spring @Autowired注入沒問題 而 @Resource注入 為null

最近自己搭一個ssm項(xiàng)目。以前都用@Autowired 這次想試試用@Resource。但是用resource時總是注入失敗，啟動時不報錯，運(yùn)行時報空指針異常。

1. 報錯
   java.lang.NullPointerException
   at TestMyBatis.test3(TestMyBatis.java:43)
   at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
   at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.base/java.lang.reflect.Method.invoke(Method.java:564)
   at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
   at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
   at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
   at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
   at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
   at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
   at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
   at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
   at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:252)
   at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:94)
   at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
   at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
   at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
   at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
   at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
   at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
   at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
   at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
   at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:191)
   at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
   at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
   at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
   at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
   at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)

配置文件

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

   xmlns:tx="http://www.springframework.org/schema/tx" xmlns:p="http://www.springframework.org/schema/p" xmlns:util="http://www.springframework.org/schema/util" xmlns:jdbc="http://www.springframework.org/schema/jdbc"
   xmlns:cache="http://www.springframework.org/schema/cache"
   xsi:schemaLocation="
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/jdbc
http://www.springframework.org/schema/jdbc/spring-jdbc-3.1.xsd
http://www.springframework.org/schema/cache
http://www.springframework.org/schema/cache/spring-cache-3.1.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/util
http://www.springframework.org/schema/util/spring-util.xsd">

<!-- 掃描包下所有使用注解的類型 -->
<context:component-scan base-package="com.mineblog"></context:component-scan>

<!-- 配置數(shù)據(jù)庫相關(guān)參數(shù)properties的屬性：${url} -->
<context:property-placeholder location="classpath:jdbc.properties"/>

<!-- 數(shù)據(jù)庫連接池 -->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
    <property name="driverClassName" value="${jdbc.driverClassName}"/>
    <property name="url" value="${jdbc.url}"/>
    <property name="username" value="${jdbc.username}"/>
    <property name="password" value="${jdbc.password}"/>
    <property name="initialSize" value="${jdbc.initialSize}"/>
    <property name="maxActive" value="${jdbc.maxActive}"/>
    <property name="maxIdle" value="${jdbc.maxIdle}"/>
    <property name="minIdle" value="${jdbc.minIdle}"/>
    <property name="maxWait" value="${jdbc.maxWait}"/>
    <property name="removeAbandonedTimeout" value="${jdbc.removeAbandonedTimeout}"/>
</bean>

<!-- 配置SqlSessionFactory對象 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
    <!-- 注入數(shù)據(jù)庫連接池 -->
    <property name="dataSource" ref="dataSource" />
    <!-- 掃描model包 使用別名 -->
    <property name="typeAliasesPackage" value="com.mineblog.pojo"/>
    <!-- 自動掃描mapping.xml文件 -->
    <property name="mapperLocations" value="classpath:mapper/**/*.xml"></property>
</bean>



<!-- 配置掃描Dao接口包，動態(tài)實(shí)現(xiàn)Dao接口，注入到spring容器中 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
    <!-- 注入sqlSessionFactory -->
    <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
    <!-- 給出需要掃描Dao接口包 -->
    <property name="basePackage" value="com.mineblog.dao"/>
</bean>

<!-- 配置事務(wù)管理器 -->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    <!-- 注入數(shù)據(jù)庫連接池 -->
    <property name="dataSource" ref="dataSource"/>
</bean>

<!-- 配置基于注解的聲明式事務(wù)@Transactional -->
<tx:annotation-driven transaction-manager="transactionManager"/>

<aop:aspectj-autoproxy />

</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"
   xmlns:context="http://www.springframework.org/schema/context"
   xmlns:mvc="http://www.springframework.org/schema/mvc"
   xsi:schemaLocation="http://www.springframework.org/schema/beans
   http://www.springframework.org/schema/beans/spring-beans.xsd
   http://www.springframework.org/schema/context
   http://www.springframework.org/schema/context/spring-context.xsd
   http://www.springframework.org/schema/mvc
   http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">


<context:annotation-config/>

<!-- 掃描web相關(guān)的bean -->
<context:component-scan base-package="com.mineblog"/>

<!-- 開啟SpringMVC注解模式 -->
<mvc:annotation-driven/>

<!-- 靜態(tài)資源默認(rèn)servlet配置 -->
<mvc:default-servlet-handler/>

<!-- 配置jsp 顯示ViewResolver -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
    <property name="prefix" value="/WEB-INF/jsp/"/>
    <property name="suffix" value=".jsp"/>
</bean>

</beans>

<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web

Application 2.3//EN"  "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">   <display-name>Archetype Created Web Application</display-name>

  <!-- 編碼過濾器 -->   <filter>
    <filter-name>encodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>UTF-8</param-value>
    </init-param>   </filter>   <filter-mapping>
    <filter-name>encodingFilter</filter-name>
    <url-pattern>/*</url-pattern>   </filter-mapping>

  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:spring-mybatis.xml</param-value>   </context-param>


  <!-- 配置DispatcherServlet -->   <servlet>
    <servlet-name>SpringMVC</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <!-- 配置springMVC需要加載的配置文件-->
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:spring-*.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
    <async-supported>true</async-supported>   </servlet>   <servlet-mapping>
    <servlet-name>SpringMVC</servlet-name>
    <!-- 匹配所有請求-->
    <url-pattern>/</url-pattern>   </servlet-mapping>


  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>   </welcome-file-list> </web-app>