如何解决spring控制器中请求映射“不明确”的情况？

Question

我编写了一个 spring 控制器，其中我只想对所有方法使用单个 URL。 即使我使用不同的方法签名int、string、object我也收到错误。

@RequestMapping(value="problemAPI/ticket", method = RequestMethod.GET )
public @ResponseBody String getTicketData(@RequestParam("customerId") int customerId) {
    return "customer Id: "+customerId+" has active Ticket:1010101";
}

@RequestMapping(value="problemAPI/ticket", method = RequestMethod.GET )
public @ResponseBody String getTicketStatusByCustname(@RequestParam("customerName") String customerName) {  
    return "Mr." + customerName + " Your Ticket is Work in Progress";
}

@RequestMapping(value="problemAPI/ticket", method = RequestMethod.POST )
public @ResponseBody String saveTicket(@RequestBody TicketBean bean) {
    return "Mr." + bean.getCustomerName() + " Ticket" +  bean.getTicketNo() + " has been submitted successfuly";
}

错误：

java.lang.IllegalStateException: Ambiguous mapping found. Cannot map 'problemTicketController' bean method 
public String com.nm.controller.webservice.ticket.problem.ProblemTicketController.getTicketData(int)
to {[/problemAPI/ticket],methods=[GET],params=[],headers=[],consumes=[],produces=[],custom=[]}: There is already 'problemTicketController' bean method
public java.lang.String com.nm.controller.webservice.ticket.problem.ProblemTicketController.getTicketByCustname(int) mapped.

Answer 1

您可以通过使用params注释属性显式指定查询参数来实现此目的：

@RequestMapping(
    value  = "problemAPI/ticket",
    params = "customerId",
    method = RequestMethod.GET
)
public @ResponseBody String getTicketData(@RequestParam("customerId") int customerId){
    return "customer Id: " + customerId + " has active Ticket:1010101";
}

@RequestMapping(
    value  = "problemAPI/ticket",
    params = "customerName",
    method = RequestMethod.GET
)
public @ResponseBody String getTicketStatusByCustname(@RequestParam("customerName") String customerName){
    return "Mr." + customerName + " Your Ticket is Work in Progress";
}

为了使它更干净，您可以使用别名注释，如@GetMapping和@PostMapping ：

@GetMapping(
    value  = "problemAPI/ticket",
    params = "customerName"
)
public @ResponseBody String getTicketStatusByCustname(@RequestParam("customerName") String customerName) {

}

@PostMapping(
    value = "problemAPI/ticket"
)
public @ResponseBody String saveTicket(@RequestBody TicketBean bean) {
    return "Mr." + bean.getCustomerName() + " Ticket" +  bean.getTicketNo() + " has been submitted successfuly";
}

Answer 2

https://stackoverflow.com/users/5091346/andrii-abramov提到的答案是正确的。 然而，RESTful 服务的 JSR-311 规范提到了以下内容：

此类方法称为子资源方法，被视为普通资源方法（参见第 3.3 节），除了该方法仅针对与通过将资源类的 URI 模板与 URI 模板连接而创建的 URI 模板匹配的请求 URI 调用的方法。

不过，使用 spring 框架我们可以实现这一点。