Android 常用开发工具类
jopen
9年前
在开发中使用一些工具类，能让代码更加简洁，开发效率也更高，下面是我收集的Android中常用的一些开发工具类，如果大家有更好的工具，欢迎私信我。
数据管理的工具类，清理缓存数据
import java.io.File; import java.math.BigDecimal; import android.content.Context; import android.os.Environment; import android.text.TextUtils; /** * 本应用数据清除管理器 * * */ public class DataCleanManager { /** * * 清除本应用内部缓存(/data/data/com.xxx.xxx/cache) * * * * @param context */ public static void cleanInternalCache(Context context) { deleteFilesByDirectory(context.getCacheDir()); } /** * * 清除本应用所有数据库(/data/data/com.xxx.xxx/databases) * * * * @param context */ public static void cleanDatabases(Context context) { deleteFilesByDirectory(new File("/data/data/" + context.getPackageName() + "/databases")); } /** * * 清除本应用SharedPreference(/data/data/com.xxx.xxx/shared_prefs) * * * @param context */ public static void cleanSharedPreference(Context context) { deleteFilesByDirectory(new File("/data/data/" + context.getPackageName() + "/shared_prefs")); } /** * * 按名字清除本应用数据库 * * * * @param context * @param dbName */ public static void cleanDatabaseByName(Context context, String dbName) { context.deleteDatabase(dbName); } /** * * 清除/data/data/com.xxx.xxx/files下的内容 * * * * @param context */ public static void cleanFiles(Context context) { deleteFilesByDirectory(context.getFilesDir()); } /** * * 清除外部cache下的内容(/mnt/sdcard/android/data/com.xxx.xxx/cache) * * @param context */ public static void cleanExternalCache(Context context) { if (Environment.getExternalStorageState().equals( Environment.MEDIA_MOUNTED)) { deleteFilesByDirectory(context.getExternalCacheDir()); } } /** * * 清除自定义路径下的文件，使用需小心，请不要误删。而且只支持目录下的文件删除 * * * * @param filePath * */ public static void cleanCustomCache(String filePath) { deleteFilesByDirectory(new File(filePath)); } /** * * 清除本应用所有的数据 * * * * @param context * @param filepath */ public static void cleanApplicationData(Context context, String... filepath) { cleanInternalCache(context); cleanExternalCache(context); cleanDatabases(context); cleanSharedPreference(context); cleanFiles(context); if (filepath == null) { return; } for (String filePath : filepath) { cleanCustomCache(filePath); } } /** * * 删除方法 这里只会删除某个文件夹下的文件，如果传入的directory是个文件，将不做处理 * * * * @param directory */ private static void deleteFilesByDirectory(File directory) { if (directory.isFile()) { directory.delete(); } else if (directory != null && directory.exists() && directory.isDirectory()) { for (File item : directory.listFiles()) { deleteFilesByDirectory(item); } } } // 获取文件 // Context.getExternalFilesDir() --> SDCard/Android/data/你的应用的包名/files/ // 目录，一般放一些长时间保存的数据 // Context.getExternalCacheDir() --> // SDCard/Android/data/你的应用包名/cache/目录，一般存放临时缓存数据 public static long getFolderSize(File file) throws Exception { long size = 0; try { File[] fileList = file.listFiles(); for (int i = 0; i < fileList.length; i++) { // 如果下面还有文件 if (fileList[i].isDirectory()) { size = size + getFolderSize(fileList[i]); } else { size = size + fileList[i].length(); } } } catch (Exception e) { e.printStackTrace(); } return size; } /** * 删除指定目录下文件及目录 * * @param deleteThisPath * @param filepath * @return */ public static void deleteFolderFile(String filePath, boolean deleteThisPath) { if (!TextUtils.isEmpty(filePath)) { try { File file = new File(filePath); if (file.isDirectory()) {// 如果下面还有文件 File files[] = file.listFiles(); for (int i = 0; i < files.length; i++) { deleteFolderFile(files[i].getAbsolutePath(), true); } } if (deleteThisPath) { if (!file.isDirectory()) {// 如果是文件，删除 file.delete(); } else {// 目录 if (file.listFiles().length == 0) {// 目录下没有文件或者目录，删除 file.delete(); } } } } catch (Exception e) { e.printStackTrace(); } } } /** * 格式化单位 * * @param size * @return */ public static String getFormatSize(double size) { double kiloByte = size / 1024; if (kiloByte < 1) { return size + "Byte"; } double megaByte = kiloByte / 1024; if (megaByte < 1) { BigDecimal result1 = new BigDecimal(Double.toString(kiloByte)); return result1.setScale(2, BigDecimal.ROUND_HALF_UP) .toPlainString() + "KB"; } double gigaByte = megaByte / 1024; if (gigaByte < 1) { BigDecimal result2 = new BigDecimal(Double.toString(megaByte)); return result2.setScale(2, BigDecimal.ROUND_HALF_UP) .toPlainString() + "MB"; } double teraBytes = gigaByte / 1024; if (teraBytes < 1) { BigDecimal result3 = new BigDecimal(Double.toString(gigaByte)); return result3.setScale(2, BigDecimal.ROUND_HALF_UP) .toPlainString() + "GB"; } BigDecimal result4 = new BigDecimal(teraBytes); return result4.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString() + "TB"; } public static String getCacheSize(File file) throws Exception { return getFormatSize(getFolderSize(file)); } }手机号，邮箱，身份证校验工具类 import java.util.HashMap; import java.util.regex.Matcher; import java.util.regex.Pattern; public class VerificationUtils { private final static Pattern emailer = Pattern .compile("\\w+([-+.]\\w+)*@\\w+([-.]\\w+)*\\.\\w+([-.]\\w+)*"); private static String _codeError; // wi =2(n-1)(mod 11) final static int[] wi = { 7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2, 1 }; // verify digit final static int[] vi = { 1, 0, 'X', 9, 8, 7, 6, 5, 4, 3, 2 }; private static int[] ai = new int[18]; private static String[] _areaCode = { "11", "12", "13", "14", "15", "21", "22", "23", "31", "32", "33", "34", "35", "36", "37", "41", "42", "43", "44", "45", "46", "50", "51", "52", "53", "54", "61", "62", "63", "64", "65", "71", "81", "82", "91" }; private static HashMap<String, Integer> dateMap; private static HashMap<String, String> areaCodeMap; static { dateMap = new HashMap<String, Integer>(); dateMap.put("01", 31); dateMap.put("02", null); dateMap.put("03", 31); dateMap.put("04", 30); dateMap.put("05", 31); dateMap.put("06", 30); dateMap.put("07", 31); dateMap.put("08", 31); dateMap.put("09", 30); dateMap.put("10", 31); dateMap.put("11", 30); dateMap.put("12", 31); areaCodeMap = new HashMap<String, String>(); for (String code : _areaCode) { areaCodeMap.put(code, null); } } /** * 验证手机号 * * @param str * @return */ public static boolean isMobile(String str) { Pattern p = null; Matcher m = null; boolean b = false; p = Pattern.compile("^[1][3,4,5,8,7][0-9]{9}$"); // p = Pattern.compile("^((13[0-9])|(15[^4,\\D])|(18[0,5-9]))\\d{8}$"); m = p.matcher(str); b = m.matches(); return b; } /** * 验证邮箱 * * @param email * @return */ public static boolean isEmail(String email) { if (email == null || email.trim().length() == 0) return false; return emailer.matcher(email).matches(); } public static boolean isEmpty(String input) { if (input == null || "".equals(input)) return true; for (int i = 0; i < input.length(); i++) { char c = input.charAt(i); if (c != ' ' && c != '\t' && c != '\r' && c != '\n') { return false; } } return true; } /** * 验证位数 * @param code * @return */ public static boolean verifyLength(String code) { int length = code.length(); if (length == 15 || length == 18) { return true; } else { return false; } } /** * 验证省区 * @param code * @return */ public static boolean verifyAreaCode(String code) { String areaCode = code.substring(0, 2); if (areaCodeMap.containsKey(areaCode)) { return true; } else { return false; } } /** * 验证生日 * @param code * @return */ public static boolean verifyBirthdayCode(String code) { String month = code.substring(10, 12); boolean isEighteenCode = (18 == code.length()); if (!dateMap.containsKey(month)) { return false; } String dayCode = code.substring(12, 14); Integer day = dateMap.get(month); String yearCode = code.substring(6, 10); Integer year = Integer.valueOf(yearCode); if (day != null) { if (Integer.valueOf(dayCode) > day || Integer.valueOf(dayCode) < 1) { return false; } } else { if ((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0)) { if (Integer.valueOf(dayCode) > 29 || Integer.valueOf(dayCode) < 1) { return false; } } else { if (Integer.valueOf(dayCode) > 28 || Integer.valueOf(dayCode) < 1) { return false; } } } return true; } public static boolean containsAllNumber(String code) { String str = ""; if (code.length() == 15) { str = code.substring(0, 15); } else if (code.length() == 18) { str = code.substring(0, 17); } char[] ch = str.toCharArray(); for (int i = 0; i < ch.length; i++) { if (!(ch[i] >= '0' && ch[i] <= '9')) { return false; } } return true; } public static boolean verify(String idcard) { if (!verifyLength(idcard)) { return false; } if (!containsAllNumber(idcard)) { return false; } String eifhteencard = ""; if (idcard.length() == 15) { eifhteencard = uptoeighteen(idcard); } else { eifhteencard = idcard; } if (!verifyAreaCode(eifhteencard)) { return false; } if (!verifyBirthdayCode(eifhteencard)) { return false; } if (!verifyMOD(eifhteencard)) { return false; } return true; } public static boolean verifyMOD(String code) { String verify = code.substring(17, 18); if ("x".equals(verify)) { code = code.replaceAll("x", "X"); verify = "X"; } String verifyIndex = getVerify(code); if (verify.equals(verifyIndex)) { return true; } // int x=17; // if(code.length()==15){ // x=14; // } return false; } public static String getVerify(String eightcardid) { int remaining = 0; if (eightcardid.length() == 18) { eightcardid = eightcardid.substring(0, 17); } if (eightcardid.length() == 17) { int sum = 0; for (int i = 0; i < 17; i++) { String k = eightcardid.substring(i, i + 1); ai[i] = Integer.parseInt(k); } for (int i = 0; i < 17; i++) { sum = sum + wi[i] * ai[i]; } remaining = sum % 11; } return remaining == 2 ? "X" : String.valueOf(vi[remaining]); } public static String uptoeighteen(String fifteencardid) { String eightcardid = fifteencardid.substring(0, 6); eightcardid = eightcardid + "19"; eightcardid = eightcardid + fifteencardid.substring(6, 15); eightcardid = eightcardid + getVerify(eightcardid); return eightcardid; } }sharedPreferences封装工具类
