如何在Spring中获取泛型类型的类 [英] How to get class of generic type in Spring

问题描述

我的spring项目中有一个泛型类DAO，我必须获取泛型T的类.我知道纯Java解决方案:

I have a generics class DAO in my spring project,I have to get class of generic T.I know the pure java solution:

class Foo<T> {
    final Class<T> typeParameterClass;

    public Foo(Class<T> typeParameterClass) {
        this.typeParameterClass = typeParameterClass;
    }

    public void bar() {
        // you can access the typeParameterClass here and do whatever you like
    }
}

但是，在春季项目中，我必须从"ApplicationContext"中获取Foo，我无法通过以下方式获取Foo:

But,in spring project,I have to get the Foo from the "ApplicationContext",I can't get Foo by:

Foo<ClassName> foo = new Foo<ClassName>(ClassName.class);

如何在Spring中获取通用类型的类.

How to get class of generic type in Spring.

推荐答案

Spring可以使用带参数的构造函数

Spring is able to use constructors with parameters

在Java配置中，这非常简单:

In java configuration, it is very simple :

@Configuration
public class MyConf {
    ...
    @Bean
    private foo() {
        return new Foo<ClassName>(ClassName.class);
    }
    ...
}

使用XML配置也可以

<bean id="foo" class="...Foo">
    <constructor-arg type="java.lang.Class" value="...ClassName"/>
</bean>

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