feign 如何調用 service 且傳入參數

比較常見就是這兩種
@GetMapping
@PostMapping
這兩種又有
@RequestMappin
此文章沒討論用這個**@RequestMappin** 這算是比較舊的寫法，或許後續有空會補上

通常我們呼叫 restAPi可以用
@GetMapping
@PostMapping
那麼又有分

  • 無參數
  • 單參數
  • 多個參數
  • 複雜對象
    在前面幾章都是示範無參數這邊不多做介紹我們直接針對如何傳
  • 單參數
  • 多個參數
  • 複雜對象
    做討論

單參數

就掉用來講我們把

Provider Controller

@SpringBootApplication
@EnableEurekaClient
@RestController
public class EurekaServiceProviderApplication {
	
	@Value("${server.port}")
	    String port;
	 @GetMapping("/")
	public String home(@RequestParam (value="id", required = false) Integer employeeId) {
	      return "Hello world" + port+ employeeId;
	}
	public static void main(String[] args) {
		SpringApplication.run(EurekaServiceProviderApplication.class, args);
	}

}

Consumer 接口

@FeignClient("eureka-provider")
public interface HomeClient {
	 @GetMapping("/")
	 public String home(@RequestParam (value="id", required = false) Integer employeeId) ;
}

Consumer Controller

@RestController
public class ConsumerController {
		@Autowired
	    private HomeClient homeClient;

	
		 @GetMapping("/hello/{id}")
	    public String hello(@PathVariable(name="id") Integer employeeId) {
	    	System.out.print(employeeId);
	        return homeClient.home(employeeId);
	    }
}

多參數

Provider Controller

@SpringBootApplication
@EnableEurekaClient
@RestController
public class EurekaServiceProviderApplication {
	
	@Value("${server.port}")
	    String port;
	 @GetMapping("/")
	 public String home(@RequestParam (value="id", required = false) Integer employeeId,@RequestParam (value="id2", required = false) Integer employeeId2)  {
	      return "Hello world" + port+ employeeId+employeeId2;
	}
	public static void main(String[] args) {
		SpringApplication.run(EurekaServiceProviderApplication.class, args);
	}

}

Consumer 接口

@FeignClient("eureka-provider")
public interface HomeClient {
	 @GetMapping("/")
	 public String home(@RequestParam (value="id", required = false) Integer employeeId,@RequestParam (value="id2", required = false) Integer employeeId2) ;
}

Consumer Controller

@RestController
public class ConsumerController {
		@Autowired
	    private HomeClient homeClient;

	
		 @GetMapping("/hello/{id}/{id2}")
	    public String hello(@PathVariable(name="id") Integer employeeId,@PathVariable(name="id2") Integer employeeId2) {
	    	System.out.print(employeeId2);
	        return homeClient.home(employeeId,employeeId2);
	    }
}

詳細可以參考
SpringBoot 中常用注解@PathVaribale/@RequestParam/@GetMapping介绍

http://www.itmuch.com/spring-cloud-sum/feign-multiple-params/

複雜對象

構建一個 entity
UserEntity.class
這邊好像在一個網站有看過這邊大小寫 windows 沒有限制，在linux 就嚴格 限制 大小寫，後面會來好好講解，
然後這個 Entity 同時在 Provider 和 Consumer 裡。

public class UserEntity {
	
	private Integer id;

	private String Name ;

	private Integer age;
	
	public Integer getId() {
		return id;
	}
	public void setId(Integer id) {
		this.id = id;
	}
	public String getName() {
		return Name;
	}
	public void setName(String name) {
		Name = name;
	}
	public Integer getAge() {
		return age;
	}
	public void setAge(Integer age) {
		this.age = age;
	}
}

Provider


public class UserEntity {
	
	private Integer id;

	private String Name ;

	private Integer age;
	
	public Integer getId() {
		return id;
	}
	public void setId(Integer id) {
		this.id = id;
	}
	public String getName() {
		return Name;
	}
	public void setName(String name) {
		Name = name;
	}
	public Integer getAge() {
		return age;
	}
	public void setAge(Integer age) {
		this.age = age;
	}
}

Consumer 接口

@FeignClient("eureka-provider")
public interface HomeClient {
	 @GetMapping("/")
	 public String home(@RequestParam (value="id", required = false) Integer employeeId,@RequestParam (value="id2", required = false) Integer employeeId2) ;
	 @PostMapping("/user")
	 public String aveUser(@RequestBody UserEntity user);
}

Consumer Controller

@RestController
public class ConsumerController {
		@Autowired
	    private HomeClient homeClient;

	
		 @GetMapping("/hello/{id}/{id2}")
	    public String hello(@PathVariable(name="id") Integer employeeId,@PathVariable(name="id2") Integer employeeId2) {
	    	System.out.print(employeeId2);
	        return homeClient.home(employeeId,employeeId2);
	    }
		 
		@PostMapping("/user")
			public String aveUser(@RequestBody UserEntity user) {
				return homeClient.aveUser(user);
		}

}

運行並測試

注意大小寫


  • Eureka + Consumer (Rest+Ribbon)
  • Eureka + Consumer Feign

大概變化就這幾種
接下來就輪到介紹我們的 Hystrix 斷路器。

Select a repo