java JFileChooser选择文件和保存文件

//文件过滤器
import java.io.File;

import javax.swing.filechooser.FileFilter;

public class MyFilter extends FileFilter{
private String[] filterString = null;
public MyFilter(String[] filStrings){
this.filterString = filStrings;
}
public boolean accept(File file){
if(file.isDirectory()) return true;
for(int i=0; i<filterString.length; ++i)
if(file.getName().endsWith(filterString[i]))
return true;
/* 返回要显示的文件类型 */
/*
*   File.isDirectory()测试此抽象路径名表示的文件是否是一个目录
*/
return false;
}

public String getDescription() {
String ss = "";
for(int i=0; i<filterString.length; ++i)
ss += " *" + filterString[i];
return("Txt Files(" + ss + ")");                  //返回显示文件类型的描述
}
}

//文件的选择
　　　　　　　　　　JFileChooser jfc = new JFileChooser();
//设置文件的过滤器
String[] filterString = {".cpp", ".c"};
MyFilter filter = new MyFilter(filterString);
//获取jar包位置，设置JFileChooser当前路径
String jarFilePath = Main.class.getProtectionDomain().getCodeSource().getLocation().getFile();
try {
jarFilePath = URLDecoder.decode(jarFilePath, "UTF-8");
} catch (UnsupportedEncodingException ex) {
ex.printStackTrace();
}
jfc.setCurrentDirectory(new File(jarFilePath));
jfc.setFileFilter(filter);
jfc.showOpenDialog(null);
File fl = jfc.getSelectedFile();
if(fl != null){
String code = "";
try {
BufferedReader br = new BufferedReader(new FileReader(fl));
String newLine = null;
boolean flag = true;
while((newLine=br.readLine()) != null){
}
} catch (FileNotFoundException ex) {
ex.printStackTrace();
} catch (IOException ex) {
ex.printStackTrace();
}
}

//文件的保存
　　　　　　　　　　　　JFileChooser jfc = new JFileChooser();
String[] filterString = {".txt"};
//设置文件的过滤器
MyFilter filter = new MyFilter(filterString);
//获取jar包位置，设置JFileChooser当前路径
String jarFilePath = LexicalAnalyzer.class.getProtectionDomain().getCodeSource().getLocation().getFile();
try {
jarFilePath = URLDecoder.decode(jarFilePath, "UTF-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
jfc.setCurrentDirectory(new File(jarFilePath));
jfc.setFileFilter(filter);
jfc.showSaveDialog(null);
File fl = jfc.getSelectedFile();
OutputStreamWriter osw;
try {
osw = new OutputStreamWriter(new FileOutputStream(fl));
String text = textPane.getText();
osw.write(text, 0, text.length());
osw.flush();
osw.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}