import android.content.Context; import android.content.SharedPreferences; import android.content.SharedPreferences.Editor; public class SharedPreferencesUtil { /** * 保存在手机里面的文件名 */ private static final String SP_NAME = "sp_name"; public static void setStringParam(Context context, String key, String value) { SharedPreferences sp = context.getSharedPreferences(SP_NAME, Context.MODE_PRIVATE); Editor edit = sp.edit(); edit.putString(key, value); edit.commit(); key = null; value = null; edit = null; sp = null; context = null; } /** * 保存字符串数据类型 * * @param context * @param keys * @param values */ public static void setStringParams(Context context, String[] keys, String[] values) { SharedPreferences sp = context.getSharedPreferences(SP_NAME, Context.MODE_PRIVATE); Editor edit = sp.edit(); for (int i = 0; i < keys.length; i++) { edit.putString(keys[i], values[i]); } keys = null; values = null; edit.commit(); edit = null; sp = null; context = null; } /** * 保存所有数据类型 保存数据的方法，我们需要拿到保存数据的具体类型，然后根据类型调用不同的保存方法 * * @param context * @param key * @param object */ public static void setParam(Context context, String key, Object object) { String type = object.getClass().getSimpleName(); SharedPreferences sp = context.getSharedPreferences(SP_NAME, Context.MODE_PRIVATE); SharedPreferences.Editor editor = sp.edit(); if ("String".equals(type)) { editor.putString(key, (String) object); } else if ("Integer".equals(type)) { editor.putInt(key, (Integer) object); } else if ("Boolean".equals(type)) { editor.putBoolean(key, (Boolean) object); } else if ("Float".equals(type)) { editor.putFloat(key, (Float) object); } else if ("Long".equals(type)) { editor.putLong(key, (Long) object); } key = null; object = null; editor.commit(); editor = null; sp = null; context = null; } /** * 得到保存数据的方法，我们根据默认值得到保存的数据的具体类型，然后调用相对于的方法获取值 * * @param context * @param key * @param defaultObject * @return */ public static Object getParam(Context context, String key, Object defaultObject) { String type = defaultObject.getClass().getSimpleName(); SharedPreferences sp = context.getSharedPreferences(SP_NAME, Context.MODE_PRIVATE); if ("String".equals(type)) { return sp.getString(key, (String) defaultObject); } else if ("Integer".equals(type)) { return sp.getInt(key, (Integer) defaultObject); } else if ("Boolean".equals(type)) { return sp.getBoolean(key, (Boolean) defaultObject); } else if ("Float".equals(type)) { return sp.getFloat(key, (Float) defaultObject); } else if ("Long".equals(type)) { return sp.getLong(key, (Long) defaultObject); } return null; } }Service工具类 import java.util.List; import android.app.ActivityManager; import android.content.Context; /** * 服务是否运行检测帮助类 * */ public class ServiceUtil { /** * 判断服务是否后台运行 * * @param context * Context * @param className * 判断的服务名字 * @return true 在运行 false 不在运行 */ public static boolean isServiceRun(Context mContext, String className) { boolean isRun = false; ActivityManager activityManager = (ActivityManager) mContext .getSystemService(Context.ACTIVITY_SERVICE); List<ActivityManager.RunningServiceInfo> serviceList = activityManager .getRunningServices(40); int size = serviceList.size(); for (int i = 0; i < size; i++) { if (serviceList.get(i).service.getClassName().equals(className) == true) { isRun = true; break; } } return isRun; } }Log日志工具类
