android开发字符串工具类(一)

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            package
             com.gzcivil.utils;

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              3
            import
             java.io.BufferedReader;

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            import
             java.io.ByteArrayOutputStream;

              5
            import
             java.io.InputStream;

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            import
             java.io.InputStreamReader;

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            import
             java.math.BigDecimal;

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            import
             java.text.SimpleDateFormat;

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            import
             java.util.Arrays;

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            import
             java.util.Calendar;

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            import
             java.util.Date;

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            import
             java.util.Locale;

             13
            import
             java.util.StringTokenizer;

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            import
             java.util.regex.Matcher;

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            import
             java.util.regex.Pattern;

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             17
            /**
             18
             * 字符串工具

             19
             * 

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             * 
            @author
             LiJinlun

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             * @time 2015-12-5

             22
            */
             23
            public
            class
             StringUtils {

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             25
            private
            static
             StringUtils instance;

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             27
            private
             StringUtils() {

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            super
            ();

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                }

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            public
            static
             String getDateTimeToString(Calendar cal, String format) {

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            return
             getDateTimeToString(cal.getTimeInMillis(), format);

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                }

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            public
            static String getDateTimeToString(long longTime, String format) {
 36         SimpleDateFormat sdf = new SimpleDateFormat(format, Locale.getDefault());
 37         Date date = new Date(longTime);
 38return sdf.format(date);
 39    }
 40 41publicstaticsynchronized StringUtils getInstance() {
 42if (instance == null)
 43             instance = new StringUtils();
 44return 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 */ 48publicstatic String clearNumberString(String str) {
 49int minIndex = Integer.MAX_VALUE;
 50int[] index = newint[10];
 51for (int i = 0; i < 10; i++) {
 52             index[i] = str.indexOf(String.valueOf(i));
 53if (index[i] != -1 && index[i] < minIndex) {
 54                 minIndex = index[i];
 55            }
 56        }
 57if (minIndex < Integer.MAX_VALUE) {
 58             str = str.substring(0, minIndex);
 59        }
 60return str;
 61    }
 62 63/** 64     * 判断字符串是否为空
 65*/ 66publicstaticboolean isEmpty(String str) {
 67returnnull == 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*/ 77publicstatic Boolean isMobilePhone(String str) {
 78         Boolean isMobileNo = false;
 79try {
 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        }
 86return isMobileNo;
 87    }
 88 89/** 90     * 获取字串字节长度
 91     * 
 92     * @param str
 93     * @return 94*/ 95publicstaticint getLength(String str) {
 96return 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 */100publicstaticdouble getDouble(double d) {
101returnnew BigDecimal(d).setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue();
102    }
103104/** 从double型返回String型，精确到小数点后2位 */105publicstatic String getStringByDouble(double d) {
106         String str = String.valueOf(new BigDecimal(d).setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue());
107try {
108int index = str.indexOf(‘.‘);
109if (index != -1) {
110                 String tmpStr = str.substring(index + 1);
111if ("0".equals(tmpStr)) {
112                     str = str.substring(0, index);
113                }
114            }
115         } catch (Exception e) {
116            e.printStackTrace();
117        }
118return str;
119    }
120121publicstatic String getCorrectDistance(int distance) {
122         String result = "";
123if (distance < 20) {
124             result = "附近";
125         } elseif (distance < 1000) {
126             result = distance + "m";
127         } else {
128             result = String.format("%.1f", distance / 1000f) + "km";
129        }
130return result;
131    }
132133/**134     * 将秒数转换成文字描述
135     * 
136     * @param tm单位秒
137*/138publicstatic String secondsToString(int tm) {
139if (tm <= 0)
140return "00:00:00";
141long hour = tm / 3600;
142         tm = tm % 3600;
143long min = tm / 60;
144         tm = tm % 60;
145146         String result = "";
147if (hour < 10) {
148             result = "0" + hour + ":";
149         } else {
150             result = String.valueOf(hour) + ":";
151        }
152153if (min < 10) {
154             result += "0" + min + ":";
155         } else {
156             result += min + ":";
157        }
158159if (tm < 10) {
160             result += "0" + tm;
161         } else {
162             result += String.valueOf(tm);
163        }
164return result;
165    }
166167/**168     * 检测是否JSON字串
169     * 
170     * @param source
171     * @return172*/173publicstaticboolean isJson(String source) {
174         String tmp = null == source ? "" : source.trim();
175if ("".equals(tmp) || tmp.length() < 1)
176returnfalse;
177elseif (tmp.startsWith("{") && tmp.endsWith("}"))
