在Spring 3.2 MVC中实现API版本的API版本 [英] API versioning with fall-through in Spring 3.2 MVC

问题描述

我正在将现有的Web服务移植到Spring 3.2。我需要版本化的API，并为每个新版本都有一个控制器。我不想在较新的控制器中重新定义方法，而是想在最近找不到它时自动将请求映射到旧控制器。

I'm porting an existing web service to Spring 3.2. I need versioned APIs and have a controller for every new version. I do not want to re-defined methods in newer Controllers and instead want to automatically map requests to old controller if it's not found in the latest.

例如，如果 ControllerV1 有 / home 和 / login 和 ControllerV2 有 / login ，然后我希望请求像这样路由。

For example, if ControllerV1 has /home and /login and ControllerV2 has /login, then I want requests to be routed like this.

/home -> ControllerV1
/v1/home -> ControllerV1
/v2/home -> ControllerV1

/login -> ControllerV1
/v1/login -> ControllerV1
/v2/login -> ControllerV2

一个选项是在 @RequestMapping 。但是，这意味着每当在较新版本中添加API时，都会从所有旧控件中删除路径。实现这一目标最优雅的方法是什么？

One option would be to provide multiple paths in @RequestMapping. However, that would mean removing paths from all older controllesr whenever adding the API in a newer version. What is the most elegant way to achieve this?

推荐答案

我建议只使用继承：

Version1Controller.java

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
@RequestMapping("v1/")
public class Version1Controller {

    @ResponseBody
    @RequestMapping("foo")
    public String foo() {
        return "Foo 1";
    }

    @ResponseBody
    @RequestMapping("bar")
    public String bar() {
        return "bar 1";
    }
}

Version2Controller.java

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
@RequestMapping({ "v2/", "latest/" })
public class Version2Controller extends Version1Controller {

    @Override
    @ResponseBody
    @RequestMapping("bar")
    public String bar() {
        return "bar 2";
    }

}

这里你将有以下网址映射：

Here you will have following urls mapped:

• v1 / foo - 返回Foo 1


• v2 / foo - 返回Foo 1 - 继承自版本1


• v1 / bar - 返回Bar 1


• v2 / bar - 返回Bar 2 - 从版本1覆盖行为。


• latest / foo - 与 v2 / foo相同


• latest / bar - 与 v2 / bar相同

• v1/foo - returning "Foo 1"
• v2/foo - returning "Foo 1" - inherited from Version 1
• v1/bar - returning "Bar 1"
• v2/bar - returning "Bar 2" - overriding behavior from Version 1.
• latest/foo - same as v2/foo
• latest/bar - same as v2/bar

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