使用JAXB解组/编组List< String> [英] Using JAXB to unmarshal/marshal a List<String>

问题描述

我正在尝试创建一个非常简单的REST服务器。我只有一个将返回字符串列表的测试方法。这是代码：

I'm trying to create a very simple REST server. I just have a test method that will return a List of Strings. Here's the code:

@GET
@Path("/test2")
public List test2(){
    List list=new Vector();
    list.add("a");
    list.add("b");
    return list;
}

它出现以下错误：

SEVERE: A message body writer for Java type,
class java.util.Vector, and MIME media type,
application/octet-stream, was not found

我希望JAXB对String，Integer等简单类型有默认设置。我猜不是。这就是我想象的：

I was hoping JAXB had a default setting for simple types like String, Integer, etc. I guess not. Here's what I imagined:

<Strings>
  <String>a</String>
  <String>b</String>
</Strings>

使这种方法有效的最简单方法是什么？

What's the easiest way to make this method work?

推荐答案

我使用@LiorH的例子并将其扩展为：

I used @LiorH's example and expanded it to:

@XmlRootElement(name="List")
public class JaxbList<T>{
    protected List<T> list;

    public JaxbList(){}

    public JaxbList(List<T> list){
        this.list=list;
    }

    @XmlElement(name="Item")
    public List<T> getList(){
        return list;
    }
}

注意，它使用泛型所以您可以将其与String之外的其他类一起使用。现在，应用程序代码很简单：

Note, that it uses generics so you can use it with other classes than String. Now, the application code is simply:

    @GET
    @Path("/test2")
    public JaxbList test2(){
        List list=new Vector();
        list.add("a");
        list.add("b");
        return new JaxbList(list);
    }

为什么JAXB包中不存在这个简单类？有人在别处看到类似的东西吗？

Why doesn't this simple class exist in the JAXB package? Anyone see anything like it elsewhere?

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