发布 REST 风格的服务

curl \
    --header "Content-Type: application/json" \
    --data '["Dubbo"]' \
    http://localhost:50052/org.apache.dubbo.samples.api.GreetingsService/sayHi/

# 获取示例代码
git clone --depth=1 https://github.com/apache/dubbo-samples.git
cd dubbo-samples/2-advanced/dubbo-samples-triple-rest/dubbo-samples-triple-rest-basic
# 直接运行
mvn spring-boot:run
# 或打包后运行
mvn clean package -DskipTests
java -jar target/dubbo-samples-triple-rest-basic-1.0.0-SNAPSHOT.jar

// 服务接口
package org.apache.dubbo.rest.demo;

import org.apache.dubbo.remoting.http12.rest.Mapping;
import org.apache.dubbo.remoting.http12.rest.Param;

public interface DemoService {
    String hello(String name);

    @Mapping(path = "/hi", method = HttpMethods.POST)
    String hello(User user, @Param(value = "c", type = ParamType.Header) int count);
}

// 服务实现
@DubboService
public class DemoServiceImpl implements DemoService {
    @Override
    public String hello(String name) {
        return "Hello " + name;
    }

    @Override
    public String hello(User user, int count) {
        return "Hello " + user.getTitle() + ". " + user.getName() + ", " + count;
    }
}

// 模型
@Data
public class User {
    private String title;
    private String name;
}

curl -v "http://127.0.0.1:8081/org.apache.dubbo.rest.demo.DemoService/hello?name=world"
# 输出如下
#> GET /org.apache.dubbo.rest.demo.DemoService/hello?name=world HTTP/1.1
#> Host: 127.0.0.1:8081
#> User-Agent: curl/8.7.1
#> Accept: */*
#>
#* Request completely sent off
#< HTTP/1.1 200 OK
#< content-type: application/json
#< alt-svc: h2=":8081"
#< content-length: 13
#<
#"Hello world"

curl -v -H "c: 3" -d 'name=Yang' "http://127.0.0.1:8081/org.apache.dubbo.rest.demo.DemoService/hi.txt?title=Mr"
# 输出如下
#> POST /org.apache.dubbo.rest.demo.DemoService/hi.txt?title=Mr HTTP/1.1
#> Host: 127.0.0.1:8081
#> User-Agent: curl/8.7.1
#> Accept: */*
#> c: 3
#> Content-Length: 9
#> Content-Type: application/x-www-form-urlencoded
#>
#* upload completely sent off: 9 bytes
#< HTTP/1.1 200 OK
#< content-type: text/plain
#< alt-svc: h2=":8081"
#< content-length: 17
#<
#Hello Mr. Yang, 3

logging:
  level:
    "org.apache.dubbo.rpc.protocol.tri": debug
    "org.apache.dubbo.remoting": debug

# 注册mapping
DEBUG o.a.d.r.p.t.TripleProtocol               :  [DUBBO] Register triple grpc mapping: 'org.apache.dubbo.rest.demo.DemoService' -> invoker[tri://192.168.2.216:8081/org.apache.dubbo.rest.demo.DemoService]
 INFO .r.p.t.r.m.DefaultRequestMappingRegistry :  [DUBBO] BasicRequestMappingResolver resolving rest mappings for ServiceMeta{interface=org.apache.dubbo.rest.demo.DemoService, service=DemoServiceImpl@2a8f6e6} at url [tri://192.168.2.216:8081/org.apache.dubbo.rest.demo.DemoService]
DEBUG .r.p.t.r.m.DefaultRequestMappingRegistry :  [DUBBO] Register rest mapping: '/org.apache.dubbo.rest.demo.DemoService/hi' -> mapping=RequestMapping{name='DemoServiceImpl#hello', path=PathCondition{paths=[org.apache.dubbo.rest.demo.DemoService/hi]}, methods=MethodsCondition{methods=[POST]}}, method=MethodMeta{method=org.apache.dubbo.rest.demo.DemoService.hello(User, int), service=DemoServiceImpl@2a8f6e6}
DEBUG .r.p.t.r.m.DefaultRequestMappingRegistry :  [DUBBO] Register rest mapping: '/org.apache.dubbo.rest.demo.DemoService/hello' -> mapping=RequestMapping{name='DemoServiceImpl#hello~S', path=PathCondition{paths=[org.apache.dubbo.rest.demo.DemoService/hello]}}, method=MethodMeta{method=org.apache.dubbo.rest.demo.DemoService.hello(String), service=DemoServiceImpl@2a8f6e6}
 INFO .r.p.t.r.m.DefaultRequestMappingRegistry :  [DUBBO] Registered 2 REST mappings for service [DemoServiceImpl@44627686] at url [tri://192.168.2.216:8081/org.apache.dubbo.rest.demo.DemoService] in 11ms

# 请求响应
DEBUG .a.d.r.p.t.r.m.RestRequestHandlerMapping :  [DUBBO] Received http request: DefaultHttpRequest{method='POST', uri='/org.apache.dubbo.rest.demo.DemoService/hi.txt?title=Mr', contentType='application/x-www-form-urlencoded'}
DEBUG .r.p.t.r.m.DefaultRequestMappingRegistry :  [DUBBO] Matched rest mapping=RequestMapping{name='DemoServiceImpl#hello', path=PathCondition{paths=[/org.apache.dubbo.rest.demo.DemoService/hi]}, methods=MethodsCondition{methods=[POST]}}, method=MethodMeta{method=org.apache.dubbo.rest.demo.DemoService.hello(User, int), service=DemoServiceImpl@2a8f6e6}
DEBUG .a.d.r.p.t.r.m.RestRequestHandlerMapping :  [DUBBO] Content-type negotiate result: request='application/x-www-form-urlencoded', response='text/plain'
DEBUG .d.r.h.AbstractServerHttpChannelObserver :  [DUBBO] Http response body is: '"Hello Mr. Yang, 3"'
DEBUG .d.r.h.AbstractServerHttpChannelObserver :  [DUBBO] Http response headers sent: {:status=[200], content-type=[text/plain], alt-svc=[h2=":8081"], content-length=[17]}