在类路径中加载jar内的弹簧应用程序上下文文件 [英] Loading spring application context files that are inside a jar in classpath

问题描述

我正在尝试在我的java独立代码中使用ClassPathXmlApplicationContext来加载我的类路径中的jar文件中的applicationContext.xml。

  ApplicationContext context = new ClassPathXmlApplicationContext（classpath *：** / applicationContext * .xml）; 
  

applicationContext.xml条目如下，

 < bean id =myAdderclass =com.foo.bar.MyAdder> 
< property name =floatAdderref =floatAdder/> 
< / bean> 
  

而且，当我尝试加载一个bean时，我得到了NoSuchBeanException。不能以这种方式加载bean？

将jar文件作为一个maven依赖项添加到我的类路径中。当我在Eclipse中看到这个项目的Java构建路径时，我看到这个jar链接为M2_REPO /.../..

我假设我可以加载bean在jar文件中，jar是以类路径这样的方式。我是否缺少某些东西？

谢谢Abi

解决方案

工作，我刚刚创建了2个项目并检查。

项目A（使用STS创建的标准Maven项目）具有 applicationContext.xml 在src / main / resources。

pom.xml：

 < project xmlns =http ：//maven.apache.org/POM/4.0.0xmlns：xsi =http://www.w3.org/2001/XMLSchema-instance
 xsi：schemaLocation =http：// maven .apache.org / POM / 4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd\"> 
< modelVersion> 4.0.0< / modelVersion> 
< groupId> org.D< / groupId> 
< artifactId> A< / artifactId> 
< version> 0.0.1-SNAPSHOT< / version> 
 
< properties> 
< spring.version> 3.0.5.RELEASE< /spring.version> 
< / properties> 
 
<依赖关系> 
<依赖关系> 
< groupId> org.springframework< / groupId> 
< artifactId> spring-context< / artifactId> 
< version> $ {spring.version}< / version> 
< / dependency> 
< / dependencies> 
< / project> 
  

applicationContext.xml：

 <？xml version =1.0encoding =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 =myAdderclass =com.foo.bar.MyAdder> 
< property name =foovalue =bar/> 
< / bean> 
 
< / beans> 
  

项目B：

pom.xml ：与A相同，除了A作为依赖添加：

 < dependency> 
< groupId> org.D< / groupId> 
< artifactId> A< / artifactId> 
< version> 0.0.1-SNAPSHOT< / version> 
< / dependency> 
  

项目B中的Start.java：

  public static void main（String [] args）{
 ApplicationContext context = new ClassPathXmlApplicationContext（
classpath *：** / applicationContext * .xml）; 
 
 MyAdder myAdder =（MyAdder）context.getBean（myAdder）; 
 System.out.println（myAdder.getFoo（））; 
} 
  

mvn install首先，在项目B中运行开始。

I am trying to use ClassPathXmlApplicationContext in my java standalone code to load applicationContext.xml that is inside a jar file which is in my class path.

ApplicationContext context = new ClassPathXmlApplicationContext("classpath*:**/applicationContext*.xml");

applicationContext.xml entry as follows,

 <bean id="myAdder" class="com.foo.bar.MyAdder">
        <property name="floatAdder" ref="floatAdder"/>        
    </bean>

And, when I try to load a bean that way I am getting NoSuchBeanException. Can't a bean by loaded in this way?

The jar file is added to my classpath as a maven dependency. When I see the Java Build Path in Eclipse for this project, I see this jar linked as M2_REPO/.../..

I was assuming I can load the bean inside the jar file as the jar is in classpath this way. Am I missing something?

Thanks,Abi

解决方案

This should work, I just created the 2 projects and checked.

Project A (standard Maven project created with STS) has applicationContext.xml in src/main/resources.

pom.xml:

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.D</groupId>
<artifactId>A</artifactId>
<version>0.0.1-SNAPSHOT</version>

<properties>        
    <spring.version>3.0.5.RELEASE</spring.version>
</properties>

<dependencies>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>${spring.version}</version>
    </dependency>
</dependencies>
</project>

applicationContext.xml:

<?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="myAdder" class="com.foo.bar.MyAdder">
    <property name="foo" value="bar" />
</bean>

</beans>

Project B:

pom.xml: same as A, except A is added as dependency:

<dependency>
   <groupId>org.D</groupId>
   <artifactId>A</artifactId>
   <version>0.0.1-SNAPSHOT</version>
</dependency>

Start.java in project B:

public static void main(String[] args) {
    ApplicationContext context = new ClassPathXmlApplicationContext(
            "classpath*:**/applicationContext*.xml");

    MyAdder myAdder = (MyAdder) context.getBean("myAdder");
    System.out.println(myAdder.getFoo());
}

mvn install A first, then run Start in project B.

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