Question

我有一个名为SpringPoc.jar的jar，我使用eclipse作为runnable jar导出

在罐子里面我有2个班级一个是

public class NormalServlet {

    public void executeScheduler() {        
         ApplicationContext context = 
                 new ClassPathXmlApplicationContext("com/serv/Beans.xml");

          CallMeth obj = (CallMeth) context.getBean("callMeth");
          obj.test();       
    }}

第二课是主要应用

public class MainApp {

public static void main(String[] args) {

    ApplicationContext context = new ClassPathXmlApplicationContext("com/serv/Beans.xml");

    CallMeth obj = (CallMeth) context.getBean("callMeth");
    obj.test();
}}

我在Beans.xml中定义了一个bean

 <bean id="callMeth" class="com.poc.CallMeth"/>

然后我在eclipse中创建了一个带有测试类的简单java项目它调用jar并尝试执行上面的类NormalServlet

public class Test {

    public static void main(String[] args) {

        try {

            URL[] classLoaderUrls =  new URL[]{new URL("file:\\D:\\MyWorkspace\\Scheduler\\src\\com\\callit\\SpringPoc.jar")};
             URLClassLoader urlClassLoader = new URLClassLoader(classLoaderUrls);

                Class classToLoad = Class.forName ("com.serv.NormalServlet", true, urlClassLoader);
                Method method = classToLoad.getDeclaredMethod ("executeScheduler");
                Object instance = classToLoad.newInstance ();
                Object result = method.invoke (instance);   

        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

当我运行测试类

时

我收到以下错误

Sep 09, 2016 11:48:30 AM org.springframework.context.support.AbstractApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@1c50507: startup date [Fri Sep 09 11:48:30 IST 2016]; root of context hierarchy
Sep 09, 2016 11:48:30 AM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from class path resource [com/serv/Beans.xml]
java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at com.callit.Scheduler.callMe(Scheduler.java:40)
    at com.callit.Scheduler.main(Scheduler.java:15)
Caused by: org.springframework.beans.factory.BeanDefinitionStoreException: IOException parsing XML document from class path resource [com/serv/Beans.xml]; nested exception is java.io.FileNotFoundException: class path resource [com/serv/Beans.xml] cannot be opened because it does not exist
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:343)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:303)
    at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:180)
    at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:216)
    at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:187)
    at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:251)
    at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:127)
    at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:93)
    at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:129)
    at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:540)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:454)
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
    at com.serv.NormalServlet.executeScheduler(NormalServlet.java:17)
    ... 6 more
Caused by: java.io.FileNotFoundException: class path resource [com/serv/Beans.xml] cannot be opened because it does not exist
    at org.springframework.core.io.ClassPathResource.getInputStream(ClassPathResource.java:172)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:329)
    ... 19 more

如果我从cmd运行相同的jar 作为java -jar SprrinPoc.jar 调用MainApp类并且Beans.xml加载正常

问题是当我从测试类

外部调用Normalservlet时它为什么不加载

非常感谢

Answer 1

只要依赖jar文件包含xxx.xml，它也应该在您的宿主项目类路径中可用。这将在classpath

中的任何位置搜索applicationcontext.xml

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

使用java类加载jar

1 个答案: