java Spring MVC：@Value 注释以获取在 *.properties 文件中定义的 int 值
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Spring MVC: @Value annotation to get int value defined in *.properties file
提问by zccoding
I have a config.properties file:
我有一个 config.properties 文件：
limit=10
My springmvc-servlet.xml:
我的 springmvc-servlet.xml：
<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="locations">
<list>
<value>classpath:config/config.properties</value>
</list>
</property>
</bean>
This is my controller class:
这是我的控制器类：
@Controller
@RequestMapping(...)
public class Test extends BaseController
{
@Value("${limit}") Integer limit; // This doesn't work
@Value("#{T(java.lang.Integer).parseInt(${limit})}") Integer limit; // This also doesn't work
@RequestMapping(...)
@ResponseBody
public String session()
{
return String.valueOf(limit);
}
}
error message is:
错误信息是：
Error creating bean with name 'test': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: java.lang.Integer **.Test.limit; nested exception is org.springframework.beans.factory.BeanExpressionException: Expression parsing failed; nested exception is org.springframework.expression.spel.SpelParseException: EL1043E:(pos 31): Unexpected token. Expected 'rparen())' but was 'lcurly({)'
any ideas?
有任何想法吗？
回答by Timothy Jeffcoat
Try the following:
请尝试以下操作：
@Value("#{config.limit}") Integer limit;
Documentation at http://docs.spring.io/spring/docs/3.0.x/spring-framework-reference/html/new-in-3.html
http://docs.spring.io/spring/docs/3.0.x/spring-framework-reference/html/new-in-3.html 上的文档
Example given there is:
给出的例子是：
@Repository
public class RewardsTestDatabase {
@Value("#{systemProperties.databaseName}")
public void setDatabaseName(String dbName) { … }
@Value("#{strategyBean.databaseKeyGenerator}")
public void setKeyGenerator(KeyGenerator kg) { … }
}
UPDATE: I tested and had same problem. Figured it out by following instructions at How can I inject a property value into an annotation configured spring mvc 3.0 controller
更新：我测试并遇到了同样的问题。按照如何将属性值注入到注释配置的 spring mvc 3.0 控制器中的说明进行计算
回答by Ravi Jiyani
In your code :
在您的代码中：
<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="locations">
<list>
<value>classpath:config/config.properties</value>
</list>
</property>
</bean>
classpath refers to WEB-INF/classes path inside war file. So do you have config folder inside WEB-INF/classes ?
classpath 是指 war 文件中的 WEB-INF/classes 路径。那么您在 WEB-INF/classes 中有 config 文件夹吗？
If yes then check using xml based configuration as below :
如果是，则使用基于 xml 的配置进行检查，如下所示：
<bean id="dataSource" class="org.tempuri.DataBeanClass">
<property name="url" value="${url}"></property>
</bean>
If still you are getting an error then there is sure issue with property file loading.
如果仍然出现错误，则属性文件加载肯定有问题。
回答by Satya
try this : @Value("#{new Integer('${limit}')}")
试试这个 ： @Value("#{new Integer('${limit}')}")
and
和
<context:property-placeholder location="config/config.properties" />
