Java AES加密解密工具 -- GUI 、在线传输文件

原理

对于任意长度的明文，AES首先对其进行分组，每组的长度为128位。分组之后将分别对每个128位的明文分组进行加密。

对于每个128位长度的明文分组的加密过程如下：

（1）将128位AES明文分组放入状态矩阵中。

（2）AddRoundKey变换：对状态矩阵进行AddRoundKey变换，与膨胀后的密钥进行异或操作（密钥膨胀将在实验原理七中详细讨论）。

（3）10轮循环：AES对状态矩阵进行了10轮类似的子加密过程。前9轮子加密过程中，每一轮子加密过程包括4种不同的变换，而最后一轮只有3种变换，前9轮的子加密步骤如下：

• ● SubBytes变换：SubBytes变换是一个对状态矩阵非线性的变换；
• ● ShiftRows变换：ShiftRows变换对状态矩阵的行进行循环移位；
• ● MixColumns变换：MixColumns变换对状态矩阵的列进行变换；
• ● AddRoundKey变换：AddRoundKey变换对状态矩阵和膨胀后的密钥进行异或操作。

最后一轮的子加密步骤如下：

• ● SubBytes变换：SubBytes变换是一个对状态矩阵非线性的变换；
• ● ShiftRows变换：ShiftRows变换对状态矩阵的行进行循环移位；
• ● AddRoundKey变换：AddRoundKey变换对状态矩阵和膨胀后的密钥进行异或操作；

（4）经过10轮循环的状态矩阵中的内容就是加密后的密文。

步骤

主要用到的java类有：

• 类 Cipher
  java.lang.Object
  javax.crypto.Cipher，主要提供加密解密功能

• 类 KeyGenerator
  java.lang.Object
  javax.crypto.KeyGenerator，此类提供（对称）密钥生成器的功能。

• 接口 SecretKey
  所有超级接口：
  Key, Serializable
  所有已知子接口：
  PBEKey
  所有已知实现类：
  KerberosKey, SecretKeySpec

加密步骤

1. 构造密钥生成器，指定为AES算法，不区分大小写
2. 根据ecnodeRules规则初始化密钥生成器
   生成一个128位的随机源,根据传入的字节数组
3. 产生原始对称密钥
4. 获得原始对称密钥的字节数组
5. 根据字节数组生成AES密钥
6. 根据指定算法AES自成密码器
7. 初始化密码器，第一个参数为加密(Encrypt_mode)或者解密解密(Decrypt_mode)操作，第二个参数为使用的KEY
8. 获取加密内容的字节数组(这里要设置为utf-8)不然内容中如果有中文和英文混合中文就会解密为乱码
9. 根据密码器的初始化方式--加密：将数据加密
10. 将加密后的数据转换为字符串
    这里用Base64Encoder中会找不到包
    解决办法：
    在项目的Build path中先移除JRE System Library，再添加库JRE System Library，重新编译后就一切正常了。
11. 将字符串返回

效果演示及代码

效果图

代码

AesJM.java

package AesMmx;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

public class AesJM {

    public static String MmxEncode(String theKey, String theText) {
        try {
            KeyGenerator k = KeyGenerator.getInstance("AES");//密钥生成器
            k.init(128, new SecureRandom(theKey.getBytes()));//初始化128位生成器
            SecretKey ori_key = k.generateKey();//产生密钥
            byte[] sz = ori_key.getEncoded();//密钥转为二进制数组
            SecretKey key = new SecretKeySpec(sz, "AES");//转为AES密钥
            Cipher c = Cipher.getInstance("AES");//定义AES密码器
            c.init(Cipher.ENCRYPT_MODE, key);//传入密码初始化密码器
            byte[] content_b = theText.getBytes("utf-8");//获取文本的utf-8二进制数组
            byte[] miwen_b = c.doFinal(content_b);//加密
            String miwen = new String(new BASE64Encoder().encode(miwen_b));//加密后的二进制转为String
            return miwen;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }


    public static String MmxDncode(String theKey, String theText) throws UnsupportedEncodingException, IOException {
        try {
            KeyGenerator k = KeyGenerator.getInstance("AES");
            k.init(128, new SecureRandom(theKey.getBytes()));
            SecretKey ori_key = k.generateKey();
            byte[] sz = ori_key.getEncoded();
            SecretKey key = new SecretKeySpec(sz, "AES");
            Cipher c = Cipher.getInstance("AES");
            c.init(Cipher.DECRYPT_MODE, key);
            byte[] content_b = new BASE64Decoder().decodeBuffer(theText);
            byte[] mingwen_b = c.doFinal(content_b);//解密
            String mingwen = new String(mingwen_b, "utf-8");
            return mingwen;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

