commit

.gitignore

+# IntelliJ IDEA
+.idea
+*.iml
+target
+classes
+
+# Eclipse
+*.metadata
+*.settings
+.project
+.classpath

javaUtil/pom.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>com.example.common.util</groupId>
+    <artifactId>javaUtil</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <dependencies>
+
+    </dependencies>
+
+
+</project>
\ No newline at end of file

javaUtil/src/main/java/com/example/common/util/encrypt/DESUtils.java

+package com.example.common.util.encrypt;
+
+import javax.crypto.*;
+import javax.crypto.spec.DESKeySpec;
+import java.security.InvalidKeyException;
+import java.security.NoSuchAlgorithmException;
+import java.security.spec.InvalidKeySpecException;
+
+/**
+ * <pre>
+ *
+ * </pre>
+ *
+ * <pre>
+ * @author mazq
+ * 修改记录
+ *    修改后版本:     修改人：  修改日期: 2020/09/07 18:39  修改内容:
+ * </pre>
+ */
+public class DESUtils {
+    private static final String DES_ALGORITHM = "DES";
+
+    /**
+     * DES加密
+     *
+     * @param plainData 原始字符串
+     * @param secretKey 加密密钥
+     * @return 加密后的字符串
+     * @throws Exception
+     */
+    public static String encryption(String plainData, String secretKey) throws Exception {
+
+        Cipher cipher = null;
+        try {
+            cipher = Cipher.getInstance(DES_ALGORITHM);
+            cipher.init(Cipher.ENCRYPT_MODE, generateKey(secretKey));
+
+        } catch (NoSuchAlgorithmException e) {
+            e.printStackTrace();
+        } catch (NoSuchPaddingException e) {
+            e.printStackTrace();
+        } catch (InvalidKeyException e) {
+
+        }
+
+        try {
+            // 为了防止解密时报javax.crypto.IllegalBlockSizeException: Input length must
+            // be multiple of 8 when decrypting with padded cipher异常，
+            // 不能把加密后的字节数组直接转换成字符串
+            byte[] buf = cipher.doFinal(plainData.getBytes());
+
+            return Base64Utils.encode(buf);
+
+        } catch (IllegalBlockSizeException e) {
+            e.printStackTrace();
+            throw new Exception("IllegalBlockSizeException", e);
+        } catch (BadPaddingException e) {
+            e.printStackTrace();
+            throw new Exception("BadPaddingException", e);
+        }
+
+    }
+
+
+    /**
+     * DES解密
+     * @param secretData 密码字符串
+     * @param secretKey 解密密钥
+     * @return 原始字符串
+     * @throws Exception
+     */
+    public static String decryption(String secretData, String secretKey) throws Exception {
+
+        Cipher cipher = null;
+        try {
+            cipher = Cipher.getInstance(DES_ALGORITHM);
+            cipher.init(Cipher.DECRYPT_MODE, generateKey(secretKey));
+
+        } catch (NoSuchAlgorithmException e) {
+            e.printStackTrace();
+            throw new Exception("NoSuchAlgorithmException", e);
+        } catch (NoSuchPaddingException e) {
+            e.printStackTrace();
+            throw new Exception("NoSuchPaddingException", e);
+        } catch (InvalidKeyException e) {
+            e.printStackTrace();
+            throw new Exception("InvalidKeyException", e);
+        }
+
+        try {
+
+            byte[] buf = cipher.doFinal(Base64Utils.decode(secretData.toCharArray()));
+
+            return new String(buf);
+
+        } catch (IllegalBlockSizeException e) {
+            e.printStackTrace();
+            throw new Exception("IllegalBlockSizeException", e);
+        } catch (BadPaddingException e) {
+            e.printStackTrace();
+            throw new Exception("BadPaddingException", e);
+        }
+    }
+
+    /**
+     * 获得秘密密钥
+     *
+     * @param secretKey
+     * @return
+     * @throws NoSuchAlgorithmException
+     * @throws InvalidKeySpecException
+     * @throws InvalidKeyException
+     */
+    private static SecretKey generateKey(String secretKey)
+            throws NoSuchAlgorithmException, InvalidKeySpecException, InvalidKeyException {
+        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES_ALGORITHM);
+        DESKeySpec keySpec = new DESKeySpec(secretKey.getBytes());
+        keyFactory.generateSecret(keySpec);
+        return keyFactory.generateSecret(keySpec);
+    }
+
+    static private class Base64Utils {
+
+        static private char[] alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="
+                .toCharArray();
+        static private byte[] codes = new byte[256];
+
+        static {
+            for (int i = 0; i < 256; i++)
+                codes[i] = -1;
+            for (int i = 'A'; i <= 'Z'; i++)
+                codes[i] = (byte) (i - 'A');
+            for (int i = 'a'; i <= 'z'; i++)
+                codes[i] = (byte) (26 + i - 'a');
+            for (int i = '0'; i <= '9'; i++)
+                codes[i] = (byte) (52 + i - '0');
+            codes['+'] = 62;
+            codes['/'] = 63;
+        }
+
+        /**
+         * 将原始数据编码为base64编码
+         */
+        static private String encode(byte[] data) {
+            char[] out = new char[((data.length + 2) / 3) * 4];
+            for (int i = 0, index = 0; i < data.length; i += 3, index += 4) {
+                boolean quad = false;
+                boolean trip = false;
+                int val = (0xFF & (int) data[i]);
+                val <<= 8;
+                if ((i + 1) < data.length) {
+                    val |= (0xFF & (int) data[i + 1]);
+                    trip = true;
+                }
+                val <<= 8;
+                if ((i + 2) < data.length) {
+                    val |= (0xFF & (int) data[i + 2]);
+                    quad = true;
+                }
+                out[index + 3] = alphabet[(quad ? (val & 0x3F) : 64)];
+                val >>= 6;
+                out[index + 2] = alphabet[(trip ? (val & 0x3F) : 64)];
+                val >>= 6;
+                out[index + 1] = alphabet[val & 0x3F];
+                val >>= 6;
+                out[index + 0] = alphabet[val & 0x3F];
+            }
+
+            return new String(out);
+        }
+
+        /**
+         * 将base64编码的数据解码成原始数据
+         */
+        static private byte[] decode(char[] data) {
+            int len = ((data.length + 3) / 4) * 3;
+            if (data.length > 0 && data[data.length - 1] == '=')
+                --len;
+            if (data.length > 1 && data[data.length - 2] == '=')
+                --len;
+            byte[] out = new byte[len];
+            int shift = 0;
+            int accum = 0;
+            int index = 0;
+            for (int ix = 0; ix < data.length; ix++) {
+                int value = codes[data[ix] & 0xFF];
+                if (value >= 0) {
+                    accum <<= 6;
+                    shift += 6;
+                    accum |= value;
+                    if (shift >= 8) {
+                        shift -= 8;
+                        out[index++] = (byte) ((accum >> shift) & 0xff);
+                    }
+                }
+            }
+            if (index != out.length)
+                throw new Error("miscalculated data length!");
+            return out;
+        }
+    }
+}