在注解@ResponsePayload前加上@PayloadRoot，设置namespace和localPart，然后在方法的参数中添加@RequestPayload注解。

示例代码：

@Endpoint
public class ExampleEndpoint {

    private static final String NAMESPACE_URI = "http://www.example.org/spring/samples";

    @PayloadRoot(namespace = NAMESPACE_URI, localPart = "exampleRequest")
    @ResponsePayload
    public Element handleExampleRequest(@RequestPayload Element requestElement) {
        Document document = requestElement.getOwnerDocument();
        Element responseElement = document.createElementNS(NAMESPACE_URI, "exampleResponse");
        responseElement.setTextContent("Hello World");
        return responseElement;
    }
}