}

Net.java

package AesMmx;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Date;
import java.util.logging.Level;
import java.util.logging.Logger;

public class Net {
//网络功能，实现互相传数据功能
    private static int po = 6666;
//默认端口号
    public static void setPo(int port) {    //设置端口号
        po = port;
    }

    public static void ListenNet() throws IOException {     //监听端口功能，接受数据
        while (true) {
            ServerSocket serverSocket = new ServerSocket(po);   //创建服务器socket
            Socket socket = serverSocket.accept();      //监听端口
            InputStream is = socket.getInputStream();   
            InputStreamReader isr = new InputStreamReader(is);
            BufferedReader br = new BufferedReader(isr);        //输入流
            String info = null;
            Date time = new Date();     
            String theTime = "" + time.getTime();   //获取时间戳
            File file = new File(theTime + ".txt");
            System.out.println(theTime + ".txt");       //收到的信息保存到文件
            BufferedWriter bufw = new BufferedWriter(new FileWriter(file));
            while ((info = br.readLine()) != null) {
                bufw.write(info);
                System.out.println("客户端消息" + info);
            }
            socket.shutdownInput();
            bufw.close();
            br.close();
            isr.close();
            is.close();
            socket.close();
            serverSocket.close();
        }
    }

    public static void send(String ip, int ipport, String str) throws IOException {
        Socket socket = new Socket(ip, ipport);     //创建socket  
        OutputStream os = socket.getOutputStream();     
        PrintWriter pw = new PrintWriter(os);       //输出流
        pw.write(str);      //将数据写出
        pw.flush();
        socket.shutdownOutput();
        pw.close();
        os.close();
        socket.close();
    }

    public void run(int port) {
        while (true) {
            try {
                ListenNet();        //一直监听
            } catch (IOException ex) {
                Logger.getLogger(Net.class.getName()).log(Level.SEVERE, null, ex);
            }
        }
    }
}

GUI主要组件：

        jPanel1 = new javax.swing.JPanel();
        jPanel2 = new javax.swing.JPanel();
        jLabel2 = new javax.swing.JLabel();
        dstIP = new javax.swing.JTextField();       //目的IP框
        dstPort = new javax.swing.JTextField();     //目的IP端口框
        send = new javax.swing.JButton();       //发送按钮
        jLabel3 = new javax.swing.JLabel();
        lisPort = new javax.swing.JTextField();     //监听端口框
        listen = new javax.swing.JButton();     //监听按钮
        jPanel3 = new javax.swing.JPanel();
        miyue = new javax.swing.JPasswordField();   //密码框
        jLabel1 = new javax.swing.JLabel();
        jSeparator1 = new javax.swing.JSeparator();
        jScrollPane1 = new javax.swing.JScrollPane();
        content = new javax.swing.JTextArea();      //文本框
        jSeparator2 = new javax.swing.JSeparator();
        jPanel4 = new javax.swing.JPanel();
        jButton1 = new javax.swing.JButton();
        jButton2 = new javax.swing.JButton();
        menulist = new javax.swing.JMenuBar();      //菜单栏
        jMenu3 = new javax.swing.JMenu();       //文件按钮
        open = new javax.swing.JMenuItem();     //打开文件
        save = new javax.swing.JMenuItem();     //保存文件
        keyMenu = new javax.swing.JMenu();      //密码按钮
        openKey = new javax.swing.JMenuItem();  //打开密码  
        saveKey = new javax.swing.JMenuItem();  //保存密码

