如何使用ID(arguments)来区分不同的GetMappings。

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英文:

How can I use ID(arguments) to different GetMappings

问题

当我尝试访问 localhost:8080/api/employees 时我会得到一个员工列表以JSON格式)。我还希望能够通过ID获取单个员工的信息当我尝试访问 localhost:8080/api/123abc 时无法找到具有该ID的员工我的响应是

> Whitelabel Error Page
> 此应用程序未显式映射 /error因此您看到了这个回退页面
> 
> Tue Jul 28 08:50:28 CEST 2020 发生了意外错误类型=Not Found状态=404)。

以下是我的代码

@RestController
@RequestMapping(value = "/api", produces = MediaType.APPLICATION_JSON_VALUE)
public class TestApiController {
    @Autowired
    private EmployeePoller poller;

    @GetMapping(path = "/employees")
    public List<Employee> allEmployees() {
        return poller.getAllEmployees();
    }

    @GetMapping(path = "/{id}")
    public Employee singleEmployee(@PathVariable String id) {
        return poller.getEmployeeById(id);
    }

    // 编辑:`@PathVariable Long id` 和 `poller.getEmployeeById(id.toString());` 也无效。
}
英文:

When I try localhost:8080/api/employees I get a list (JSON-format). I would also like to get a single employee by ID. When I try localhost:8080/api/123abc I cannot find the employee with that ID. My response is:

> Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.
>
> Tue Jul 28 08:50:28 CEST 2020 There was an unexpected error (type=Not
> Found, status=404).

My code is below here

@RestController
@RequestMapping(value = &quot;/api&quot;, produces = MediaType.APPLICATION_JSON_VALUE)
public class TestApiController {
    @Autowired
    private EmployeePoller poller;

    @GetMapping(path = &quot;/employees&quot;)
    public List&lt;Employee&gt; allEmployees() {
        return poller.getAllEmployees();
    }

    @GetMapping(path = &quot;/{id}&quot;)
    public Employee singleEmployee(@PathVariable String id) {
        return poller.getEmployeeById(id);
    }

edit: @PathVariable Long id and poller.getEmployeeById(id.toString()); doesn't work either.

答案1

得分: 1

404 - 未找到 可能是:

  1. GET /api/123abc 在您的控制器中未声明为端点。
  2. 没有 id = 123abc 的员工。

要确认您的情况,请使用方法 OPTION 对 localhost:8080/api/123abc 进行新的请求。

如果响应是 404,则问题在于您的控制器。如果响应是 200,则没有 id 为 123abc 的员工。

此外,我看到您在两个端点上都使用了相同的路径。请尝试以下代码(它验证“id”变量是否为 employees)。

@GetMapping(path = "/{id}")
public Employee getEmployee(@PathVariable(name = "id") String id) {
    if ("employees".equals(id)) {
        return poller.getAllEmployees();
    } else {
        return poller.getEmployeeById(id);
    }
}
英文:

The 404 - Not found could be:

  1. GET /api/123abc isn't declared as endpoint in your controller.
  2. There isn't employee with id = 123abc.

To confirm what's your case, do a new request with method OPTION to localhost:8080/api/123abc

If the response is 404, the issue is in your controller. If response is 200, then there isn't employee with id 123abc.

Also I see you are using the same path for both endpoints. Try the following code (It validate if "id" variable is employees).

@GetMapping(path = &quot;/{id}&quot;)
public Employee getEmployee(@PathVariable(name = &quot;id&quot;) String id) {
    if (&quot;employees&quot;.equals(id)) {
        return poller.getAllEmployees();
    } else {
        return poller.getEmployeeById(id);
    }
}

huangapple
  • 本文由 发表于 2020年7月28日 14:58:38
  • 转载请务必保留本文链接:https://go.coder-hub.com/63128610.html
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