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*加密过程中，每一*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 + "\r\n");

            }

            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。