java 工具类（时间格式字符串截取年月）

比眉伴天荒 2023-10-16 22:13 45阅读 0赞

public String getYear(String content) {
    		String year = null;
    		if(content!=null){
    			//正则表达式
    			String pat = "\\d{4}-\\d{2}-\\d{2} \\d{2}:\\d{2}:\\d{2}";
    			Pattern pattern = Pattern.compile(pat) ;      // 实例化Pattern类
    		        Matcher m = pattern.matcher(content) ;    // 实例化Matcher类
    		        if(m.matches()){        				  // 进行验证的匹配，使用正则
    		        	SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    					Date date = null;
    					try {
    						date = format.parse(content);
    						Calendar   cal   =   Calendar.getInstance();   
    						cal.setTime(date); 
    						year=""+cal.get(Calendar.YEAR);
    					} catch (ParseException e) {
    						e.printStackTrace();
    					}
    		        }
    		
    		}
    		
    		return year;
    	}	
    	public String getMonth(String content){
    		String month=null;
    		if(content!=null){
    			//正则表达式
    			String pat = "\\d{4}-\\d{2}-\\d{2} \\d{2}:\\d{2}:\\d{2}";
    			Pattern pattern = Pattern.compile(pat) ;      // 实例化Pattern类
    		        Matcher m = pattern.matcher(content) ;    // 实例化Matcher类
    		        if(m.matches()){        				  // 进行验证的匹配，使用正则
    		        	SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    					Date date = null;
    					try {
    						date = format.parse(content);
    						Calendar   cal   =   Calendar.getInstance();   
    						cal.setTime(date); 
    						int num=cal.get(Calendar.MONTH)+1;
    						month=""+num;
    					} catch (ParseException e) {
    						e.printStackTrace();
    					}
    		        }
    		
    		}
    		
    		return month;
    	}
    	
    	public static void main(String[] args){
    		KmsMultidocKnowledgeIntegralStatisticsServiceImpl test=new KmsMultidocKnowledgeIntegralStatisticsServiceImpl();
    		System.out.println("month is："+test.getMonth("2015-08-03 10:44:15"));
    		System.out.println("year is："+test.getYear("2015-08-03 10:44:15"));
    	}