简单的应用程序-Application.java

package hello;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Application {

public static void main(String[] args) {
    SpringApplication.run(Application.class, args);
  }
}

简单的界面-ThingApi.java

package hello;

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

public interface ThingApi {

  // get a vendor
  @RequestMapping(value = "/vendor/{vendorName}", method = RequestMethod.GET)
  String getContact(@PathVariable String vendorName);

}

简单控制器-ThingController.java

package hello;

import org.springframework.web.bind.annotation.RestController;

@RestController
public class ThingController implements ThingApi {

  @Override
  public String getContact(String vendorName) {
    System.out.println("Got: " + vendorName);

    return "Hello " + vendorName;
  }
}

使用您最喜欢的SpringBoot入门级父级来运行此程序。用GET / vendor / foobar选中它，您将看到：Hello null

Spring认为’vendorName’是一个查询参数！

如果将控制器替换为未实现接口的版本，并将注释移入其中，如下所示：

package hello;

import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class ThingController {

  @RequestMapping(value = "/vendor/{vendorName}", method = RequestMethod.GET)
  public String getContact(@PathVariable String vendorName) {
    System.out.println("Got: " + vendorName);

      return "Hello " + vendorName;
  }
}

工作正常。

这是功能吗？还是错误？