Java 引用另一个.xml文件中定义的bean

我有两个spring应用程序上下文XML：

A.xml

B.xml

...

文件A.xml不在我的控制之下，因此我无法使用

导入B.xml，但B.xml导入A.xml，因此它完全是另一种方式

由于允许的

SpEL

语法

{getObject（'bBean'）}

，aBean始终被实例化为空

有没有办法克服这个问题

谢谢

这是有效的：

主类：

package com.example;

import com.example.route.A;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.ImportResource;


@SpringBootApplication
@ImportResource(locations = {"classpath*:/ctxt/B.xml"})
public class DemoApplication {


    public static void main(String[] args) {
        ApplicationContext ctxt = SpringApplication.run(DemoApplication.class, args);

        A a = ctxt.getBean(A.class);
        System.out.println(a.toString());   // A{b=com.example.route.B@5488b5c5}   <-- A init correctly with non-null B


    }
}

package com.example.route;

public class A {

    private B b;

    public A(B b) {
        this.b = b;
    }

    public B getB() {
        return b;
    }

    @Override
    public String toString() {
        final StringBuilder sb = new StringBuilder("A{");
        sb.append("b=").append(b);
        sb.append('}');
        return sb.toString();
    }
}

package com.example.route;

public class B {
}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="aBean" class="com.example.route.A">
        <constructor-arg name="bBean" value="#getObject('bBean')"/>
    </bean>
</beans>

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="bBean" class="com.example.route.B"></bean>

    <import resource="classpath*:ctxt/A.xml"></import>
</beans>

B类：

package com.example;

import com.example.route.A;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.ImportResource;


@SpringBootApplication
@ImportResource(locations = {"classpath*:/ctxt/B.xml"})
public class DemoApplication {


    public static void main(String[] args) {
        ApplicationContext ctxt = SpringApplication.run(DemoApplication.class, args);

        A a = ctxt.getBean(A.class);
        System.out.println(a.toString());   // A{b=com.example.route.B@5488b5c5}   <-- A init correctly with non-null B


    }
}

package com.example.route;

public class A {

    private B b;

    public A(B b) {
        this.b = b;
    }

    public B getB() {
        return b;
    }

    @Override
    public String toString() {
        final StringBuilder sb = new StringBuilder("A{");
        sb.append("b=").append(b);
        sb.append('}');
        return sb.toString();
    }
}

package com.example.route;

public class B {
}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="aBean" class="com.example.route.A">
        <constructor-arg name="bBean" value="#getObject('bBean')"/>
    </bean>
</beans>

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="bBean" class="com.example.route.B"></bean>

    <import resource="classpath*:ctxt/A.xml"></import>
</beans>

/resources/ctxt/A.xml：

package com.example;

import com.example.route.A;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.ImportResource;


@SpringBootApplication
@ImportResource(locations = {"classpath*:/ctxt/B.xml"})
public class DemoApplication {


    public static void main(String[] args) {
        ApplicationContext ctxt = SpringApplication.run(DemoApplication.class, args);

        A a = ctxt.getBean(A.class);
        System.out.println(a.toString());   // A{b=com.example.route.B@5488b5c5}   <-- A init correctly with non-null B


    }
}

package com.example.route;

public class A {

    private B b;

    public A(B b) {
        this.b = b;
    }

    public B getB() {
        return b;
    }

    @Override
    public String toString() {
        final StringBuilder sb = new StringBuilder("A{");
        sb.append("b=").append(b);
        sb.append('}');
        return sb.toString();
    }
}

package com.example.route;

public class B {
}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="aBean" class="com.example.route.A">
        <constructor-arg name="bBean" value="#getObject('bBean')"/>
    </bean>
</beans>

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="bBean" class="com.example.route.B"></bean>

    <import resource="classpath*:ctxt/A.xml"></import>
</beans>

/resources/ctxt/B.xml：

package com.example;

import com.example.route.A;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.ImportResource;


@SpringBootApplication
@ImportResource(locations = {"classpath*:/ctxt/B.xml"})
public class DemoApplication {


    public static void main(String[] args) {
        ApplicationContext ctxt = SpringApplication.run(DemoApplication.class, args);

        A a = ctxt.getBean(A.class);
        System.out.println(a.toString());   // A{b=com.example.route.B@5488b5c5}   <-- A init correctly with non-null B


    }
}

package com.example.route;

public class A {

    private B b;

    public A(B b) {
        this.b = b;
    }

    public B getB() {
        return b;
    }

    @Override
    public String toString() {
        final StringBuilder sb = new StringBuilder("A{");
        sb.append("b=").append(b);
        sb.append('}');
        return sb.toString();
    }
}

package com.example.route;

public class B {
}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="aBean" class="com.example.route.A">
        <constructor-arg name="bBean" value="#getObject('bBean')"/>
    </bean>
</beans>

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="bBean" class="com.example.route.B"></bean>

    <import resource="classpath*:ctxt/A.xml"></import>
</beans>

这项工作：

主类：

package com.example;

import com.example.route.A;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.ImportResource;


@SpringBootApplication
@ImportResource(locations = {"classpath*:/ctxt/B.xml"})
public class DemoApplication {


    public static void main(String[] args) {
        ApplicationContext ctxt = SpringApplication.run(DemoApplication.class, args);

        A a = ctxt.getBean(A.class);
        System.out.println(a.toString());   // A{b=com.example.route.B@5488b5c5}   <-- A init correctly with non-null B


