java restful web服务说明

Question

I am completely new to Java web services. I have written following code:

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class Main {

  public static void main(String[] args) {
    try {
      URL url = new URL("www.somehost.com/somedata");
      HttpURLConnection conn = (HttpURLConnection) url.openConnection();
      conn.setRequestMethod("GET");
      conn.setRequestProperty("Accept", "application/json");

      if (conn.getResponseCode() != 200) {
        throw new RuntimeException("Failed: HTTP error code: " + conn.getResponseCode());
      }
      BufferedReader br = new BufferedReader(new InputStreamReader(
          conn.getInputStream()
      ));
      String output;
      while ((output = br.readLine()) != null) {
        System.out.println(output);
      }
      conn.disconnect();
    } catch (IOException e) {
      e.printStackTrace();
    }

  }

}

My task is to create a web service that returns data in JSON format from "some URL". I want to create a RESTful web service but I do not realize how to modify the code to serve it as a web service. Can anybody explain/show what else I should do?

Answer 1

Here is a Jersey resource example:

@Path("rest/heartbeat")
public class HeartbeatResource {

    @GET
    @Produces(MediaType.APPLICATION_XML)
    public Response heartbeatGet() {
        return Response.status(Status.OK).type(MediaType.APPLICATION_XML)
                .entity(new Messages("I am alive!")).build();
    }
}

Do some research and choose a solid REST framework, if it happens to be Jersey then you can find needed learning documents at: https://jersey.java.net/

Answer 2

I prefer Apace Wink to develop RESTful services.. It gives you capability to tune the API as per you need . http://wink.apache.org/