java ÓÃÎļþ¶Ô»°¿ò´ò¿ªÎļþ

//ÎļþµÄ´ò¿ª
import java.awt.FileDialog;
import java.awt.event.*;
import java.io.*;
import java.io.File;
import java.io.FileReader;
public class FileOpen {
private FileDialog filedialog_open;
private String fileopen = null, filename = null;// ÓÃÓÚ´æ·Å´ò¿ªÎļþµØÖ· ºÍÎļþÃû
private File file1; // Îļþ×Ö½ÚÁ÷¶ÔÏó
private FileReader file_reader;//Îļþ×Ö·ûÁ÷¶ÔÏó
private BufferedReader in;//ÎļþÐжÁÈ¡ дÈë¶ÔÏó
private StringBuffer text = new StringBuffer();

HaffmanFrame haffman= null;
FileOpen(HaffmanFrame hf) {
haffman = hf;
filedialog_open = new FileDialog(haffman, "´ò¿ªÎļþ¶Ô»°¿ò", FileDialog.LOAD);
// ´ò¿ªÎļþ¶Ô»°¿òÊÊÅäÆ÷
filedialog_open.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
filedialog_open.setVisible(false);
}
});
}
public void open() {
String s = "";
filedialog_open.setVisible(true);
fileopen = filedialog_open.getDirectory();// ·µ»ØÎļþ¶Ô»°¿òÖÐÏÔʾµÄÎļþËùÊôµÄĿ¼
filename = filedialog_open.getFile();// ·µ»Øµ±Ç°Îļþ¶Ô»°¿òÖÐÏÔʾµÄÎļþÃûµÄ×Ö·û´®±íʾ
// Èç¹û²»´æÔھͷµ»ØNULL
if (filename != null)// Åжϴò¿ªµÄÎļþÊÇ·ñ´æÔÚ
{
try {
file1 = new File(fileopen,filename );
file_reader = new FileReader(file1);
in = new BufferedReader(file_reader);//ÿ´Î¶ÁÈ¡Ò»ÐÐ
while ((s = in.readLine()) != null)
text.append(s + '\n');
in.close();
file_reader.close();
} catch (IOException e2) {
System.out.println("²»ÄÜ´ò¿ªÎļþ£¡");
}
}
}
//·µ»ØµÃµ½µÄÎı¾×Ö·û´®
public String getText() {
return new String(text);
}
}