tomcat啟動(dòng)時(shí)沒(méi)有把spring配置文件定義的bean加載進(jìn)來(lái)

tomcat啟動(dòng)時(shí)沒(méi)有把spring配置文件定義的bean加載進(jìn)來(lái)

最近在把自己的之前搭建的那個(gè)通用的ssh框架,配置成dubbo+zookeeper這樣的分布式架構(gòu)。搭建的思路就是把項(xiàng)目的service和controller分離出來(lái)。兩個(gè)項(xiàng)目之間的服務(wù)就通過(guò)zookeeper注冊(cè)和訂閱的方式來(lái)完成。service層的搭建還是比較順利的。在加入了zookeeper和dubbo的相關(guān)配置和分離了controller層的配置后接口服務(wù)能夠自動(dòng)的注冊(cè)到dubbo。


2018-10-15 09-41-26屏幕截圖.png

但是在搭建controller層的項(xiàng)目時(shí)，在相關(guān)的配置完成后，服務(wù)通過(guò)tomcat啟動(dòng)，一開(kāi)始是發(fā)現(xiàn)項(xiàng)目能夠訂閱到service層的服務(wù)的，以為就沒(méi)有錯(cuò)了，但是后面我在測(cè)試項(xiàng)目的整合的redis的時(shí)候發(fā)現(xiàn)controller層的容器沒(méi)有成功初始化redis配置文件中定義的bean對(duì)象。


2018-10-15 09-45-17屏幕截圖.png

（服務(wù)是已經(jīng)訂閱到的）

我在服務(wù)啟動(dòng)后把容器管理的bean對(duì)象信息都打印出來(lái)發(fā)現(xiàn)我spring整合redis配置文件定義的bean都沒(méi)有在里面。

 [DUBBO] Refer dubbo service com.lung.application.inter.TestService from url zookeeper://127.0.0.1:2181/com.alibaba.dubbo.registry.RegistryService?anyhost=true&application=dubbo-project-manager-consumer&check=false&default.delay=-1&default.retries=0&default.timeout=1200000&delay=-1&dubbo=2.5.3&interface=com.lung.application.inter.TestService&methods=queryAreaInfo,getResult&pid=29313&revision=1.0-SNAPSHOT&side=consumer&timestamp=1539567979182, dubbo version: 2.5.3, current host: 172.17.0.1
[INFO ] 2018-10-15 09:46:19,274 method:com.lung.common.utils.ManagerBeansName.init(ManagerBeansName.java:25)
beanDefinitionCount29
roleController
testController
superController
managerBeansName
org.springframework.context.annotation.internalConfigurationAnnotationProcessor
org.springframework.context.annotation.internalAutowiredAnnotationProcessor
org.springframework.context.annotation.internalRequiredAnnotationProcessor
org.springframework.context.annotation.internalCommonAnnotationProcessor
org.springframework.context.event.internalEventListenerProcessor
org.springframework.context.event.internalEventListenerFactory
org.springframework.web.servlet.resource.DefaultServletHttpRequestHandler#0
org.springframework.web.servlet.handler.SimpleUrlHandlerMapping#0
mvcCorsConfigurations
org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping
org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter
org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter
mvcHandlerMappingIntrospector
mvcContentNegotiationManager
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping
org.springframework.format.support.FormattingConversionServiceFactoryBean#0
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter
mvcUriComponentsContributor
org.springframework.web.servlet.handler.MappedInterceptor#0
org.springframework.web.servlet.mvc.method.annotation.ExceptionHandlerExceptionResolver#0
org.springframework.web.servlet.mvc.annotation.ResponseStatusExceptionResolver#0
org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver#0
fastJsonHttpMessageConverter
org.springframework.web.servlet.view.InternalResourceViewResolver#0
multipartResolver
[INFO ] 2018-10-15 09:46:19,541 method:org.springframework.web.servlet.handler.AbstractUrlHandlerMapping.registerHandler(AbstractUrlHandlerMapping.java:362)
Mapped URL path [/**] onto handler 'org.springframework.web.servlet.resource.DefaultServletHttpRequestHandler#0'
[INFO ] 2018-10-15 09:46:19,628 method:org.springframework.web.servlet.handler.AbstractHandlerMethodMapping$MappingRegistry.reg

這是我的springMVC配置文件

<?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" xmlns:aop="http://www.springframework.org/schema/aop"
       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.xsd
       http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">

    <!--<context:property-placeholder ignore-unresolvable="true" location="classpath*:config.properties"/>-->
    <!--1. 掃描 -->
    <context:component-scan
            base-package="com.lung.application,com.lung.common.controller,com.lung.common.utils">
        <!--<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Service"/>-->
    </context:component-scan>
    <!--2.兩個(gè)標(biāo)準(zhǔn)配置 -->
    <!--將springmvc不能處理的請(qǐng)求交給tomcat -->
    <mvc:default-servlet-handler/>
    <!--能支持springmvc更高級(jí)的一些功能，JSR303校驗(yàn)，快捷的ajax...映射動(dòng)態(tài)請(qǐng)求 -->
    <mvc:annotation-driven>
        <mvc:message-converters register-defaults="true">
            <bean class="org.springframework.http.converter.ByteArrayHttpMessageConverter"/>
            <bean class="org.springframework.http.converter.FormHttpMessageConverter"/>
            <bean class="org.springframework.http.converter.xml.SourceHttpMessageConverter"/>
            <ref bean="fastJsonHttpMessageConverter"/>
            <!--<ref bean="jsonMessageConverter"/>-->
        </mvc:message-converters>
    </mvc:annotation-driven>

