Spring MVC @ResponseBody 返回一个 Map 产生“错误 406 NOT ACCEPTABLE" [英] Spring MVC @ResponseBody returning a Map produces "Error 406 NOT ACCEPTABLE"

问题描述

我在尝试设置 @ResponseBody 以返回集合时遇到问题.我在类路径中有 JAXB jar，但我没有设置任何 ContentNegotiatingViewResolver.

I'm having a problem trying to set up @ResponseBody to return a collection. I have JAXB jars in the classpath and I didn't set up any ContentNegotiatingViewResolver.

这是我的简单对象:-

@XmlRootElement(name = "test-object")
@XmlAccessorType(XmlAccessType.FIELD)
public class TestObject implements Serializable {

    @XmlAttribute
    private int id;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }
}

我编写了一个返回单个对象的简单测试......这没有问题，我能够看到生成的 XML:-

I wrote a simple test that returns a single object... this works without problem, and I'm able to see the generated XML:-

@RequestMapping(value = "one", method = RequestMethod.GET)
public @ResponseBody TestObject getSingleObject() {
    TestObject obj = new TestObject();
    obj.setId(1);

    return obj;
}

我真正想要的是返回一个对象列表.阅读后，似乎这样做的方法是将列表放在地图中并返回地图:-

What I really want is to return a list of objects. After reading around, it seems like the way to do so is to place the list in a map and return the map:-

@RequestMapping(value = "all", method = RequestMethod.GET)
public @ResponseBody Map<String, ? extends Object> getAllObjects() {
    TestObject obj1 = new TestObject();
    obj1.setId(1);

    TestObject obj2 = new TestObject();
    obj2.setId(2);

    List<TestObject> list = Arrays.asList(obj1, obj2);

    return Collections.singletonMap("all-objects", list);
}

当我执行上述操作时，我收到错误 406 不可接受".

When I execute the above, I'm getting "Error 406 Not Acceptable".

我在这里做错了什么?如果有什么不同，我会在 Jetty 6.1 上运行.

What did I do wrong here? I'm running on Jetty 6.1 if that makes a difference.

谢谢.

推荐答案

需要在pom.xml中添加这两个依赖！

You need these two dependencies added in the pom.xml!

<dependency>
    <groupId>org.codehaus.jackson</groupId>
    <artifactId>jackson-core-lgpl</artifactId>
    <version>1.8.1</version>
</dependency>

<dependency>
    <groupId>org.codehaus.jackson</groupId>
    <artifactId>jackson-mapper-lgpl</artifactId>
    <version>1.8.1</version>
</dependency>

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