Spring 配置时一些问题

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在今天看学弟们的一些作业的时候,发现了他们在web.xml中只是配置了

<!--中央控制器  -->  <servlet>    <servlet-name>springmvc</servlet-name>    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>  </servlet>  <servlet-mapping>    <servlet-name>springmvc</servlet-name>    <url-pattern>*.do</url-pattern>  </servlet-mapping>  <welcome-file-list>    <welcome-file>login.jsp</welcome-file>  </welcome-file-list>
只是配置了这些还有一个springmvc-servlet.xml文件就可以实现spring注入式开发

下面是他们的springmvc-servlet.xml文件

<beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"xmlns:context="http://www.springframework.org/schema/context"xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd "><context:component-scan base-package="cn.itcast.springmvc"/> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"><property name="prefix" value="WEB-INF/jsp/"></property><property name="suffix" value=".jsp"></property></bean></beans>

里面只有一个扫描注解和视图解析器就可以实现简单的登录,然后我试了一下我的代码更改成这样竟然不行之后我又仔细的看了一遍,发现,我的扫描注解在spring.xml中视图解析器在spring-mvc.xml中,然后我的web.xml里面写了配置属性文件和添加spring监听器下面是我的spring.xml等的源码

spring.xml

<?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:mvc="http://www.springframework.org/schema/mvc"       xmlns:p="http://www.springframework.org/schema/p"       xmlns:context="http://www.springframework.org/schema/context"       xmlns:aop="http://www.springframework.org/schema/aop"       xmlns:tx="http://www.springframework.org/schema/tx"       xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans-3.0.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsdhttp://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsdhttp://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsdhttp://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">    <!-- 引入属性文件 --><!-- <context:property-placeholder location="classpath:config.properties" /> --><!-- mvc注解驱动 --><mvc:annotation-driven /><!-- 一旦有扫描器的定义mvc:annotation-driven就不需要写了,因为扫描器已经有了注解驱动的功能 --><!-- spring可以自动去扫描base-pack下面或者子包下面的java文件,如果扫描到有@Component @Controller@Service等这些注解的类,则把这些类注册为bean --><!-- <context:component-scan base-package="www.csdn.net"/> --><context:component-scan base-package="com.csdn.www"><!-- 排除某个注解 --><!-- <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Service"/> --></context:component-scan>   </beans>

spring-mvc.xml
<?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:mvc="http://www.springframework.org/schema/mvc"xmlns:context="http://www.springframework.org/schema/context"xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd "><!-- 避免IE执行AJAX时,返回JSON出现下载文件 --><bean id="mappingJacksonHttpMessageConverter" class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"><property name="supportedMediaTypes"><list><value>text/html;charset=UTF-8</value></list></property></bean><!-- 前缀+ viewName +后缀 --><bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"><!-- webroot到某一指定的文件夹的路径 (前缀)--><property name="prefix" value="/WEB-INF/view/"></property><!-- 后缀 --><property name="suffix" value=".jsp"></property></bean><!-- 配置springmvc的上传功能   id必须是multipartResolver --><bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"><!-- maxUploadSize:文件上传的最大值以byte为单位 --><property name="maxUploadSize" value="102400000"></property></bean></beans>
web.xml

<?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" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"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></display-name><context-param><param-name>contextConfigLocation</param-name><param-value>classpath:spring.xml</param-value></context-param><filter><description>字符集过滤器</description><filter-name>encodingFilter</filter-name><filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class><init-param><description>字符集编码</description><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><description>spring监听器</description><listener-class>org.springframework.web.context.ContextLoaderListener</listener-class></listener><!-- spring mvc servlet --><servlet><description>spring mvc servlet</description><servlet-name>springMvc</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><init-param><description>spring mvc 配置文件</description><param-name>contextConfigLocation</param-name><param-value>classpath:spring-mvc.xml</param-value></init-param><load-on-startup>1</load-on-startup></servlet><servlet-mapping><servlet-name>springMvc</servlet-name><url-pattern>/</url-pattern></servlet-mapping><servlet-mapping><servlet-name>default</servlet-name><url-pattern>*.js</url-pattern></servlet-mapping><servlet-mapping><servlet-name>default</servlet-name><url-pattern>*.css</url-pattern></servlet-mapping><servlet-mapping><servlet-name>default</servlet-name><url-pattern>*.png</url-pattern></servlet-mapping></web-app>

然后就是大家来找茬了呗

我发现他所有的spring的注解扫包和视图解析器在一个xml文件中,叫springmvc-servlet.xml文件中,然后我把他的springmvc-servlet.xml copy到我的项目中

并且把

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

和分发器中的

<init-param><description>spring mvc 配置文件</description><param-name>contextConfigLocation</param-name><param-value>classpath:spring-mvc.xml</param-value></init-param><load-on-startup>1</load-on-startup>

还有监听器

<listener><description>spring监听器</description><listener-class>org.springframework.web.context.ContextLoaderListener</listener-class></listener>

注释掉了,发现启动没有问题,但是一执行跳转出错了,后台说找不到一个叫做springMvc-servlet.xml文件的错误,可是我明明都没有配置这个东西怎么会出现这个错误呢?

然后重新启动了一下,启动依旧没有问题,然后我看了一下错误日志,原来是当有请求经过拦截器的时候拦截器会去加载一个默认的配置文件,可是他的叫springmvc-selvlet.xml文件都行我的为什么不行,仔细查看配置文件发现,他的分发器中的servlet-name写的是springmvc而我的是springMvc,感觉就是他搞得事情,改一下,改成springmvc就可以了,总结出来如果你没有

<init-param><description>spring mvc 配置文件</description><param-name>contextConfigLocation</param-name><param-value>classpath:spring-mvc.xml</param-value></init-param>

这个配置,那么你需要在WEN-INF下面建立一个以servlet-name开头加上-servlet.xml结尾的一个配置文件,里面需要添加spring需要的一些属性配置

<servlet><description>spring mvc servlet</description><servlet-name>springMvc</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class></servlet>
 

这个配置文件感觉有点绕。。记录下来,以防止以后再被同样的问题难住


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