GUI(打开、保存文件)

来源：互联网发布：ck jeans 知乎编辑：程序博客网时间：2024/05/18 14:43
/*打开文件*/package gui6;import java.awt.*;import java.awt.event.*;import java.io.*;class GUIDemo6 {private Frame f;private MenuBar mb;private Menu fileMenu;private MenuItem openItem;private MenuItem saveItem;private MenuItem closeItem;private FileDialog openDialog;private FileDialog saveDialog;private TextArea ta;private File file;GUIDemo6(){init();}//初始化组件public void init(){f=new Frame("窗口");mb=new MenuBar();fileMenu=new Menu("文件");openItem=new MenuItem("打开");saveItem=new MenuItem("保存");closeItem=new MenuItem("退出");ta=new TextArea();        openDialog=new FileDialog(f,"openFile",FileDialog.LOAD);saveDialog=new FileDialog(f,"saveFile",FileDialog.SAVE);    f.setBounds(300,200,600,500);f.setMenuBar(mb);mb.add(fileMenu);fileMenu.add(openItem);fileMenu.add(saveItem);fileMenu.add(closeItem);f.add(ta);myEvent();f.setVisible(true);}//监听事件public void myEvent(){   //保存监听事件saveItem.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){if(file==null){saveDialog.setVisible(true);String dir=saveDialog.getDirectory();String fileName=saveDialog.getFile();if(dir==null || fileName==null)return; file=new File(dir,fileName);}BufferedWriter bufw=null;try{bufw=new BufferedWriter(new FileWriter(file));String text=ta.getText();System.out.println(text);bufw.write(text);bufw.flush();}catch (IOException exce){throw new RuntimeException("写入失败");}finally{try{if(bufw!=null)bufw.close();}catch (IOException excep){}}}});//打开监听事件openItem.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){              openDialog.setVisible(true);  String dir=openDialog.getDirectory();  String fileName=openDialog.getFile();  if(dir==null || fileName==null)  return;  else { BufferedReader bufr=null;  try  { ta.setText(""); File file=new File(dir,fileName);     FileReader fr=new FileReader(file);     bufr=new BufferedReader(fr);     String line=null;  while((line=bufr.readLine())!=null)  {  ta .append(line+"\r\n");  }  }  catch (IOException exc)  {  } finally{ try {if(bufr!=null)bufr.close(); } catch (IOException ex) { } }  }}});}public static void main(String[] args) {    new GUIDemo6();}}
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