在Spring 3.0中，我可以有一個可選的path變量嗎？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();}在這里我想/json/abc還是/json要調用相同的方法。一種明顯的解決方法是聲明type為請求參數：@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將工作
3 回答
HUWWW
TA貢獻1874條經驗 獲得超12個贊
您不能具有可選的路徑變量，但是可以有兩個調用相同服務代碼的控制器方法：
@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();
}
白板的微信
TA貢獻1883條經驗 獲得超3個贊
如果您在使用Spring 4.1和Java 8，你可以使用java.util.Optional它支持@RequestParam，@PathVariable，@RequestHeader和@MatrixVariableSpring MVC中-
@RequestMapping(value = {"/json/{type}", "/json" }, method = RequestMethod.GET)
public @ResponseBody TestBean typedTestBean(
@PathVariable Optional<String> type,
@RequestParam("track") String track) {
if (type.isPresent()) {
//type.get() will return type value
//corresponds to path "/json/{type}"
} else {
//corresponds to path "/json"
}
}
FFIVE
TA貢獻1797條經驗 獲得超6個贊
眾所周知，您還可以使用@PathVariable批注注入路徑變量的Map。我不確定該功能是否在Spring 3.0中可用或是否在以后添加，但是這是解決示例的另一種方法：
@RequestMapping(value={ "/json/{type}", "/json" }, method=RequestMethod.GET)
public @ResponseBody TestBean typedTestBean(
@PathVariable Map<String, String> pathVariables,
@RequestParam("track") String track) {
if (pathVariables.containsKey("type")) {
return new TestBean(pathVariables.get("type"));
} else {
return new TestBean();
}
}
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