MmxGui.java

package AesMmx;

import java.awt.FileDialog;
import java.awt.Frame;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;

public class MmxGui extends javax.swing.JFrame {
//图形界面
    private Frame f;	//窗体
    private File file;		//windows文件


    public MmxGui() {
        initComponents(); 	//初始化
    }


                         
    private void initComponents() {

        jPanel1 = new javax.swing.JPanel();
        jPanel2 = new javax.swing.JPanel();
        jLabel2 = new javax.swing.JLabel();
        dstIP = new javax.swing.JTextField();		//目的IP框
        dstPort = new javax.swing.JTextField();		//目的IP端口框
        send = new javax.swing.JButton();		//发送按钮
        jLabel3 = new javax.swing.JLabel();
        lisPort = new javax.swing.JTextField();		//监听端口框
        listen = new javax.swing.JButton();		//监听按钮
        jPanel3 = new javax.swing.JPanel();
        miyue = new javax.swing.JPasswordField();	//密码框
        jLabel1 = new javax.swing.JLabel();
        jSeparator1 = new javax.swing.JSeparator();
        jScrollPane1 = new javax.swing.JScrollPane();
        content = new javax.swing.JTextArea();		//文本框
        jSeparator2 = new javax.swing.JSeparator();
        jPanel4 = new javax.swing.JPanel();
        jButton1 = new javax.swing.JButton();
        jButton2 = new javax.swing.JButton();
        menulist = new javax.swing.JMenuBar();		//菜单栏
        jMenu3 = new javax.swing.JMenu();		//文件按钮
        open = new javax.swing.JMenuItem();		//打开文件
        save = new javax.swing.JMenuItem();		//保存文件
        keyMenu = new javax.swing.JMenu();		//密码按钮
        openKey = new javax.swing.JMenuItem();	//打开密码	
        saveKey = new javax.swing.JMenuItem();	//保存密码

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
		setTitle("AES加密解密-CJB");
		
        jPanel2.setBorder(javax.swing.BorderFactory.createEtchedBorder());

        jLabel2.setFont(new java.awt.Font("等线 Light", 0, 24)); 
        jLabel2.setText("目的IP");
        jPanel2.add(jLabel2);

        dstIP.setFont(new java.awt.Font("等线 Light", 0, 24)); 
        dstIP.setText("127.0.0.1");
        dstIP.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                dstIPActionPerformed(evt);
            }
        });
        jPanel2.add(dstIP);

        dstPort.setFont(new java.awt.Font("等线 Light", 0, 24)); 
        dstPort.setText("6666");
        jPanel2.add(dstPort);

        send.setFont(new java.awt.Font("等线 Light", 0, 24)); 
        send.setText("发送");
        send.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                sendActionPerformed(evt);
            }
        });
        jPanel2.add(send);

        jLabel3.setFont(new java.awt.Font("等线 Light", 0, 24)); 
        jLabel3.setText("监听端口");
        jPanel2.add(jLabel3);

        lisPort.setFont(new java.awt.Font("等线 Light", 0, 24)); 
        lisPort.setText("6666");
        jPanel2.add(lisPort);

        listen.setFont(new java.awt.Font("等线 Light", 0, 24)); 
        listen.setText("开启监听");
        listen.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                listenActionPerformed(evt);
            }
        });
        jPanel2.add(listen);

        jPanel3.setBorder(javax.swing.BorderFactory.createEtchedBorder());

        miyue.setFont(new java.awt.Font("等线 Light", 0, 24)); 
        miyue.addKeyListener(new java.awt.event.KeyAdapter() {
            public void keyPressed(java.awt.event.KeyEvent evt) {
                miyueKeyPressed(evt);
            }
        });

        jLabel1.setFont(new java.awt.Font("等线 Light", 0, 24)); 
        jLabel1.setText("密码");

        content.setColumns(20);
        content.setRows(5);
        jScrollPane1.setViewportView(content);

        jPanel4.setBorder(javax.swing.BorderFactory.createEtchedBorder());

        jButton1.setFont(new java.awt.Font("等线 Light", 0, 24)); 
        jButton1.setText("加密");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });
        jPanel4.add(jButton1);

        jButton2.setFont(new java.awt.Font("等线 Light", 0, 24)); 
        jButton2.setText("解密");
        jButton2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton2ActionPerformed(evt);
            }
        });
        jPanel4.add(jButton2);

        javax.swing.GroupLayout jPanel3Layout = new javax.swing.GroupLayout(jPanel3);
        jPanel3.setLayout(jPanel3Layout);
        jPanel3Layout.setHorizontalGroup(
            jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel3Layout.createSequentialGroup()
                .addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel3Layout.createSequentialGroup()
                        .addContainerGap()
                        .addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                            .addComponent(jSeparator1)
                            .addGroup(jPanel3Layout.createSequentialGroup()
                                .addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 115, javax.swing.GroupLayout.PREFERRED_SIZE)
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                                .addComponent(miyue))))
                    .addGroup(jPanel3Layout.createSequentialGroup()
                        .addGap(128, 128, 128)
                        .addComponent(jScrollPane1))
                    .addGroup(jPanel3Layout.createSequentialGroup()
                        .addContainerGap()
                        .addComponent(jSeparator2))
                    .addGroup(jPanel3Layout.createSequentialGroup()
                        .addContainerGap()
                        .addComponent(jPanel4, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)))
                .addContainerGap())
        );
        jPanel3Layout.setVerticalGroup(
            jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel3Layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(miyue, javax.swing.GroupLayout.PREFERRED_SIZE, 42, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 42, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(jSeparator1, javax.swing.GroupLayout.PREFERRED_SIZE, 10, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 162, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(jSeparator2, javax.swing.GroupLayout.PREFERRED_SIZE, 10, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(jPanel4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(14, Short.MAX_VALUE))
        );

        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                    .addComponent(jPanel3, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addComponent(jPanel2, javax.swing.GroupLayout.DEFAULT_SIZE, 637, Short.MAX_VALUE))
                .addContainerGap())
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(jPanel3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );

        getContentPane().add(jPanel1, java.awt.BorderLayout.CENTER);

        jMenu3.setText("文件");

        open.setText("打开");
        open.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                openActionPerformed(evt);
            }
        });
        jMenu3.add(open);

        save.setText("保存");
        save.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                saveActionPerformed(evt);
            }
        });
        jMenu3.add(save);

        menulist.add(jMenu3);

        keyMenu.setText("密码");

        openKey.setText("导入");
        openKey.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                openKeyActionPerformed(evt);
            }
        });
        keyMenu.add(openKey);

        saveKey.setText("导出");
        saveKey.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                saveKeyActionPerformed(evt);
            }
        });
        keyMenu.add(saveKey);

        menulist.add(keyMenu);

        setJMenuBar(menulist);

        pack();
    }            

    private void dstIPActionPerformed(java.awt.event.ActionEvent evt) {                                      
        
    }                                     

    private void openActionPerformed(java.awt.event.ActionEvent evt) {                                     
        
        f = new Frame("文件浏览");
        f.setBounds(300, 100, 650, 600);
        openDia = new FileDialog(f, "打开", FileDialog.LOAD);

        openDia.setVisible(true);

        String dirpath = openDia.getDirectory();
        String fileName = openDia.getFile();

        if (dirpath == null || fileName == null)
        {
            return;
        } else {
            content.setText(null);
        }
        File file = new File(dirpath, fileName);

        try {
            BufferedReader bufr = new BufferedReader(new FileReader(file));
            String line = null;
            while ((line = bufr.readLine()) != null) {
                content.append(line + "
");
            }
            bufr.close();
        } catch (FileNotFoundException e1) {
            
            e1.printStackTrace();
        } catch (IOException e1) {
            
            e1.printStackTrace();
        }
    }                                    

    private void sendActionPerformed(java.awt.event.ActionEvent evt) {                                     
        try {
            
            Net.send(dstIP.getText(), Integer.parseInt(dstPort.getText()), content.getText());
        } catch (IOException ex) {
            Logger.getLogger(MmxGui.class.getName()).log(Level.SEVERE, null, ex);
        }
    }                                    

    private void listenActionPerformed(java.awt.event.ActionEvent evt) {                                       
        
        Net.setPo(Integer.parseInt(lisPort.getText()));
        Runnable r = () -> {
            try {
                Net.ListenNet();
            } catch (IOException ex) {
                Logger.getLogger(MmxGui.class.getName()).log(Level.SEVERE, null, ex);
            }
        };
        new Thread(r).start();
    }                            
    
    @SuppressWarnings("deprecation")
	private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        
        content.setText(AesJM.MmxEncode(miyue.getText(), content.getText()));
    }                                        

    @SuppressWarnings("deprecation")
	private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        try {
            
            content.setText(AesJM.MmxDncode(miyue.getText(), content.getText()));
        } catch (IOException ex) {
            Logger.getLogger(MmxGui.class.getName()).log(Level.SEVERE, null, ex);
        }
    }                                        

    private void saveActionPerformed(java.awt.event.ActionEvent evt) {                                     
        
        saveDia = new FileDialog(f, "保存", FileDialog.SAVE);
        if (file == null) {
            saveDia.setVisible(true);
            String dirpath = saveDia.getDirectory();
            String fileName = saveDia.getFile();

            if (dirpath == null || fileName == null)
            {
                return;
            } else {
                file = new File(dirpath, fileName);
            }
        }
        try {
            BufferedWriter bufw = new BufferedWriter(new FileWriter(file));

