Android gzip、base64 加密、解密

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import java.io.ByteArrayInputStream;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.UnsupportedEncodingException;import java.util.zip.GZIPInputStream;import java.util.zip.GZIPOutputStream;import android.util.Base64;public class EncryptUtil {private static final int BUFFER_SIZE = 1024;/** * BASE64 加密 * @param str * @return */public static  String encryptBASE64(String str) {if (str == null || str.length() == 0) {return null;}try {byte[] encode = str.getBytes("UTF-8");// base64 加密return new String(Base64.encode(encode, 0, encode.length, Base64.DEFAULT), "UTF-8");} catch (UnsupportedEncodingException e) {e.printStackTrace();}return null;}/** * BASE64 解密 * @param str * @return */public static  String decryptBASE64(String str) {if (str == null || str.length() == 0) {return null;}try {byte[] encode = str.getBytes("UTF-8");// base64 解密return new String(Base64.decode(encode, 0, encode.length, Base64.DEFAULT), "UTF-8");} catch (UnsupportedEncodingException e) {e.printStackTrace();}return null;}/** * GZIP 加密 *  * @param str * @return */public static  byte[] encryptGZIP(String str) {if (str == null || str.length() == 0) {return null;}try {// gzip压缩ByteArrayOutputStream baos = new ByteArrayOutputStream();GZIPOutputStream gzip = new GZIPOutputStream(baos);gzip.write(str.getBytes("UTF-8"));gzip.close();byte[] encode = baos.toByteArray();baos.flush();baos.close();// base64 加密return encode;//return new String(encode, "UTF-8");} catch (UnsupportedEncodingException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}return null;}/** * GZIP 解密 *  * @param str * @return */public static  String decryptGZIP(String str) {if (str == null || str.length() == 0) {return null;}try {byte[] decode = str.getBytes("UTF-8");//gzip 解压缩ByteArrayInputStream bais = new ByteArrayInputStream(decode);GZIPInputStream gzip = new GZIPInputStream(bais);byte[] buf = new byte[BUFFER_SIZE];int len = 0;ByteArrayOutputStream baos = new ByteArrayOutputStream();while((len=gzip.read(buf, 0, BUFFER_SIZE))!=-1){ baos.write(buf, 0, len);}gzip.close();baos.flush();decode = baos.toByteArray();baos.close();return new String(decode, "UTF-8");} catch (UnsupportedEncodingException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}return null;}/** * 十六进制字符串 转换为 byte[] *  * @param hexString *            the hex string * @return byte[] */public static byte[] hexStringToBytes(String hexString) {if (hexString == null || hexString.equals("")) {return null;}int length = hexString.length() / 2;char[] hexChars = hexString.toCharArray();byte[] d = new byte[length];for (int i = 0; i < length; i++) {int pos = i * 2;d[i] = (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1]));}return d;}/** * Convert char to byte *  * @param c *            char * @return byte */private static byte charToByte(char c) {return (byte) "0123456789abcdef".indexOf(c);// return (byte) "0123456789ABCDEF".indexOf(c);}/** * byte[] 转换为 十六进制字符串 *  * @param src * @return */public static String bytesToHexString(byte[] src) {StringBuilder stringBuilder = new StringBuilder("");if (src == null || src.length <= 0) {return null;}for (int i = 0; i < src.length; i++) {int v = src[i] & 0xFF;String hv = Integer.toHexString(v);if (hv.length() < 2) {stringBuilder.append(0);}stringBuilder.append(hv);}return stringBuilder.toString();}}
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