如何設置一個只要十六進制在Spring XML配置

Question

我試圖做這樣的事情：

<bean id="myBean" class="com.example.SomeThing"> 
    <property name="longValue"> 
     <bean class="java.lang.Long"> 
      <constructor-arg value="0x0418a14372d4186eL" type="long"/> 
     </bean> 
    </property> 
</bean> 

但是這會導致以下異常：

Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'java.lang.Long#19190b75' defined in file [/apollo/env/path/to/config.xml]: Unsatisfied dependency expressed through constructor argument with index 0 of type [java.lang.String]: Ambiguous constructor argument types - did you specify the correct bean references as constructor arguments? 

Answer 1

我想你想factory-method參數<bean>：

<bean id="myBean" class="com.example.SomeThing"> 
    <property name="longValue"> 
     <bean class="java.lang.Long" factory-method="decode"> 
      <constructor-arg value="0x0418a14372d4186" /> 
     </bean> 
    </property> 
</bean> 

（注缺少了 「L」 後綴的。）

Answer 2

SPEL應該工作

<bean id="myBean" class="com.example.SomeThing"> 
    <property name="longValue" value="#{0x0418a14372d4186eL}" /> 
</bean> 

Answer 3

你可以使用Java @Configuration？

@Configuration 
public class Config { 

    @Bean 
    public SomeThing someThing() { 
     final SomeThing bean = new SomeThing(); 
     bean.set(Long.parseLong("0418a14372d4186e", 16)); 
     return bean; 
    } 

}