Spring boot 内部服务调用 （FeignClient）

Eureka 注册的服务之间互相调用

1.请求方

启动类添加注解,扫描Eureka 中的全部服务

1. @SpringBootApplication
2. @EnableEurekaClient
3. @EnableFeignClients
4. public class LoginServiceApplication {
6. public static void main(String[] args) {
7. new SpringApplicationBuilder(LoginServiceApplication.class).web(true).run(args);
8. }
10. }

pom.xml 添加包 (版本号 根据实际选择)

1. <dependency>
2. <groupId>org.springframework.cloud</groupId>
3. <artifactId>spring-cloud-starter-feign</artifactId>
4. <version>1.4.6.RELEASE</version>
5. </dependency>

创建接口类

1. @FeignClient(name="hello-service") //spring service name
2. public interface FeignVehicle {
4. @RequestMapping(value="/hello", method = RequestMethod.GET)
5. @ResponseBody
6. public List<Map> hello(@RequestParam Map<String,String> params);
7. }

实现类注入此接口类

1. @Autowired
2. FeignVehicle feignVehicle;

使用的时候直接按照正常调用方式即可

1. Map<String,String> map = new HashMap<String, String>();
2. feignVehicle.hello(map);

跨服务调用的时候出现token信息取不到,在发送方添加拦截器

1. @Configuration
2. public class FeignConfiguration {
4. @Bean
5. public RequestInterceptor requestInterceptor() {
6. return new RequestInterceptor() {
7. @Override
8. public void apply(RequestTemplate template) {
10. ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder
11. .getRequestAttributes();
12. HttpServletRequest request = attributes.getRequest(); //当前服务token
14. template.header("Authorization","Bearer " + request.getSession().getId()); //template 接收请求方token
15. }
17. };
18. }
19. }

2.接收方

请求 启动类

1. @SpringBootApplication
2. @EnableEurekaClient
3. public class HelloServiceApplication {
5. public static void main(String[] args) {
6. new SpringApplicationBuilder(HelloServiceApplication.class).web(true).run(args);
7. }
9. }

 请求Controller

1. @Controller
2. @RequestMapping("/hello")
3. public class HelloController {
5. @RequestMapping(value="/hello",method = RequestMethod.GET)
6. @ResponseBody
7. public List<Map> hello(@RequestParam Map<String, String> queryParam) {
8. return null;
9. }
10. }

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