AES 解密后 进行ZIP解压还原问题

项目中 从webservice 得到了一串BASE64的码 是通过先通过ZIP压缩，然后AES加密，最后BASE64 形成的。


tn63IpL/zfnztSfQDON0GpQlGzMn+zy2RgxEm+XEUsqOuSB9bZJkaCI/YCkJY/j8pkfE/Gv0/cySYq1yf/rSjX8T04O04cBZgyAsmNcuMV7yQYMDgViHith6zYTd8H+C3PlFlyZCmjGXiBs8zdE1GYkuXvXm1GRTVieM0mkZVOImUVNoX5rK167Xmt9TfzG+Gpva1gbTkfqgsxvp1EKsVfZXe/9BE8BGuWqC3GiAOnW1Bcv9CMa3OFVkZ7qHyht6yrewn/tJgHKAKw3C/PTKMu/+Mh/9Pc8FjwpKOyb0Q+VEV+j2NLJaHnNEme+u7+gOs1mtSWd0IVBcXMo8h4Tszk7EbFi+NOkIZvNlxxnGL5Zh5/QUDaJtLCWwU4TBQ74IUNAvah2lRhToMU5ObTij/RwIAQIPYXmyOftn+G3CUGbIfCg5Dg+ibEblZj3j0fMTtKeZpIO6vJQezlHQqXj/8wljPqwrvhYdMxjmAGbkxxU=


就是上面这段。

然后我这边需要通过 AES 解密后 进行ZIP解压。还原出数据。

/ZIP解压

    public static final String unzip(String compressedStr) {

        if (compressedStr == null) {

            return null;

        }

          

        ByteArrayOutputStream out = null;

        ByteArrayInputStream in = null;

        ZipInputStream zin = null;

        String decompressed = null;

        try {

            //解开BASE64编码

            byte[] compressed = new sun.misc.BASE64Decoder()

                    .decodeBuffer(compressedStr);

             

            System.out.println(compressed);

            //解密

            KeyGenerator kgen = KeyGenerator.getInstance("AES");  

            kgen.init(128, new SecureRandom("QMQWLBKK64WUS1W6".getBytes()));  

            SecretKey secretKey = kgen.generateKey();  

            byte[] enCodeFormat = secretKey.getEncoded();  

            SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");  

            Cipher cipher = Cipher.getInstance("AES/ECB/NoPadding");// 创建密码器  

            cipher.init(Cipher.DECRYPT_MODE, key);

            byte[] result = cipher.doFinal(compressed);  

            //解密结束

             

             

            out = new ByteArrayOutputStream();

            in = new ByteArrayInputStream(result);

            zin = new ZipInputStream(in);

            while(zin.getNextEntry() != null){

                byte[] buffer = new byte[result.length];

                int offset = -1;

                while ((offset = zin.read(buffer,0,buffer.length)) != -1) {

                    out.write(buffer, 0, offset);

                }

            }

             

            decompressed = out.toString();

        } catch (Exception e) {

            e.printStackTrace();

            decompressed = null;

        } finally {

            if (zin != null) {

                try {

                    zin.close();

                } catch (IOException e) {

                }

            }

            if (in != null) {

                try {

                    in.close();

                } catch (IOException e) {

                }

            }

            if (out != null) {

                try {

                    out.close();

                } catch (IOException e) {

                }

            }

        }

        return decompressed;

    }

这是解密 解压的代码，但是结果是什么都解压不出来，百度 GOOGLE 翻了一大堆，还是不行。想问哪位大神写过相关代码，
帮看看这段代码 问题在哪？谢谢了。