java|java 如何从字符串里面提取时间 java如何从字符串里面提取时间

如何从字符串里面提取时间

我们可以使用正则表达式

从字符串中提取年份，要求输出1000-4999之间的所有年份

正则表达式
传统匹配：

如何从字符串里面提取时间今天接到一个需求，需要从一段带有时间串的字符串里面提取出时间保存。

"PDFS(iZh9k5gurgwcwpZ) 2020-01-01 21:27:36.560 >订单编号:1112233 提交订单成功! 跟踪号:待取跟踪号内部单号:2342244"

需要从上面数据中心提取出 2020-01-01 21:27:36要怎么操作呢？

我们可以使用正则表达式
对时间串进行提取，并处理，代码如下：

package com.epean.trade.framework.util; import org.apache.commons.lang.time.DateFormatUtils; import org.apache.commons.lang.time.DateUtils; import java.text.ParseException; import java.util.Date; import java.util.regex.Matcher; import java.util.regex.Pattern; /** * Created by chpeng on 2020/08/18 0008. */public class StringDateUtils { /**** @Description: 从字符串中截取出正确的时间* @param stringTime* @return:* @throws*/ public static Date cutDate(String stringTime) {String regs[] = { "\\d{4}年\\d{2}月\\d{2}日\\s\\d{2}时\\d{2}分\\d{2}秒","\\d{4}年\\d{2}月\\d{2}日\\s\\d{1}时\\d{2}分\\d{2}秒","\\d{4}年\\d{1}月\\d{2}日\\s\\d{1}时\\d{2}分\\d{2}秒","\\d{4}年\\d{1}月\\d{2}日\\s\\d{2}时\\d{2}分\\d{2}秒","\\d{4}年\\d{2}月\\d{2}日\\d{2}时\\d{2}分\\d{2}秒","\\d{4}年\\d{2}月\\d{2}日\\s\\d{2}时\\d{2}分","\\d{4}年\\d{1}月\\d{2}日\\s\\d{2}时\\d{2}分","\\d{4}年\\d{1}月\\d{2}日\\s\\d{1}时\\d{2}分","\\d{4}年\\d{1}月\\d{2}日\\s\\d{2}时\\d{2}分","\\d{4}年\\d{2}月\\d{2}日\\d{2}时\\d{2}分","\\d{4}年\\d{2}月\\d{2}日\\s\\d{2}时","\\d{4}年\\d{2}月\\d{2}日\\s\\d{1}时","\\d{4}年\\d{1}月\\d{2}日\\s\\d{2}时","\\d{4}年\\d{1}月\\d{2}日\\s\\d{1}时","\\d{4}年\\d{2}月\\d{2}日\\d{2}时", "\\d{4}年\\d{2}月\\d{2}日","\\d{4}年\\d{2}月\\d{1}日", "\\d{4}年\\d{1}月\\d{2}日","\\d{4}年\\d{1}月\\d{1}日","\\d{4}年\\d{2}月\\d{2}日\\s\\d{2}:\\d{2}:\\d{2}","\\d{4}年\\d{2}月\\d{2}日\\s\\d{2}:\\d{1}:\\d{2}","\\d{4}年\\d{1}月\\d{2}日\\s\\d{2}:\\d{1}:\\d{2}","\\d{4}年\\d{1}月\\d{2}日\\s\\d{2}:\\d{2}:\\d{2}","\\d{4}年\\d{2}月\\d{2}日\\d{2}:\\d{2}:\\d{2}","\\d{4}年\\d{2}月\\d{2}日\\s\\d{2}:\\d{2}","\\d{4}年\\d{2}月\\d{2}日\\s\\d{1}:\\d{2}","\\d{4}年\\d{1}月\\d{2}日\\s\\d{2}:\\d{2}","\\d{4}年\\d{1}月\\d{2}日\\s\\d{1}:\\d{2}","\\d{4}年\\d{2}月\\d{2}日\\d{2}:\\d{2}