目录 一、题目描述 二、解题思路 三、代码详解 一、题目描述 题目实现:使用网络编程时,需要通过Socket传递图片。 二、解题思路 创建一个服务器类:ServerSocketFrame,继承JFrame类 写一
目录
- 一、题目描述
- 二、解题思路
- 三、代码详解
一、题目描述
题目实现:使用网络编程时,需要通过Socket传递图片。
二、解题思路
创建一个服务器类:ServerSocketFrame,继承JFrame类
写一个getserver() 方法,实例化Socket对象,启用9527当服务的端口。
创建输入流对象,用来接收客户端信息。
再定义一个getClientInfo()方法,用于接收客户端发送的信息。
对文本框添加一个事件:实现向客户端发磅信息。
创建一个客户端类:ClientSocketFrame,继承JFrame类。
写一个connect() 方法,实例化Socket对象,连接本地服务的9527端口服务。
再定义一个getClientInfo()方法,用于接收服务端发送的信息。
技术重点:
通过使用DataInputStream类的read0方法,将图片文件读取到字节数组,然后使用 DataOutputStream类从DataOutput类继承的write0方法输出字节数组,从而实现了使用Socket传输图片的功能。
三、代码详解
ServerSocketFrame
package com.xiaoxuzhu; import java.awt.BorderLayout; import java.awt.Dimension; import java.awt.FlowLayout; import java.awt.Graphics; import java.awt.GridLayout; import java.awt.Image; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.io.*; import java.net.*; import javax.imageio.ImageIO; import javax.swing.ImageIcon; import javax.swing.JButton; import javax.swing.JFileChooser; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.JTextField; import javax.swing.border.BevelBorder; import javax.swing.border.EtchedBorder; import javax.swing.filechooser.FileFilter; import javax.swing.filechooser.FileNameExtensionFilter; /** * Description: * * @author xiaoxuzhu * @version 1.0 * * <pre> * 修改记录: * 修改后版本 修改人 修改日期 修改内容 * 2022/6/4.1 xiaoxuzhu 2022/6/4 Create * </pre> * @date 2022/6/4 */ public class ServerSocketFrame extends JFrame { private Image sendImg = null; // 声明图像对象 private Image receiveImg = null; // 声明图像对象 private SendImagePanel sendImagePanel = null; // 声明图像面板对象 private ReceiveImagePanel receiveImagePanel = null; // 声明图像面板对象 private File imgFile = null;// 声明所选择图片的File对象 private JTextField tf_path; private DataOutputStream out = null; // 创建流对象 private DataInputStream in = null; // 创建流对象 private ServerSocket server; // 声明ServerSocket对象 private Socket socket; // 声明Socket对象socket private long lengths = -1; // 图片文件的大小 public void getServer() { try { server = new ServerSocket(9527); // 实例化Socket对象 while (true) { // 如果套接字是连接状态 socket = server.accept(); // 实例化Socket对象 out = new DataOutputStream(socket.getOutputStream());// 获得输出流对象 in = new DataInputStream(socket.getInputStream());// 获得输入流对象 getClientInfo(); // 调用getClientInfo()方法 } } catch (Exception e) { e.printStackTrace(); // 输出异常信息 } } private void getClientInfo() { try { long lengths = in.readLong();// 读取图片文件的长度 byte[] bt = new byte[(int) lengths];// 创建字节数组 for (int i = 0; i < bt.length; i++) { bt[i] = in.readByte();// 读取字节信息并存储到字节数组 } receiveImg = new ImageIcon(bt).getImage();// 创建图像对象 receiveImagePanel.repaint();// 重新绘制图像 } catch (Exception e) { } finally { try { if (in != null) { in.close();// 关闭流 } if (socket != null) { socket.close(); // 关闭套接字 } } catch (IOException e) { e.printStackTrace(); } } } public static void main(String[] args) { // 主方法 ServerSocketFrame frame = new ServerSocketFrame(); // 创建本类对象 frame.setVisible(true); frame.getServer(); // 调用方法 } public ServerSocketFrame() { super(); setTitle("服务器端程序"); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setBounds(100, 