Question

java filter 问题

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.filechooser.*;
import javax.swing.filechooser.FileNameExtensionFilter;

public class FileFilter extends JFrame{

public JLabel label;
public JTextField selectField;
public JButton button;
public JTextField selectField_size;
public FileFilter() {
super();
setTitle("文件过滤器");
setBounds(100,100,400,160);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel=new JPanel();
panel.setLayout(null);
getContentPane().add(panel);
label=new JLabel();
label.setText("图像文件名：");
label.setBounds(10, 15, 125, 25);
panel.add(label);
selectField=new JTextField();
selectField.setBounds(105, 15, 250, 25);
panel.add(selectField);
JLabel label_size=new JLabel();
label_size.setText("图像文件大小：");
label_size.setBounds(10, 55, 135, 25);
panel.add(label_size);
selectField_size=new JTextField();
selectField_size.setBounds(105, 55, 130, 25);
panel.add(selectField_size);

button=new JButton();
button.addActionListener(new ActionListener() {

@Override
public void actionPerformed(ActionEvent e) {
JFileChooser fileSelect=new JFileChooser();
int returnValue=fileSelect.showOpenDialog(getContentPane());
FileFilter filter=new FileNameExtensionFilter("图像文件(*。bmp;*.gif;*.jpg;*.jpeg)",
"bmp","gif","jpg","jpeg");
fileSelect.setFileFilter(filter);
if(returnValue==JFileChooser.APPROVE_OPTION) {
File file=fileSelect.getSelectedFile();
selectField.setText(file.getName());
selectField_size.setText(String.valueOf(file.length()));
}
}

});
button.setText("选择图像");
button.setBounds(245, 55, 109, 25);
panel.add(button);
}
public static void main(String[] args) {
FileFilter frame=new FileFilter();
frame.setVisible(true);

}

}

Answer 1

能用注解注入。如果你这样做的话就意味着你的filter也要被spring管理起来。但事实上spring并没有管理它。
改造方法：应该用ApplicationContext 从容器里获取bean。最好在init方法获取employeesService；
如：@Override
public void init(FilterConfig arg0) throws ServletException { ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext*.xml"); employeesService= (EmployeesService ) ctx.getBean("employeesService"); }