java swing 界面显示 选择文件框选并且选择的文件显示,下面 ip地址输入框 端口号输入框,端口测试按钮 ，实现文件传输

以下是一个简单的Java Swing界面，包含选择文件框、IP地址输入框、端口号输入框和端口测试按钮。选择文件后，文件路径会显示在界面上。点击端口测试按钮会尝试连接输入的IP地址和端口号，如果连接成功，会弹出对话框显示“连接成功”，否则会显示“连接失败”。

import java.awt.BorderLayout;
import java.awt.EventQueue;
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.border.EmptyBorder;

public class FileTransferUI extends JFrame {

    private JPanel contentPane;
    private JTextField ipTextField;
    private JTextField portTextField;
    private JTextField fileTextField;

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    FileTransferUI frame = new FileTransferUI();
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the frame.
     */
    public FileTransferUI() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 450, 300);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        contentPane.setLayout(null);

        JLabel lblNewLabel = new JLabel("IP地址：");
        lblNewLabel.setBounds(10, 10, 54, 15);
        contentPane.add(lblNewLabel);

        ipTextField = new JTextField();
        ipTextField.setBounds(74, 7, 100, 21);
        contentPane.add(ipTextField);
        ipTextField.setColumns(10);

        JLabel lblNewLabel_1 = new JLabel("端口号：");
        lblNewLabel_1.setBounds(184, 10, 54, 15);
        contentPane.add(lblNewLabel_1);

        portTextField = new JTextField();
        portTextField.setBounds(248, 7, 66, 21);
        contentPane.add(portTextField);
        portTextField.setColumns(10);

        JButton testBtn = new JButton("端口测试");
        testBtn.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                String ip = ipTextField.getText().trim();
                String portStr = portTextField.getText().trim();
                int port = Integer.parseInt(portStr);
                boolean success = FileTransferUtil.testConnection(ip, port);
                if (success) {
                    JOptionPane.showMessageDialog(FileTransferUI.this, "连接成功");
                } else {
                    JOptionPane.showMessageDialog(FileTransferUI.this, "连接失败");
                }
            }
        });
        testBtn.setBounds(324, 6, 93, 23);
        contentPane.add(testBtn);

        JButton fileBtn = new JButton("选择文件");
        fileBtn.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                JFileChooser chooser = new JFileChooser();
                int result = chooser.showOpenDialog(FileTransferUI.this);
                if (result == JFileChooser.APPROVE_OPTION) {
                    File file = chooser.getSelectedFile();
                    fileTextField.setText(file.getAbsolutePath());
                }
            }
        });
        fileBtn.setBounds(10, 50, 93, 23);
        contentPane.add(fileBtn);

        fileTextField = new JTextField();
        fileTextField.setEditable(false);
        fileTextField.setBounds(113, 50, 304, 21);
        contentPane.add(fileTextField);
        fileTextField.setColumns(10);
    }
}

其中，`FileTransferUtil`是一个工具类，用于测试连接，具体实现可以根据需要自行编写。`JOptionPane`是Java Swing提供的对话框组件，用于显示连接成功或失败的信息。