1.输入中文转换成拼音首字母。
需要的maven 工具包
<dependency><groupId>com.belerweb</groupId><artifactId>pinyin4j</artifactId><version>2.5.1</version></dependency>
/*** 输入中文字符串转换获得中文首字母* @param str 输入中文字符串* @return 首字母*/public static String getPinYinHeadChar(String str) {StringBuilder convert = new StringBuilder();for (int j = 0; j < str.length(); j++) {char word = str.charAt(j);String[] pinyinArray = PinyinHelper.toHanyuPinyinStringArray(word);if (pinyinArray != null) {convert.append(pinyinArray[0].charAt(0));} else {convert.append(word);}}return convert.toString();}
2.随机获得指定长度的数字
public static String create_nonce_code(int len) {String chars = "0123456789";StringBuilder res = new StringBuilder();for (int i = 0; i < len; i++) {Random rd = new Random();res.append(chars.charAt(rd.nextInt(chars.length() - 1)));}return res.toString();}
3.字符串转输入流InputStream
public static InputStream write(String data){InputStream input = null;try {input = new ByteArrayInputStream(data.getBytes("utf-8"));} catch (UnsupportedEncodingException e) {log.error("文件写入异常：",e);}return input;}
4.获得当前时间的前几个小时或者后几个小时,和当前时间的前后几分钟
private static final SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");/*** 获取当前时间之前或之后几小时 hour 正数为后几小时,负数为前几小时* @param hour* @return*/public static String getTimeByHour(int hour) {Calendar calendar = Calendar.getInstance();calendar.set(Calendar.HOUR_OF_DAY, calendar.get(Calendar.HOUR_OF_DAY) + hour);return sdf.format(calendar.getTime());}/*** 获取当前时间之前或之后几分钟 minute 正数为后几分钟,负数为前几分钟* @param minute* @return*/public static String getTimeByMinute(int minute) {Calendar calendar = Calendar.getInstance();calendar.add(Calendar.MINUTE, minute);return sdf.format(calendar.getTime());}
5.获得当前时间的月初日期和月末日期
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");String firstday, lastday;Calendar cale = Calendar.getInstance();// 获取当前月的第一天cale.add(Calendar.MONTH, 0);cale.set(Calendar.DAY_OF_MONTH, 1);firstday = format.format(cale.getTime())+" 00:00:00";// 获取当前月的最后一天cale = Calendar.getInstance();cale.add(Calendar.MONTH, 1);cale.set(Calendar.DAY_OF_MONTH, 0);lastday = format.format(cale.getTime())+" 23:59:59";
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