Question

提前感谢任何帮助。

我正在尝试使用我的一个控制器方法来返回JSON。从一个简单的测试开始：

@RequestMapping(value="/myReqPath", method=RequestMethod.GET)
@ResponseBody
public Map<String, String> myJsonMethod() {

    Map<String, String> response = new TreeMap<String, String>();
    response.put("test", "test");

    return response;

}

我的理解是我需要在我的servlet上下文中添加<mvc:annotation-driven/>才能完成此任务。问题是当我添加它时，它会破坏我的自定义AnnotationMethodHandlerAdapter。

[B]如何提取和添加<mvc:annotation-driven/>所需的部分以从控制器返回JSON？[/ B]

以下是我的servlet配置的相关部分：

<!--Skipping this for now...
<mvc:annotation-driven/>
-->

<!-- JSON Marshaling -->
<util:constant id="jsonBasicClassIntrospector"
    static-field="org.codehaus.jackson.map.introspect.BasicClassIntrospector.instance" />
<bean id="jsonJaxbAnnotationIntrospector" 
    class="org.codehaus.jackson.xc.JaxbAnnotationIntrospector" />
<bean id="jsonVisibilityChecker" 
    class="org.codehaus.jackson.map.introspect.VisibilityChecker.Std"
    factory-method="defaultInstance" />
<bean id="jsonDefaultTypeFactory" 
    class="org.codehaus.jackson.map.type.TypeFactory"
    factory-method="defaultInstance" />
<bean id="jsonObjectMapper" class="org.codehaus.jackson.map.ObjectMapper">
    <property name="serializationConfig">
        <bean class="org.codehaus.jackson.map.SerializationConfig">
            <constructor-arg ref="jsonBasicClassIntrospector" />
            <constructor-arg ref="jsonJaxbAnnotationIntrospector" />
            <constructor-arg ref="jsonVisibilityChecker" />
            <constructor-arg><null/></constructor-arg>
            <constructor-arg><null/></constructor-arg>
            <constructor-arg ref="jsonDefaultTypeFactory" />
            <constructor-arg><null/></constructor-arg>
        </bean>
    </property>
    <property name="deserializationConfig">
        <bean class="org.codehaus.jackson.map.DeserializationConfig">
            <constructor-arg ref="jsonBasicClassIntrospector" />
            <constructor-arg ref="jsonJaxbAnnotationIntrospector" />
            <constructor-arg ref="jsonVisibilityChecker" />
            <constructor-arg><null/></constructor-arg>
            <constructor-arg><null/></constructor-arg>
            <constructor-arg ref="jsonDefaultTypeFactory" />
            <constructor-arg><null/></constructor-arg>
        </bean>
    </property>
</bean>

...

<!-- My custom  AnnotationMethodHandlerAdapter... -->
<bean id="sessionArgResolver" class="com.SessionParamArgumentResolver"/>
<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
    <property name="customArgumentResolver" ref="sessionArgResolver"/>
</bean>

按照目前的情况，调用我的控制器方法，然后浏览器返回http状态406： 406不可接受 - [url] http：// localhost：8080 / myApp / myReqPath [/ url]

Answer 1

如果您已有自定义AnnotationMethodHandlerAdapter声明，则只需向其添加HttpMessageConverter个列表：

<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
    <property name="customArgumentResolver" ref="sessionArgResolver"/>
    <property name = "messageConverters">
        <list>
            <bean 
                class = "org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
                <property name = "objectMapper" ref = "jsonObjectMapper" />
            </bean>
        </list>
    </property>
</bean>

Spring配置 - mvc：annotation-driven，AnnotationMethodHandlerAdapter和JSON

1 个答案: