Summary of regular verification frequently used in Java development

This article mainly summarizes the commonly used regular verification in Java

1. Mobile phone number verification

public static boolean isMobile(String str) { Pattern p; Matcher m; boolean b; p = Pattern.compile("^[1][3,4,5,6,7,8,9][0-9]{9}$"); // 验证手机号 m = p.matcher(str); b = m.matches(); return b; }

2. Determine whether the obj object attributes are empty. If they are all empty, If it is not empty, it will return false

public static boolean checkFieldValueNull(Object obj){ Class clazz = obj.getClass(); for(; clazz != Object.class ; clazz = clazz.getSuperclass()) { Field[] fields=clazz.getDeclaredFields(); for(Field field:fields){ try { field.setAccessible(true); if("serialVersionUID".equals(field.getName())){ continue; } if (field.get(obj) != null) {//判断字段是否为空，并且对象属性中的基本都会转为对象类型来判断 return false; } } catch (IllegalAccessException e) { e.printStackTrace(); } } } return true; }

3. Determine whether the URL contains http://. If not, it will automatically add

url = url.substr(0,7).toLowerCase() == "http://" ? url : "http://" + url;

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