HelloWorld.java

package org.example;

import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;

@Path("/")
public class HelloWorld {

    // curl http://localhost:8080/helloworld-rs-1.0.0/json
    @GET
    @Path("/json")
    @Produces({ "application/json" })
    public String getHelloWorldJSON() {
        return "{\"result\":\"Hello World!\"}";
    }

    // curl http://localhost:8080/helloworld-rs-1.0.0/xml
    @GET
    @Path("/xml")
    @Produces({ "application/xml" })
    public String getHelloWorldXML() {
        return "<xml><result>Hello World!</result></xml>";
    }

    // curl -X POST -d "ああああ" http://localhost:8080/helloworld-rs-1.0.0/echo
    @POST
    @Path("/echo")
    @Produces({ "application/xml" })
    public String echo( String payload ) {
        System.out.println( "payload : " + payload );
        return "<xml><result>" + payload + "</result></xml>";
    }
}