1    /** 
2     * Class FileSaver 
3     * Shows a dialog for saving a file and eventually saves it 
4     */ 
5    package net.rmi.rmiSynth.lex; 
6     
7    import javax.swing.JOptionPane; 
8    import java.awt.FileDialog; 
9    import java.awt.Frame; 
10   import java.io.BufferedWriter; 
11   import java.io.File; 
12   import java.io.FileWriter; 
13    
14   public class FileSaver { 
15       /** 
16        * Method createFile Promts user for a 
17        * filename and saves the file 
18        * 
19        * @param source   Future file content 
20        * @param fileName Name of the file 
21        */ 
22       public void createFile(String source, 
23                              String fileName) { 
24           String fn = getSaveFileName( 
25                   "save file as", fileName);  //Show dialog 
26           //If no name is specified show warning and get out 
27           if (fn == null) { 
28               JOptionPane.showMessageDialog 
29                       (null, 
30                        "No filename is specified! operation aborted.", 
31                        "Wait a second", 
32                        JOptionPane.INFORMATION_MESSAGE); 
33               return; 
34           } 
35           //Create new file <fn> 
36           File f = new File(fn); 
37           BufferedWriter bw = null; 
38           // Open file 
39           try { 
40               bw = 
41               new BufferedWriter(new FileWriter(f)); 
42           } catch (Exception e) { 
43           } 
44           //Write 
45           try { 
46               bw.write(source); 
47           } catch (Exception e) { 
48           } 
49           //Close 
50           try { 
51               bw.close(); 
52           } catch (Exception e) { 
53           } 
54       } 
55    
56       /** 
57        * Method getSaveFileName Shows Save File 
58        * dialog 
59        * 
60        * @param prompt   Prompt to show in title 
61        *                 bar 
62        * @param fileName Name of the file 
63        * @return fn File name that user typed in 
64        */ 
65       public String getSaveFileName(String prompt, 
66                                     String fileName) { 
67           //Prepare dialog 
68           FileDialog fd = new FileDialog( 
69                   new Frame(), 
70                   prompt, 
71                   FileDialog.SAVE); 
72           fd.setFile(fileName + ".java"); 
73           //Show it 
74           fd.setVisible(true); 
75           fd.setVisible(false); 
76           //Get file name 
77           String fn = fd.getDirectory() + 
78                       fd.getFile(); 
79           if (fd.getFile() == null) return null; 
80           return fn; 
81       } 
82   }