android开发字符串工具类(一)

  1 package com.gzcivil.utils;
  2 
  3 import java.io.BufferedReader;
  4 import java.io.ByteArrayOutputStream;
  5 import java.io.InputStream;
  6 import java.io.InputStreamReader;
  7 import java.math.BigDecimal;
  8 import java.text.SimpleDateFormat;
  9 import java.util.Arrays;
 10 import java.util.Calendar;
 11 import java.util.Date;
 12 import java.util.Locale;
 13 import java.util.StringTokenizer;
 14 import java.util.regex.Matcher;
 15 import java.util.regex.Pattern;
 16 
 17 /**
 18  * 字符串工具
 19  * 
 20  * @author LiJinlun
 21  * @time 2015-12-5
 22  */
 23 public class StringUtils {
 24 
 25     private static StringUtils instance;
 26 
 27     private StringUtils() {
 28         super();
 29     }
 30 
 31     public static String getDateTimeToString(Calendar cal, String format) {
 32         return getDateTimeToString(cal.getTimeInMillis(), format);
 33     }
 34 
 35     public static String getDateTimeToString(long longTime, String format) {
 36         SimpleDateFormat sdf = new SimpleDateFormat(format, Locale.getDefault());
 37         Date date = new Date(longTime);
 38         return sdf.format(date);
 39     }
 40 
 41     public static synchronized StringUtils getInstance() {
 42         if (instance == null)
 43             instance = new StringUtils();
 44         return instance;
 45     }
 46 
 47     /** 将一个字符串从第一位开始截取到有数字出现的地方 */
 48     public static String clearNumberString(String str) {
 49         int minIndex = Integer.MAX_VALUE;
 50         int[] index = new int[10];
 51         for (int i = 0; i < 10; i++) {
 52             index[i] = str.indexOf(String.valueOf(i));
 53             if (index[i] != -1 && index[i] < minIndex) {
 54                 minIndex = index[i];
 55             }
 56         }
 57         if (minIndex < Integer.MAX_VALUE) {
 58             str = str.substring(0, minIndex);
 59         }
 60         return str;
 61     }
 62 
 63     /**
 64      * 判断字符串是否为空
 65      */
 66     public static boolean isEmpty(String str) {
 67         return null == str || str.trim().equals("");
 68     }
 69 
 70     /**
 71      * 描述：手机号格式验证.
 72      * 
 73      * @param str
 74      *            指定的手机号码字符串
 75      * @return 是否为手机号码格式:是为true，否则false
 76      */
 77     public static Boolean isMobilePhone(String str) {
 78         Boolean isMobileNo = false;
 79         try {
 80             Pattern p = Pattern.compile("^((13[0-9])|(14[0-9])|(15[0-9])|(16[0-9])|(17[0-9])|(18[0-9])|(19[0-9]))\\d{8}$");
 81             Matcher m = p.matcher(str);
 82             isMobileNo = m.matches();
 83         } catch (Exception e) {
 84             e.printStackTrace();
 85         }
 86         return isMobileNo;
 87     }
 88 
 89     /**
 90      * 获取字串字节长度
 91      * 
 92      * @param str
 93      * @return
 94      */
 95     public static int getLength(String str) {
 96         return str.replaceAll("[^\\x00-\\xff]", "**").trim().length();
 97     }
 98 
 99     /** 返回double数据d小数点后面2位有效数字 */
100     public static double getDouble(double d) {
101         return new BigDecimal(d).setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue();
102     }
103 
104     /** 从double型返回String型，精确到小数点后2位 */
105     public static String getStringByDouble(double d) {
106         String str = String.valueOf(new BigDecimal(d).setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue());
107         try {
108             int index = str.indexOf(‘.‘);
109             if (index != -1) {
110                 String tmpStr = str.substring(index + 1);
111                 if ("0".equals(tmpStr)) {
112                     str = str.substring(0, index);
113                 }
114             }
115         } catch (Exception e) {
116             e.printStackTrace();
117         }
118         return str;
119     }
120 
121     public static String getCorrectDistance(int distance) {
122         String result = "";
123         if (distance < 20) {
124             result = "附近";
125         } else if (distance < 1000) {
126             result = distance + "m";
127         } else {
128             result = String.format("%.1f", distance / 1000f) + "km";
129         }
130         return result;
131     }
132 
133     /**
134      * 将秒数转换成文字描述
135      * 
136      * @param tm单位秒
137      */
138     public static String secondsToString(int tm) {
139         if (tm <= 0)
140             return "00:00:00";
141         long hour = tm / 3600;
142         tm = tm % 3600;
143         long min = tm / 60;
144         tm = tm % 60;
