个人中心
gpt4 book ai didi

java - 尝试通过 HTTP 为 Spring Web MVC 服务配置 XML 编码时出现 "406 Not Acceptable"

转载 作者：行者123 更新时间：2023-11-30 09:07:20 25 4
gpt4 key购买 nike

捕获我遇到的问题的玩具示例在 github 上.简而言之，我有一项服务需要通过 HTTP 将 XML 编码回。我正在尝试使用 Spring Web MVC 进行设置。需要编码回来的响应对象是 JAXB2 从模式生成的(因此缺少 @XmlRootElement 标记，但生成它的包有一个 ObjectFactory，它提供生成 JAXBElement-s 的方法，这让 XML 编码器很高兴)。我尝试了基于 Google 搜索的不同 spring 上下文配置，这些配置大多是在堆栈溢出时点击这里的帖子，但无法让它们中的任何一个为我工作。

环境:

  • Spring 4.0.5。
  • Tomcat 7.0.5X。

这是一个显示问题的请求/响应周期示例(一些输出已被省略):

$ curl -v -X GET -H "Accept: application/xml" http://localhost:8080/sotaro/say/boo
* Connected to localhost (::1) port 8080 (#0)
> GET /sotaro/say/boo HTTP/1.1
> User-Agent: curl/7.30.0
> Host: localhost:8080
> Accept: application/xml
>
< HTTP/1.1 406 Not Acceptable
* Server Apache-Coyote/1.1 is not blacklisted
< Server: Apache-Coyote/1.1
< Content-Type: text/html;charset=utf-8
< Content-Language: en
< Content-Length: 1067
< Date: Wed, 04 Jun 2014 12:48:44 GMT
<
<html>
  <body>
    <h1>HTTP Status 406 -</h1>
    <p><b>message</b></p>
    <p><b>description</b> <u>The resource identified by this request is only capable of generating responses with characteristics not acceptable according to the request "accept" headers.</u></p>
  </body>
</html>

这是玩具示例的模块。

我尝试过的上下文配置之一:

<?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:aop="http://www.springframework.org/schema/aop"
  xmlns:context="http://www.springframework.org/schema/context" 
  xmlns:tx="http://www.springframework.org/schema/tx"
  xmlns:util="http://www.springframework.org/schema/util" 
  xmlns:mvc="http://www.springframework.org/schema/mvc"
  xmlns:oxm="http://www.springframework.org/schema/oxm"
  xsi:schemaLocation="
  http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
  http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
  http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
  http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
  http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd
  http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
  http://www.springframework.org/schema/oxm http://www.springframework.org/schema/oxm/spring-oxm-4.0.xsd">

  <context:component-scan base-package="io.github.gv0tch0.sotaro"/>

  <bean id="contentNegotiationManager" class="org.springframework.web.accept.ContentNegotiationManagerFactoryBean">
    <property name="favorPathExtension" value="false" />
    <property name="ignoreAcceptHeader" value="false" />
    <property name="useJaf" value="false" />
    <property name="defaultContentType" value="application/xml" />
    <property name="mediaTypes">
      <map>
        <entry key="xml" value="application/xml" />
      </map>
    </property>
  </bean>

  <bean id="xmlConverter" class="org.springframework.http.converter.xml.MarshallingHttpMessageConverter">
    <constructor-arg ref="jaxbMarshaller" />
    <property name="supportedMediaTypes" value="application/xml" />
  </bean>

  <bean id="jaxbMarshaller" class="org.springframework.oxm.jaxb.Jaxb2Marshaller">
    <property name="packagesToScan">
      <list>
        <value>io.github.gv0tch0.sotaro.*</value>
      </list>
    </property>
  </bean>

  <mvc:annotation-driven content-negotiation-manager="contentNegotiationManager">
    <mvc:message-converters register-defaults="false">
      <ref bean="xmlConverter" />
    </mvc:message-converters>
  </mvc:annotation-driven>

</beans>

Controller :

@Controller
public class Say {
  @RequestMapping(value = "/say/{what}", 
                  produces = {MediaType.APPLICATION_XML_VALUE}, 
                  method = RequestMethod.GET)
  public @ResponseBody SayWhat say(@PathVariable("what") String what) {
    return echo(what);
  }
  private SayWhat echo(String what) {
    SayWhat echo = new SayWhat();
    echo.setWhat(what);
    return echo;
  }
}

响应对象(JAXB2 生成):

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "SayWhat", propOrder = {"what"})
public class SayWhat {
  @XmlElement(required = true)
  protected String what;

  public String getWhat() {
      return what;
  }
  public void setWhat(String value) {
    this.what = value;
  }
}

及其生成的模式:

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
           xmlns:tns="urn:io:github:gv0tch0:sotaro"
           targetNamespace="urn:io:github:gv0tch0:sotaro"
           version="0.0.1">
  <xs:element name="say" type="tns:SayWhat" />
  <xs:complexType name="SayWhat">
    <xs:sequence>
      <xs:element name="what" type="xs:string" minOccurs="1" maxOccurs="1" />
    </xs:sequence>
  </xs:complexType>
</xs:schema>

最佳答案

所以罪魁祸首是失踪 JAXBElement -包装响应对象和一个Jaxb2Marshaller配置为支持JAXBElement - 包装响应。

@Controller 变成:

@Controller
public class Say {
  private final static ObjectFactory JAXB_FACTORY = new ObjectFactory();

  @RequestMapping(value = "/say/{what}", 
                  produces = {MediaType.APPLICATION_XML_VALUE}, 
                  method = RequestMethod.GET)
  public @ResponseBody JAXBElement<SayWhat> say(@PathVariable("what") String what) {
    return echo(what);
  }

  private JAXBElement<SayWhat> echo(String what) {
    SayWhat echo = new SayWhat();
    echo.setWhat(what);
    return JAXB_FACTORY.createSay(echo);
  }
}

还有 Jaxb2Marshaller -部分 Spring 配置变为:

<bean id="jaxbMarshaller" class="org.springframework.oxm.jaxb.Jaxb2Marshaller">
  <property name="supportJaxbElementClass" value="true"/>
  <property name="packagesToScan">
    <list>
      <value>io.github.gv0tch0.sotaro</value>
    </list>
  </property>
</bean>

如果 Jaxb2Marshaller 实现发现 JAXB 注释类所在的包包含一个 ObjectFactory 就更好了。能够将响应包装在 JAXBElement 中-s 并使用原始配置开箱即用。

关于java - 尝试通过 HTTP 为 Spring Web MVC 服务配置 XML 编码时出现 "406 Not Acceptable"，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/24040084/

25 4 0
文章推荐： java - 如何在启动到 PlayStore 之前确定应用程序名称
文章推荐： java - which oncreate (bundle) 将在 Activity 中调用
文章推荐： machine-learning - 如何搜索Word2Vec或GloVe Embedding以通过语义关系查找单词
文章推荐： java - url-pattern/* 将 jsp 文件和静态 Assets 作为单独的请求提供
行者123
个人简介

我是一名优秀的程序员,十分优秀！

滴滴打车优惠券免费领取
滴滴打车优惠券
全站热门文章
Copyright 2021 - 2024 cfsdn All Rights Reserved 蜀ICP备2022000587号
广告合作:1813099741@qq.com 6ren.com