Summary of regular verification frequently used in Java development-javaTutorial-php.cn

Summary of regular verification frequently used in Java development

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Release： 2018-07-23 10:32:59

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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;
    }

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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;
    }

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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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to the URL.

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