145 
146         String result = "";
147         if (hour < 10) {
148             result = "0" + hour + ":";
149         } else {
150             result = String.valueOf(hour) + ":";
151         }
152 
153         if (min < 10) {
154             result += "0" + min + ":";
155         } else {
156             result += min + ":";
157         }
158 
159         if (tm < 10) {
160             result += "0" + tm;
161         } else {
162             result += String.valueOf(tm);
163         }
164         return result;
165     }
166 
167     /**
168      * 检测是否JSON字串
169      * 
170      * @param source
171      * @return
172      */
173     public static boolean isJson(String source) {
174         String tmp = null == source ? "" : source.trim();
175         if ("".equals(tmp) || tmp.length() < 1)
176             return false;
177         else if (tmp.startsWith("{") && tmp.endsWith("}"))
178             return true;
179         else if (tmp.startsWith("[") && tmp.endsWith("]"))
180             return true;
181         else
182             return false;
183     }
184 
185     public static String str2int(String source) {
186         String result = "";
187         LogUtils.i("ls", "result" + result);
188         for (int i = 0; i < source.length(); i++) {
189             if (source.charAt(i) >= ‘0‘ && source.charAt(i) <= ‘9‘)
190                 result += source.charAt(i);
191 
192         }
193         return result;
194     }
195 
196     /**
197      * MD5编码
198      * 
199      * @param source
200      * @return
201      */
202     public static String md5(byte[] source) {
203         char hexDigits[] = { ‘0‘, ‘1‘, ‘2‘, ‘3‘, ‘4‘, ‘5‘, ‘6‘, ‘7‘, ‘8‘, ‘9‘, ‘a‘, ‘b‘, ‘c‘, ‘d‘, ‘e‘, ‘f‘ };
204         try {
205             java.security.MessageDigest md = java.security.MessageDigest.getInstance("MD5");
206             md.update(source);
207             byte tmp[] = md.digest();
208             char str[] = new char[16 * 2];
209             for (int i = 0, k = 0; i < 16; i++) {
210                 byte byte0 = tmp[i];
211                 str[k++] = hexDigits[byte0 >>> 4 & 0xf];
212                 str[k++] = hexDigits[byte0 & 0xf];
213             }
214             return new String(str);
215         } catch (Exception e) {
216             LogUtils.e("md5(): error=" + e.getMessage(), "StringTool");
217             return "";
218         }
219     }
220 
221     /**
222      * base64编码,将字节数组编码为字符串
223      * 
224      * @param source
225      * @return String
226      */
227     public static String base64_encode(byte[] source) {
228         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‘, ‘+‘, ‘/‘ };
229         try {
230             StringBuffer sb = new StringBuffer();
231             int len = source.length;
232             int i = 0;
233             int b1, b2, b3;
234             while (i < len) {
235                 b1 = source[i++] & 0xff;
236                 if (i == len) {
237                     sb.append(base64EncodeChars[b1 >>> 2]);
238                     sb.append(base64EncodeChars[(b1 & 0x3) << 4]);
239                     sb.append("==");
240                     break;
241                 }
242                 b2 = source[i++] & 0xff;
243                 if (i == len) {
244                     sb.append(base64EncodeChars[b1 >>> 2]);
245                     sb.append(base64EncodeChars[((b1 & 0x03) << 4) | ((b2 & 0xf0) >>> 4)]);
246                     sb.append(base64EncodeChars[(b2 & 0x0f) << 2]);
247                     sb.append("=");
248                     break;
249                 }
250                 b3 = source[i++] & 0xff;
251                 sb.append(base64EncodeChars[b1 >>> 2]);
252                 sb.append(base64EncodeChars[((b1 & 0x03) << 4) | ((b2 & 0xf0) >>> 4)]);
253                 sb.append(base64EncodeChars[((b2 & 0x0f) << 2) | ((b3 & 0xc0) >>> 6)]);
254                 sb.append(base64EncodeChars[b3 & 0x3f]);
255             }
256             return sb.toString();
257         } catch (Exception e) {
258             LogUtils.e("base64_encode(): error=" + e.getMessage(), "StringTool");
259             return "";
260         }
261     }
262 
263     /**
264      * base64编码,解码为字节数组
265      * 
266      * @param source
267      * @return byte[]
268      */
269     public static byte[] base64_decode(String source) {
270         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 };
271         try {
272             byte[] data = source.getBytes();
273             int len = data.length;
