Java基础系列之正则表达式

客官°小女子只卖身不卖艺 2022-07-21 11:13 187阅读 0赞

Java在处理一些复杂的字符串操作时，往往不是通过String中函数实现的，而是通过Java中正则表达式实现的。

下面通过一个具体的例子简单的介绍一下Java中正则表达式具体的用法。

package myapi.regex.demo;
    public interface RegularInterface {
    	public boolean checkDigit(String input);
    	public boolean checkMail(String input);
    	public boolean checkPhone(String input);
    	public boolean checkIDCard(String input);
    	public boolean checkDate(String input);
    	public boolean checkDateTime(String input);
    }
    
    package myapi.regex.demo;
    import java.util.Calendar;
    import java.util.HashMap;
    import java.util.Map;
    import java.util.regex.Matcher;
    import java.util.regex.Pattern;
    
    import myapi.time.demo.JavaTimeApi;
    public class MyRegexApi implements RegularInterface {
    	public MyRegexApi() {
    		
    	}
    	private static Map<String,String>map=new HashMap<String,String>();
    	static{
    		map.put("11","北京");map.put("12","天津");map.put("13","河北");map.put("14","山西");map.put("15","内蒙古");
    		map.put("21","辽宁");map.put("22","吉林");map.put("23","黑龙江");map.put("31","上海");map.put("32","江苏");
    		map.put("33","浙江");map.put("34","安徽");map.put("35","福建");map.put("36","江西");map.put("37","山东");
    		map.put("41","河南");map.put("42","湖北");map.put("43","湖南");map.put("44","广东");map.put("45","广西");
    		map.put("46","海南");map.put("50","重庆");map.put("51","四川");map.put("52","贵州");map.put("53","云南");
    		map.put("54","西藏");map.put("61","陕西");map.put("62","甘肃");map.put("63","青海");map.put("64","宁夏");
    		map.put("65","新疆");map.put("71","台湾");map.put("81","香港");map.put("82","澳门");map.put("91","国外");
    	}
    	public static void main(String[] args) {
    		MyRegexApi m = new MyRegexApi();
    		System.out.println(m.checkIDCard("340822198007265519"));
    	}
    
    	/**
    	 * @author qiang
    	 * @param input
    	 *            输入条件
    	 * @return boolean 判断输入条件是否是数字，是返回true，不是返回false
    	 */
    	@Override
    	public boolean checkDigit(String input) {
    		Pattern p = Pattern.compile("^[0-9]{1,20}$");
    		Matcher m = p.matcher(input);
    		return m.matches();
    	}
    
    	@Override
    	public boolean checkMail(String input) {
    		Pattern p = Pattern
    				.compile("^([a-zA-Z0-9_\\.\\-])+\\@(([a-zA-Z0-9\\-])+\\.)+([a-zA-Z0-9]{2,4})+$");
    		Matcher m = p.matcher(input);
    		return m.matches();
    	}
    
    	@Override
    	public boolean checkPhone(String input) {
    		Pattern p = Pattern.compile("^1[3|4|5|7|8]\\d{9}$");
    		Matcher m = p.matcher(input);
    		return m.matches();
    	}
    
    	@Override
    	public boolean checkIDCard(String input) {
    		boolean flags[]={checkIDCard_specification(input),checkIDCard_Province(input),
    			checkIDCard_checkBirthday(input),checkIDCard_checkParity(input)};
    		for(int i=0;i<flags.length;i++){
    			if(flags[i]==false){
    				return false;
    			}
    		}
    		return true;
    	}
    
    	public boolean checkIDCard_specification(String input){
    		Pattern p = Pattern.compile("(^\\d{15}$)|(^\\d{17}(\\d|X)$)");
    		Matcher m = p.matcher(input);
    		return m.matches();
    	}
    	
    	public boolean checkIDCard_Province(String input){
    		if(map.get(input.substring(0,2))!=null && map.containsKey(input.substring(0,2))){
    			return true;
    		}else{
    			return false;
    		}
    	}
    	
    	public boolean checkIDCard_checkBirthday(String input){
    		Pattern p=null;
    		Matcher m=null;
    		if(input.length()==15){
    			 p = Pattern.compile("^(\\d{6})(\\d{2})(\\d{2})(\\d{2})(\\d{3})$");
    			 m = p.matcher(input);
    			 if(m.matches()){
    				 int year=Integer.valueOf("19"+input.substring(6, 8));
    				 int month=Integer.valueOf(input.substring(8, 10));
    				 int day=Integer.valueOf(input.substring(10, 12));
    				 return checkIDCard_Birthday(year,month,day);
    			 }else{
    				 return false;
    			 }
    			