","\\d{4}年\\d{2}月\\d{2}日\\s\\d{2}","\\d{4}年\\d{2}月\\d{2}日\\s\\d{1}","\\d{4}年\\d{1}月\\d{2}日\\s\\d{2}","\\d{4}年\\d{1}月\\d{2}日\\s\\d{1}","\\d{4}年\\d{2}月\\d{2}日\\d{2}","\\d{4}-\\d{2}-\\d{2}\\s\\d{2}:\\d{2}:\\d{2}","\\d{4}-\\d{2}-\\d{2}\\s\\d{1}:\\d{2}:\\d{2}","\\d{4}-\\d{1}-\\d{2}\\s\\d{2}:\\d{2}:\\d{2}","\\d{4}-\\d{1}-\\d{2}\\s\\d{1}:\\d{2}:\\d{2}","\\d{4}-\\d{2}-\\d{2}\\s\\d{2}:\\d{2}","\\d{4}-\\d{2}-\\d{2}\\s\\d{1}:\\d{2}","\\d{4}-\\d{2}-\\d{2}\\s\\d{2}", "\\d{4}-\\d{2}-\\d{2}","\\d{4}-\\d{2}-\\d{1}", "\\d{4}-\\d{1}-\\d{2}","\\d{4}-\\d{1}-\\d{1}","\\d{4}-\\d{2}-\\d{2}\\s\\d{2}时\\d{2}分\\d{2}秒","\\d{4}-\\d{2}-\\d{2}\\s\\d{1}时\\d{2}分\\d{2}秒","\\d{4}-\\d{1}-\\d{2}\\s\\d{2}时\\d{2}分\\d{2}秒","\\d{4}-\\d{1}-\\d{2}\\s\\d{1}时\\d{2}分\\d{2}秒","\\d{4}-\\d{1}-\\d{1}\\s\\d{1}时\\d{2}分\\d{2}秒","\\d{4}-\\d{2}-\\d{2}\\s\\d{2}时\\d{2}分","\\d{4}-\\d{2}-\\d{2}\\s\\d{1}时\\d{2}分","\\d{4}-\\d{1}-\\d{2}\\s\\d{2}时\\d{2}分","\\d{4}-\\d{1}-\\d{2}\\s\\d{1}时\\d{2}分","\\d{4}-\\d{2}-\\d{2}\\s\\d{2}时","\\d{4}-\\d{2}-\\d{2}\\s\\d{1}时","\\d{4}-\\d{1}-\\d{2}\\s\\d{2}时","\\d{4}-\\d{1}-\\d{2}\\s\\d{1}时", "\\d{4}.\\d{2}.\\d{2}","\\d{4}.\\d{2}.\\d{1}", "\\d{4}.\\d{1}.\\d{2}","\\d{4}.\\d{1}.\\d{1}","\\d{4}.\\d{2}.\\d{2}\\s\\d{2}:\\d{2}:\\d{2}","\\d{4}.\\d{2}.\\d{2}\\s\\d{1}:\\d{2}:\\d{2}","\\d{4}.\\d{1}.\\d{2}\\s\\d{2}:\\d{2}:\\d{2}","\\d{4}.\\d{1}.\\d{2}\\s\\d{1}:\\d{2}:\\d{2}","\\d{4}.\\d{1}.\\d{1}\\s\\d{1}:\\d{2}:\\d{2}","\\d{4}.\\d{2}.\\d{2}\\s\\d{2}:\\d{2}","\\d{4}.\\d{2}.\\d{2}\\s\\d{1}:\\d{2}","\\d{4}.\\d{1}.\\d{2}\\s\\d{2}:\\d{2}","\\d{4}.\\d{1}.\\d{2}\\s\\d{1}:\\d{2}","\\d{4}.\\d{2}.\\d{2}\\s\\d{2}","\\d{4}.\\d{2}.\\d{2}\\s\\d{1}","\\d{4}.\\d{1}.\\d{2}\\s\\d{2}","\\d{4}.\\d{1}.