GUI界面，客户端向服务端传送文件

1.客户端代码：

package com.socket;

import java.awt.EventQueue;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.io.*;
import java.net.Socket;
import javax.swing.GroupLayout;
import javax.swing.GroupLayout.Alignment;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.border.EmptyBorder;

public class TCPClientSocket extends JFrame {

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	public JPanel contentPane;
	public JTextField textField;
	public JTextField textField_1;

	// public JTextField textField_2;

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

	/**
	 * Create the frame.
	 */
	public TCPClientSocket() {
		setTitle("客户端文件传输");
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 351, 300);
		contentPane = new JPanel();
		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
		setContentPane(contentPane);

		JLabel lblNewLabel = new JLabel("用户名");

		JLabel lblNewLabel_1 = new JLabel("文件路径");

		textField = new JTextField();
		textField.setColumns(10);

		textField_1 = new JTextField();
		textField_1.setColumns(10);

		JButton btnNewButton = new JButton("提交");
		GroupLayout gl_contentPane = new GroupLayout(contentPane);

		gl_contentPane
				.setHorizontalGroup(gl_contentPane
						.createParallelGroup(Alignment.LEADING)
						.addGroup(
								gl_contentPane
										.createSequentialGroup()
										.addGroup(
												gl_contentPane
														.createParallelGroup(
																Alignment.LEADING)
														.addGroup(
																gl_contentPane
																		.createSequentialGroup()
																		.addGap(44)
																		.addGroup(
																				gl_contentPane
																						.createParallelGroup(
																								Alignment.LEADING)
																						.addComponent(
																								lblNewLabel_1)
																						.addComponent(
																								lblNewLabel))
																		.addGap(18)
																		.addGroup(
																				gl_contentPane
																						.createParallelGroup(
																								Alignment.LEADING,
																								false)
																						.addComponent(
																								textField_1,
																								GroupLayout.DEFAULT_SIZE,
																								143,
																								Short.MAX_VALUE)
																						.addComponent(
																								textField,
																								GroupLayout.DEFAULT_SIZE,
																								143,
																								Short.MAX_VALUE)))

														.addGroup(
																gl_contentPane
																		.createSequentialGroup()
																		.addGap(103)
																		.addComponent(
																				btnNewButton)))
										.addContainerGap(159, Short.MAX_VALUE)));

		gl_contentPane
				.setVerticalGroup(gl_contentPane
						.createParallelGroup(Alignment.LEADING)
						.addGroup(
								gl_contentPane
										.createSequentialGroup()
										.addGap(25)
										.addGroup(
												gl_contentPane
														.createParallelGroup(
																Alignment.BASELINE)
														.addComponent(
																lblNewLabel)
														.addComponent(
																textField,
																GroupLayout.PREFERRED_SIZE,
																GroupLayout.DEFAULT_SIZE,
																GroupLayout.PREFERRED_SIZE))
										.addGap(38)
										.addGroup(
												gl_contentPane
														.createParallelGroup(
																Alignment.BASELINE)
														.addComponent(
																lblNewLabel_1)
														.addComponent(
																textField_1,
																GroupLayout.PREFERRED_SIZE,
																GroupLayout.DEFAULT_SIZE,
																GroupLayout.PREFERRED_SIZE))
										.addGap(39).addComponent(btnNewButton)
										.addContainerGap(105, Short.MAX_VALUE)));

		contentPane.setLayout(gl_contentPane);

		// String filePath = textField_1.getText();

		try {
			Socket socket = new Socket(TCPServerSocket.IP, TCPServerSocket.PORT);
			if (true) {
				btnNewButton.addMouseListener(new MouseListener() {
					@Override
					public void mouseReleased(MouseEvent arg0) {

					}

					@Override
					public void mousePressed(MouseEvent arg0) {

					}

					@Override
					public void mouseExited(MouseEvent arg0) {

					}

					@Override
					public void mouseEntered(MouseEvent arg0) {

					}

					@Override
					public void mouseClicked(MouseEvent arg0) {

						String filePath = textField_1.getText().toString();
						String userName = textField.getText().toString();

						sendFile(socket, filePath, userName);

					}
				});

				/*
				 * pp.btnNewButton.addActionListener(new ActionListener() {
				 * 
				 * public void actionPerformed(ActionEvent e) { sendFile(socket,
				 * filePath); } });
				 */
			}

		} catch (Exception e) {
			// e.printStackTrace();
		}
	}

	private static void sendFile(Socket socket, String filePath, String userName) {
		System.out.println(filePath);

		DataOutputStream dos = null;
		BufferedInputStream bis = null;
		// What can BufferedInputStream help ?
		// FileInputStream fis = null;
		byte[] bytes = new byte[1024];

		try {
			try {
				if (socket.isClosed()) {
					socket = new Socket(TCPServerSocket.IP,
							TCPServerSocket.PORT);
				}
				bis = new BufferedInputStream(new FileInputStream(new File(
						filePath)));
				dos = new DataOutputStream(new BufferedOutputStream(
						socket.getOutputStream()));

				dos.writeUTF(getFileName(filePath) + "##" + userName);

				int length = 0;
				while ((length = bis.read(bytes, 0, bytes.length)) > 0) {
					dos.write(bytes, 0, length);
					dos.flush();
				}

			} catch (IOException e) {
				e.printStackTrace();
			} finally {

				if (bis != null)
					bis.close();
				if (dos != null)
					dos.close();
				if (socket != null)
					socket.close();
			}
		} catch (IOException e) {
			e.printStackTrace();
		}

	}

	private static String getFileName(String filePath) {
		String[] parts = filePath.split("/");
		return parts[parts.length - 1];
	}
}
package com.socket;

import java.