    		}else if(input.length()==18){
    			 p = Pattern.compile("^(\\d{6})(\\d{4})(\\d{2})(\\d{2})(\\d{3})([0-9]|X)$");
    			 m = p.matcher(input);
    			 if(m.matches()){
    				 int year=Integer.valueOf(input.substring(6, 10));
    				 int month=Integer.valueOf(input.substring(10, 12));
    				 int day=Integer.valueOf(input.substring(12, 14));
    				 return checkIDCard_Birthday(year,month,day);
    			 }else{
    				 return false;
    			 }
    		}else{
    			return false;
    		}
    	}
    	
    	public boolean checkIDCard_Birthday(int year,int month,int day){
    		Calendar cal = Calendar.getInstance();
    		int lastDay=JavaTimeApi.getLastDayOfMonth(year, month);
    		int currentYear=cal.get(Calendar.YEAR);
    		if((currentYear-year<3) || (currentYear-year>101)){
    			return false;
    		}else if(month<1 || month>12){
    			return false;
    		}else if(day<1 || day>lastDay){
    			return false;
    		}
    		return true;
    	}
    	
    	public boolean checkIDCard_checkParity(String input){
    		if(input.length()==15){
    			input=checkIDCard_changeNumber(input);
    		}
    		int arrInt[] = {7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2}; 
    		char arrCh[] = {'1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2'};
    		int cartTemp=0,valnum=0;
    		for(int i = 0; i < 17; i ++){
    			cartTemp+=Integer.valueOf(input.charAt(i)+"")*arrInt[i];
    		}
    		valnum=arrCh[cartTemp%11];
    		if(valnum==input.charAt(17)){
    			return true;
    		}else{
    			return false;
    		}
    	}
    	
    	public String checkIDCard_changeNumber(String input){
    		int arrInt[] = {7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2}; 
    		char arrCh[] = {'1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2'};
    		String obj=input.substring(0, 6)+"19"+input.substring(6, input.length());
    		int cartTemp=0;
    		for(int i = 0; i < 17; i ++){
    			cartTemp+=Integer.valueOf(input.charAt(i))*arrInt[i];
    		}
    		obj+=arrCh[cartTemp%11];
    		return obj;
    	}
    	@Override
    	public boolean checkDate(String input) {
    		Pattern p = Pattern
    				.compile("((^((1[8-9]\\d{2})|([2-9]\\d{3}))([-\\/\\._])(10|12|0?[13578])([-\\/\\._])(3[01]|[12][0-9]|0?[1-9])$)|(^((1[8-9]\\d{2})|([2-9]\\d{3}))([-\\/\\._])(11|0?[469])([-\\/\\._])(30|[12][0-9]|0?[1-9])$)|(^((1[8-9]\\d{2})|([2-9]\\d{3}))([-\\/\\._])(0?2)([-\\/\\._])(2[0-8]|1[0-9]|0?[1-9])$)|(^([2468][048]00)([-\\/\\._])(0?2)([-\\/\\._])(29)$)|(^([3579][26]00)([-\\/\\._])(0?2)([-\\/\\._])(29)$)|(^([1][89][0][48])([-\\/\\._])(0?2)([-\\/\\._])(29)$)|(^([2-9][0-9][0][48])([-\\/\\._])(0?2)([-\\/\\._])(29)$)|(^([1][89][2468][048])([-\\/\\._])(0?2)([-\\/\\._])(29)$)|(^([2-9][0-9][2468][048])([-\\/\\._])(0?2)([-\\/\\._])(29)$)|(^([1][89][13579][26])([-\\/\\._])(0?2)([-\\/\\._])(29)$)|(^([2-9][0-9][13579][26])([-\\/\\._])(0?2)([-\\/\\._])(29)$))");
    		Matcher m = p.matcher(input);
    		return m.matches();
    	}
    
    	@Override
    	public boolean checkDateTime(String input) {
    		if(input.split(" ").length!=2){
    			return false;
    		}
    		String datas=input.split(" ")[0];
    		String times=input.split(" ")[1];
    		Pattern p_datas = Pattern.compile("((^((1[8-9]\\d{2})|([2-9]\\d{3}))([-\\/\\._])(10|12|0?[13578])([-\\/\\._])(3[01]|[12][0-9]|0?[1-9])$)|(^((1[8-9]\\d{2})|([2-9]\\d{3}))([-\\/\\._])(11|0?[469])([-\\/\\._])(30|[12][0-9]|0?[1-9])$)|(^((1[8-9]\\d{2})|([2-9]\\d{3}))([-\\/\\._])(0?2)([-\\/\\._])(2[0-8]|1[0-9]|0?[1-9])$)|(^([2468][048]00)([-\\/\\._])(0?2)([-\\/\\._])(29)$)|(^([3579][26]00)([-\\/\\._])(0?2)([-\\/\\._])(29)$)|(^([1][89][0][48])([-\\/\\._])(0?2)([-\\/\\._])(29)$)|(^([2-9][0-9][0][48])([-\\/\\._])(0?2)([-\\/\\._])(29)$)|(^([1][89][2468][048])([-\\/\\._])(0?2)([-\\/\\._])(29)$)|(^([2-9][0-9][2468][048])([-\\/\\._])(0?2)([-\\/\\._])(29)$)|(^([1][89][13579][26])([-\\/\\._])(0?2)([-\\/\\._])(29)$)|(^([2-9][0-9][13579][26])([-\\/\\._])(0?2)([-\\/\\._])(29)$))");
    		Matcher m_datas = p_datas.matcher(datas);
    		Pattern p_times = Pattern.compile("^(([01]?[0-9])|(2[0-3])):[0-5]?[0-9]:[0-5]?[0-9]$");
    		Matcher m_times = p_times.matcher(times);
    		if(m_datas.matches() && m_times.matches()){
    			return true;
    		}else{
    			return false;
    		}
    	}
    }

上面的例子详细的介绍了，在Java中如何通过使用正则表达式进行电话号码，身份证，日期，数字，邮箱，URL等的验证。