406使用Jackson,Rome和JAXB2在Spring MVC应用程序(OSGi,Virgo Web Server)中不可接受

Question

我刚开始学习Virgo Web Server.我正在尝试使用Spring MVC应用程序中的Jakcson JSON.在这个阶段,我无法获得GET请求序列化对象.服务器返回"406 Not Acceptable":

The resource identified by this request is only capable of generating responses with characteristics not acceptable according to the request "accept" headers ().

使用Rome和JAXB2时会出现同样的问题.

这是项目配置文件和代码:

片段pom.xml:

<dependency>
  <groupId>org.codehaus.jackson</groupId>
  <artifactId>com.springsource.org.codehaus.jackson</artifactId>
  <version>1.0.0</version>
</dependency>
<dependency>
  <groupId>org.codehaus.jackson</groupId>
  <artifactId>com.springsource.org.codehaus.jackson.mapper</artifactId>
  <version>1.0.0</version>
</dependency>

MANIFEST.MF

Manifest-Version: 1.0
Import-Bundle: com.springsource.org.apache.taglibs.standard;version="[
 1.1.2,1.3)",com.springsource.org.codehaus.jackson;version="[1.0.0,1.0
 .0]",com.springsource.org.codehaus.jackson.mapper;version="[1.0.0,1.0
 .0]"
Bundle-Version: 2.3.0
Tool: Bundlor 1.0.0.RELEASE
Bundle-Name: GreenPages Web
Import-Library: org.springframework.spring;version="[3.0, 3.1)"
Bundle-ManifestVersion: 2
Bundle-SymbolicName: greenpages.web
Web-ContextPath: greenpages
Import-Package: javax.servlet.jsp.jstl.core;version="[1.1.2,1.2.0)",ja
 vax.sql,org.apache.commons.dbcp,org.eclipse.virgo.web.dm;version="[2.
 0.0, 3.0.0)",org.springframework.core.io;version="[3.0.0.RELEASE,3.1.
 0)",org.springframework.stereotype;version="[3.0.0.RELEASE,3.1.0)",or
 g.springframework.ui;version="[3.0.0.RELEASE,3.1.0)",org.springframew
 ork.web.bind.annotation;version="[3.0.0.RELEASE,3.1.0)",org.springfra
 mework.web.servlet.mvc.annotation;version="[3.0.0.RELEASE,3.1.0)",org
 .springframework.web.servlet.view;version="[3.0.0.RELEASE,3.1.0)"

web.xml中

<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">

  <welcome-file-list>
    <welcome-file>/WEB-INF/pages/index.jsp</welcome-file>
  </welcome-file-list>

  <!-- CONFIGURE A PARENT APPLICATION CONTEXT -->
  <context-param>
    <param-name>contextClass</param-name>
    <param-value>org.eclipse.virgo.web.dm.ServerOsgiBundleXmlWebApplicationContext</param-value>
  </context-param>

  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>/WEB-INF/applicationContext.xml</param-value>
  </context-param>

  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>

  <!-- DISPATCHER SERVLET CONFIG -->
    <servlet>
        <servlet-name>dispatcher</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>dispatcher</servlet-name>
        <url-pattern>*.htm</url-pattern>
    </servlet-mapping>

</web-app>

调度员servlet.xml中

<?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:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/tx"
       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/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">

    <context:component-scan base-package="greenpages.web"/>

    <!-- Configures the @Controller programming model -->
    <mvc:annotation-driven />

    <bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping"/>

    <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
        <property name="prefix" value="/WEB-INF/pages/"/>
        <property name="suffix" value=".jsp"/>
    </bean>

</beans>

GreenPagesController.java

package greenpages.web;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
public class GreenPagesController {

 @RequestMapping("/home.htm")
 public void home() {
 }

 // MappingJacksonHttpMessageConverter (requires Jackson on the classpath - particularly useful for serving JavaScript clients that expect to work with JSON)
 @RequestMapping(value="/json.htm", method=RequestMethod.POST)
 public @ResponseBody String readJson(@RequestBody JavaBean bean) {
  return "Read from JSON " + bean;
 }

 @RequestMapping(value="/json.htm", method=RequestMethod.GET)
 public @ResponseBody Object writeJson() {
  return new Object();
 }

}

的index.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
  <head>
   <title>Simple jsp page</title>
   <script type="text/javascript" src="/greenpages/scripts/jquery-1.4.4.min.js"></script>
   <script type="text/javascript">
  $.getJSON("json.htm", function(message) {
   console.log(message);
  });
   </script>
  </head>
  <body>

  <form action="test.htm" method="get">
      <input type="text" name="name">
      <input type="submit">
  </form>

  </body>
</html>

AJAX请求http:// localhost:8080/greenpages/json.htm:来自Firebug的请求标头:

GET /greenpages/json.htm HTTP/1.1
Host: localhost:8080
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.12) Gecko/20101026 Firefox/3.6.12
Accept: application/json, text/javascript, */*; q=0.01
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 115
Connection: keep-alive
X-Requested-With: XMLHttpRequest
Referer: http://localhost:8080/greenpages/
Cookie: JSESSIONID=18000E4E096D7978F61F5D1E8105B784; JSESSIONID=35FB0925786699EC587A1B64F30517AD

响应标题:

HTTP/1.1 406 Not Acceptable
Server: Apache-Coyote/1.1
Content-Type: text/html;charset=utf-8
Content-Length: 1070
Date: Tue, 07 Dec 2010 11:15:58 GMT

可能是什么问题？

Answer 1

如果找不到json转换器,Spring会回退到406.

验证jackson jar实际上是否已部署到webapp的lib目录中.这是我的问题.

Answer 2

确保你有<mvc:annotation-driven>in dispatcher-servlet.xml- 它配置Spring使用新的注释,如@ResponseBody.

此外,我发现您在上下文配置中有一些混淆 - dispatcher-servlet.xml用于配置DispatcherServlet上下文,不应contextConfigLocation在父上下文中指定.

Answer 3

有关详细信息，请参阅http://www.checkupdown.com/status/E406.html。您的客户端应用程序告诉服务器它不会接受发回的数据类型。

我不熟悉您正在使用的库等，但您应该能够以编程方式（或通过 Firebug 等）查看您的接受标头以查看正在设置的内容。希望您可以在源代码/配置中找到它。

据我猜测，您的客户端要求返回 JSON，而您的服务器没有发送它。