java - Spring @Value TypeMismatchException :Failed to convert value of type 'java.lang.String' to required type 'java.lang.Double'

Question

我想用@Value注解注入(inject)一个Double属性如:

@Service
public class MyService {

    @Value("${item.priceFactor}")
    private Double priceFactor = 0.1;

// ...

并使用 Spring 属性占位符(属性文件):

item.priceFactor=0.1

我得到异常:

org.springframework.beans.TypeMismatchException: Failed to convert value of type 'java.lang.String' to required type 'java.lang.Double'; nested exception is java.lang.NumberFormatException: For input string: "${item.priceFactor}"

有没有办法使用来自属性文件的 Double 值？

Answer 1

尝试更改以下行

@Value("${item.priceFactor}")

到

@Value("#{new Double('${item.priceFactor}')}")