为什么我这 bean 的路径老是说找不到？-慕课网

为什么我这 bean 的路径老是说找不到？

来源：3-1 Spring Bean装配之Bean的配置项及作用域

moummm

2017-09-30 01:38

public class UnitTestBase {
    private ClassPathXmlApplicationContext context;

    private String springXmlpath;

    public UnitTestBase() {}

    public UnitTestBase(String springXmlpath) {
        this.springXmlpath = springXmlpath;
    }

    @Before
    public void before() {
        if (StringUtils.isEmpty(springXmlpath)) {
            springXmlpath = "classpath*:spring-*.xml";
        }
        try {
            context = new ClassPathXmlApplicationContext(springXmlpath.split("[,\\s]+"));
            context.start();
        } catch (BeansException e) {
            e.printStackTrace();
        }
    }

    @After
    public void after() {
        context.destroy();
    }

    @SuppressWarnings("unchecked")
    protected <T extends Object> T getBean(String beanId) {
        try {
            return (T)context.getBean(beanId);
        } catch (BeansException e) {
            e.printStackTrace();
            return null;
        }
    }

    protected <T extends Object> T getBean(Class<T> clazz) {
        try {
            return context.getBean(clazz);
        } catch (BeansException e) {
            e.printStackTrace();
            return null;
        }
    }
}

public class BeanScope {
    public void say(){
        System.out.println("当前对象为："+this.hashCode());
    }
}

@RunWith(BlockJUnit4ClassRunner.class)
public class TestBeanScope extends UnitTestBase{
    public TestBeanScope(){
        super("classpath*:spring-beanscope.xml");
    }

    @Test
    public void testSay(){
        BeanScope beanScope = super.getBean("beanScope");
        beanScope.say();
    }
}

<?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="beanScope" class="main.java.com.bean.BeanScope" scope="singleton"></bean>
</beans>

九月 30, 2017 1:31:08 上午 org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh
信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@558fbefd: startup date [Sat Sep 30 01:31:08 CST 2017]; root of context hierarchy
org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'beanScope' available
   at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanDefinition(DefaultListableBeanFactory.java:687)
   at org.springframework.beans.factory.support.AbstractBeanFactory.getMergedLocalBeanDefinition(AbstractBeanFactory.java:1207)
   at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:284)
   at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
   at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1078)
   at com.testJunit.UnitTestBase.getBean(UnitTestBase.java:44)
   at test.java.com.bean.TestBeanScope.testSay(TestBeanScope.java:20)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:606)
   at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
   at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
   at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
   at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
   at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
   at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
   at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)
   at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)
   at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)
   at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
   at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
   at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
   at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
   at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
   at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
   at org.junit.runner.JUnitCore.run(JUnitCore.java:157)
   at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
   at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:51)
   at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
   at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
九月 30, 2017 1:31:08 上午 org.springframework.context.support.ClassPathXmlApplicationContext doClose
信息: Closing org.springframework.context.support.ClassPathXmlApplicationContext@558fbefd: startup date [Sat Sep 30 01:31:08 CST 2017]; root of context hierarchy

java.lang.NullPointerException
   at test.java.com.bean.TestBeanScope.testSay(TestBeanScope.java:21)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:606)
   at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
   at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
   at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
   at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
   at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
   at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
   at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)
   at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)
   at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)
   at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
   at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
   at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
   at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
   at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
   at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
   at org.junit.runner.JUnitCore.run(JUnitCore.java:157)
   at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
   at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:51)
   at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
   at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)

Process finished with exit code -1

写回答关注

3回答

shawffer

2018-04-27 12:51:37
这么说吧 class=“***” ***这个东西是你的包名+所用到的类名
我给你看下我的代码
package com.imooc.bean;

public class BeanScope {
public void say() {
System.out.println("BeanScope say:"+this.hashCode());
}
}

这是我自己在看的时候,工具类的源码。在package关键字后面的就是这个java文件的包名，类名就是你这个文件的类名然后***里面写的是包名.类名

<bean id="beanScope" class="com.imooc.bean.BeanScope" scope="prototype"></bean>
你比较下写法。在写***的时候不要按照文件夹这样写，就直接看java文件自己首部的包的信息
0 0
Vermouth_HN

2017-09-30 11:14:21

那算是maven的文件规则吧 , 不属于路径里边

0 0
Vermouth_HN

2017-09-30 11:12:56

Bean 路径里的 main/Java/去掉

2 0

qq_子然_... 回复moummm

ssss

2017-11-03 14:46:24

共 2 条回复 >

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