spring: web学习笔记1异常处理:No adapter for handler

在配置spring web框架的时候，遇到No adapter for handler的异常

前置过程：

自己想实现两种方式的bean的解析，一种是通过手动配置的

即要通过写 <bean id="xxxx" class="xx.xxx.ccc"/>

第二种是通过注解方式实现的

即在public class xxx上面加个注释@Controller，然后又不想在这个地方写上@RequestMapping("/xxx.htm")，即不想把这个请求的url写死，想根据controller的name来自动解析

然后就基本卡壳在这个解析上面了，两种方式都不能很好的兼容。

出现错误的时候的xml是

<?xml version="1.0" encoding="UTF-8"?>
<!-- - DispatcherServlet application context for PetClinic's web tier. -->
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:oxm="http://www.springframework.org/schema/oxm"
    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/oxm http://www.springframework.org/schema/oxm/spring-oxm-3.0.xsd">

    <context:component-scan base-package="com.molly"></context:component-scan>

    <bean id="homePageController" class="com.molly.controller.HomePageController">
        <property name="rantService" ref="rantService"></property>
    </bean>
    <bean id="rantService" class="com.molly.service.RantService"></bean>
    <bean id="sampleController" class="com.molly.controller.SampleController"></bean>

    <bean id="rantsForVehicle" class="com.molly.controller.RantsForVehicleController">
        <property name="rantService" ref="rantService"></property>
    </bean>


    <bean
        class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" />
    <bean
        class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" />
    <!-- this bean with the well known name generates view names for us -->
    <bean id="viewNameTranslator"
        class="org.springframework.web.servlet.view.DefaultRequestToViewNameTranslator" />
    <!-- maps request URLs to Controller names -->
    <bean
        class="org.springframework.web.servlet.mvc.support.ControllerClassNameHandlerMapping" />

      <!-- - This bean resolves specific types of exceptions to corresponding
        logical - view names for error views. The default behaviour of DispatcherServlet
        - is to propagate all exceptions to the servlet container: this will happen
        - here with all other types of exceptions. -->
    <bean
        class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
        <property name="exceptionMappings">
            <props>
                <prop key="org.springframework.web.servlet.PageNotFound">pageNotFound</prop>
                <prop key="org.springframework.dao.DataAccessException">dataAccessFailure</prop>
                <prop key="org.springframework.transaction.TransactionException">dataAccessFailure</prop>
            </props>
        </property>
    </bean>


    <bean id="velocityConfigurer"
        class="org.springframework.web.servlet.view.velocity.VelocityConfigurer">
        <property name="configLocation">
            <value>/WEB-INF/velocity/velocity.properties</value>
        </property>
        <property name="resourceLoaderPath">
            <value>/WEB-INF/templates/</value>
        </property>
        <property name="velocityProperties">
            <props>
                <prop key="directive.foreach.counter.name">
                    loopCoounter
                </prop>
                <prop key="directive.foreach.counter.initial.value">
                    0
                </prop>
                <prop key="input.encoding">UTF-8</prop>
                <prop key="output.encoding">UTF-8</prop>
                <prop key="contentType">text/html;charset=UTF-8</prop>
            </props>
        </property>
    </bean>


    <bean id="viewResolver"
        class="org.springframework.web.servlet.view.velocity.VelocityViewResolver">
        <property name="suffix">
            <value>.vm</value>
        </property>
        <property name="exposeRequestAttributes">
            <value>true</value>
        </property>
        <property name="exposeSessionAttributes">
            <value>true</value>
        </property>
        <property name="contentType">
            <value>text/html;charset=UTF-8</value>
        </property>
        <!-- <property name="toolboxConfigLocation"> <value>/WEB-INF/velocity/toolbox.xml</value>
            </property> -->
    </bean>

</beans>

出错的地方就是，通过指定bean id的那几个，都不能被访问到，会抛错误出来(这几个是没有@Controller这个注解的，直接实现的controller)

但是写了@controller和@RequestMapping的，都可以正常访问

然后加了两个adapter，就可以了

    <bean
        class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter" />
    <bean class="org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter" />

加上这两个bean的处理，就可以用了

参考自google groups：http://groups.google.com/group/gwt-sl/browse_thread/thread/f563b200aa0af307

一点一点搞spring，原理暂时也讲不出个123来，只是暂时解决遇到的问题