100, 379, 260); final JPanel panel = new JPanel(); getContentPane().add(panel, BorderLayout.NORTH); final JLabel label = new JLabel(); label.setText("路径:"); panel.add(label); tf_path = new JTextField(); tf_path.setPreferredSize(new Dimension(140, 25)); panel.add(tf_path); sendImagePanel = new SendImagePanel(); receiveImagePanel = new ReceiveImagePanel(); final JButton button_1 = new JButton(); button_1.addActionListener(new ActionListener() { public void actionPerformed(final ActionEvent e) { JFileChooser fileChooser = new JFileChooser();// 创建文件选择器 FileFilter filter = new FileNameExtensionFilter( "图像文件(JPG/GIF/BMP)", "JPG", "JPEG", "GIF", "BMP");// 创建过滤器 fileChooser.setFileFilter(filter);// 设置过滤器 int flag = fileChooser.showOpenDialog(null);// 显示打开对话框 if (flag == JFileChooser.APPROVE_OPTION) { imgFile = fileChooser.getSelectedFile(); // 获取选中图片的File对象 } if (imgFile != null) { tf_path.setText(imgFile.getAbsolutePath());// 图片完整路径 try { sendImg = ImageIO.read(imgFile);// 构造BufferedImage对象 } catch (IOException ex) { ex.printStackTrace(); } } sendImagePanel.repaint();// 调用paint()方法 } }); button_1.setText("选择图片"); panel.add(button_1); final JButton button = new JButton(); button.addActionListener(new ActionListener() { public void actionPerformed(final ActionEvent e) { try { DataInputStream inStream = null;// 定义数据输入流对象 if (imgFile != null) { lengths = imgFile.length();// 获得选择图片的大小 inStream = new DataInputStream(new FileInputStream(imgFile));// 创建输入流对象 } else { JOptionPane.showMessageDialog(null, "还没有选择图片文件。"); return; } out.writeLong(lengths);// 将文件的大小写入输出流 byte[] bt = new byte[(int) lengths];// 创建字节数组 int len = -1; while ((len = inStream.read(bt)) != -1) {// 将图片文件读取到字节数组 out.write(bt);// 将字节数组写入输出流 } } catch (IOException e1) { e1.printStackTrace(); } } }); button.setText("发 送"); panel.add(button); final JPanel panel_1 = new JPanel(); panel_1.setLayout(new BorderLayout()); getContentPane().add(panel_1, BorderLayout.CENTER); final JPanel panel_2 = new JPanel(); panel_2.setLayout(new GridLayout(1, 0)); final FlowLayout flowLayout = new FlowLayout(); flowLayout.setAlignment(FlowLayout.LEFT); panel_2.setLayout(flowLayout); panel_1.add(panel_2, BorderLayout.NORTH); final JLabel label_1 = new JLabel(); label_1.setBorder(new EtchedBorder(EtchedBorder.LOWERED)); label_1.setText("服务器端选择的要发送的图片 "); panel_2.add(label_1); final JLabel label_2 = new JLabel(); label_2.setBorder(new EtchedBorder(EtchedBorder.LOWERED)); label_2.setText("接收到客户端发送的图片 "); panel_2.add(label_2); final JPanel imgPanel = new JPanel(); final GridLayout gridLayout = new GridLayout(1, 0); gridLayout.setVgap(10); imgPanel.setLayout(gridLayout); panel_1.add(imgPanel, BorderLayout.CENTER); imgPanel.add(sendImagePanel); imgPanel.add(receiveImagePanel); sendImagePanel.setBorder(new BevelBorder(BevelBorder.LOWERED)); receiveImagePanel.setBorder(new BevelBorder(BevelBorder.LOWERED)); } // 创建面板类 class SendImagePanel extends JPanel { public void paint(Graphics g) { if (sendImg != null) { g.clearRect(0, 0, this.getWidth(), this.getHeight());// 清除绘图上下文的内容 g.drawImage(sendImg, 0, 0, this.getWidth(), this.getHeight(), this);// 绘制指定大小的图片 } } } // 创建面板类 class ReceiveImagePanel extends JPanel { public void paint(Graphics g) { if (receiveImg != null) { g.clearRect(0, 0, this.getWidth(), this.getHeight());// 清除绘图上下文的内容 g.drawImage(receiveImg, 0, 0, this.getWidth(), this.getHeight(), this);// 绘制指定大小的图片 } } } }
ClientSocketFrame
package com.xiaoxuzhu; import java.awt.BorderLayout; import java.awt.Container; import java.awt.Dimension; import java.awt.Graphics; import java.awt.GridLayout; import java.awt.Image; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.io.DataInputStream; import java.io.DataOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.net.Socket; import javax.imageio.ImageIO; import javax.swing.JButton; import javax.swing.ImageIcon; import javax.swing.JFileChooser; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.JTextField; import javax.swing.border.EtchedBorder; import javax.swing.filechooser.FileFilter; import javax.swing.filechooser.FileNameExtensionFilter; /** * Description: * * @author xiaoxuzhu * @version 1.0 * * <pre> * 修改记录: * 修改后版本 修改人 修改日期 修改内容 * 2022/6/4.1 xiaoxuzhu 2022/6/4 Create * </pre> * @date 2022/6/4 */ public class ClientSocketFrame extends JFrame { private Image sendImg = null; // 声明图像对象 private Image receiveImg = null; // 声明图像对象 private SendImagePanel sendImagePanel = null; // 声明图像面板对象 private ReceiveImagePanel receiveImagePanel = null; // 声明图像面板对象 private File imgFile = null;// 声明所选择图片的File对象 private JTextField tf_path; private DataInputStream in = null; // 创建流对象 private DataOutputStream out = null; // 创建流对象 private Socket socket; // 声明Socket对象 private Container cc; // 声明Container对象 private long lengths = -1;// 图片文件的大小 private void connect() { // 连接套接字方法 try { // 捕捉异常 socket = new Socket("127.0.0.1", 9527); // 实例化Socket对象 while (true) { if (socket != null && !socket.isClosed()) { out = new DataOutputStream(socket.getOutputStream());// 获得输出流对象 in = new DataInputStream(socket.getInputStream());// 获得输入流对象 getServerInfo();// 调用getServerInfo()方法 } else { socket = new Socket("127.0.0.1", 9527); // 实例化Socket对象 } } } catch (Exception e) { e.printStackTrace(); // 输出异常信息 } } public static void main(String[] args) { // 主方法 ClientSocketFrame clien = new ClientSocketFrame(); // 创建本例对象 clien.setVisible(true); // 将窗体显示 clien.connect(); // 调用连接方法 } private void getServerInfo() { try { long lengths = in.readLong();// 读取图片文件的长度 byte[] bt = new byte[(int) lengths];// 创建字节数组 for (int i = 0; i < bt.length; i++) { bt[i] = in.readByte();// 读取字节信息并存储到字节数组 } receiveImg = new ImageIcon(bt).getImage();// 创建图像对象 receiveImagePanel.repaint();// 重新绘制图像 } catch (Exception e) { } finally { try { if (in != null) { in.close();// 关闭流 } if (socket != null) { socket.close(); // 关闭套接字 } } catch (IOException e) { e.printStackTrace(); } } } /** * Create the frame */ public ClientSocketFrame() { super(); setTitle("客户端程序"); setBounds(100, 100, 373, 257); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); final JPanel panel = new JPanel(); getContentPane().add(panel, BorderLayout.NORTH); final JLabel label = new