Question

我只使用文档学习Spring。当idref进入画面时我感到困惑。我的理解是为了在bean中定义一个属性，我们需要使用＆＃34;属性＆＃34;标记为＆＃34;名称＆＃34;和＆＃34;价值＆＃34;属性。＆＃34;名称＆＃34;应该是我们为POJO中的财产提供的名称和＆＃34;值＆＃34;可以是任何原始数据类型。如果我们需要将它映射到一个单独的bean，那么我们应该使用＆＃34; ref＆＃34;属性改为。这＆＃34; ref＆＃34;属性必须包含＆＃34; id＆＃34;我们所指的豆子。

现在根据文档我们有一个片段，显示＆＃34;值＆＃34;属性引用另一个bean。文档建议使用＆＃34; idref＆＃34;代替。当我实时尝试时，我得到以下异常。

Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'theClientBean' defined in class path resource [ConstructorInjectionDemo.xml]: Initialization of bean failed; nested exception is org.springframework.beans.ConversionNotSupportedException: Failed to convert property value of type 'java.lang.String' to required type 'com.javagrasp.dependencies.TheTargetBean' for property 'targetName'; nested exception is java.lang.IllegalStateException: Cannot convert value of type [java.lang.String] to required type [com.javagrasp.dependencies.TheTargetBean] for property 'targetName': no matching editors or conversion strategy found

Bean定义：

<bean id="theTargetBean" class="com.javagrasp.dependencies.TheTargetBean"/>

<bean id="theClientBean" class="com.javagrasp.dependencies.TheClientBean">
<property name="targetName">
    <idref bean="theTargetBean" />
</property>
</bean>

课程详情：

ClientBean类：

public class TheClientBean  {

private TheTargetBean targetName;

public void setTargetName(TheTargetBean targetName) {
    this.targetName = targetName;
}
}

TargetBean类：

package com.javagrasp.dependencies;
public class TheTargetBean {

}

此外：

下面的内容是什么意思，我是否需要在某些惯例中命名属性？

17:44:22.270 [main] DEBUG org.springframework.beans.BeanUtils - No property editor [com.javagrasp.dependencies.TheTargetBeanEditor] found for type com.javagrasp.dependencies.TheTargetBean according to 'Editor' suffix convention

Answer 1

由于IdRef传递了你的bean应该喜欢的bean的名称

public class TheClientBean  {

    private String targetName;

   //Name of the Bean is passed here.
    public void setTargetName(String targetName) {
      this.targetName = targetName;
   }
}

在Spring中的idref和ref的区别

1 个答案: