406在Spring MVC项目中使用restFul webService时出错。返回String时webService工作但其他数据类型失败 [英] 406 Error when consuming restFul webService in Spring MVC project. The webService works when returning a String but fails for other data types

问题描述

这是我的春天servlet片段。我的pom文件也添加了jackson依赖项，但我无法弄清楚为什么我得到这个406.

This is a snippet my spring servlet. My pom file has the jackson dependencies added as well but I just can't figure out why I'm getting this 406.

...
    <mvc:annotation-driven/>                
    <context:component-scan base-package="com.ourcalendar.*"/>      
    <!-- Add JPA support -->
    <bean id="emf" class=
    "org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    <property name="loadTimeWeaver">
    <bean class=
    "org.springframework.instrument.classloading.InstrumentationLoadTimeWeaver"/>
    </property>
    </bean> 
    <!-- Add Transaction support -->
    <bean id="myTxManager"
    class="org.springframework.orm.jpa.JpaTransactionManager">
    <property name="entityManagerFactory" ref="emf"/>
    </bean> 
    <!-- Use @Transaction annotations for managing transactions -->   
    <tx:annotation-driven transaction-manager="myTxManager" />    
    <!-- adding view resolver to show jsp's on browser -->
    <bean id="smViewResolver"
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/" />
        <property name="suffix" value=".jsp" />
    </bean>     
   </beans>

我的Pom文件有jackson依赖项

My Pom file has jackson dependencies

....
    <dependency>
   <groupId>com.fasterxml.jackson.core</groupId>
   <artifactId>jackson-databind</artifactId>
   <version>2.4.0-rc3</version>
    </dependency>
    <dependency>
       <groupId>org.codehaus.jackson</groupId>
       <artifactId>jackson-mapper-asl</artifactId>
       <version>1.9.12</version>
   </dependency>
   <dependency>
       <groupId>org.codehaus.jackson</groupId>
       <artifactId>jackson-core-asl</artifactId>
       <version>1.9.12</version>
    </dependency>
......

这是我的webService

Here is my webService

    @Controller
    public class GetEvents {
    @Autowired
    private EventDao eventDao;
    @RequestMapping(value = "/getEvents", method = RequestMethod.GET)
    @ResponseBody
    public /*List<event>*/ JSONArray getAllEvents()
    {

    JSONObject event =new JSONObject();
    JSONArray theArray = new JSONArray();       
    for (Event e : eventDao.getAllEvents()) {           
        event.put("id", e.getEventsID());
        event.put("title", e.getTitle());
        event.put("description", e.getDescription());
        event.put("start", e.getStart());
        event.put("end", e.getEnd());
        event.put("user", e.getUser());
        theArray.put(event);
    }

    System.out.println("call");
    return theArray;        
    //return eventDao.getAllEvents();


}

}

我的事件类看起来像这样

My events class looks like this

    package com.ourcalendar.model;        
    import java.io.Serializable;
    import java.util.Date;        
    import javax.persistence.Column;
    import javax.persistence.Entity;
    import javax.persistence.GeneratedValue;
    import javax.persistence.GenerationType;
    import javax.persistence.Id;
    import javax.persistence.Table;        
    import org.codehaus.jackson.map.annotate.JsonSerialize;
    import org.codehaus.jackson.map.ser.std.DateSerializer;


    @Entity
    @NamedQuery(name="Events.GetAll", query="SELECT e FROM Event e ORDER BY e.id") 
    @Table(name="events_tbl")
    public class Event implements Serializable  {

    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    @Id 
    @Column(name="eventsId")
    @GeneratedValue(strategy=GenerationType.AUTO)
    private Integer eventsID;

    @Column(name="title")
    private String title;

    @Column(name="description")
    private String description;


    @Column(name="start")
    private Date start;


    @Column(name="end")
    private Date end;

    @Column(name="user")
    private String user;


    public Event()
    {

    }


    public Event(Integer eventsID, String title, String description,
            Date start, Date end, String user) {
        super();
        this.eventsID = eventsID;
        this.title = title;
        this.description = description;
        this.start = start;
        this.end = end;
        this.user = user;
    }


    public Integer getEventsID() {
        return eventsID;
    }
    public void setEventsID(Integer eventsID) {
        this.eventsID = eventsID;
    }


    public String getTitle() {
        return title;
    }
    public void setTitle(String title) {
        this.title = title;
    }
    public String getDescription() {
        return description;
    }
    public void setDescription(String description) {
        this.description = description;
    }
    @JsonSerialize(using=DateSerializer.class)
    public Date getStart() {
        return start;
    }
    public void setStart(Date start) {
        this.start = start;
    }

    @JsonSerialize(using=DateSerializer.class)
    public Date getEnd() {
        return end;
    }
    public void setEnd(Date end) {
        this.end = end;
    }
    public String getUser() {
        return user;
    }
    public void setUser(String user) {
        this.user = user;
    }
}

最后但并非最不重要的是这里是我的EventsDao

And last but not least here's my EventsDao

  @Component
  public class EventDao {

    // Injected database connection:
    @PersistenceContext private EntityManager em;

    // Stores a new Event:
    @Transactional
    public void persist(Event event) {
        em.persist(event);
    }

 // Retrieves all the Events:
    public List<Event> getAllEvents() {
        TypedQuery<Event> query = em.createNamedQuery("Events.GetAll", Event.class);        
        List<Event> results = query.getResultList();
        return results;

    }
}

推荐答案

所以经过多次来回，我终于得到了这个工作。 spring 3.1 xsd位置似乎存在问题。将其更改为3.2并根据所请求路径的扩展禁用获取媒体类型（见下文）后，它可以正常工作。

So after much back and forth I finally got this to work. There seems to be an issue with spring 3.1 xsd location. After changing it to 3.2 and disabling the getting of media type based on the extension of the requested path (see below) it worked.

<?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:mvc="http://www.springframework.org/schema/mvc"
        xmlns:context="http://www.springframework.org/schema/context"
        xmlns:tx="http://www.springframework.org/schema/tx"
        xsi:schemaLocation="http://www.springframework.org/schema/mvc  
        http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
        http://www.springframework.org/schema/security 
        http://www.springframework.org/schema/security/spring-security-3.2.xsd
        http://www.springframework.org/schema/beans  
        http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
        http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context-3.2.xsd
        http://www.springframework.org/schema/tx 
        http://www.springframework.org/schema/tx/spring-tx-3.2.xsd">

  <context:component-scan base-package="com.ourcalendar.*"/>     
  <mvc:annotation-driven content-negotiation-manager="contentNegotiationManager"/>
  <bean id="contentNegotiationManager"  
     class="org.springframework.web.accept.ContentNegotiationManagerFactoryBean">
     <!-- Turn off working out content type based on URL file extension, should fall back to looking at the Accept headers -->
  <property name="favorPathExtension" value="false" />
  </bean>
 .........................................

有关进一步说明，请参阅以下链接。
http://docs.spring.io/spring-framework/docs/3.2.x/spring-framework-reference/html/mvc.html#mvc-config-content-negotiation

for further explanation refer to the below link. http://docs.spring.io/spring-framework/docs/3.2.x/spring-framework-reference/html/mvc.html#mvc-config-content-negotiation

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