            String text = content.getText();
            bufw.write(text);

            bufw.close();
        } catch (IOException e1) {
            
            e1.printStackTrace();
        }
    }                                    

    private void miyueKeyPressed(java.awt.event.KeyEvent evt) {                                 
        
    }                                

    private void openKeyActionPerformed(java.awt.event.ActionEvent evt) {                                        
        
        f = new Frame("密码浏览");
        f.setBounds(300, 100, 650, 600);
        openDia = new FileDialog(f, "打开", FileDialog.LOAD);

        openDia.setVisible(true);

        String dirpath = openDia.getDirectory();
        String fileName = openDia.getFile();
        if (dirpath == null || fileName == null)
        {
            return;
        } else {
            miyue.setText(null);
        }
        File file = new File(dirpath, fileName);

        try {
            BufferedReader bufr = new BufferedReader(new FileReader(file));
            String line = null;
            while ((line = bufr.readLine()) != null) {
                miyue.setText(line);
            }
            bufr.close();
        } catch (FileNotFoundException e1) {
           
            e1.printStackTrace();
        } catch (IOException e1) {
         
            e1.printStackTrace();
        }
    }                                       
    
    @SuppressWarnings("deprecation")
	private void saveKeyActionPerformed(java.awt.event.ActionEvent evt) {                                        
     
        saveDia = new FileDialog(f, "保存", FileDialog.SAVE);
        if (file == null) {
            saveDia.setVisible(true);
            String dirpath = saveDia.getDirectory();
            String fileName = saveDia.getFile();

            if (dirpath == null || fileName == null)
            {
                return;
            } else {
                file = new File(dirpath, fileName);
            }
        }
        try {
            BufferedWriter bufw = new BufferedWriter(new FileWriter(file));

            String text = miyue.getText();
            bufw.write(text);

            bufw.close();
        } catch (IOException e1) {
           
            e1.printStackTrace();
        }
    }                                       


    public static void main(String args[]) {

        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(MmxGui.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(MmxGui.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(MmxGui.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(MmxGui.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }

        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new MmxGui().setVisible(true);
            }
        });
    }
    private FileDialog openDia, saveDia;    //windows文件
                   
    private javax.swing.JTextArea content;
    private javax.swing.JTextField dstIP;
    private javax.swing.JTextField dstPort;
    private javax.swing.JButton jButton1;
    private javax.swing.JButton jButton2;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JMenu jMenu3;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JPanel jPanel2;
    private javax.swing.JPanel jPanel3;
    private javax.swing.JPanel jPanel4;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JSeparator jSeparator1;
    private javax.swing.JSeparator jSeparator2;
    private javax.swing.JMenu keyMenu;
    private javax.swing.JTextField lisPort;
    private javax.swing.JButton listen;
    private javax.swing.JMenuBar menulist;
    private javax.swing.JPasswordField miyue;
    private javax.swing.JMenuItem open;
    private javax.swing.JMenuItem openKey;
    private javax.swing.JMenuItem save;
    private javax.swing.JMenuItem saveKey;
    private javax.swing.JButton send;
                 
}

小结（2018.6）

这次实验需要完成：图形界面、打开保存文件、网络传输、AES加密解密。其中，最难的部分是AES加密解密算法的实现，需要我们参考Java文档，查询相关加密、解密内容，同时需要我们合理的应用内置类实现加密解密功能。打开、保存文件是另外一个难点。我查阅相关资料，主要是用如下图实现：

保存和打开文件的过程我是使用字符打开，未实现用二进制保存和打开，且部分格式保存会使其成为无效文件。网络功能主要是应用服务器socket和客户端socket实现。用多线程开启服务器监听，当需要发送信息时创建客户端socket进行通信。GUI部分，因为是用netbeans工具，隐藏隐秘信息的文本框利用如下对象实现：

经过这次实验，我对密码学中的加密、解密原理有更深的认识和研究，也体会到密码学与现实生活的结合、应用。