SpringCloud（4） 声明试服务调用Feign

利用fegin去调用服务：

先修改两个HELLO-SERVER服务中添加

@GetMapping("/hello1")
public String hello(@RequestParam String name){
    return "Hello" + name;
}

@GetMapping("/hello2")
public User hello(@RequestHeader String name, @RequestHeader Integer age){
    return new User(name,age);
}

@PostMapping("/hello3")
public String hello(@RequestBody User user){
    return "hello"+user.getName()+","+user.getAge();
}
User实体类

public class User implements Serializable{

    private static final long serialVersionUID = 2066603420531796503L;

    private String name;
    private Integer age;

    public User() {
    }

    public User(String name, Integer 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;
    }
}

首先引入pom依赖

<dependency>
   <groupId>org.springframework.cloud</groupId>
   <artifactId>spring-cloud-starter-eureka</artifactId>
</dependency>

<dependency>
   <groupId>org.springframework.cloud</groupId>
   <artifactId>spring-cloud-starter-feign</artifactId>
</dependency>
然后在application中加上如下注解：

@EnableDiscoveryClient
@EnableFeignClients

application.properties配置文件

server.port=9001
spring.application.name=feign-consumer
eureka.client.service-url.defaultZone=http://localhost:8877/eureka/,http://localhost:8898/eureka/

编写feign客户端

@FeignClient("hello-server")
public interface FeignService {

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

    @GetMapping("/hello1")
    String hello(@RequestParam("name") String name);

    @GetMapping("/hello2")
    User hello(@RequestHeader("name") String name, @RequestHeader("age") Integer age);

    @PostMapping("/hello3")
    String hello(@RequestBody User user);

}

控制层调用demo

@RestController
public class FeignController {

    @Resource
    private FeignService feignService;

    @RequestMapping("/feign")
    public String feign(){
        return feignService.hello();
    }

    @RequestMapping("/feign2")
    public String feign2(){
        String str1 = feignService.hello("goblin");
        String str2 = feignService.hello("goblin",22).toString();
        String str3 = feignService.hello(new User("goblin", 22));
        return str1 + " "+ str2 +" " + str3 ;
    }

}

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