大家好，又见面了，我是你们的朋友全栈君。
前文说明，本来项目使用的是springmvc 的模式，然后接口都是使用的是 @Controller @ResponseBody 配置json转换的代码是
代码语言：javascript复制 <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name="messageConverters">
<list>
String 转换器
<ref bean="stringHttpMessageConverter" />
JSON 转换器
<ref bean="jsonHttpMessageConverter" />
</list>
</property>
</bean>
<bean id="stringHttpMessageConverter" class="org.springframework.http.converter.StringHttpMessageConverter" />
<bean id="jsonHttpMessageConverter" class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
<property name="objectMapper">
<bean class="com.fasterxml.jackson.databind.ObjectMapper">
<property name="dateFormat">
<bean class="java.text.SimpleDateFormat">
<constructor-arg type="java.lang.String" value="yyyy-MM-dd HH:mm:ss" />
</bean>
</property>
<property name="serializationInclusion">
<value type="com.fasterxml.jackson.annotation.JsonInclude.Include">NON_NULL</value>
</property>
</bean>
</property>
</bean> 后来想直接使用 @RestController 这个注解直接使用
但是接口却一直报 406错误 网上找了很多解决办法，一般都是说的是 JAR缺少，可是我的不缺。spring 是 4.1.4 版本的
代码语言：javascript复制 <dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>${jackson.version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>${jackson.version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>${jackson.version}</version>
</dependency>还有说是
代码语言：javascript复制<?xml version="1.0" encoding="UTF-8"?>
<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:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context" xmlns:jee="http://www.springframework.org/schema/jee" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:ehcache="http://ehcache-spring-annotations.googlecode.com/svn/schema/ehcache-spring" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation=" http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.1.xsd //这里标准的和版本不一致 4.1.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.1.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-4.1.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.1.xsd http://ehcache-spring-annotations.googlecode.com/svn/schema/ehcache-spring http://ehcache-spring-annotations.googlecode.com/svn/schema/ehcache-spring/ehcache-spring-4.1.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd " default-lazy-init="true">我的也是一样的，没问题。
web.xml配置
代码语言：javascript复制<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0">
<display-name>smk_activity</display-name>
<!-- webSpringMVC 用户后台页面的配置 -->
<!-- actionSpringMVC MVC 配置-->
<servlet>
<servlet-name>actionSpringMVC</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:config/spring/spring-action-config.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>actionSpringMVC</servlet-name>
<url-pattern>*.ext</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>actionSpringMVC</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping> spring 配置
代码语言：javascript复制<?xml version="1.0" encoding="UTF-8"?>
<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:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context" xmlns:jee="http://www.springframework.org/schema/jee" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:ehcache="http://ehcache-spring-annotations.googlecode.com/svn/schema/ehcache-spring" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation=" http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.1.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.1.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-4.1.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.1.xsd http://ehcache-spring-annotations.googlecode.com/svn/schema/ehcache-spring http://ehcache-spring-annotations.googlecode.com/svn/schema/ehcache-spring/ehcache-spring-4.1.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd " default-lazy-init="true">
<aop:aspectj-autoproxy/>
<context:annotation-config />
<context:component-scan base-package="com.smk.activity.action.ext" />
<context:component-scan base-package="com.smk.activity.action.web" />
<context:component-scan base-package="com.cat.sy.action" />
