为什么“@PathVariable”无法在 Spring Boot 中的接口上工作 [重复]

Question

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);
  }
}

简单的接口 - 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;
  }
}

用你最喜欢的 SpringBoot starter-parent 运行它。 用 GET /vendor/foobar 点击它 你会看到： 你好空

Spring 认为 'vendorName' 是一个查询参数！

如果您将控制器替换为未实现接口的版本并将注释移动到其中，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;
  }
}

它工作正常。

那么这是一个功能吗？还是错误？

Answer 1

你只是在你的工具中错过了@PathVariable

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

    return "Hello " + vendorName;
  }