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
xxx-servlet.xml
<?
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