用AWT做的记事本怎么写保存代码?

Question

我用AWT做的一个很很简单的记事本.另存为功能做好了，我想问下直接保存那个功能的代码要怎么写啊?   就是点保存时,没有对话框出来,直接保存.   代码如下: 
import   java.awt.*; 
import   java.awt.event.*; 
import   java.awt.datatransfer.*; 
import   java.io.*; class   MainWindow   extends   Frame   implements   ActionListener 
{ 
MenuBar   menubar; 
Menu   document,edit; 
MenuItem   open,close,save,tosave,exit,copy,cut,paste; 
Clipboard   clipboard=null; 
TextArea     textarea; 
FileDialog   fileSave,fileLoad; 
BufferedReader   bufRead; 
FileReader   fileRead; 
BufferedWriter   bufWriter; 
FileWriter   fileWriter; 
        MainWindow() 
        { 
        super( "文本编辑器 "); 
        clipboard=getToolkit().getSystemClipboard();//获得系统剪贴板 
                menubar=new   MenuBar(); 
        document=new   Menu( "文件 "); 
                edit=new   Menu( "编辑 "); 
                open=new   MenuItem( "打开 "); 
                close=new   MenuItem( "关闭 "); 
                save=new   MenuItem( "保存 "); 
                tosave=new   MenuItem( "另存为 "); 
                exit=new   MenuItem( "退出 "); 
                copy=new   MenuItem( "复制 "); 
                cut=new   MenuItem( "剪切 "); 
                paste=new   MenuItem( "粘贴 "); 
                textarea=new   TextArea(); 
                fileSave=new   FileDialog(this, "保存文件对话框 ",FileDialog.SAVE); 
                fileLoad=new   FileDialog(this, "打开文件对话框 ",FileDialog.LOAD); 
                fileSave.addWindowListener(new   WindowAdapter() 
                                                        { 
                                                                        public   void   windowClosing(WindowEvent   e) 
                                                                        { 
                                                                        fileSave.setVisible(false); 
                                                                        } 
                  
                                                        } 
                
                                                                        ); 
                fileLoad.addWindowListener(new   WindowAdapter() 
                                                        { 
                                                                                  public   void   windowClosing(WindowEvent   e) 
                                                                                  { 
                                                                                  fileLoad.setVisible(false); 
                                                                                  } 
                                                        }     
                                                                      ); 
                this.open.addActionListener(this); 
                this.tosave.addActionListener(this); 
                this.copy.addActionListener(this); 
                this.cut.addActionListener(this); 
                this.paste.addActionListener(this); 
                this.exit.addActionListener(this); 
                this.save.addActionListener(this); 
                setLayout(new   FlowLayout()); 
                
                document.add(open);document.add(save);document.add(tosave); 
                document.add(close);document.add(exit); 
                edit.add(copy);edit.add(cut);edit.add(paste); 
                menubar.add(document);menubar.add(edit); 
                setMenuBar(menubar); 
                add(textarea); 
                setBounds(200,150,500,450); 
                setVisible(true); 
                validate(); 
                addWindowListener(new   WindowAdapter() 
                                { 
                              public   void   windowClosing(WindowEvent   e) 
                                      { 
                              System.exit(0); 
                                      } 
                                } 
                                                  ); 
                
        } 
        public   void   actionPerformed(ActionEvent   e) 
        { 
        if(e.getSource()==copy)   //实现复制功能 
        { 
        String   selected=textarea.getSelectedText(); 
        StringSelection   text=new   StringSelection(selected);   
        clipboard.setContents(text,null); 
        } 
        else   if(e.getSource()==cut)     //实现剪切功能 
        { 
        String   selected=textarea.getSelectedText(); 
        StringSelection   text=new   StringSelection(selected); 
        clipboard.setContents(text,null); 
        int   start=textarea.getSelectionStart(); 
        int   end=textarea.getSelectionEnd(); 
        textarea.replaceRange( " ",start,end); 
        } 
        else   if(e.getSource()==paste)     //实现粘贴功能 
        { 
        Transferable   contents=clipboard.getContents(this); 
        DataFlavor     flavor=   DataFlavor.stringFlavor; 
                        if(   contents.isDataFlavorSupported(flavor)) 
                                try{     
                                    String   str; 
                                            str=(String)contents.getTransferData(flavor); 
                                            textarea.append(str);//将剪贴板内容作为字符串添加到文本区中 
                                      } 
                                catch(Exception   ee) 
                                { 
                                