    <!--jackson配置json為空不輸出-->
    <!--<bean id="jsonMessageConverter"
          class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
        <property name="objectMapper">
            <bean class="com.fasterxml.jackson.databind.ObjectMapper">
                &lt;!&ndash;設(shè)置不輸出null字段&ndash;&gt;
                <property name="serializationInclusion" value="NON_NULL"/>
            </bean>
        </property>
    </bean>-->
    <!-- 使用fastJson來(lái)支持JSON數(shù)據(jù)格式 -->
    <bean id="fastJsonHttpMessageConverter"
          class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter">
        <property name="supportedMediaTypes">
            <list>
                <value>text/html;charset=UTF-8</value>
                <value>application/json</value>
            </list>
        </property>
        <property name="features">
            <list>
                <!-- 避免循環(huán)引用 -->
                <value>DisableCircularReferenceDetect</value>
                <!-- 輸出key時(shí)是否使用雙引號(hào) -->
                <value>QuoteFieldNames</value>
                <!-- 數(shù)值字段如果為null,輸出為0,而非null -->
                <value>WriteNullNumberAsZero</value>
                <!-- List字段如果為null,輸出為[],而非null -->
                <value>WriteNullListAsEmpty</value>
                <!-- 字符類型字段如果為null,輸出為"",而非null -->
                <value>WriteNullStringAsEmpty</value>
                <!-- Boolean字段如果為null,輸出為false,而非null -->
                <value>WriteNullBooleanAsFalse</value>
                <!-- Date的日期轉(zhuǎn)換器 -->
                <value>WriteDateUseDateFormat</value>
            </list>
        </property>
    </bean>

    <!--3.配置視圖解析器，方便頁(yè)面返回-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/pages/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>

    <!--file upload settings-->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="defaultEncoding" value="UTF-8"/>
        <property name="maxUploadSize" value="10485760000"/>
        <property name="maxInMemorySize" value="40960"/>
    </bean>

    <!--攔截器配置-->

</beans>

然后這是web.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xmlns="http://java.sun.com/xml/ns/javaee"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
                        http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
          version="3.0">

    <display-name>Project Web Application</display-name>

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

    <!--1.Spring容器applicationContext.xml -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath*:spring/spring-introduce.xml</param-value>
    </context-param>

    <!--2.springmvc的前端控制器 -->
    <servlet>
        <servlet-name>springDispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath*:/spring/springmvc.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>springDispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <!--3.編碼過(guò)濾 解決post亂碼 -->
    <filter>
        <filter-name>CharacterEncodingFilter</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>CharacterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <!--4、使用Rest風(fēng)格的URI，將頁(yè)面普通的post請(qǐng)求轉(zhuǎn)為指定的delete或者put請(qǐng)求 -->
    <filter>
        <filter-name>HiddenHttpMethodFilter</filter-name>
        <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>HiddenHttpMethodFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    <filter>
        <filter-name>HttpPutFormContentFilter</filter-name>
        <filter-class>org.springframework.web.filter.HttpPutFormContentFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>HttpPutFormContentFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
</web-app>

通過(guò)測(cè)試發(fā)現(xiàn)redis的bean對(duì)象沒(méi)有，報(bào)一個(gè)空指針異常。


2018-10-15 09-53-19屏幕截圖.png

2018-10-15 09-53-42屏幕截圖.png

在這里先給出解決方案：（其實(shí)這個(gè)算是我配置的問(wèn)題了，自己基礎(chǔ)不好包含而且粗心導(dǎo)致的。我的項(xiàng)目地址commonManageProject(mybatis-plus-version分支)
根本原因就是我在web.xml配置springDispatcherServlet的時(shí)候只是把springMVC的配置文件指定了，spring的配置文件沒(méi)有指定。所以導(dǎo)致了tomcat啟動(dòng)后，只加載了pringmvc配置文件指定的bean。（因?yàn)榉植际脚渲煤?，很多原?lái)定義在springMVC配置文件bean都定義在了spring配置文件中）

這個(gè)問(wèn)題在這里我卡住了很久都沒(méi)有解決，一開(kāi)始也是認(rèn)為是我自己的配置問(wèn)題，嘗試著從幾個(gè)方面找原因。
1、通過(guò)單元測(cè)試看看容器中redis對(duì)象是否存在：

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = {"classpath*:/spring/spring-introduce.xml",
        "classpath*:/spring/springmvc.xml"})
public class TestRedis {

    @Autowired
    BaseRedisDao baseRedisDao;

    @Test
    public void TestRedis() {
        try {
            boolean set = baseRedisDao.set("baseRedisKey", "baseRedisvalue");
            System.out.println(set);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