274             ByteArrayOutputStream buf = new ByteArrayOutputStream(len);
275             int i = 0;
276             int b1, b2, b3, b4;
277             while (i < len) {
278                 /* b1 */
279                 do {
280                     b1 = base64DecodeChars[data[i++]];
281                 } while (i < len && b1 == -1);
282                 if (b1 == -1)
283                     break;
284 
285                 /* b2 */
286                 do {
287                     b2 = base64DecodeChars[data[i++]];
288                 } while (i < len && b2 == -1);
289                 if (b2 == -1)
290                     break;
291                 buf.write((int) ((b1 << 2) | ((b2 & 0x30) >>> 4)));
292 
293                 /* b3 */
294                 do {
295                     b3 = data[i++];
296                     if (b3 == 61)
297                         return buf.toByteArray();
298                     b3 = base64DecodeChars[b3];
299                 } while (i < len && b3 == -1);
300                 if (b3 == -1)
301                     break;
302                 buf.write((int) (((b2 & 0x0f) << 4) | ((b3 & 0x3c) >>> 2)));
303 
304                 /* b4 */
305                 do {
306                     b4 = data[i++];
307                     if (b4 == 61)
308                         return buf.toByteArray();
309                     b4 = base64DecodeChars[b4];
310                 } while (i < len && b4 == -1);
311                 if (b4 == -1)
312                     break;
313                 buf.write((int) (((b3 & 0x03) << 6) | b4));
314             }
315             return buf.toByteArray();
316         } catch (Exception e) {
317             LogUtils.i("ls", "base64_decode(): error=" + e.getMessage());
318             return "".getBytes();
319         }
320     }
321 
322     public static String join(String separator, Object[] o) {
323         return implode(separator, Arrays.asList(o));
324     }
325 
326     protected static <T> String implode(String separator, Iterable<T> elements) {
327         StringBuilder out = new StringBuilder();
328         boolean first = true;
329         for (Object s : elements) {
330             if (s == null)
331                 continue;
332             else if (first)
333                 first = false;
334             else
335                 out.append(separator);
336             out.append(s);
337         }
338         return out.toString();
339     }
340 
341     public static String[] explode(String glue, String str) {
342         String[] outData;
343         try {
344             StringTokenizer st = new StringTokenizer(str, glue);
345             outData = new String[st.countTokens()];
346             for (int i = 0; st.hasMoreTokens();) {
347                 outData[i++] = st.nextToken();
348             }
349         } catch (Exception e) {
350             outData = new String[] { str };
351             e.printStackTrace();
352         }
353         return outData;
354     }
355 
356     /**
357      * 得到字符串双字节长度
358      * 
359      * @param str
360      * @return
361      */
362     public static int getDoubleByteLength(String str) {
363         return str.replaceAll("[^\\x00-\\xff]", "xx").trim().length();
364     }
365 
366     /**
367      * 将流转换成字符串
368      * 
369      * @param is
370      * @return
371      */
372     public static String getStringByStream(InputStream is) {
373         StringBuffer sb = new StringBuffer();
374         try {
375             BufferedReader br = new BufferedReader(new InputStreamReader(is));
376             String line = null;
377             while ((line = br.readLine()) != null) {
378                 sb.append(line);
379             }
380         } catch (Exception e) {
381             e.printStackTrace();
382         }
383         return sb.toString();
384     }
385 
386     /**
387      * 将流转换成字符串
388      * 
389      * @param is
390      * @param chatset
391      *            字符编码
392      * @return
393      */
394     public static String getStringByStream(InputStream is, String chatset) {
395         StringBuffer sb = new StringBuffer();
396         try {
397             byte[] bytes = new byte[1024];
398             int len = 0;
399             while ((len = is.read(bytes)) != -1) {
400                 sb.append(new String(bytes, 0, len, chatset));
401             }
402         } catch (Exception e) {
403             // TODO: handle exception
404             e.printStackTrace();
405         }
406         return sb.toString();
407     }
408 
409 }