feign遇见的坑(5)

1.feign的坑

1.GET请求自动转换成POST

服务提供者接口

@GetMapping("/user")
public User getUser(User user){
    user.setId("old:" + user.getId());
    user.setAge(18);
    user.setName("default:" + user.getName());
    return user;
}

公共API

@FeignClient(value = "produce1-service", url = "localhost:9000", path = "/provider", decode404 = true)
public interface ConsumerApi {

    @GetMapping("/user")
    User getUser(User user);
}

消费者调用

@RestController
public class IndexController {

    @Autowired
    private ConsumerApi consumerApi;

    @RequestMapping("/user")
    User getAllUser(){
        User user = new User();
        user.setId("11");
        user.setName("mmkdier");
        user.setAge(2000);
        return consumerApi.getUser(user);
    }
}

1.异常信息

Resolved [org.springframework.web.HttpRequestMethodNotSupportedException: Request method 'POST' not supported]

2.原因

feign默认的远程调用使用的是jdk底层的HttpURLConnection

feign.Client类

HttpURLConnection类

3.解决方案

方法一

@FeignClient(value = "produce1-service", url = "localhost:9000", path = "/provider", decode404 = true)
public interface ConsumerApi {

    @GetMapping("/user")
    User getUser(@RequestParam String id, @RequestParam String name, @RequestParam String age);
}

方法二

@FeignClient(value = "produce1-service", url = "localhost:9000", path = "/provider", decode404 = true)
public interface ConsumerApi {

    @GetMapping("/user")
    User getUser(@RequestParam Map<String, Object> map);
}

方法三

feign本身对这个问题也有了解决方案,添加maven依赖,就会使用HttpUriRequest请求,其他的可以不变

        <dependency>
            <groupId>io.github.openfeign</groupId>
            <artifactId>feign-httpclient</artifactId>
        </dependency>

@FeignClient(value = "produce1-service", url = "localhost:9000", path = "/provider", decode404 = true)
public interface ConsumerApi {

    @GetMapping("/user")
    User getUser(User user);
}