使用Spring可以制作一个可选的路径变量吗? [英] With Spring can I make an optional path variable?

问题描述

在Spring 3.0中，我可以有一个可选的路径变量吗?

With Spring 3.0, can I have an optional path variable?

例如

@RequestMapping(value = "/json/{type}", method = RequestMethod.GET)
public @ResponseBody TestBean testAjax(
        HttpServletRequest req,
        @PathVariable String type,
        @RequestParam("track") String track) {
    return new TestBean();
}

在这里，我想/json/abc或/json调用相同的方法.
一种明显的解决方法是将type声明为请求参数:

Here I would like /json/abc or /json to call the same method.
One obvious workaround declare type as a request parameter:

@RequestMapping(value = "/json", method = RequestMethod.GET)
public @ResponseBody TestBean testAjax(
        HttpServletRequest req,
        @RequestParam(value = "type", required = false) String type,
        @RequestParam("track") String track) {
    return new TestBean();
}

，然后/json?type=abc&track=aa或/json?track=rr将起作用

推荐答案

您不能具有可选的路径变量，但是可以有两个调用相同服务代码的控制器方法:

You can't have optional path variables, but you can have two controller methods which call the same service code:

@RequestMapping(value = "/json/{type}", method = RequestMethod.GET)
public @ResponseBody TestBean typedTestBean(
        HttpServletRequest req,
        @PathVariable String type,
        @RequestParam("track") String track) {
    return getTestBean(type);
}

@RequestMapping(value = "/json", method = RequestMethod.GET)
public @ResponseBody TestBean testBean(
        HttpServletRequest req,
        @RequestParam("track") String track) {
    return getTestBean();
}

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