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获取字段 java, reflection 
    public static Field getField(Class<?> clazz, String fieldName) {
        try {
            return clazz.getDeclaredField(fieldName);
        } catch (Exception e) {
            return null;
        }
    }
获取默认构造函数 java, reflection 
public static Constructor<?> getDefaultConstructor(Class<?> clazz) {
        if (Modifier.isAbstract(clazz.getModifiers())) {
            return null;
        }

        Constructor<?> defaultConstructor = null;
        for (Constructor<?> constructor : clazz.getDeclaredConstructors()) {
            if (constructor.getParameterTypes().length == 0) {
                defaultConstructor = constructor;
                break;
            }
        }
        
        if (defaultConstructor == null) {
            if (clazz.isMemberClass() && !Modifier.isStatic(clazz.getModifiers())) {
                for (Constructor<?> constructor : clazz.getDeclaredConstructors()) {
                    if (constructor.getParameterTypes().length == 1 && constructor.getParameterTypes()[0].equals(clazz.getDeclaringClass())) {
                        defaultConstructor = constructor;
                        break;
                    }
                }
            }
        }
        
        return defaultConstructor;
    }
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