import android.util.Log; /** * Log显示工具类 */ public class LogUtil { /** * 开发 */ private final static int DEVELOP = 0; /** * 测试 */ private final static int TEST = 1; /** * 上线 */ private final static int ONLINE = 2; /** * 当前状态 */ private final static int NOWSTATE = DEVELOP; public static void info(String msg) { info("volunteer", msg); } public static void info(String TAG, String msg) { switch (NOWSTATE) { case DEVELOP: Log.i(TAG, "develop:---" + msg); break; case TEST: Log.i(TAG, "test:---" + msg); break; case ONLINE: break; } } }MD5 加密工具类
public final class MD5Utils { private static final char Digit[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' }; private static final byte PADDING[] = { -128, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; private static long state[] = new long[4]; private static long count[] = new long[2]; private static byte buffer[] = new byte[64]; private static String digestHexStr; private static byte digest[] = new byte[16]; private MD5Utils() { } /** * 没有加盐 小写输出 * @param s * @return */ public static String toMD5(String s) { md5Init(); md5Update(s.getBytes(), s.length()); md5Final(); digestHexStr = ""; for(int i = 0; i < 16; i++) digestHexStr = digestHexStr + byteHEX(digest[i]); return digestHexStr; } private static void md5Init() { count[0] = 0L; count[1] = 0L; state[0] = 0x67452301L; state[1] = 0xefcdab89L; state[2] = 0x98badcfeL; state[3] = 0x10325476L; } private static long F(long x, long y, long z) { return (x & y) | ((~x) & z); } private static long G(long x, long y, long z) { return (x & z) | (y & (~z)); } private static long H(long x, long y, long z) { return x ^ y ^ z; } private static long I(long x, long y, long z) { return y ^ (x | (~z)); } private static long FF(long l, long l1, long l2, long l3, long l4, long l5, long l6) { l += F(l1, l2, l3) + l4 + l6; l = (int)l << (int)l5 | (int)l >>> (int)(32L - l5); l += l1; return l; } private static long GG(long l, long l1, long l2, long l3, long l4, long l5, long l6) { l += G(l1, l2, l3) + l4 + l6; l = (int)l << (int)l5 | (int)l >>> (int)(32L - l5); l += l1; return l; } private static long HH(long l, long l1, long l2, long l3, long l4, long l5, long l6) { l += H(l1, l2, l3) + l4 + l6; l = (int)l << (int)l5 | (int)l >>> (int)(32L - l5); l += l1; return l; } private static long II(long l, long l1, long l2, long l3, long l4, long l5, long l6) { l += I(l1, l2, l3) + l4 + l6; l = (int)l << (int)l5 | (int)l >>> (int)(32L - l5); l += l1; return l; } private static void md5Update(byte abyte0[], int i) { byte abyte1[] = new byte[64]; int k = (int)(count[0] >>> 3) & 0x3f; if ((count[0] += i << 3) < (long)(i << 3)) count[1]++; count[1] += i >>> 29; int l = 64 - k; int j; if (i >= l) { md5Memcpy(buffer, abyte0, k, 0, l); md5Transform(buffer); for(j = l; j + 63 < i; j += 64) { md5Memcpy(abyte1, abyte0, 0, j, 64); md5Transform(abyte1); } k = 0; } else { j = 0; } md5Memcpy(buffer, abyte0, k, j, i - j); } private static void md5Final() { byte abyte0[] = new byte[8]; Encode(abyte0, count, 8); int i = (int)(count[0] >>> 3) & 0x3f; int j = i >= 56 ? 