178returntrue;
179elseif (tmp.startsWith("[") && tmp.endsWith("]"))
180returntrue;
181else182returnfalse;
183    }
184185publicstatic String str2int(String source) {
186         String result = "";
187         LogUtils.i("ls", "result" + result);
188for (int i = 0; i < source.length(); i++) {
189if (source.charAt(i) >= ‘0‘ && source.charAt(i) <= ‘9‘)
190                 result += source.charAt(i);
191192        }
193return result;
194    }
195196/**197     * MD5编码
198     * 
199     * @param source
200     * @return201*/202publicstatic String md5(byte[] source) {
203char hexDigits[] = { ‘0‘, ‘1‘, ‘2‘, ‘3‘, ‘4‘, ‘5‘, ‘6‘, ‘7‘, ‘8‘, ‘9‘, ‘a‘, ‘b‘, ‘c‘, ‘d‘, ‘e‘, ‘f‘ };
204try {
205             java.security.MessageDigest md = java.security.MessageDigest.getInstance("MD5");
206            md.update(source);
207byte tmp[] = md.digest();
208char str[] = newchar[16 * 2];
209for (int i = 0, k = 0; i < 16; i++) {
210byte byte0 = tmp[i];
211                 str[k++] = hexDigits[byte0 >>> 4 & 0xf];
212                 str[k++] = hexDigits[byte0 & 0xf];
213            }
214returnnew String(str);
215         } catch (Exception e) {
216             LogUtils.e("md5(): error=" + e.getMessage(), "StringTool");
217return "";
218        }
219    }
220221/**222     * base64编码,将字节数组编码为字符串
223     * 
224     * @param source
225     * @return String
226*/227publicstatic String base64_encode(byte[] source) {
228char[] base64EncodeChars = newchar[] { ‘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‘, ‘+‘, ‘/‘ };
229try {
230             StringBuffer sb = new StringBuffer();
231int len = source.length;
232int i = 0;
233int b1, b2, b3;
234while (i < len) {
235                 b1 = source[i++] & 0xff;
236if (i == len) {
237                     sb.append(base64EncodeChars[b1 >>> 2]);
238                     sb.append(base64EncodeChars[(b1 & 0x3) << 4]);
239                     sb.append("==");
240break;
241                }
242                 b2 = source[i++] & 0xff;
243if (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("=");
248break;
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            }
256return sb.toString();
257         } catch (Exception e) {
258             LogUtils.e("base64_encode(): error=" + e.getMessage(), "StringTool");
259return "";
260        }
261    }
262263/**264     * base64编码,解码为字节数组
265     * 
266     * @param source
267     * @return byte[]
268*/269publicstaticbyte[] base64_decode(String source) {
270byte[] base64DecodeChars = newbyte[] { -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 };
271try {
272byte[] data = source.getBytes();
273int len = data.length;
274             ByteArrayOutputStream buf = new ByteArrayOutputStream(len);
275int i = 0;
276int b1, b2, b3, b4;
277while (i < len) {
278/* b1 */279do {
280                     b1 = base64DecodeChars[data[i++]];
281                 } while (i < len && b1 == -1);
282if (b1 == -1)
283break;
284285/* b2 */286do {
287                     b2 = base64DecodeChars[data[i++]];
288                 } while (i < len && b2 == -1);
289if (b2 == -1)
290break;
291                 buf.write((int) ((b1 << 2) | ((b2 & 0x30) >>> 4)));
292293/* b3 */294do {
295                     b3 = data[i++];
296if (b3 == 61)
297return buf.toByteArray();
298                     b3 = base64DecodeChars[b3];
299                 } while (i < len && b3 == -1);
300if (b3 == -1)
301break;
302                 buf.write((int) (((b2 & 0x0f) << 4) | ((b3 & 0x3c) >>> 2)));
303304/* b4 */305do {
306                     b4 = data[i++];
307if (b4 == 61)
308return buf.toByteArray();
309                     b4 = base64DecodeChars[b4];
310                 } while (i < len && b4 == -1);
311if (b4 == -1)
312break;
313                 buf.write((int) (((b3 & 0x03) << 6) | b4));
314            }
315return buf.toByteArray();
316         } catch (Exception e) {
317             LogUtils.i("ls", "base64_decode(): error=" + e.getMessage());
318return "".getBytes();
319        }
320    }
321322publicstatic String join(String separator, Object[] o) {
323return implode(separator, Arrays.asList(o));
324    }
325326protectedstatic <T> String implode(String separator, Iterable<T> elements) {
327         StringBuilder out = new StringBuilder();
328boolean first = true;
329for (Object s : elements) {
330if (s == null)
331continue;
332elseif (first)
333                 first = false;
334else335                out.append(separator);
336            out.append(s);
337        }
338return out.toString();
339    }
340341publicstatic String[] explode(String glue, String str) {
342        String[] outData;
343try {
344             StringTokenizer st = new StringTokenizer(str, glue);
345             outData = new String[st.countTokens()];
346for (int i = 0; st.hasMoreTokens();) {
347                 outData[i++] = st.nextToken();
348            }
349         } catch (Exception e) {
350             outData = new String[] { str };
351            e.printStackTrace();
352        }
353return outData;
354    }
355356/**357     * 得到字符串双字节长度
358     * 
359     * @param str
360     * @return361*/362publicstaticint getDoubleByteLength(String str) {
363return str.replaceAll("[^\\x00-\\xff]", "xx").trim().length();
364    }
365366/**367     * 将流转换成字符串
368     * 
369     * @param is
370     * @return371*/372publicstatic String getStringByStream(InputStream is) {
373         StringBuffer sb = new StringBuffer();
374try {
375             BufferedReader br = new BufferedReader(new InputStreamReader(is));
376             String line = null;
377while ((line = br.readLine()) != null) {
378                sb.append(line);
379            }
380         } catch (Exception e) {
381            e.printStackTrace();
382        }
383return sb.toString();
384    }
385386/**387     * 将流转换成字符串
388     * 
389     * @param is
390     * @param chatset
391     *            字符编码
392     * @return393*/394publicstatic String getStringByStream(InputStream is, String chatset) {
395         StringBuffer sb = new StringBuffer();
396try {
397byte[] bytes = newbyte[1024];
398int len = 0;
399while ((len = is.read(bytes)) != -1) {
400                 sb.append(new String(bytes, 0, len, chatset));
401            }
402         } catch (Exception e) {
403// TODO: handle exception404            e.printStackTrace();
405        }
406return sb.toString();
407    }
408409 }