[Spring Cloud] Open Feign---扩展

原创已于 2022-11-21 18:09:33 修改 · 551 阅读

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于 2022-11-20 12:02:15 首次发布

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衔接上篇: [Spring Cloud] Open Feign 使用_沫洺的博客-优快云博客

🌹Open Feign扩展

创建子模块user-api

pom.xml引入最小的依赖

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.moming</groupId>
        <artifactId>spring-cloud-root</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <relativePath>../pom.xml</relativePath>
    </parent>

    <artifactId>user-api</artifactId>

    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
        </dependency>
    </dependencies>

</project>

父类pom中指定模块

<module>user-api</module>

整理模块结构,改删的删

定义接口

public interface IUserService {
    //通过用户Id返回用户名称   /user/name?id=12
    @GetMapping("/user/name")
    String getName(@RequestParam Integer id);

    //通过用户Id返回用户金额  /user/amount?id=12
    @GetMapping("/user/amount")
    Integer getAmount(@RequestParam Integer id);
}

接下来模拟个场景,子模块a要去调用api中的接口

a模块导入api依赖坐标

        <dependency>
            <groupId>com.moming</groupId>
            <artifactId>user-api</artifactId>
            <version>0.0.1-SNAPSHOT</version>
            <scope>compile</scope>
        </dependency>

创建实现类去实现IUserService,模拟返回指定数据

@RestController
public class UserServiceImpl implements IUserService {
    @Override
    public String getName(Integer id) {
        return "张"+id;
    }

    @Override
    public Integer getAmount(Integer id) {
        return id*100;
    }
}

启动a模块,测试接口

然后b模块去调用a服务时,就可以在AServiceClient中去实现IUserService

@FeignClient("a")
public interface AServiceClient extends IUserService {

    //@GetMapping("/a/test")
    //String test(@RequestParam(value = "name",required = false) String name);
    //
    //@GetMapping("/a/age/{age}")
    //String age(@PathVariable Integer age);
}

Debug测试

@RestController
public class B {
    @Autowired
    private AServiceClient aServiceClient;

    @GetMapping("use-openfeign")
    public String callAServer(@RequestParam(value = "nickName",required = false) String nickName){
        //String value = aServiceClient.test(nickName);
        //String value2 = aServiceClient.age(18);
        String value = aServiceClient.getName(3);
        return value;
    }

    //@Autowired
    //private RestTemplate restTemplate;
    //@GetMapping("/b/test")
    //public String test(@RequestParam(value = "nickName",required = false) String nickName){
    //    //希望访问到A的应用
    //    String ret = restTemplate.getForObject("http://a/a/test?name=张三", String.class);
    //    return ret+"的小名: "+nickName;
    //}
}