\\d{2}\\s\\d{1}","\\d{4}/\\d{2}/\\d{2}\\s\\d{2}时\\d{2}分\\d{2}秒","\\d{4}/\\d{2}/\\d{2}\\s\\d{1}时\\d{2}分\\d{2}秒","\\d{4}/\\d{1}/\\d{2}\\s\\d{2}时\\d{2}分\\d{2}秒","\\d{4}/\\d{1}/\\d{2}\\s\\d{1}时\\d{2}分\\d{2}秒","\\d{4}/\\d{2}/\\d{2}\\s\\d{2}时\\d{2}分","\\d{4}/\\d{2}/\\d{2}\\s\\d{1}时\\d{2}分","\\d{4}/\\d{1}/\\d{2}\\s\\d{2}时\\d{2}分","\\d{4}/\\d{1}/\\d{2}\\s\\d{1}时\\d{2}分","\\d{4}/\\d{2}/\\d{2}\\s\\d{2}时","\\d{4}/\\d{2}/\\d{2}\\s\\d{1}时","\\d{4}/\\d{1}/\\d{2}\\s\\d{2}时","\\d{4}/\\d{1}/\\d{2}\\s\\d{1}时","\\d{4}/\\d{2}/\\d{2}","\\d{4}/\\d{2}/\\d{1}","\\d{4}/\\d{1}/\\d{2}","\\d{4}/\\d{1}/\\d{1}","\\d{4}/\\d{2}/\\d{2}\\s\\d{2}:\\d{2}:\\d{2}","\\d{4}/\\d{2}/\\d{2}\\s\\d{1}:\\d{2}:\\d{2}","\\d{4}/\\d{1}/\\d{2}\\s\\d{2}:\\d{2}:\\d{2}","\\d{4}/\\d{1}/\\d{2}\\s\\d{1}:\\d{2}:\\d{2}","\\d{4}/\\d{2}/\\d{2}\\s\\d{2}:\\d{2}","\\d{4}/\\d{2}/\\d{2}\\s\\d{1}:\\d{2}","\\d{4}/\\d{1}/\\d{2}\\s\\d{2}:\\d{2}","\\d{4}/\\d{1}/\\d{2}\\s\\d{1}:\\d{2}","\\d{4}/\\d{2}/\\d{2}\\s\\d{2}","\\d{4}/\\d{2}/\\d{2}\\s\\d{1}","\\d{4}/\\d{1}/\\d{2}\\s\\d{2}","\\d{4}/\\d{1}/\\d{2}\\s\\d{1}","\\d{2}月\\d{2}日\\s\\d{2}时\\d{2}分\\d{2}秒","\\d{2}月\\d{2}日\\s\\d{1}时\\d{2}分\\d{2}秒","\\d{1}月\\d{2}日\\s\\d{1}时\\d{2}分\\d{2}秒","\\d{1}月\\d{2}日\\s\\d{2}时\\d{2}分\\d{2}秒","\\d{2}月\\d{2}日\\d{2}时\\d{2}分\\d{2}秒","\\d{2}月\\d{2}日\\s\\d{2}时\\d{2}分","\\d{1}月\\d{2}日\\s\\d{2}时\\d{2}分","\\d{1}月\\d{2}日\\s\\d{1}时\\d{2}分","\\d{1}月\\d{2}日\\s\\d{2}时\\d{2}分","\\d{2}月\\d{2}日\\d{2}时\\d{2}分","\\d{2}月\\d{2}日\\s\\d{2}时","\\d{2}月\\d{2}日\\s\\d{1}时","\\d{1}月\\d{2}日\\s\\d{2}时","\\d{1}月\\d{2}日\\s\\d{1}时","\\d{2}月\\d{2}日\\d{2}时", "\\d{4}年\\d{2}月\\d{2}日","\\d{2}月\\d{1}日", "\\d{4}年\\d{1}月\\d{2}日","\\d{1}月\\d{1}日","\\d{2}月\\d{2}日\\s\\d{2}:\\d{2}:\\d{2}","\\d{2}月\\d{2}日\\s\\d{2}:\\d{1}:\\d{2}","\\d{1}月\\d{2}日\\s\\d{2}:\\d{1}:\\d{2}","\\d{1}月\\d{2}日\\s\\d{2}:\\d{2}:\\d{2}","\\d{2}月\\d{2}日\\d{2}:\\d{2}:\\d{2}","\\d{2}月\\d{2}日\\s\\d{2}:\\d{2}","\\d{2}月\\d{2}日\\s\\d{1}:\\d{2}","\\d{1}月\\d{2}日\\s\\d{2}:\\d{2}","\\d{1}月\\d{2}日\\s\\d{1}:\\d{2}","\\d{2}月\\d{2}日\\d{2}:\\d{2}","\\d{2}月\\d{2}日\\s\\d{2}","\\d{2}月\\d{2}日\\s\\d{1}","\\d{1}月\\d{2}日\\s\\d{2}","\\d{1}月\\d{2}日\\s\\d{1}","\\d{2}月\\d{2}日\\d{2}","\\d{2}-\\d{2}\\s\\d{2}:\\d{2}:\\d{2}","\\d{2}-\\d{2}\\s\\d{1}:\\d{2