<mvc:interceptors>
<mvc:interceptor>
<mvc:mapping path="/**/*.ext" />
<bean class="com.cat.interceptor.FHandlerInterceptor" />
</mvc:interceptor>
<mvc:interceptor>
<mvc:mapping path="/**/*.do"/>
<bean class="com.cat.interceptor.LoginInterceptor"/>
</mvc:interceptor>
</mvc:interceptors>
<bean id="exceptionMessageAdapter" class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerExceptionResolver">
<property name="messageConverters">
<list>
<!-- Support JSON -->
<bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"/>
</list>
</property>
</bean>
<mvc:annotation-driven>
<mvc:message-converters>
<bean id="jsonHttpMessageConverter" class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
<property name="objectMapper">
<bean class="com.fasterxml.jackson.databind.ObjectMapper">
<property name="dateFormat">
<bean class="java.text.SimpleDateFormat">
<constructor-arg type="java.lang.String" value="yyyy-MM-dd HH:mm:ss" />
</bean>
</property>
<property name="serializationInclusion">
<value type="com.fasterxml.jackson.annotation.JsonInclude.Include">NON_NULL</value>
</property>
</bean>
</property>
</bean>
<bean id="stringHttpMessageConverter" class="org.springframework.http.converter.StringHttpMessageConverter" />
</mvc:message-converters>
</mvc:annotation-driven>
<!-- 视图处理器 -->
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/page/" />
<property name="suffix" value=".jsp" />
</bean>但是还是问题依旧的额，所以追踪源码查看问题。
1.追踪请求路径
其他的就不说了，直接看代码 org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor 方法 ： writeWithMessageConverters
代码语言：javascript复制@SuppressWarnings("unchecked")
protected <T> void writeWithMessageConverters(T returnValue, MethodParameter returnType,
ServletServerHttpRequest inputMessage, ServletServerHttpResponse outputMessage)
throws IOException, HttpMediaTypeNotAcceptableException {
Class<?> returnValueClass = getReturnValueType(returnValue, returnType);
HttpServletRequest servletRequest = inputMessage.getServletRequest();
// 获取支持的文件内型。
List<MediaType> requestedMediaTypes = getAcceptableMediaTypes(servletRequest);
// 获取系统支付的类型
List<MediaType> producibleMediaTypes = getProducibleMediaTypes(servletRequest, returnValueClass);
Set<MediaType> compatibleMediaTypes = new LinkedHashSet<MediaType>();
for (MediaType requestedType : requestedMediaTypes) {
for (MediaType producibleType : producibleMediaTypes) {
//比对是否匹配
if (requestedType.isCompatibleWith(producibleType)) {
compatibleMediaTypes.add(getMostSpecificMediaType(requestedType, producibleType));
}
}
}
//比对不成功，就抛异常出去
if (compatibleMediaTypes.isEmpty()) {
if (returnValue != null) {
throw new HttpMediaTypeNotAcceptableException(producibleMediaTypes);
}
return;
}
List<MediaType> mediaTypes = new ArrayList<MediaType>(compatibleMediaTypes);
MediaType.sortBySpecificityAndQuality(mediaTypes);
MediaType selectedMediaType = null;
for (MediaType mediaType : mediaTypes) {
if (mediaType.isConcrete()) {
selectedMediaType = mediaType;
break;
}
else if (mediaType.equals(MediaType.ALL) || mediaType.equals(MEDIA_TYPE_APPLICATION)) {
selectedMediaType = MediaType.APPLICATION_OCTET_STREAM;
break;
}
}
if (selectedMediaType != null) {
selectedMediaType = selectedMediaType.removeQualityValue();
for (HttpMessageConverter<?> messageConverter : this.messageConverters) {
if (messageConverter.canWrite(returnValueClass, selectedMediaType)) {
returnValue = this.adviceChain.invoke(returnValue, returnType, selectedMediaType,
(Class<HttpMessageConverter<?>>) messageConverter.getClass(), inputMessage, outputMessage);
if (returnValue != null) {
((HttpMessageConverter<T>) messageConverter).write(returnValue, selectedMediaType, outputMessage);
if (logger.isDebugEnabled()) {
logger.debug("Written [" returnValue "] as "" selectedMediaType "" using ["
messageConverter "]");
}
}
return;
}
}
}
if (returnValue != null) {
throw new HttpMediaTypeNotAcceptableException(this.allSupportedMediaTypes);
}
}List requestedMediaTypes = getAcceptableMediaTypes(servletRequest);
在org.springframework.web.accept.ContentNegotiationManager