                                } 
        } 
        else   if(e.getSource()==open)     //实现打开文件 
        { 
        fileLoad.setVisible(true); 
        this.textarea.setText(null); 
        String   s; 
        if(fileLoad.getFile()!=null) 
        { 
        try 
        { 
        File   file=new   File(fileLoad.getDirectory(),fileLoad.getFile()); 
                                        fileRead=new   FileReader(file); 
                                        bufRead=new   BufferedReader(fileRead); 
                                        while((s=bufRead.readLine())!=null) 
                                        { 
                                        this.textarea.append(s+ '\n '); 
                                        } 
                                        bufRead.close(); 
                                        fileRead.close(); 
        } 
        catch(IOException   e1) 
        { 
        
        } 
        } 
        
        } 
        else   if(e.getSource()==tosave)     //实现另存为功能 
        { 
        fileSave.setVisible(true); 
        if(fileSave.getFile()!=null) 
        { 
        try 
        { 
        File   file=new   File(fileSave.getDirectory(),fileSave.getFile()); 
        fileWriter=new   FileWriter(file); 
        bufWriter=new   BufferedWriter(fileWriter); 
        bufWriter.write(this.textarea.getText(),0,(textarea.getText()).length()); 
        bufWriter.flush(); 
        bufWriter.close(); 
        fileWriter.close(); 
        } 
        catch(IOException   e2) 
        {} 
        }         
        } 
        else   if(e.getSource()==this.exit)       //退出 
        { 
            System.exit(0); 
        } 
        else   if(e.getSource()==save)       //保存功能。这个该怎么写呀？ 
        { 
            
        }         } 
} 
public     class   WindowMain 
{ 
public   static   void   main(String   args[]) 
{ 
MainWindow   mw=new   MainWindow(); 
} 
} 

Answer 1

其实是这样的,如果你的文件是第一次创建,显示的界面肯定是"另存为".这点你可以打开记事本或者WORD创建个新文件,点"保存"看看,一定会弹出"另存为"界面.
我给你个思路,你可以设置一个标志位,随便设,来标明当前文件为新文件．比如boolean isNewFile=true;　增加一个tempFile临时存放当前文件：File tempFile;(当然，这是针对你的代码而写的，如果是我写记事本，我可能不会用到，因为每个人的思路不同嘛）
然后当触发保存　if(e.getSource()==save){
                  if(isNewFile){           //此文件是新创建文件，执行另存为操作．
                        fileSave.setVisible(true);   
                        if(fileSave.getFile()!=null){   
                           try   
                            {   
                               File       file=new       File(fileSave.getDirectory(),fileSave.getFile());     
                            
                           tempFile=file;     //通过tempFile存放当前文件．                                fileWriter=new       FileWriter(file);   
                            bufWriter=new       BufferedWriter(fileWriter);   
                            bufWriter.write(this.textarea.getText(),0,(textarea.getText()).length());    
                            bufWriter.flush();   
                            bufWriter.close();   
                            fileWriter.close();   　　　　　　　　　　　　　　　　isNewFile=false;　//将标记置为false，则再次选择＂保存＂选项时不会弹出＂另存为＂界面．
                            }   
                           catch(IOException       e2)   
                            {}   
                         }
                    }
                    else{　　　　　　　　//此文件是已存在文件，执行保存操作．
　　　　　　　　　　　　　   try{
                            
                            File saveFileName=tempFile;       //将fileWriter指定为tempFile所保存的文件，即当前文件．我这多用了些File类实例，目的是为了看得清楚些，也可以不要saveFileName，直接FileWriter(tempFile)；   
                                
                            fileWriter=new       FileWriter(saveFileName);   
                            bufWriter=new       BufferedWriter(fileWriter);   
                            bufWriter.write(this.textarea.getText(),0,(textarea.getText()).length());    
                            bufWriter.flush();   
                            bufWriter.close();   
                            fileWriter.close();   
                          }catch(Exception ee){
                            ee.printStackTrace();
                          }                                
                         }     
                          
                       }还要在＂打开＂功能相关代码里加上 tempFile=file;isNewFile=false;
我自己运行了下，可以了，点击＂保存＂选项不会再弹出另存框了．打开相应的文件，内容已经更改．

Answer 2

程序里为文件存储一个路径
如果新建的,那么这个路径为null
如果是打开的,那么这个路径为打开文件时文件的路径选保存的时候,如果路径为null,则显示对话框,相当于另存为
如果路径不为null,则按照此路径来保存文件内容