}:\\d{2}","\\d{1}-\\d{2}\\s\\d{2}:\\d{2}:\\d{2}","\\d{1}-\\d{2}\\s\\d{1}:\\d{2}:\\d{2}","\\d{2}-\\d{2}\\s\\d{2}:\\d{2}","\\d{2}-\\d{2}\\s\\d{1}:\\d{2}","\\d{2}-\\d{2}\\s\\d{2}", "\\d{4}-\\d{2}-\\d{2}","\\d{2}-\\d{1}", "\\d{4}-\\d{1}-\\d{2}","\\d{1}-\\d{1}","\\d{2}-\\d{2}\\s\\d{2}时\\d{2}分\\d{2}秒","\\d{2}-\\d{2}\\s\\d{1}时\\d{2}分\\d{2}秒","\\d{1}-\\d{2}\\s\\d{2}时\\d{2}分\\d{2}秒","\\d{1}-\\d{2}\\s\\d{1}时\\d{2}分\\d{2}秒","\\d{1}-\\d{1}\\s\\d{1}时\\d{2}分\\d{2}秒","\\d{2}-\\d{2}\\s\\d{2}时\\d{2}分","\\d{2}-\\d{2}\\s\\d{1}时\\d{2}分","\\d{1}-\\d{2}\\s\\d{2}时\\d{2}分","\\d{1}-\\d{2}\\s\\d{1}时\\d{2}分","\\d{2}-\\d{2}\\s\\d{2}时","\\d{2}-\\d{2}\\s\\d{1}时","\\d{1}-\\d{2}\\s\\d{2}时","\\d{1}-\\d{2}\\s\\d{1}时", "\\d{4}.\\d{2}.\\d{2}","\\d{2}.\\d{1}", "\\d{4}.\\d{1}.\\d{2}","\\d{1}.\\d{1}","\\d{2}.\\d{2}\\s\\d{2}:\\d{2}:\\d{2}","\\d{2}.\\d{2}\\s\\d{1}:\\d{2}:\\d{2}","\\d{1}.\\d{2}\\s\\d{2}:\\d{2}:\\d{2}","\\d{1}.\\d{2}\\s\\d{1}:\\d{2}:\\d{2}","\\d{1}.\\d{1}\\s\\d{1}:\\d{2}:\\d{2}","\\d{2}.\\d{2}\\s\\d{2}:\\d{2}","\\d{2}.\\d{2}\\s\\d{1}:\\d{2}","\\d{1}.\\d{2}\\s\\d{2}:\\d{2}","\\d{1}.\\d{2}\\s\\d{1}:\\d{2}","\\d{2}.\\d{2}\\s\\d{2}","\\d{2}.\\d{2}\\s\\d{1}","\\d{1}.\\d{2}\\s\\d{2}","\\d{1}.\\d{2}\\s\\d{1}","\\d{2}/\\d{2}\\s\\d{2}时\\d{2}分\\d{2}秒","\\d{2}/\\d{2}\\s\\d{1}时\\d{2}分\\d{2}秒","\\d{1}/\\d{2}\\s\\d{2}时\\d{2}分\\d{2}秒","\\d{1}/\\d{2}\\s\\d{1}时\\d{2}分\\d{2}秒","\\d{2}/\\d{2}\\s\\d{2}时\\d{2}分","\\d{2}/\\d{2}\\s\\d{1}时\\d{2}分","\\d{1}/\\d{2}\\s\\d{2}时\\d{2}分","\\d{1}/\\d{2}\\s\\d{1}时\\d{2}分","\\d{2}/\\d{2}\\s\\d{2}时","\\d{2}/\\d{2}\\s\\d{1}时","\\d{1}/\\d{2}\\s\\d{2}时","\\d{1}/\\d{2}\\s\\d{1}时","\\d{2}/\\d{2}","\\d{2}/\\d{1}","\\d{1}/\\d{2}","\\d{1}/\\d{1}","\\d{2}/\\d{2}\\s\\d{2}:\\d{2}:\\d{2}","\\d{2}/\\d{2}\\s\\d{1}:\\d{2}:\\d{2}","\\d{1}/\\d{2}\\s\\d{2}:\\d{2}:\\d{2}","\\d{1}/\\d{2}\\s\\d{1}:\\d{2}:\\d{2}","\\d{2}/\\d{2}\\s\\d{2}:\\d{2}","\\d{2}/\\d{2}\\s\\d{1}:\\d{2}","\\d{1}/\\d{2}\\s\\d{2}:\\d{2}","\\d{1}/\\d{2}\\s\\d{1}:\\d{2}","\\d{2}/\\d{2}\\s\\d{2}","\\d{2}/\\d{2}\\s\\d{1}","\\d{1}/\\d{2}\\s\\d{2}","\\d{1}/\\d{2}\\s\\d{1}",}; String