DES加密解密（适用Windows和Linux系统）防止linux下解密失败

package com.lasun.util;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.InputStream;import java.io.OutputStream;import java.security.Key;import java.security.SecureRandom;import javax.crypto.Cipher;import javax.crypto.CipherInputStream;import javax.crypto.CipherOutputStream;import javax.crypto.KeyGenerator;import sun.misc.BASE64Decoder;import sun.misc.BASE64Encoder;import com.lasun.core.services.ParameterManager;public class DESUtil {    Key key;    public DESUtil() {    }    public DESUtil(String str) {        setKey(str); // 生成密匙    }    public Key getKey() {        return key;    }    public void setKey(Key key) {        this.key = key;    }    /**     * 根据参数生成 KEY      */    public void setKey (String strKey) {        try {            KeyGenerator _generator = KeyGenerator.getInstance("DES");            //防止linux下 随机生成key             SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG" );            secureRandom.setSeed(strKey.getBytes());                        _generator.init(56,secureRandom);            this.key = _generator.generateKey();            _generator = null;        } catch (Exception e) {            throw new RuntimeException(                    "Error initializing SqlMap class. Cause: " + e);        }    }    /**     * 根据参数生成 KEY          */    /*public void setKey(String strKey) {        try {            KeyGenerator _generator = KeyGenerator.getInstance("DES");            _generator.init(new SecureRandom(strKey.getBytes()));            this.key = _generator.generateKey();            _generator = null;        } catch (Exception e) {            throw new RuntimeException(                    "Error initializing SqlMap class. Cause: " + e);        }    }*/    /**     * 加密 String 明文输入 ,String 密文输出     */    public String encryptStr(String strMing) {        byte[] byteMi = null;        byte[] byteMing = null;        String strMi = "";        BASE64Encoder base64en = new BASE64Encoder();        try {            byteMing = strMing.getBytes("UTF8");            byteMi = this.encryptByte(byteMing);            strMi = base64en.encode(byteMi);        } catch (Exception e) {            throw new RuntimeException(                    "Error initializing SqlMap class. Cause: " + e);        } finally {            base64en = null;            byteMing = null;            byteMi = null;        }        return strMi;    }    /**     * 解密 以 String 密文输入 ,String 明文输出     *     * @param strMi     * @return     */    public String decryptStr(String strMi) {        BASE64Decoder base64De = new BASE64Decoder();        byte[] byteMing = null;        byte[] byteMi = null;        String strMing = "";        try {            byteMi = base64De.decodeBuffer(strMi);            byteMing = this.decryptByte(byteMi);            strMing = new String(byteMing, "UTF8");        } catch (Exception e) {            throw new RuntimeException(                    "Error initializing SqlMap class. Cause: " + e);        } finally {            base64De = null;            byteMing = null;            byteMi = null;        }        return strMing;    }    /**     * 加密以 byte[] 明文输入 ,byte[] 密文输出     *     * @param byteS     * @return     */    private byte[] encryptByte(byte[] byteS) {        byte[] byteFina = null;        Cipher cipher;        try {            cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");            cipher.init(Cipher.ENCRYPT_MODE, key);            byteFina = cipher.doFinal(byteS);        } catch (Exception e) {            throw new RuntimeException(                    "Error initializing SqlMap class. Cause: " + e);        } finally {            cipher = null;        }        return byteFina;    }    /**     * 解密以 byte[] 密文输入 , 以 byte[] 明文输出     *     * @param byteD     * @return     */    private byte[] decryptByte(byte[] byteD) {        Cipher cipher;        byte[] byteFina = null;        try {            cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");            cipher.init(Cipher.DECRYPT_MODE, key);            byteFina = cipher.doFinal(byteD);        } catch (Exception e) {            throw new RuntimeException(                    "Error initializing SqlMap class. Cause: " + e);        } finally {            cipher = null;        }        return byteFina;    }     public static void main(String[] args) throws Exception {        DESUtil des = new DESUtil("123456");        // DES 加密文件        // des.encryptFile("G:/test.doc", "G:/ 加密 test.doc");        // DES 解密文件        // des.decryptFile("G:/ 加密 test.doc", "G:/ 解密 test.doc");        String str1 = "jui8qayuh7yhqwsh";        // DES 加密字符串        String str2 = des.encryptStr(str1);        // DES 解密字符串        String deStr = des.decryptStr(str2);        System.out.println(" 加密前： " + str1);        System.out.println(" 加密后： " + str2);        System.out.println(" 加密后长度： " + str2.length());        System.out.println(" 解密后： " + deStr);    } }

说明：蓝色部分(注释掉的)代码 在windows下面好使，但是在linux下面会导致每次生成的key不一样、也就是说加密之后再解密就会保存，网上说由于两个操作系统处理补充字节默认补齐的方式不同,所以出现这样的情况；

      红色部分代码防止在linux下随机生成key，在两个操作系统下通用。