春季注入地图问题答案

【问题标题】：Spring inject map issue春季注入地图问题
【发布时间】：2016-03-03 15:55:43
【问题描述】：

我看到以下错误，它试图将地图注入 bean。我不确定 Spring 是如何推断出我尝试注入的地图是 org.apache.commons.collections.map.LinkedMap 类型的。我该如何解决这个问题？

[org.apache.commons.collections.map.LinkedMap] 到所需类型 [java.util.LinkedHashMap] 用于属性“asyncConnectorDaoMap”；嵌套的异常是 java.lang.IllegalArgumentException：无法转换值 [org.apache.commons.collections.map.LinkedMap] 类型为必需输入 [java.util.LinkedHashMap]

弹簧配置

<bean id="fulfillment.management.AsyncConnectorFactory" class="com.service.async.AsyncConnectorFactory">      <property name="asyncConnectorDaoMap">         <map key-type="java.lang.String" value-type="com.service.async.AsyncConnectorDao">
                     <entry key="ACCOUNT_MANAGEMENT_CONTROLLER" value-ref="core.commons.AsyncConnectorDao"></entry>
                     <entry key="CUSTOMER_SERVICE" value-ref="core.commons.AsyncConnectorDao"></entry>
                     <entry key="ACCOUNT_SERVICE" value-ref="core.commons.AsyncConnectorDao"></entry>
                     <entry key="LOCATION_SERVICE" value-ref="core.commons.AsyncConnectorDao"></entry>        </map>       </property>  </bean>

代码如下

import java.util.LinkedHashMap;


public class AsyncConnectorFactory {

    private LinkedHashMap<String, AsyncConnectorDao> asyncConnectorDaoMap;

    public LinkedHashMap<String, AsyncConnectorDao> getAsyncConnectorDaoMap() {
        return asyncConnectorDaoMap;
    }

    public void setAsyncConnectorDaoMap(
            LinkedHashMap<String, AsyncConnectorDao> asyncConnectorDaoMap) {
        this.asyncConnectorDaoMap = asyncConnectorDaoMap;
    }

    public AsyncConnectorDao getAsyncConcurrentConnectorDao(String serviceIdentifier) {
        return asyncConnectorDaoMap.get(serviceIdentifier);
    }
}

修改后的工作配置

    <bean id="fulfillment.management.AsyncConnectorFactory" class="com.service.async.AsyncConnectorFactory">
      <property name="asyncConnectorDaoMap" ref="asyncConnectorDaoMap1"/>
</bean> 

<util:map id="asyncConnectorDaoMap1" map-class="java.util.LinkedHashMap">
             <entry key="ACCOUNT_MANAGEMENT_CONTROLLER" value-ref="core.commons.AsyncConnectorDao"></entry>
             <entry key="CUSTOMER_SERVICE" value-ref="core.commons.AsyncConnectorDao"></entry>
             <entry key="ACCOUNT_SERVICE" value-ref="core.commons.AsyncConnectorDao"></entry>
             <entry key="LOCATION_SERVICE" value-ref="core.commons.AsyncConnectorDao"></entry>

【问题讨论】：

标签： java spring

【解决方案1】：

您是否尝试过先创建地图，然后将其作为参考传递。

<util:map id="p:asyncConnectorDaoMap" map-class="java.util.LinkedHashMap">
    <entry key="ACCOUNT_MANAGEMENT_CONTROLLER" value-ref="asyncConnectorDao"/>
    <entry key="CUSTOMER_SERVICE" value-ref="asynConnectorService"/
</util:map>

<bean id="asyncConnectorDao" class="core.commons.AsyncConnectorDao" />
<bean id="asynConnectorService" class="core.commons.AsyncConnectorService" />


<bean id="fulfillment.management.AsyncConnectorFactory" class="com.service.async.AsyncConnectorFactory">      
    <property name="asyncConnectorDaoMap" ref="asyncConnectorDaoMap"/>       
</bean>

确保您的 DAO 和服务 bean 已创建。考虑使用MapFactoryBean

使用schema，供util使用

http://www.springframework.org/schema/util 
http://www.springframework.org/schema/util/spring-util-3.0.xsd

【讨论】：

谢谢Koitoer，我定义的方式有什么问题吗？
我认为问题出在 value-ref 中，似乎你指向的是一个类而不是一个 bean
感谢 Kotoer ，现在可以使用了。我已经粘贴了工作配置。