java - Spring MVC @PathVariable 被视为 @RequestParam

Question

这个问题已经有答案了:

Spring MVC Annotated Controller Interface with @PathVariable (5 个回答)

已关闭 6 年前。

我有一个 spring mvc API(XML 配置)，内部有多个服务。但是当我尝试添加 @RequestMapping 的服务时包含路径变量/{theCurrencyCode} ，创建的资源不是我所期望的。

我的期望:

http://localhost:8080/api/v3/parameters/currencies/EUR

什么有效:

http://localhost:8080/api/v3/parameters/currencies/{theCurrencyCode}?theCurrencyCode=EUR

这是我的映射:

import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import java.util.List;

import static org.springframework.http.MediaType.APPLICATION_JSON_VALUE;

@RequestMapping(value = "v3/", produces = { APPLICATION_JSON_VALUE })
public interface ParametersApi {

  @RequestMapping(
      value = "/parameters/currencies/{theCurrencyCode}",
      produces = { "application/json" },
      method = RequestMethod.GET)
  ResponseEntity<List<Currency>> GetCurrencies(@PathVariable("theCurrencyCode") String theCurrencyCode);

}

实现:

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;

import java.util.ArrayList;
import java.util.List;

@Controller
public class ParametersApiController implements ParametersApi{

  private final CurrenciesService service;

  @Autowired
  public ParametersApiController(CurrenciesService service) {
    this.service = service;
  }

  @Override
  public ResponseEntity<List<Currency>> GetCurrencies(String code) {

    final List<Currency> currencies = service.getCurrencies(code);

    return new ResponseEntity<>(currencies, HttpStatus.OK);
  }
}

Swagger UI 证实了这一点，看到 theCurrencyCode作为“参数类型”query而不是path .

如何让我的 @PathVariable 工作？

Answer 1

您的方法实现中缺少 Pathvariable。因此，要修复，您需要编写如下内容:

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;

import java.util.ArrayList;
import java.util.List;

@Controller
public class ParametersApiController implements ParametersApi{

    private final CurrenciesService service;

    @Autowired
    public ParametersApiController(CurrenciesService service) {
        this.service = service;
    }

    @Override
    public ResponseEntity<List<Currency>> GetCurrencies(@PathVariable String theCurrencyCode) {
        final List<Currency> currencies = service.getCurrencies(theCurrencyCode);
        return new ResponseEntity<>(currencies, HttpStatus.OK);
    }
}