120 - i : 56 - i; md5Update(PADDING, j); md5Update(abyte0, 8); Encode(digest, state, 16); } private static void md5Memcpy(byte abyte0[], byte abyte1[], int i, int j, int k) { for(int l = 0; l < k; l++) abyte0[i + l] = abyte1[j + l]; } private static void md5Transform(byte abyte0[]) { long l = state[0]; long l1 = state[1]; long l2 = state[2]; long l3 = state[3]; long al[] = new long[16]; Decode(al, abyte0, 64); l = FF(l, l1, l2, l3, al[0], 7L, 0xd76aa478L); l3 = FF(l3, l, l1, l2, al[1], 12L, 0xe8c7b756L); l2 = FF(l2, l3, l, l1, al[2], 17L, 0x242070dbL); l1 = FF(l1, l2, l3, l, al[3], 22L, 0xc1bdceeeL); l = FF(l, l1, l2, l3, al[4], 7L, 0xf57c0fafL); l3 = FF(l3, l, l1, l2, al[5], 12L, 0x4787c62aL); l2 = FF(l2, l3, l, l1, al[6], 17L, 0xa8304613L); l1 = FF(l1, l2, l3, l, al[7], 22L, 0xfd469501L); l = FF(l, l1, l2, l3, al[8], 7L, 0x698098d8L); l3 = FF(l3, l, l1, l2, al[9], 12L, 0x8b44f7afL); l2 = FF(l2, l3, l, l1, al[10], 17L, 0xffff5bb1L); l1 = FF(l1, l2, l3, l, al[11], 22L, 0x895cd7beL); l = FF(l, l1, l2, l3, al[12], 7L, 0x6b901122L); l3 = FF(l3, l, l1, l2, al[13], 12L, 0xfd987193L); l2 = FF(l2, l3, l, l1, al[14], 17L, 0xa679438eL); l1 = FF(l1, l2, l3, l, al[15], 22L, 0x49b40821L); l = GG(l, l1, l2, l3, al[1], 5L, 0xf61e2562L); l3 = GG(l3, l, l1, l2, al[6], 9L, 0xc040b340L); l2 = GG(l2, l3, l, l1, al[11], 14L, 0x265e5a51L); l1 = GG(l1, l2, l3, l, al[0], 20L, 0xe9b6c7aaL); l = GG(l, l1, l2, l3, al[5], 5L, 0xd62f105dL); l3 = GG(l3, l, l1, l2, al[10], 9L, 0x2441453L); l2 = GG(l2, l3, l, l1, al[15], 14L, 0xd8a1e681L); l1 = GG(l1, l2, l3, l, al[4], 20L, 0xe7d3fbc8L); l = GG(l, l1, l2, l3, al[9], 5L, 0x21e1cde6L); l3 = GG(l3, l, l1, l2, al[14], 9L, 0xc33707d6L); l2 = GG(l2, l3, l, l1, al[3], 14L, 0xf4d50d87L); l1 = GG(l1, l2, l3, l, al[8], 20L, 0x455a14edL); l = GG(l, l1, l2, l3, al[13], 5L, 0xa9e3e905L); l3 = GG(l3, l, l1, l2, al[2], 9L, 0xfcefa3f8L); l2 = GG(l2, l3, l, l1, al[7], 14L, 0x676f02d9L); l1 = GG(l1, l2, l3, l, al[12], 20L, 0x8d2a4c8aL); l = HH(l, l1, l2, l3, al[5], 4L, 0xfffa3942L); l3 = HH(l3, l, l1, l2, al[8], 11L, 0x8771f681L); l2 = HH(l2, l3, l, l1, al[11], 16L, 0x6d9d6122L); l1 = HH(l1, l2, l3, l, al[14], 23L, 0xfde5380cL); l = HH(l, l1, l2, l3, al[1], 4L, 0xa4beea44L); l3 = HH(l3, l, l1, l2, al[4], 11L, 0x4bdecfa9L); l2 = HH(l2, l3, l, l1, al[7], 16L, 0xf6bb4b60L); l1 = HH(l1, l2, l3, l, al[10], 23L, 0xbebfbc70L); l = HH(l, l1, l2, l3, al[13], 4L, 0x289b7ec6L); l3 = HH(l3, l, l1, l2, al[0], 11L, 0xeaa127faL); l2 = HH(l2, l3, l, l1, al[3], 16L, 0xd4ef3085L); l1 = HH(l1, l2, l3, l, al[6], 23L, 0x4881d05L); l = HH(l, l1, l2, l3, al[9], 4L, 0xd9d4d039L); l3 = HH(l3, l, l1, l2, al[12], 11L, 0xe6db99e5L); l2 = HH(l2, l3, l, l1, al[15], 16L, 0x1fa27cf8L); l1 = HH(l1, l2, l3, l, al[2], 23L, 0xc4ac5665L); l = II(l, l1, l2, l3, al[0], 6L, 0xf4292244L); l3 = II(l3, l, l1, l2, al[7], 10L, 0x432aff97L); l2 = II(l2, l3, l, l1, al[14], 15L, 0xab9423a7L); l1 = II(l1, l2, l3, l, al[5], 21L, 0xfc93a039L); l = II(l, l1, l2, l3, al[12], 6L, 0x655b59c3L); l3 = II(l3, l, l1, l2, al[3], 10L, 0x8f0ccc92L); l2 = II(l2, l3, l, l1, al[10], 15L, 0xffeff47dL); l1 = II(l1, l2, l3, l, al[1], 21L, 0x85845dd1L); l = II(l, l1, l2, l3, al[8], 6L, 0x6fa87e4fL); l3 = II(l3, l, l1, l2, al[15], 10L, 0xfe2ce6e0L); l2 = II(l2, l3, l, l1, al[6], 15L, 0xa3014314L); l1 = II(l1, l2, l3, l, al[13], 21L, 0x4e0811a1L); l = II(l, l1, l2, l3, al[4], 6L, 0xf7537e82L); l3 = II(l3, l, l1, l2, al[11], 10L, 0xbd3af235L); l2 = II(l2, l3, l, l1, al[2], 15L, 0x2ad7d2bbL); l1 = II(l1, l2, l3, l, al[9], 21L, 0xeb86d391L); state[0] += l; state[1] += l1; state[2] += l2; state[3] += l3; } private static void Encode(byte abyte0[], long al[], int i) { int j = 0; for(int k = 0; k < i; k += 4) { abyte0[k] = (byte)(int)(al[j] & 255L); abyte0[k + 1] = (byte)(int)(al[j] >>> 8 & 255L); abyte0[k + 2] = (byte)(int)(al[j] >>> 16 & 255L); abyte0[k + 3] = (byte)(int)(al[j] >>> 24 & 255L); j++; } } private static void Decode(long al[], byte abyte0[], int i) { int j = 0; for (int k = 0; k < i; k += 4) { al[j] = b2iu(abyte0[k]) | b2iu(abyte0[k + 1]) << 8 | b2iu(abyte0[k + 2]) << 16 | b2iu(abyte0[k + 3]) << 24; j++; } } private static long b2iu(byte byte0) { return byte0 >= 0 ? byte0 : byte0 & 0xff; } private static String byteHEX(byte byte0) { char ac[] = new char[2]; ac[0] = Digit[byte0 >>> 4 & 0xf]; ac[1] = Digit[byte0 & 0xf]; return new String(ac); } public static void main(String[] args) { System.out.println(toMD5("123456")); } }可逆加密算法工具类 import java.io.UnsupportedEncodingException; public class Base64Utils { private static char[] base64EncodeChars = new char[] { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/' }; private static byte[] base64DecodeChars = new byte[] { -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1 }; /** * 加密 * * @param data * @return */ public static String encode(byte[] data) { StringBuffer sb = new StringBuffer(); int len = data.length; int i = 0; int b1, b2, b3; while (i < len) { b1 = data[i++] & 0xff; if (i == len) { sb.append(base64EncodeChars[b1 >>> 2]); sb.append(base64EncodeChars[(b1 & 0x3) << 4]); sb.append("=="); break; } b2 = data[i++] & 0xff; if (i == len) { sb.append(base64EncodeChars[b1 >>> 2]); sb.append(base64EncodeChars[((b1 & 0x03) << 4) | ((b2 & 0xf0) >>> 4)]); sb.append(base64EncodeChars[(b2 & 0x0f) << 2]); sb.append("="); break; } b3 = data[i++] & 0xff; sb.append(base64EncodeChars[b1 >>> 2]); sb.append(base64EncodeChars[((b1 & 0x03) << 4) | ((b2 & 0xf0) >>> 4)]); sb.append(base64EncodeChars[((b2 & 0x0f) << 2) | ((b3 & 0xc0) >>> 6)]); sb.append(base64EncodeChars[b3 & 0x3f]); } return sb.toString(); } /** * 解密 * * @param str * @return */ public static byte[] decode(String str) { try { return decodePrivate(str); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } return new byte[] {}; } private static byte[] decodePrivate(String str) throws UnsupportedEncodingException { StringBuffer sb = new StringBuffer(); byte[] data = null; data = str.getBytes("US-ASCII"); int len = data.length; int i = 0; int b1, b2, b3, b4; while (i < len) { do { b1 = base64DecodeChars[data[i++]]; } while (i < len && b1 == -1); if (b1 == -1) break; do { b2 = base64DecodeChars[data[i++]]; } while (i < len && b2 == -1); if (b2 == -1) break; sb.append((char) ((b1 << 2) | ((b2 & 0x30) >>> 4))); do { b3 = data[i++]; if (b3 == 61) return sb.toString().getBytes("iso8859-1"); b3 = base64DecodeChars[b3]; } while (i < len && b3 == -1); if (b3 == -1) break; sb.append((char) (((b2 & 0x0f) << 4) | ((b3 & 0x3c) >>> 2))); do { b4 = data[i++]; if (b4 == 61) return sb.toString().getBytes("iso8859-1"); b4 = base64DecodeChars[b4]; } while (i < len && b4 == -1); if (b4 == -1) break; sb.append((char) (((b3 & 0x03) << 6) | b4)); } return sb.toString().getBytes("iso8859-1"); } }源码下载