为什么“@PathVariable”无法在SpringBoot中的接口上工作
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); }
简单的控制器 – 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 starter-parent运行它。 用GET / vendor / foobar命中它，你会看到：Hello null
Spring认为’vendorName’是一个查询参数！
如果使用未实现接口的版本替换控制器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。
这是一个function吗？ 还是个bug？
您刚刚错过了@PathVariable中的@PathVariable
@Override public String getContact(@PathVariable String vendorName) { System.out.println("Got: " + vendorName); return "Hello " + vendorName; }