ContextLoader.getCurrentWebApplicationContext();返回null怎么回事

Question

applicationContext.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:util="http://www.springframework.org/schema/util"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
    http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.0.xsd">
    <!-- 数据源 -->
    <bean id="NNMiDS" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="oracle.jdbc.driver.OracleDriver"></property>
        <property name="url" value="jdbc:oracle:thin:@10.27.125.61:1521:reporter"></property>
        <property name="username" value="openview"></property>
        <property name="password" value="openview"></property>
    </bean>
    
    <!-- 数据源 -->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="oracle.jdbc.driver.OracleDriver"></property>
        <property name="url" value="jdbc:oracle:thin:@//147.16.17.98:1521/hpsm"></property>
        <property name="username" value="hndsPilot"></property>
        <property name="password" value="hndsPilot"></property>
    </bean>

    <!-- 网络监控(NNMi) 性能数据 -->
    <bean id="sybaseDS" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.sybase.jdbc4.jdbc.SybDriver"></property>
        <property name="url" value="jdbc:sybase:Tds:10.27.124.221:9303/hpnnmi_perfspi"></property>
        <property name="username" value="DBA"></property>
        <property name="password" value="HP_IQ"></property>
    </bean>
</beans>

  // 获取spring配置文件地址
        ApplicationContext ctx = ContextLoader.getCurrentWebApplicationContext();
  
        // 获取数据源
        try {
            ds = (DataSource) ctx.getBean("dataSource");
            
            sybaseDs = (DataSource) ctx.getBean("sybaseDS");
            my= (DataSource) ctx.getBean("NNMiDS");
            
        } catch (Exception e) {
            
            e.printStackTrace();
        }

 异常

  这行报null怎么回事,我灰常不理解.请大家帮忙指点给出方案来,谢谢.

Answer 1

你什么使用调用的
ApplicationContext ctx = ContextLoader.getCurrentWebApplicationContext();

此处需要注意 一定要ContextLoaderListener 才行 即只有它才能通过 ContextLoader.getCurrentWebApplicationContext(); 获取