反射获取字段的值与非空校验

获取指定字段的值

// 通过字段对应的get方法

public Object getFieldValueByName1(String fieldName, Object obj) {
    try {
        String firstLetter = fieldName.substring(0, 1).toUpperCase();
        String getter = "get" + firstLetter + fieldName.substring(1);
        Method method = obj.getClass().getMethod(getter, new Class[] {});
        Object value = method.invoke(obj, new Object[] {});
        return value;
    } catch (Exception e) {
        return null;
    }
}


// 通过字段
public Object getFieldValueByName(String fieldName, Object obj) {
    try {
        Field field = obj.getClass().getDeclaredField(fieldName);
        field.setAccessible(true);
        Object value = field.get(obj);
        return value;
    } catch (Exception e) {
        e.printStackTrace();
        return null;
    }
}

非空判断，对请求参数中对象的值进行非空校验

private void emptyValid(Object obj) {
    try