str = ""; Date date = null; for (String reg : regs) {String temp = match(reg, stringTime); if (temp.length() > str.length()) {str = temp; if (!"".equals(str)) {date = formatDate(str); }}}return date; } /**** @Description: 把String格式的时间转化为date* @param stringTime* @return:* @throws*/ public static Date formatDate(String stringTime) {Date date = null; if (StringUtils.isNotBlank(stringTime)) {String[] pattern = new String[] { "yyyy年MM月dd日HH时mm分ss秒","yyyy年MM月dd日 HH时mm分ss秒", "yyyy年MM月dd日HH时mm分","yyyy年MM月dd日 HH时mm分", "yyyy年MM月dd日 HH时", "yyyy年MM月dd日HH时","yyyy年MM月dd日", "yyyy年MM月dd日HH:mm:ss","yyyy年MM月dd日 HH:mm:ss", "yyyy年MM月dd日HH:mm","yyyy年MM月dd日 HH:mm", "yyyy年MM月dd日 HH", "yyyy年MM月dd日HH","yyyy-MM-dd HH时mm分ss秒", "yyyy-MM-dd HH时mm分","yyyy-MM-dd HH时", "yyyy-MM-dd", "yyyy-MM-dd HH:mm:ss","yyyy-MM-dd HH:mm", "yyyy-MM-dd HH","yyyy/MM/dd HH时mm分ss秒", "yyyy/MM/dd HH时mm分","yyyy/MM/dd HH时", "yyyy/MM/dd", "yyyy/MM/dd HH:mm:ss","yyyy/MM/dd HH:mm", "yyyy/MM/dd HH", "yyyy.MM.dd HH:mm:ss","yyyy.MM.dd HH:mm", "yyyy.MM.dd HH", "yyyy.MM.dd","yyyyMMdd", }; try {date = DateUtils.parseDate(stringTime, pattern); } catch (ParseException e) {e.printStackTrace(); }}return date; } public static String match(String reg, String stringTime) {Pattern p = Pattern.compile(reg); Matcher m = p.matcher(stringTime); String s = ""; if (m.find()) {s += m.group(); }return s; } /*** 格式化* @Title: DateToString* @Description:* @param time* @return:* @throws*/ public static String DateToString(Date time) {String newDate = DateFormatUtils.format(time,"yyyy-MM-dd HH:mm:ss"); return newDate; } public static void main(String[] args) {String stringTime = "PDFS(iZh9k5gurgwcwpZ) 2020-01-01 21:27:36.560 >订单编号:1112233提交订单成功!跟踪号:待取跟踪号内部单号:2342244"; Date date = cutDate(stringTime); System.out.println(date); System.out.println(DateToString(date)); }}