JLabel(); label.setText("路径:"); panel.add(label); tf_path = new JTextField(); tf_path.setPreferredSize(new Dimension(140, 25)); panel.add(tf_path); final JButton button = new JButton(); button.addActionListener(new ActionListener() { public void actionPerformed(final ActionEvent e) { JFileChooser fileChooser = new JFileChooser();// 创建文件选择器 FileFilter filter = new FileNameExtensionFilter( "图像文件(JPG/GIF/BMP)", "JPG", "JPEG", "GIF", "BMP");// 创建过滤器 fileChooser.setFileFilter(filter);// 设置过滤器 int flag = fileChooser.showOpenDialog(null);// 显示打开对话框 if (flag == JFileChooser.APPROVE_OPTION) { imgFile = fileChooser.getSelectedFile(); // 获取选中图片的File对象 } if (imgFile != null) { tf_path.setText(imgFile.getAbsolutePath());// 图片完整路径 try { sendImg = ImageIO.read(imgFile);// 构造BufferedImage对象 } catch (IOException ex) { ex.printStackTrace(); } } sendImagePanel.repaint();// 调用paint()方法 } }); button.setText("选择图片"); panel.add(button); final JButton button_1 = new JButton(); button_1.addActionListener(new ActionListener() { public void actionPerformed(final ActionEvent e) { try { DataInputStream inStream = null;// 定义数据输入流对象 if (imgFile != null) { lengths = imgFile.length();// 获得选择图片的大小 inStream = new DataInputStream(new FileInputStream( imgFile));// 创建输入流对象 } else { JOptionPane.showMessageDialog(null, "还没有选择图片文件。"); return; } out.writeLong(lengths);// 将文件的大小写入输出流 byte[] bt = new byte[(int) lengths];// 创建字节数组 int len = -1; while ((len = inStream.read(bt)) != -1) {// 将图片文件读取到字节数组 out.write(bt);// 将字节数组写入输出流 } } catch (IOException e1) { e1.printStackTrace(); } } }); button_1.setText("发 送"); panel.add(button_1); final JPanel panel_1 = new JPanel(); panel_1.setLayout(new BorderLayout()); getContentPane().add(panel_1, BorderLayout.CENTER); final JPanel panel_2 = new JPanel(); panel_2.setLayout(new GridLayout(1, 0)); panel_1.add(panel_2, BorderLayout.NORTH); final JLabel label_1 = new JLabel(); label_1.setBorder(new EtchedBorder(EtchedBorder.LOWERED)); label_1.setText("客户端选择的要发送的图片"); panel_2.add(label_1); final JLabel label_2 = new JLabel(); label_2.setBorder(new EtchedBorder(EtchedBorder.LOWERED)); label_2.setText("接收到服务器端发送的图片 "); panel_2.add(label_2); final JPanel imgPanel = new JPanel(); sendImagePanel = new SendImagePanel(); receiveImagePanel = new ReceiveImagePanel(); imgPanel.add(sendImagePanel); imgPanel.add(receiveImagePanel); final GridLayout gridLayout = new GridLayout(1, 0); gridLayout.setVgap(6); imgPanel.setLayout(gridLayout); panel_1.add(imgPanel, BorderLayout.CENTER); // } // 创建面板类 class SendImagePanel extends JPanel { public void paint(Graphics g) { if (sendImg != null) { g.clearRect(0, 0, this.getWidth(), this.getHeight());// 清除绘图上下文的内容 g.drawImage(sendImg, 0, 0, this.getWidth(), this.getHeight(), this);// 绘制指定大小的图片 } } } // 创建面板类 class ReceiveImagePanel extends JPanel { public void paint(Graphics g) { if (receiveImg != null) { g.clearRect(0, 0, this.getWidth(), this.getHeight());// 清除绘图上下文的内容 g.drawImage(receiveImg, 0, 0, this.getWidth(), this.getHeight(), this);// 绘制指定大小的图片 } } } }
服务器启动
客户端启动
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