Java Swingt上传图片到指定位置

package shibie;

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.Image;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.filechooser.FileNameExtensionFilter;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFileChooser;

import java.awt.event.ActionListener;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.HashSet;
import java.awt.event.ActionEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.Font;



public class ShanggchuangFrm extends JFrame {

    private JPanel contentPane;
    private static JLabel lblNewLabel;
    private JButton btnNewButton ;
    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    ShanggchuangFrm frame = new ShanggchuangFrm();
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the frame.
     */
    public ShanggchuangFrm() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 622, 421);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        contentPane.setLayout(null);
        
        lblNewLabel = new JLabel("");
        lblNewLabel.setBounds(36, 39, 250, 250);
        contentPane.add(lblNewLabel);
        
        btnNewButton = new JButton("\u4E0A\u4F20\u56FE\u7247");
        btnNewButton.setFont(new Font("宋体", Font.BOLD, 18));
        btnNewButton.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseClicked(MouseEvent e) {
                addPicture(btnNewButton);
            }
        });
    
        btnNewButton.setBounds(355, 264, 141, 46);
        contentPane.add(btnNewButton);
    }

    
    //上传图片
    public static void addPicture(JButton button) {
          JFileChooser chooser = new JFileChooser();
          chooser.setMultiSelectionEnabled(true);
          /** 过滤文件类型 * */
          FileNameExtensionFilter filter = new FileNameExtensionFilter("jpg","png");
          chooser.setFileFilter(filter);
          int returnVal = chooser.showOpenDialog(button);
          if (returnVal == JFileChooser.APPROVE_OPTION) { 
           /** 得到选择的文件* */
           File[] arrfiles = chooser.getSelectedFiles();
           if (arrfiles == null || arrfiles.length == 0) {
            return;
           }
           //判断是否有文件为jpg或者png
         File  ff = chooser.getSelectedFile();
         //创建一个fileName得到选择文件的名字
         String fileName =ff.getName();
         //lastIndexOf(".") 返回"."在文件名中最后一次出现的下标
         //substring(int index)从指定的index开始截取后面的字符串
         //比如： a.txt 最后一次出现的.下标是 1 substring(1)就是从下标1的位置开始截取 截取后的新字符串为 .txt
         //所以这里需要+1 才能只截取文件类型 txt
         String prefix=fileName.substring(fileName.lastIndexOf(".")+1);
         //判断选择的文件是否是图片文件 必须排除不是的情况 不然后续操作会报错
         if(!(prefix.equals("jpg") || prefix.equals("png"))){
         JOptionPane.showMessageDialog(new JDialog(),":请选择.jpg 或 .png格式的图片");
         return;
         }
           FileInputStream input = null;
           FileOutputStream out = null;
           //要上传到的路径，这里可以设你要放图片的路径
           String path = "";
           try {
            for (File f : arrfiles) {
             File dir = new File(path);
             /** 目标文件夹 * */
             File[] fs = dir.listFiles();
             HashSet<String> set = new HashSet<String>();
             for (File file : fs) {
              set.add(file.getName());
             }
             /** 判断是否已有该文件* */
             if (set.contains(f.getName())) {
              JOptionPane.showMessageDialog(new JDialog(),
                f.getName() + ":该文件已存在！");
              return;
             }
             
           //通过文件选择器对象拿到选择的文件.拿到该文件的绝对路径
             String absolutePath = chooser.getSelectedFile().getAbsolutePath();
           //创建一个ImageIcon对象 传入图片文件的绝对路径
             ImageIcon imageIcon = new ImageIcon(absolutePath);
             lblNewLabel.setIcon(imageIcon);
             lblNewLabel.getIcon();
             input = new FileInputStream(f);
             byte[] buffer = new byte[1024];
             File des = new File(path, f.getName());
             out = new FileOutputStream(des);
             int len = 0;
             while (-1 != (len = input.read(buffer))) {
              out.write(buffer, 0, len);
             }
             out.close();
             input.close();
            }
            JOptionPane.showMessageDialog(null, Animal.animal(), "Animal",
              JOptionPane.PLAIN_MESSAGE);
            //com.baidu.ai.aip.Animal.animal();
           } catch (FileNotFoundException e1) {
            JOptionPane.showMessageDialog(null, "上传失败！", "提示",
              JOptionPane.ERROR_MESSAGE);
            e1.printStackTrace();
           } catch (IOException e1) {
            JOptionPane.showMessageDialog(null, "上传失败！", "提示",
              JOptionPane.ERROR_MESSAGE);
            e1.printStackTrace();
           }
          }
         }
        }