Question

我想从属性文件中读取Spring bean定义中的参数值。可能吗？

示例： persistanceUnit arg的值，在下面的bean定义中我需要从属性文件中读取或以某种方式配置。

<bean id="profileDao" class="com.sample.dao.kundera.GenericKunderaDaoImpl">
              <constructor-arg name="persistanceUnit" type="java.lang.String" value="cds_test_pu"/>
              <constructor-arg name="persistentClass" type="java.lang.Class" value="com.sample.model.cds.Profile"/>
</bean>

Answer 1

如果spring已经获取了您的属性文件，您可以使用表达式来引用该属性：

   <div class="table-responsive">
    <nav ng-if="filterOn" class="navbar navbar-default">
        <form class="navbar-form">
 <div class="show-grid">
            <span class="input-group col-xs-4 col-md-4"> <span class="input-group-addon">Filter: </span>

                <input ng-model="filterOptions.filterText" class="form-control">
            </span>
            <span class="input-group col-xs-4 col-md-4"> <span class="input-group-addon" style="width: 20%">Filter A: </span>

                <select class="form-control" name="mySelect1" ng-model="sel1">
                    <option></option>
                    <option>{{selections}}</option>
                </select>
            </span>
            <span class="input-group col-xs-4 col-md-4"> <span class="input-group-addon">Filter B: </span>

                <select class="form-control" name="mySelect2" ng-model="nameVarTo">
                    <option></option>
                    <option>selections2</option>
                </select>
            </span>
  </div>
        </form>
    </nav>
</div>

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引用配置文件

<bean id="profileDao" class="com.sample.dao.kundera.GenericKunderaDaoImpl">
              <constructor-arg name="persistanceUnit" type="java.lang.String" value="${cds_test_pu}"/>
              <constructor-arg name="persistentClass" type="java.lang.Class" value="com.sample.model.cds.Profile"/>
</bean>

Spring boot有很多关于配置外部化的功能 - 请看这里： http://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#boot-features-external-config

Answer 2

添加

您还可以使用Spring表达式语言SPEL在xml中的bean定义中动态解析值。
您还可以在应用程序启动时以编程方式将BeanDefinition注册到Spring BeanDefinitionRegistry。

我们可以动态地将值传递给Spring bean定义的参数吗？

2 个答案: