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:
?
1
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。
servlet-mapping 中的 /* 和 / 是有特殊含义的:
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>
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