我们测试一下：

文章图片

没问题的。

从字符串中提取年份，要求输出1000-4999之间的所有年份
正则表达式
常用正则表达式：

\d : 数字字符匹配。等效于 [0-9]
\D : 非数字字符匹配。等效于 [^0-9]。
{n} : n为非负整数，正好匹配n次
{n,} : n为非负整数，至少匹配n次
[a-z]: 字符范围。匹配指定范围内的任何字符,例如，"[a-z]"匹配"a"到"z"范围内的任何小写字母。
[^a-z]: 反向范围字符。匹配不在指定的范围内的任何字符。例如，"[^a-z]"匹配任何不在"a"到"z"范围内的任何字符。
\ : 将下一字符标记为特殊字符、文本、反向引用或八进制转义符
^ : 匹配输入字符串开始的位置
$ : 匹配输入字符串结尾的位置。
* : 零次或多次匹配前面的字符或子表达式。例如，zo* 匹配"z"和"zoo"。* 等效于 {0,}
+: 一次或多次匹配前面的字符或子表达式。例如，"zo+"与"zo"和"zoo"匹配，但与"z"不匹配。+ 等效于 {1,}。
?: 零次或一次匹配前面的字符或子表达式。例如，"do(es)?"匹配"do"或"does"中的"do"。? 等效于 {0,1}。

import java.util.*; import java.util.regex.Matcher; import java.util.regex.Pattern; public class JingDong {public static void main(String[] args) {Scanner sc = new Scanner(System.in); String str = sc.nextLine(); String reg = "\\D[1-4]\\d{3}\\D"; //eg：a2019a、a2019、2019a// 前面不能是数字，后面也不能是数字str = str +"a"; str = "a" + str; Pattern p = Pattern.compile(reg); Matcher matcher = p.matcher(str); while(matcher.find()){System.out.print(matcher.group(0).substring(1,5) + " "); }}public static boolean isNum(char a){if(Character.isDigit(a)){return true; }elsereturn false; }}

传统匹配：

import java.util.*; public class JingDong {public static void main(String[] args) {Scanner sc = new Scanner(System.in); String str = sc.nextLine(); if(str.length()<=2000){String out = ""; for (int i = 0; i < str.length()-1; ) {if(isNum(str.charAt(i) )&& Integer.parseInt(String.valueOf(str.charAt(i))) <=4 && Integer.parseInt(String.valueOf(str.charAt(i)))>=1){if(isNum(str.charAt(i+1))){if(isNum(str.charAt(i+2))){if(isNum(str.charAt(i+3))){if (!isNum(str.charAt(i+4))){out += str.substring(i,i+4); out += " "; i+=4; }i+=4; }elsei++; }elsei++; }elsei++; }elsei++; }System.out.println(out); }public static boolean isNum(char a){if(Character.isDigit(a)){return true; }elsereturn false; }}

【java|java 如何从字符串里面提取时间】以上为个人经验，希望能给大家一个参考，也希望大家多多支持脚本之家。