Feign的参数绑定实战

一 hello-service的相关处理

1 控制器增加相应处理

package com.didispace.web;

import com.didispace.dto.User;
import com.didispace.service.HelloService;
import org.springframework.web.bind.annotation.*;

@RestController
public class RefactorHelloController implements HelloService {

    @Override
    public String hello(@RequestParam("name") String name) {
        return "Hello " + name;
    }

    @Override
    public User hello(@RequestHeader("name") String name, @RequestHeader("age") Integer age) {
        return new User(name, age);
    }

    @Override
    public String hello(@RequestBody User user) {
        return "Hello "+ user.getName() + ", " + user.getAge();
    }

}

2 User对象的定义

package com.didispace.web;


public class User {

    private String name;
    private Integer age;

    //这里必须要有默认构造函数，不然，Spring Cloud Feign根据JSON字符串转换User对象时会抛出异常
    public User() {
    }

    public User(String name, Integer age) {
        this.name = name;
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "name=" + name + ", age=" +age;
    }

}

二 feign-consumer处理

1 在feign-consumer中创建和hello-service一样的User对象

2 在HelloService接口的处理

package com.didispace.web;

import org.springframework.cloud.netflix.feign.FeignClient;
import org.springframework.web.bind.annotation.*;

@FeignClient(name="HELLO-SERVICE", fallback = HelloServiceFallback.class)
public interface HelloService {

    @RequestMapping("/hello")
    String hello();

    //这里的value不能少
    @RequestMapping(value = "/hello1", method = RequestMethod.GET)
    String hello(@RequestParam("name") String name) ;
    //这里的value不能少
    @RequestMapping(value = "/hello2", method = RequestMethod.GET)
    User hello(@RequestHeader("name") String name, @RequestHeader("age") Integer age);
    //这里的value不能少
    @RequestMapping(value = "/hello3", method = RequestMethod.POST)
    String hello(@RequestBody User user);

}

3 控制器中新增接口

package com.didispace.web;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class ConsumerController {

    @Autowired
    HelloService helloService;
    @Autowired
    RefactorHelloService refactorHelloService;

    @RequestMapping(value = "/feign-consumer", method = RequestMethod.GET)
    public String helloConsumer() {
        return helloService.hello();
    }

    @RequestMapping(value = "/feign-consumer2", method = RequestMethod.GET)
    public String helloConsumer2() {
        StringBuilder sb = new StringBuilder();
        sb.append(helloService.hello()).append("\n");
        sb.append(helloService.hello("DIDI")).append("\n");
        sb.append(helloService.hello("DIDI", 30)).append("\n");
        sb.append(helloService.hello(new User("DIDI", 30))).append("\n");
        return sb.toString();
    }
}

三测试

1 启动Eureka、hello-service、feign-consumer。

2 访问http://localhost:9001/feign-consumers2

Hello World

Hello DIDI

name=DIDI, age=30

Hello DIDI, 30

Feign的参数绑定实战

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