java处理数据文本时间小函数积累

统计某个字符在字符串中出现的次数

public int Charcount(String string, String str) {int ii = 0;if (string == null)return 0;int[] count = new int[string.length()];// 将字符串中索引字符存在临时变量中char mid = str.charAt(0);for (int j = 0; j < count.length; j++) {char temp = string.charAt(j);if (mid == temp)ii++;}return ii;}

时间字符串的比较

public static int compare_date(String DATE1, String DATE2) {DateFormat df = new SimpleDateFormat("yyyy-MM-dd hh:mm");try {Date dt1 = df.parse(DATE1);Date dt2 = df.parse(DATE2);if (dt1.getTime() > dt2.getTime()) {System.out.println("dt1 在dt2后");return 1;} else if (dt1.getTime() < dt2.getTime()) {System.out.println("dt1在dt2前");return -1;} else {return 0;}} catch (Exception exception) {exception.printStackTrace();}return 0;}public static void main(String args[]) {int i= compare_date("1995-11-12 15:21", "1999-12-11 09:59");System.out.println("i=="+i);}

规范化时间字符串

private final static Pattern PATTERN_TIME = Pattern.compile("\\d{4}-\\d{1,2}-\\d{1,2}");private final static Pattern PATTERN_TIME_HALF = Pattern.compile("\\d{2}-\\d{1,2}-\\d{1,2}");private final static Pattern PATTERN_Month = Pattern.compile("\\d{4}-\\d{1,2}");private final static Pattern PATTERN_YEAR = Pattern.compile("\\d{4}");private final static SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");protected long formatTime(String value) {if (value != null && !value.equals("")) {value = value.replaceAll("\\.|年|月", "-");Matcher matcher = PATTERN_TIME.matcher(value);Matcher matcherHalf = PATTERN_TIME_HALF.matcher(value);Matcher matcherMonth = PATTERN_Month.matcher(value);Matcher matcherYear = PATTERN_YEAR.matcher(value);if (matcher.find()) {value = matcher.group();} else if (matcherHalf.find()) {value = "20" + matcherHalf.group();} else if (matcherMonth.find()) {value = matcherMonth.group() + "-01";} else if (matcherYear.find()) {value = matcherYear.group() + "-01-01";}if (value.contains("待定") || value.contains("暂无")|| value.equals("") || value.equals(" ")|| value.equals("0") ) {System.out.println(value);return 0;}value = value.replaceAll("  | ", "");value = value.replaceAll("\\.|年|月", "-");value = value.replaceAll("日|秒", " ");value = value.replaceAll("时|分", ":");int temn = charCount(value, ":");if (temn == 0) {value += " 00:00:00";} else if (temn == 1) {value += ":00";} else if (temn == 2) {value += "00";}try {return simpleDateFormat.parse(value).getTime();} catch (Exception e) {e.printStackTrace();}}return 0;}

去掉中文字符

public static void main(String[] args) { String string = "富民县J2012-122号";  string = string.replaceAll("([\u4E00-\u9FA5]+)|([\u4E00-\u9FA5]+)", "");  System.out.println("[" + string + "]"); }

多个字符分割 比如我想把有，或者有分号的都分开

Pattern pattern = Pattern.compile("[,;]+");String[] strs = pattern.split("Java Hello World  Java,Hello,,World;Sun");for (int i=0;i<strs.length;i++) {    System.out.println(strs[i]);} 

取文本中多个数值的较大值

protected String formatMaxNumber(String value) {List<Float> fl = new ArrayList<Float>();if (value != null) {Matcher valueMatcher = intPattern.matcher(value);while (valueMatcher.find()) {String strRjl = valueMatcher.group();float rst = Float.valueOf(strRjl);fl.add(rst);}if (fl.size() == 1) {return fl.get(0).toString();} else if (fl.size() == 2) {if (fl.get(0) > fl.get(1)) {return fl.get(0).toString();} else {return fl.get(1).toString();}}}return null;}

面积单位的转化，把亩以及公顷转换成平方米

private final static Pattern PATTERN_PRICE = Pattern.compile("(([0-9]+\\.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*\\.[0-9]+)|([0-9]*[1-9][0-9]*))");// 全部转换为平方米public float formatArea(String value) {Matcher matcher = PATTERN_PRICE.matcher(value);if (matcher.find()) {if (value.contains("亩") && !value.contains("平方米")){  returnString.format("%.2f",Float.parseFloat(matcher.group()) * 666.67);} else if (value.contains("公顷") && !value.contains("平方米")) {   return   String.format("%.2f",Float.parseFloat(matcher.group()) * 10000);} else if ((value.contains("亩") && value.contains("平方米"))||(value.contains("公顷") && value.contains("平方米"))) { return   formatMaxNumber(value);} else { return  matcher.group();}} else {grantarea.setUseValue("0.0");}return grantarea;}protected String formatMaxNumber(String value) {List<Float> fl = new ArrayList<Float>();if (value != null) {Matcher valueMatcher = intPattern.matcher(value);while (valueMatcher.find()) {String strRjl = valueMatcher.group();float rst = Float.valueOf(strRjl);fl.add(rst);}if (fl.size() == 1) {return fl.get(0).toString();} else if (fl.size() == 2) {if (fl.get(0) > fl.get(1)) {return fl.get(0).toString();} else {return fl.get(1).toString();}}}return null;}