發(fā)現(xiàn)對(duì)象是存在的

[INFO ] 2018-10-15 10:03:57,861 method:com.alibaba.dubbo.config.ReferenceConfig.createProxy(ReferenceConfig.java:423)
 [DUBBO] Refer dubbo service com.lung.application.inter.TestService from url zookeeper://127.0.0.1:2181/com.alibaba.dubbo.registry.RegistryService?anyhost=true&application=dubbo-project-manager-consumer&check=false&default.delay=-1&default.retries=0&default.timeout=1200000&delay=-1&dubbo=2.5.3&interface=com.lung.application.inter.TestService&methods=queryAreaInfo,getResult&pid=30327&side=consumer&timestamp=1539569037813, dubbo version: 2.5.3, current host: 172.17.0.1
[INFO ] 2018-10-15 10:03:57,868 method:com.lung.common.utils.ManagerBeansName.init(ManagerBeansName.java:25)
beanDefinitionCount39
poolConfig
jedisConnectionFactory
redisTemplate
baseRedisDao
com.lung.common.utils.PropertyPlaceholder#0
config
dubbo-project-manager-consumer
com.alibaba.dubbo.config.RegistryConfig
roleServiceImpl
testServiceImpl
roleController
testController
superController
managerBeansName
org.springframework.context.annotation.internalConfigurationAnnotationProcessor
org.springframework.context.annotation.internalAutowiredAnnotationProcessor
org.springframework.context.annotation.internalRequiredAnnotationProcessor
org.springframework.context.annotation.internalCommonAnnotationProcessor
org.springframework.context.event.internalEventListenerProcessor
org.springframework.context.event.internalEventListenerFactory
org.springframework.web.servlet.resource.DefaultServletHttpRequestHandler#0
org.springframework.web.servlet.handler.SimpleUrlHandlerMapping#0
mvcCorsConfigurations
org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping
org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter
org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter
mvcHandlerMappingIntrospector
mvcContentNegotiationManager
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping
org.springframework.format.support.FormattingConversionServiceFactoryBean#0
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter
mvcUriComponentsContributor
org.springframework.web.servlet.handler.MappedInterceptor#0
org.springframework.web.servlet.mvc.method.annotation.ExceptionHandlerExceptionResolver#0
org.springframework.web.servlet.mvc.annotation.ResponseStatusExceptionResolver#0
org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver#0
fastJsonHttpMessageConverter
org.springframework.web.servlet.view.InternalResourceViewResolver#0
multipartResolver
[INFO ] 2018-10-15 10:03:58,045 method:org.springframework.web.servlet.handler.AbstractUrlHandlerMapping.registerHandler(AbstractUrlHandlerMapping.java:362)
Mapped URL path [/**] onto handler 'org.springframework.web.servlet.resource.DefaultServletHttpRequestHandler#0'

2、通過(guò)ClassPathXmlApplicationContext查看spring容器是否把redis的相關(guān)對(duì)象給初始化了：


public class TestSpring {
    public static void main(String[] args) {
        ClassPathXmlApplicationContext classPathXmlApplicationContext =
                new ClassPathXmlApplicationContext("classpath:/spring/spring-introduce.xml");
        int beanDefinitionCount = classPathXmlApplicationContext.getBeanDefinitionCount();
        System.out.println(beanDefinitionCount);
        String[] beanDefinitionNames = classPathXmlApplicationContext.getBeanDefinitionNames();
        for (String str :
                beanDefinitionNames) {
            System.out.println(str);
        }
    }
}

發(fā)現(xiàn)也是正常的

[INFO ] 2018-10-15 10:06:13,113 method:org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:317)
Loading XML bean definitions from URL [file:/home/lung/IdeaProjects/commonManageProject/commons-manager/commons-manager-web/target/classes/dubbo/dubbo-consumer.xml]
[INFO ] 2018-10-15 10:06:13,214 method:
using logger: com.alibaba.dubbo.common.logger.log4j.Log4jLoggerAdapter
10
poolConfig
jedisConnectionFactory
redisTemplate
baseRedisDao
com.lung.common.utils.PropertyPlaceholder#0
config
dubbo-project-manager-consumer
com.alibaba.dubbo.config.RegistryConfig
roleServiceImpl
testServiceImpl
[INFO ] 2018-10-15 10:06:14,425 method:com.alibaba.dubbo.config.AbstractConfig$1.run(AbstractConfig.java:450)

無(wú)奈之下，我重新去復(fù)習(xí)一下springMVC的相關(guān)基礎(chǔ)了，后面發(fā)現(xiàn)自己好像在配置分布式服務(wù)，把spring的配置做了更加細(xì)分的解耦后，我在web.xml配置servlet時(shí)只聲明的配置文件是不行的，這個(gè)時(shí)候需要把其他spring配置文件也指定才行。
所以：

 <!--2.springmvc的前端控制器 -->
    <servlet>
        <servlet-name>springDispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath*:/spring/springmvc.xml,classpath*:/spring/applicationContext-*.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>springDispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

修改成上面后測(cè)試接口就正常了：


2018-10-15 10-12-21屏幕截圖.png

謹(jǐn)記?。?！

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