实体类的基本数据类型一定要用它对应的包装类,int都知道用Integer,比如double就容易忘记,页面传递值的时候就会报错
Failed to convert property value of type 'java.lang.String' to required type 'double' for property 'cost'
Failed to convert property value of type 'java.lang.String' to required type 'double' for property 'cost'