将中文日期转换为日期

    public static void main(String[] args) throws IOException {        testConvertZwrq();    }    private static void testConvertZwrq() {        String[] list = new String[] { "二○○九年四月三十日", "○九年四月三十日", "二○○九年十二月三十一日", "二零零九年十二月三十一日" };        for (String s : list) {            Date d = convertCnDate(s);            System.out.println(new SimpleDateFormat("yyyy-MM-dd").format(d));        }    }    public static Date convertCnDate(String cprq) {        int yearPos = cprq.indexOf("年");        int monthPos = cprq.indexOf("月");        String cnYear = cprq.substring(0, yearPos);        String cnMonth = cprq.substring(yearPos + 1, monthPos);        String cnDay = cprq.substring(monthPos + 1, cprq.length() - 1);        String year = ConvertCnYear(cnYear);        String month = ConvertCnDateNumber(cnMonth);        String day = ConvertCnDateNumber(cnDay);        Calendar c = Calendar.getInstance();        c.set(Calendar.YEAR, Integer.parseInt(year));        c.set(Calendar.MONTH, Integer.parseInt(month)-1);        c.set(Calendar.DAY_OF_MONTH, Integer.parseInt(day));        return c.getTime();    }    private static String ConvertCnYear(String cnYear) {        if(cnYear.length() == 2)           return "20" + ConvertCnNumberChar(cnYear);        else            return ConvertCnNumberChar(cnYear);    }    private static String ConvertCnDateNumber(String cnNumber) {        if (cnNumber.length() == 1) {            if(cnNumber.equals("十"))          return "10";            else          return ConvertCnNumberChar(cnNumber);        } else if (cnNumber.length() == 2) {            if (cnNumber.startsWith("十")) {                return "1" + ConvertCnNumberChar(cnNumber.substring(1, 2));            } else if (cnNumber.endsWith("十")) {                return ConvertCnNumberChar(cnNumber.substring(0, 1)) + "0";            } else {                return ConvertCnNumberChar(cnNumber);            }        } else if (cnNumber.length() == 3) {            return ConvertCnNumberChar(cnNumber.substring(0, 1) + cnNumber.substring(2, 3));        }        return null;    }    private static String ConvertCnNumberChar(String cnNumberStr) {        String ALL_CN_NUMBER = "○零一二三四五六七八九";        String ALL_NUMBER = "00123456789";        StringBuffer buf = new StringBuffer();        for (int i = 0; i < cnNumberStr.length(); i++) {            char c = cnNumberStr.charAt(i);            int index = ALL_CN_NUMBER.indexOf(c);            if (index != -1) {                buf.append(ALL_NUMBER.charAt(index));            } else {                buf.append(cnNumberStr.charAt(i));            }        }        return buf.toString();    }

JAVA的double值去掉"E"

BigDecimal bg=new BigDecimal("3.456785E-8");  System.out.println(bg.toPlainString());  

数字型字符串千分位加逗号

/** * 在数字型字符串千分位加逗号 * @param str * @return */  public static String addComma(String str){      boolean neg = false;      if (str.startsWith("-")){  //处理负数          str = str.substring(1);          neg = true;      }      String tail = null;      if (str.indexOf('.') != -1){ //处理小数点          tail = str.substring(str.indexOf('.'));          str = str.substring(0, str.indexOf('.'));      }      StringBuilder sb = new StringBuilder(str);      sb.reverse();      for (int i = 3; i < sb.length(); i += 4){          sb.insert(i, ',');      }      sb.reverse();      if (neg){          sb.insert(0, '-');      }      if (tail != null){          sb.append(tail);      }      return sb.toString();  }  

jsp页面把数值变成千分显示可以用:

Number格式化显示

1.头部引入：<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>

2.具体使用：

  整数显示 <fmt:formatNumber value="${ myList.money }" pattern="#" type="number"/>

  整数带千分符显示：
<fmt:formatNumber value="${num}" type="number"/>

获取double的整数部分

    /**     * 用于在EL中获取数字整数部分     *      * @param header     * @param end     * @return     */    public static int  getInt(Double num) {            return num.intValue();    }    

判断数字是否有小数位

 /**     * 用于在EL中判断数字是否有小数位     *      * @param header     * @param end     * @return     */    public static Boolean  getHaveFloatNumFlag(Double num) {               return num>num.intValue();    }

连接字符串

    /**     * 用于在EL中连接字符串header+end     *      * @param header     * @param end     * @return     */    public static String contact(String header, String end) {        return header.concat(end);    }

    

查找数组中最接近目标数的数--折半查找法

  

   /**     * 查找最接近目标值的数，并返回 索引    * @param array     * @param mutiple     * @return     */      public static Integer binarysearchKey(Object[] array, float mutiple) {      Arrays.sort(array);    int left = 0, right = 0;      for (right = array.length - 1; left != right;) {      int midIndex = (right + left) / 2;      int mid = (right - left);      Float midValue = Float.valueOf(array[midIndex].toString());      if (mutiple == midValue) {      return midIndex;      }      if (mutiple > midValue) {      left = midIndex;      } else {      right = midIndex;      }      if (mid <= 2) {      break;      }      }      System.out.println("要查找的数：" + mutiple + "最接近的数："    +(Math.abs(Float.valueOf(array[right].toString()) -mutiple) > Math.abs(Float.valueOf(array[left].toString()) -mutiple)  ? array[left] : array[right]));      return  (Integer) (Math.abs(Float.valueOf(array[right].toString()) -mutiple) > Math.abs(Float.valueOf(array[left].toString()) -mutiple)  ? left: right);      }