406在使用杰克逊、罗马和JAXB2的Spring MVC应用程序(OSGi、Virgo Web Server)中是不可接受的

Question

我刚开始学习Virgo Web Server。我正在尝试在Spring MVC应用程序中使用Jakcson JSON。在这个阶段，我不能获得get请求序列化对象。服务器返回"406不可接受“：

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

在使用Rome和JAXB2时也会出现同样的问题。

以下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

<?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>

dispatcher-servlet.xml

<?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();
 }

}

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

响应头部：

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

问题出在哪里？

Answer 1

如果Spring找不到json转换器，它会返回406。

验证jackson jars是否已实际部署到webapp的lib目录。这就是我的问题所在。

Answer 2

确保在dispatcher-servlet.xml中有<mvc:annotation-driven> -它将Spring配置为使用新的注解，比如@ResponseBody。

我还看到你在上下文配置中有一些混乱- dispatcher-servlet.xml是用来配置DispatcherServlet的上下文的，它不应该在父上下文的contextConfigLocation中指定。

Answer 3

我遇到了完全相同的问题，我所需要的就是将public getter放入java类中。

请参阅：https://stackoverflow.com/a/18228476/20654