAction{public LoginAction(String name,String icon,String bigIcon,int memKey,String stroke,String command){this.putValue(NAME, name);if(icon!=null)this.putValue(Action.SMALL_ICON, new ImageIcon(this.getClass().getClassLoader().getResource(icon)));elsethis.putValue(Action.SMALL_ICON, new ImageIcon(this.getClass().getClassLoader().getResource("image/mnuNullIcon.gif")));if(bigIcon!=null)this.putValue(Action.LARGE_ICON_KEY, new ImageIcon(this.getClass().getClassLoader().getResource(bigIcon)));if(memKey!=0)this.putValue(Action.MNEMONIC_KEY, memKey);if(stroke!=null)this.putValue(Action.ACCELERATOR_KEY, KeyStroke.getKeyStroke(stroke));this.putValue("command", command);mapActions.put(command, this);}}}
然后在所有的控件容器类中实现相关的功能，让ActionsManager类的相应Action接口类来调用即可，而将界表示层和业务逻辑层分离已是众所皆知的道理，因此在ActionsManager内的主界面对象实例可以访问界面的UI Manager方法集，由UI Manager再调用相应的业务逻辑层，即Functions内的方法，并把结果返回至UI Manager，以此来实现动作层、表示层和业务层的简单框架。