    }
}

package com.example.route;

public class A {

    private B b;

    public A(B b) {
        this.b = b;
    }

    public B getB() {
        return b;
    }

    @Override
    public String toString() {
        final StringBuilder sb = new StringBuilder("A{");
        sb.append("b=").append(b);
        sb.append('}');
        return sb.toString();
    }
}

package com.example.route;

public class B {
}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="aBean" class="com.example.route.A">
        <constructor-arg name="bBean" value="#getObject('bBean')"/>
    </bean>
</beans>

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="bBean" class="com.example.route.B"></bean>

    <import resource="classpath*:ctxt/A.xml"></import>
</beans>

B类：

package com.example;

import com.example.route.A;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.ImportResource;


@SpringBootApplication
@ImportResource(locations = {"classpath*:/ctxt/B.xml"})
public class DemoApplication {


    public static void main(String[] args) {
        ApplicationContext ctxt = SpringApplication.run(DemoApplication.class, args);

        A a = ctxt.getBean(A.class);
        System.out.println(a.toString());   // A{b=com.example.route.B@5488b5c5}   <-- A init correctly with non-null B


    }
}

package com.example.route;

public class A {

    private B b;

    public A(B b) {
        this.b = b;
    }

    public B getB() {
        return b;
    }

    @Override
    public String toString() {
        final StringBuilder sb = new StringBuilder("A{");
        sb.append("b=").append(b);
        sb.append('}');
        return sb.toString();
    }
}

package com.example.route;

public class B {
}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="aBean" class="com.example.route.A">
        <constructor-arg name="bBean" value="#getObject('bBean')"/>
    </bean>
</beans>

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="bBean" class="com.example.route.B"></bean>

    <import resource="classpath*:ctxt/A.xml"></import>
</beans>

/resources/ctxt/A.xml：

package com.example;

import com.example.route.A;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.ImportResource;


@SpringBootApplication
@ImportResource(locations = {"classpath*:/ctxt/B.xml"})
public class DemoApplication {


    public static void main(String[] args) {
        ApplicationContext ctxt = SpringApplication.run(DemoApplication.class, args);

        A a = ctxt.getBean(A.class);
        System.out.println(a.toString());   // A{b=com.example.route.B@5488b5c5}   <-- A init correctly with non-null B


    }
}

package com.example.route;

public class A {

    private B b;

    public A(B b) {
        this.b = b;
    }

    public B getB() {
        return b;
    }

    @Override
    public String toString() {
        final StringBuilder sb = new StringBuilder("A{");
        sb.append("b=").append(b);
        sb.append('}');
        return sb.toString();
    }
}

package com.example.route;

public class B {
}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="aBean" class="com.example.route.A">
        <constructor-arg name="bBean" value="#getObject('bBean')"/>
    </bean>
</beans>

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="bBean" class="com.example.route.B"></bean>

    <import resource="classpath*:ctxt/A.xml"></import>
</beans>

/resources/ctxt/B.xml：

package com.example;

import com.example.route.A;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.ImportResource;


@SpringBootApplication
@ImportResource(locations = {"classpath*:/ctxt/B.xml"})
public class DemoApplication {


    public static void main(String[] args) {
        ApplicationContext ctxt = SpringApplication.run(DemoApplication.class, args);

        A a = ctxt.getBean(A.class);
        System.out.println(a.toString());   // A{b=com.example.route.B@5488b5c5}   <-- A init correctly with non-null B


    }
}

package com.example.route;

public class A {

    private B b;

    public A(B b) {
        this.b = b;
    }

    public B getB() {
        return b;
    }

    @Override
    public String toString() {
        final StringBuilder sb = new StringBuilder("A{");
        sb.append("b=").append(b);
        sb.append('}');
        return sb.toString();
    }
}

package com.example.route;

public class B {
}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="aBean" class="com.example.route.A">
        <constructor-arg name="bBean" value="#getObject('bBean')"/>
    </bean>
</beans>

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="bBean" class="com.example.route.B"></bean>

    <import resource="classpath*:ctxt/A.xml"></import>
</beans>

此项目工作正常。然而，我最终得到了另一个文件A.xml，我在其中定义了bBean，因此在类路径中找到的两个名为A.xml的文件合并到一个文件中。在我的项目中不起作用，可能是因为加载整个依赖关系树的xml的方式很奇怪，其中包括约100个模块。如果它在您的大项目中不起作用，请检查您的类路径。如果您正在创建一个大jar，打开它，看看xml文件在哪里，很可能您在“classpath*：”字符串文字定义中没有正确引用它。classpath应该可以，因为a.xml位于a.jar的根级别，包含在B中作为第二级依赖项，如：B->（其他模块）->A.使用intellij idea spring插件并单击

可正确解析该文件。此项目工作正常。然而，我最终得到了另一个文件A.xml，我在其中定义了bBean，因此在类路径中找到的两个名为A.xml的文件合并到一个文件中。在我的项目中不起作用，可能是因为加载整个依赖关系树的xml的方式很奇怪，其中包括约100个模块。如果它在您的大项目中不起作用，请检查您的类路径。如果您正在创建一个大jar，打开它，看看xml文件在哪里，很可能您在“classpath*：”字符串文字定义中没有正确引用它。classpath应该可以，因为a.xml位于a.jar的根级别，包含在B中作为第二级依赖项，如：B->（其他模块）->A.使用intellij idea spring插件并单击

可正确解析该文件。