java - 使用spring的@Value注解出错

Question

容器启动的时候出错

配置文件如下:

报错信息如下:

<code>org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'communityController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private int cn.wanjubang.toy.core.controller.Basecontroller.maxPic; nested exception is org.springframework.beans.TypeMismatchException: Failed to convert value of type 'java.lang.String' to required type 'int'; nested exception is java.lang.NumberFormatException: For input string: "${maxPic}"

Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private int cn.wanjubang.toy.core.controller.Basecontroller.maxPic; nested exception is org.springframework.beans.TypeMismatchException: Failed to convert value of type 'java.lang.String' to required type 'int'; nested exception is java.lang.NumberFormatException: For input string: "${maxPic}"
</code>

怎么解决呢?

Answer 1

1.这个首先确保下，你的properties位置没有错，如果你是跑单测时候，最好确保在test的路径下也有。

2.如果确认配置文件是OK的，spring会有一个工具类NumberUtils来处理。

<code>            return (T) (isHexNumber(trimmed) ? Byte.decode(trimmed) : Byte.valueOf(trimmed));
        }
        else if (targetClass.equals(Short.class)) {
            return (T) (isHexNumber(trimmed) ? Short.decode(trimmed) : Short.valueOf(trimmed));
        }
        else if (targetClass.equals(Integer.class)) {
            return (T) (isHexNumber(trimmed) ? Integer.decode(trimmed) : Integer.valueOf(trimmed));
        }</code>

会把string转换成Intger类型，如果还是不行的话，可以试试用SPEL语句，来强制转换

<code>"#{T(java.lang.Integer).parseInt('${maxPic}')}"</code>

Answer 2

Failed to convert value of type 'java.lang.String' to required type 'int'; nested exception is java.lang.NumberFormatException: For input string: "${maxPic}"

这个报错这么明显。。。init bean的时候spring自动转换赋值macPic参数，但是String 转int 异常了

Answer 3

exception is java.lang.NumberFormatException: For input string: "${maxPic}"，你是不是写的maxPic加了引号报错了

Answer 4

int 换成String
private　String maxPic.