package com.mstf.des; import java.io.UnsupportedEncodingException; /** * base64编码/解码 * @author ceet * */public class Base64 { 	public static String encode(String data) {		return new String(encode(data.getBytes()));	} 	public static String decode(String data) {		try {			return new String(decode(data.toCharArray()),"utf-8");		} catch (UnsupportedEncodingException e) {			e.printStackTrace();			return null;		}		} 	private static char[] alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="			.toCharArray(); 	private static 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;	} 	public static char[] 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 out;	} 	public static byte[] decode(char[] data) {		int tempLen = data.length;		for (int ix = 0; ix < data.length; ix++) {			if ((data[ix] > 255) || codes[data[ix]] < 0) {				--tempLen;			}		}		int len = (tempLen / 4) * 3;		if ((tempLen % 4) == 3) {			len += 2;		}		if ((tempLen % 4) == 2) {			len += 1; 		}		byte[] out = new byte[len]; 		int shift = 0;		int accum = 0;		int index = 0; 		for (int ix = 0; ix < data.length; ix++) {			int value = http://www.mamicode.com/(data[ix] > 255) ? -1 : codes[data[ix]];"Miscalculated data length (wrote " + index					+ " instead of " + out.length + ")");		} 		return out;	}}

package com.mstf.des; import java.security.Key;import java.security.SecureRandom; import javax.crypto.Cipher;import javax.crypto.KeyGenerator; /** * DES对称算法(加密/解密) *  * @author ceet * */public class DESUtil { 	private Key key; 	public DESUtil(String strKey) {		setKey(strKey);	} 	public void setKey(String strKey) {		try {			KeyGenerator generator = KeyGenerator.getInstance("DES");			generator.init(new SecureRandom(strKey.getBytes())); // 根据参数生成key			this.key = generator.generateKey();		} catch (Exception e) {			e.printStackTrace();		}	} 	public String encrypt(String source) {		return encrypt(source, "utf-8");	} 	public String decrypt(String encryptedData) {		return decrypt(encryptedData, "utf-8");	} 	public String encrypt(String source, String charSet) {		String encrypt = null;		try {			byte[] ret = encrypt(source.getBytes(charSet));			encrypt = new String(Base64.encode(ret));		} catch (Exception e) {			e.printStackTrace();			encrypt = null;		}		return encrypt;	} 	public String decrypt(String encryptedData, String charSet) {		String descryptedData = http://www.mamicode.com/null;"DES"); // Cipher对象实际完成加密操作			cipher.init(Cipher.ENCRYPT_MODE, this.key); // 用密钥初始化Cipher对象(加密) 			return cipher.doFinal(primaryData);		} catch (Exception e) {			e.printStackTrace();			return null;		}	} 	private byte[] descrypt(byte[] encryptedData) {		try {			Cipher cipher = Cipher.getInstance("DES"); // Cipher对象实际完成解密操作			cipher.init(Cipher.DECRYPT_MODE, this.key); // 用密钥初始化Cipher对象(解密) 			return cipher.doFinal(encryptedData);		} catch (Exception e) {			e.printStackTrace();			return null;		}	} 	public static void main(String[] args) {		String code = "ceet";		DESUtil desUtil = new DESUtil("key");		String encrypt = desUtil.encrypt(code);		String decrypt = desUtil.decrypt(encrypt);		System.out.println("原内容：" + code);		System.out.println("加密：" + encrypt);		System.out.println("解密：" + decrypt);	}}