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使用spring 搭建的mvc。
web.xml:
<!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> <servlet> <servlet-name>appServlet</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/classes/spring/applicationContext.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>appServlet</servlet-name> <url-pattern>/*</url-pattern> </servlet-mapping> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <context-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/classes/spring/applicationContext.xml </param-value> </context-param> <listener> <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class> </listener> <context-param> <param-name>log4jConfigLocation</param-name> <param-value>classpath:log4j.properties</param-value> </context-param> </web-app>applicationContext.xml:配置注解扫描路径,数据源和viewResolver
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:task="http://www.springframework.org/schema/task" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.1.xsd http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.1.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd"> <context:property-placeholder location="classpath:jdbc.properties" /> <context:annotation-config /> <context:component-scan base-package="org.yunzhong.comments.model.dao, org.yunzhong.comments.model.service, org.yunzhong.comments.controller, org.yunzhong.comments.filter" /> <tx:annotation-driven /> <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close"> <property name="driverClassName" value="${jdbc.driverClass}" /> <property name="url" value="${jdbc.url}" /> <property name="username" value="${jdbc.user}" /> <property name="password" value="${jdbc.password}" /> <property name="initialSize"> <value>1</value> </property> <property name="maxActive"> <value>50</value> </property> <property name="maxWait"> <value>10000</value> </property> <property name="minIdle"> <value>1</value> </property> <property name="minEvictableIdleTimeMillis"> <value>300000</value> </property> <property name="validationQuery"> <value>SELECT 1</value> </property> <property name="testWhileIdle"> <value>true</value> </property> <property name="timeBetweenEvictionRunsMillis"> <value>60000</value> </property> <property name="testOnBorrow"> <value>false</value> </property> <property name="testOnReturn"> <value>false</value> </property> </bean> <bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean"> <property name="dataSource" ref="dataSource" /> <property name="packagesToScan"> <list> <value>org.yunzhong.comments.model.entity</value> </list> </property> <property name="hibernateProperties"> <props> <prop key="hibernate.dialect"> org.hibernate.dialect.MySQLDialect</prop> <prop key="hibernate.current_session_context_class">org.springframework.orm.hibernate4.SpringSessionContext </prop> </props> </property> </bean> <bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager"> <property name="sessionFactory"> <ref bean="sessionFactory" /> </property> </bean> <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="viewClass" value="org.springframework.web.servlet.view.JstlView" /> <property name="prefix"> <value>/WEB-INF/pages/</value> </property> <property name="suffix"> <value>.jsp</value> </property> </bean> </beans>页面目录(不能上传图片,所以只能如下打出目录结构):
webapp:
WEB-INF:
pages:
home.jsp
controller:
package org.yunzhong.comments.controller; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.servlet.ModelAndView; /** * @author wangyzh * @date 2014年11月24日 下午2:29:47 */ @Controller public class FirstLoadController { private static final Log log = LogFactory.getLog(FirstLoadController.class); @RequestMapping(value = "/home") public ModelAndView home() { log.info("home page."); ModelAndView model = new ModelAndView(); model.setViewName("home"); return model; } @RequestMapping(value = "/") public ModelAndView homeBase() { log.info("base directory page."); ModelAndView model = new ModelAndView(); model.setViewName("home"); return model; } }
问题描述:
访问根路径,后台控制器可以执行到:
log.info("base directory page.");但是浏览器仅得到404的错误。
求大神帮忙看看,谢谢了。
如果配置了 /* 那么会强制把所有请求的转给这个 servlet 处理,其他 servlet-mapping 均会被忽略;
而 / 表示默认 servlet,即在没有其他的 servlet 可以处理时,就被选中。
如果你使用的是 tomcat,你可以看一下 tomcat_base/conf/web.xml
里面有两个 servlet:default 和 jsp
因为你使用了 /*,所以当返回 jsp view 的时候,实际上是执行了 forward("home.jsp")
tomcat 在处理 home.jsp 的时候,因为使用了强制的 /* 映射, appServlet 被匹配到,
而 controller 里匹配不到 home.jsp 的处理方法,自然就是 404 了
你可以这样更改你的配置:
<servlet-mapping>
<!-- 假如静态内容css和js放在 static 目录下,由容器定义的 default servlet 处理 -->
<servlet-name>default</servlet-name>
<url-pattern>/static/*</url-pattern>
</servlet-mapping>
<servlet-mapping>
<!-- 把 appServlet 当做默认 servlet -->
<servlet-name>appServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>