如果属性为Integer，则Spring @Value始终会给出错误 [英] Spring @Value always gives an error if property is Integer

问题描述

我正在使用sprin版本4.3.8.RELEASE.我也正在使用 @Value 从属性文件注入值，如果属性是字符串，那没问题，但是如果属性是 Integer ，那是一个问题(我知道有很多问题，我尝试了所有答案，但问题仍然存在)

I am using sprin version 4.3.8.RELEASE. also i am using @Value to inject values from property file, if the properties are string that no problem, but if the property is Integer that is a problem (i know there is many questions about this i tried all the answers but the issue still exist)

该属性是

CONNECTION.TIME.OUT=100000

第一个解决方案

@Value("${CONNECTION.TIME.OUT}")
protected Integer connectionTimeOut;

Ecxeption

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

第二个解决方案

@Value("#{new Integer('${CONNECTION.TIME.OUT}')}")
protected Integer connectionTimeOut;

例外

EL1003E: A problem occurred whilst attempting to construct an object of type 'Integer' using arguments '(java.lang.String)'

第三种解决方案

@Value("#{new Integer.parseInteger('${CONNECTION.TIME.OUT}')}")
protected Integer connectionTimeOut;

例外

EL1003E: A problem occurred whilst attempting to construct an object of type 'Integer' using arguments '(java.lang.String)'

这是为什么的任何想法

推荐答案

对于 @Value("$ {CONNECTION.TIME.OUT}")，您的错误是 java.lang.NumberFormatException:对于输入字符串:"$ {CONNECTION.TIME.OUT}" .这意味着未处理表达式会导致 Integer.parseInt("$ {CONNECTION.TIME.OUT}")引发 NumberFormatException .

For @Value("${CONNECTION.TIME.OUT}") your error is java.lang.NumberFormatException: For input string: "${CONNECTION.TIME.OUT}". This means that expression was not processed resulting in Integer.parseInt("${CONNECTION.TIME.OUT}") which thrown the NumberFormatException.

在Spring上下文中没有注册 PropertyPlaceholderConfigurer bean，并且未处理 @Value 批注，或者没有属性 CONNECTION.TIME.OUT .

Either there is no PropertyPlaceholderConfigurer bean registered in the Spring context and @Value annotations are not processed or there is no property CONNECTION.TIME.OUT defined.

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