JFileChooser 保存上次打开文件的路径

量身打造 请测试...import java.awt.event.*;
import javax.swing.*;
import java.io.*;
import java.util.Properties;public class FileChooser extends JFrame implements ActionListener{
private JButton open;
private JFileChooser chooser;
private String latestPath ;
private Profile profile;
public FileChooser() {
profile = new Profile();//每次运行程序时创建配置文件Profile对象
latestPath = (profile.read()?profile.latestPath:"C:/");//读取配置文件里的参数Profile并赋值给latestPath
open = new JButton("open");
this.add(open);
this.setSize(200,150);
this.setLocationRelativeTo(null);//窗口居中
this.setVisible(true);
open.addActionListener(this);
this.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent we){
profile.write(latestPath);//每次退出程序时把最后一次打开的目录写入到配置文件
}
});
} public static void main(String[] args) {
new FileChooser();
} public void actionPerformed(ActionEvent arg0) {
if(!new File(latestPath).exists()){
latestPath = "C:/";
}else{
chooser = new JFileChooser(latestPath);
int returnVal = chooser.showOpenDialog(this);
if(returnVal == JFileChooser.APPROVE_OPTION) {
File file = chooser.getSelectedFile();
//其他操作...
latestPath = file.getParent();//每次退出文件选择器后更新目录Properties
}
}
}
}class Profile{
String latestPath = "C:/";
File file = new File("C:/JavaCode/FileChooser/set.ini");
public Profile(){}

boolean create(){
boolean b = true;
if(file!=null){
File directory = file.getParentFile();//获得文件的父目录
if(!directory.exists()){//目录不存在时
b = directory.mkdirs();//创建目录
}else{//存在目录
if(!file.exists()){//配置文件不存在时
try {
b = file.createNewFile();//创建配置文件
} catch (IOException e) {
b = false;
}
}
}
} return b;
}

boolean read(){
Properties pro;//属性集
FileInputStream is = null;
boolean b = true;
if(!file.exists()){//配置文件不存在时
b = create();//创建一个
if(b)//创建成功后
b = write(latestPath);//初始化
else//创建失败即不存在配置文件时弹出对话框提示错误
JOptionPane.showConfirmDialog(null, "对不起，不存在配置文件！", "错误",
JOptionPane.YES_NO_OPTION,
JOptionPane.ERROR_MESSAGE);
}else{
try {
is = new FileInputStream(file);
pro = new Properties();
pro.load(is);//读取属性
latestPath = pro.getProperty("latestPath");//读取配置参数latestPath的值
is.close();
}
catch (IOException ex) {
ex.printStackTrace();
b = false;
}
}
return b;
}

boolean write(String latestPath){
this.latestPath = latestPath;
Properties pro = null;
FileOutputStream os = null;
boolean b = true;
try {
os = new FileOutputStream(file);
pro = new Properties();

pro.setProperty("latestPath",latestPath);

pro.store(os,null); //将属性写入
os.flush();
os.close();

System.out.println("latestPath=" + latestPath);

}
catch (IOException ioe) {
b = false;
ioe.printStackTrace();
}
return b;
}
}

如果不重启的话可以放在全局变量中如果重启的话我建议你放在配置文件中.然后把配置文件放在硬盘上即可