代码语言：javascript复制 @Override
public List<MediaType> resolveMediaTypes(NativeWebRequest webRequest) throws HttpMediaTypeNotAcceptableException {
for (ContentNegotiationStrategy strategy : this.contentNegotiationStrategies) {
List<MediaType> mediaTypes = strategy.resolveMediaTypes(webRequest);
if (mediaTypes.isEmpty() || mediaTypes.equals(MEDIA_TYPE_ALL)) {
continue;
}
return mediaTypes;
}
return Collections.emptyList();
}继续跟踪 List mediaTypes = strategy.resolveMediaTypes(webRequest);
org.springframework.web.accept.AbstractMappingContentNegotiationStrategy
代码语言：javascript复制 @Override
public List<MediaType> resolveMediaTypes(NativeWebRequest webRequest) throws HttpMediaTypeNotAcceptableException {
String key = getMediaTypeKey(webRequest);
if (StringUtils.hasText(key)) {
//本地缓存中查找KEY key=ext 这里就是我们请求的后缀
//tomcat 本身会自带有一套 MediaType 一般的后缀.html,.json,.js等待会自动转换，但是我们自带的 .ext 是没有的。
MediaType mediaType = lookupMediaType(key);
//第一次请求是一定为空
if (mediaType != null) {
handleMatch(key, mediaType);
return Collections.singletonList(mediaType);
}
//处理找不到的后缀
mediaType = handleNoMatch(webRequest, key);
if (mediaType != null) {
addMapping(key, mediaType);
return Collections.singletonList(mediaType);
}
}
return Collections.emptyList();
}继续跟踪 org.springframework.web.accept.ServletPathExtensionContentNegotiationStrategy
代码语言：javascript复制@Override
protected MediaType handleNoMatch(NativeWebRequest webRequest, String extension)
throws HttpMediaTypeNotAcceptableException {
MediaType mediaType = null;
if (this.servletContext != null) {
String mimeType = this.servletContext.getMimeType("file." extension);
if (StringUtils.hasText(mimeType)) {
mediaType = MediaType.parseMediaType(mimeType);
}
}
if (mediaType == null || MediaType.APPLICATION_OCTET_STREAM.equals(mediaType)) {
MediaType superMediaType = super.handleNoMatch(webRequest, extension);
if (superMediaType != null) {
mediaType = superMediaType;
}
}
return mediaType;
}
这里就看到了。SPRING4.1版本的 是根据后缀 来生成 mimeType 。这里生成了一个类型application/vnd.novadigm.ext 然而我并不能查到是什么玩意
这时候，回到AbstractMessageConverterMethodProcessor
看到自带支持的 mimeType 并没有这个类型，所有抛异常出去了。到这里问题就明了了。自定义的.ext 接口，在spring 4.1 以上会抛出这个文件类型不匹配的异常。
现在开始解决。解决的点就在 org.springframework.web.accept.AbstractMappingContentNegotiationStrategy 方法：resolveMediaTypes
代码语言：javascript复制@Override
public List<MediaType> resolveMediaTypes(NativeWebRequest webRequest) throws HttpMediaTypeNotAcceptableException {
String key = getMediaTypeKey(webRequest);
if (StringUtils.hasText(key)) {
//第一次缓存会返回空
MediaType mediaType = lookupMediaType(key);
if (mediaType != null) {
handleMatch(key, mediaType);
return Collections.singletonList(mediaType);
}
//执行这句代码，处理没有匹配的
mediaType = handleNoMatch(webRequest, key);
if (mediaType != null) {
addMapping(key, mediaType);
return Collections.singletonList(mediaType);
}
}
return Collections.emptyList();
}继续看 org.springframework.web.accept.ServletPathExtensionContentNegotiationStrategy
代码语言：javascript复制 @Override
protected MediaType handleNoMatch(NativeWebRequest webRequest, String extension)
throws HttpMediaTypeNotAcceptableException {
MediaType mediaType = null;
if (this.servletContext != null) {
//从容器中获取 file.ext 的mimeType
String mimeType = this.servletContext.getMimeType("file." extension);
if (StringUtils.hasText(mimeType)) {
mediaType = MediaType.parseMediaType(mimeType);
}
}
if (mediaType == null || MediaType.APPLICATION_OCTET_STREAM.equals(mediaType)) {
MediaType superMediaType = super.handleNoMatch(webRequest, extension);
if (superMediaType != null) {
mediaType = superMediaType;
}
}
return mediaType;
}从这里就知道了解决办法了，
String mimeType = this.servletContext.getMimeType(“file.” extension);
根据file.ext 这个key 来获取mimeType
所以在web.xml 中添加 这个对应的类型就能解决问题
代码语言：javascript复制//可以添加多个
<mime-mapping>
<extension>ext</extension>
<mime-type>application/json</mime-type>
</mime-mapping>
<mime-mapping>
<extension>in</extension>
<mime-type>application/json</mime-type>
</mime-mapping>发布者：全栈程序员栈长，转载请注明出处：https://javaforall.cn/127359.html原文链接：https://javaforall.cn
