java - Spring根据后缀返回JSON/XML/JSON-P

Question

我已经设置了我的 Controller ，以便它将按照客户端设置的 HTTP Accept-Type header 请求的格式返回数据:

<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
    <property name="messageConverters">
        <list>
            <ref bean="jacksonJSONMessageConverter" />
            <ref bean="jaxbXMLConverter" />
            <ref bean="jsonpMessageConverter" />
        </list>
    </property>
</bean>

Controller 方法示例:

@RequestMapping(value = "/test", method = RequestMethod.POST)
@ResponseBody
public TestObject executeTest()
{
    TestObject t = ...
    // not important, generating t
    return t;
}

例如他们会这样做:http://someurl/test

如果客户端确实可以设置 Accept-Type，它就可以完美地工作。现在，当客户端无法设置 Accept-Type header 时，问题就开始了，我将依赖于要添加后缀的 url，例如:

• http://someurl/test.xml
• http://someurl/test.json
• http://someurl/test.jsonp?callback=fn

我的挑战是如何正确配置 Spring 来做到这一点？

一些建议:

• 使用一些静态方法返回json:Return JSON or View from Spring MVC Controller
• 使用 ResponseEntity In Spring MVC, how can I set the mime type header when using @ResponseBody
• 使用默认 View :http://blog.safaribooksonline.com/2012/03/28/spring-mvc-tip-returning-json-from-a-spring-controller/

还有许多其他解决方案，但似乎没有一个解决方案能够以一个好的、干净的理由满足我的需求。理想情况下，我希望能够做一些干净的事情，例如

@RequestMapping(value = "/test.xml", method = RequestMethod.POST)
@ResponseBody
public TestObject executeTestReturnXML()
{
    TestObject t = executeTest();

    return t; // somehow magically force Spring converter to convert it to XML
}

@RequestMapping(value = "/test.json", method = RequestMethod.POST)
@ResponseBody
public TestObject executeTestReturnJson()
{
    TestObject t = executeTest();

    return t; // somehow magically force Spring converter to convert it to JSON
}

@RequestMapping(value = "/test.jsonp", method = RequestMethod.POST)
@ResponseBody
public TestObject executeTestReturnJsonP(@RequestParam(value = "callback", required = true) String callback)
{
    TestObject t = executeTest();

    return t; // somehow magically force Spring converter to convert it to JSON-P with callback wrapper
}

建议和/或指导将不胜感激!

Answer 1

Spring MVC 3.0+ 引入了ContentNegotiatingViewResolver它具有您所寻求的确切功能。

Implementation of ViewResolver that resolves a view based on the request file name or Accept header.

这篇博文可以帮助您:http://blog.springsource.org/2013/06/03/content-negotiation-using-views/