Spring并在运行时将参数传递给factory-method [英] Spring and passing parameters to factory-method in runtime

问题描述

方法context.getBean（name，user）的文档说

The documentation of method context.getBean(name, user) says

允许指定显式构造函数参数/工厂方法
参数

Allows for specifying explicit constructor arguments / factory method arguments

但无论我做什么（尝试过所有事情），最合乎逻辑的设置我在加载bean时得到这个在初始化期间启动：

but no matter what I do (tried everything), with the most logical setting I get this when the beans are being loaded up during initialization:

org.springframework.beans.factory.UnsatisfiedDependencyException:
Error creating bean with name 'fileValidator' defined in
PortletContext resource
[/WEB-INF/classes/context/customer-form-portlet.xml]: Unsatisfied
dependency expressed through constructor argument with index 0 of type
[com.liferay.portal.model.User]: Ambiguous factory method argument
types - did you specify the correct bean references as factory method
arguments?
    org.springframework.beans.factory.UnsatisfiedDependencyException:
Error creating bean with name 'fileValidator' defined in
PortletContext resource
[/WEB-INF/classes/context/customer-form-portlet.xml]: Unsatisfied
dependency expressed through constructor argument with index 0 of type
[com.liferay.portal.model.User]: Ambiguous factory method argument
types - did you specify the correct bean references as factory method
arguments?

---

---

<bean id="fileValidator" 
      class="cz.instance.transl.validation.file.FileValidator" 
      factory-method="createInstance" />

---

---

private FileValidator(User user) {
    this.user = user;
}

public static FileValidator createInstance(User user) {
    return new FileValidator(user);
}

评论说你可以这样做，但是如果你在xml中指定构造函数参数无论是否定义该bean，它都会失败。

The commentary says you can do it, but if you specify constructor arguments in xml definiton of that bean or not, it fails.

推荐答案

javadoc 说：

args - 使用静态工厂方法的显式参数创建原型时使用的参数。

args - arguments to use if creating a prototype using explicit arguments to a static factory method.

因此bean定义必须是一个原型范围的bean，即

So the bean definition must be a prototype-scoped bean, i.e.

<bean id="fileValidator" 
      scope="prototype" 
      class="cz.instance.transl.validation.file.FileValidator" 
      factory-method="createInstance" />

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