python做网站性能怎么样,龙岩网站建设方案,搜索优化公司,wordpress上好用的编辑器Feign是从Netflix中分离出来的轻量级项目#xff0c;能够在类接口上添加注释#xff0c;成为一个REST API 客户端#xff0c;Feign默认集成了Ribbon。 Feign中对 Hystrix 有依赖关系。Feign只是一个便利的rest框架#xff0c;简化调用#xff0c;最后还是通过ribbon在注册… Feign是从Netflix中分离出来的轻量级项目能够在类接口上添加注释成为一个REST API 客户端Feign默认集成了Ribbon。 Feign中对 Hystrix 有依赖关系。Feign只是一个便利的rest框架简化调用最后还是通过ribbon在注册服务器中找到服务实例然后对请求进行分配 Feign是一种声明式、模板化的HTTP客户端。在Spring Cloud中使用Feign, 我们可以做到使用HTTP请求远程服务时能与调用本地方法一样的编码体验开发者完全感知不到这是远程方法更感知不到这是个HTTP请求。 一、使用方式 1、首先写好需要注册进注册中心的服务接口UserServiceController该接口相当于service层只是以RestFULL接口的形式供远程调用 RestController
RequestMapping(userService)
public class UserServiceController {GetMapping(getUser/{userId})public User getUser(PathVariable(userId) String userId){System.out.println(获取User,更具UserId查询User-- userId);User user new User();user.setUserName(Tom);user.setPassword(123);return user;}PostMapping(saveUser)public String saveUser(RequestBody User user){System.out.println(保存User--- JSON.toJSONString(user));return userId:010100100101;}GetMapping(deleteUser/{userId})public Boolean deleteUser(PathVariable(userId) String userId){System.out.println(删除用户--- userId);return true;}RequestMapping(value findUserByUserNameAndPassword)public User findUserByUserNameAndPassword(String userName, String password){System.out.println(userService--- userName password--- password);User user new User();user.setUserName(Tomcat);user.setPassword(123);return user;} 2、在请求远程服务的项目的POM.XML文件中引入对Feign依赖 dependencygroupIdorg.springframework.cloud/groupIdartifactIdspring-cloud-starter-feign/artifactId
/dependency 3、创建FeignClient FeignClient(valuespringcloud-userservcie)
public interface UserClient {RequestMapping(value userService/getUser/{userId}, method RequestMethod.GET)public User getUser(PathVariable(userId) String userId);RequestMapping(value userService/saveUser, method RequestMethod.POST)public String saveUser(User user);RequestMapping(value userService/deleteUser/{userId}, method RequestMethod.GET)public Boolean deleteUser(PathVariable(userId) String userId);RequestMapping(value userService/findUserByUserNameAndPassword, method RequestMethod.GET)public User findUserByUserNameAndPassword(RequestParam(userName) String userName, RequestParam(password) String password); } FeignClient(valuespringcloud-userservcie)用于通知Feign组件对该接口进行代理(不需要编写接口实现)value属性指定我们要调用注册中心的服务ID。使用者可直接通过Autowired注入。RequestMapping表示在调用该方法时需要向/group/{groupId}发送请求。PathVariable与SpringMVC中对应注解含义相同。原理Spring Cloud应用在启动时Feign会扫描标有FeignClient注解的接口生成代理并注册到Spring容器中。生成代理时Feign会为每个接口方法创建一个RequetTemplate对象该对象封装了HTTP请求需要的全部信息请求参数名、请求方法等信息都是在这个过程中确定的Feign的模板化就体现在这里 4、在Controller调用 RestController
RequestMapping(userClient)
public class UserController {Autowiredprivate UserClient userClient;RequestMapping(value getUser/{userId}, method RequestMethod.GET)public User getUser(PathVariable(userId) String userId){return userClient.getUser(userId);}RequestMapping(value saveUser, method RequestMethod.POST)public String saveUser(User user){return userClient.saveUser(user);}RequestMapping(value deleteUser/{userId}, method RequestMethod.GET)public Boolean deleteUser(PathVariable(userId) String userId){return userClient.deleteUser(userId);}RequestMapping(value findUserByUserNameAndPassword)public User findUserByUserNameAndPassword(String userName, String password){System.out.println(userClient--- userName password--- password);return userClient.findUserByUserNameAndPassword(userName, password);}} 5、启动类上添加Feign注解EnableFeignClients Configuration
ComponentScan
EnableAutoConfiguration
EnableEurekaClient
EnableFeignClients
public class Application {public static void main(String[] args) {SpringApplication.run(Application.class, args);}
} 转载于:https://www.cnblogs.com/JoeyWong/p/9458998.html
