如何从RestyGWT部分发送请求到另一个服务器项目

Question

我有restyGWT+GXT项目，向服务器项目(Spring Boot)发送请求，所以，我的restyGWT+GXT部分:

buiid.gradle:

...
compile 'org.fusesource.restygwt:restygwt:2.0.3'
compile 'javax.ws.rs:jsr311-api:1.1.1'

我的rest服务在restyGWT+GXT部分:

import org.fusesource.restygwt.client.MethodCallback;
import org.fusesource.restygwt.client.RestService;
import javax.ws.rs.Consumes;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import java.util.List;
public interface LoadHelloService extends RestService {
    @GET
    @Path("/rest/loadHelloService")
    @Consumes(MediaType.APPLICATION_JSON)
    @Produces(MediaType.APPLICATION_JSON)
    public void loadHelloService(MethodCallback<List<Hello>> callback);
}

豆Hello.java:

public class Hello {
    private final String id;
    private final String name;
    @JsonCreator
    public Hello(@JsonProperty("id") String id, @JsonProperty("name") String name) {
        this.id = id;
        this.name = name;
    }
    public String getId() {
        return id;
    }
    public String getName() {
        return name;
    }
}

in MainMenuPage (implements IsWidget):on click menuButton1发送请求到服务器项目(Spring Boot):

    @UiHandler("menuButton1")
    void selectOnMenu1(SelectEvent event) {
        ...
        restServerLoader.loadHelloListFromServer();        
    }

因此，RestServerLoader类与方法loadHelloListFromServer:

import com.google.gwt.core.client.GWT;
import com.sencha.gxt.widget.core.client.box.MessageBox;
import org.fusesource.restygwt.client.*;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class RestServerLoader {
   public void loadHelloListFromServer() {
        String pageBaseUrl = "http://127.0.0.1:8080/";
        Defaults.setServiceRoot(pageBaseUrl);
        Map<String, String> headers = new HashMap<>();
        headers.put("Access-Control-Allow-Methods", "GET");
        Resource resource = new Resource(Defaults.getServiceRoot(), headers);
        LoadHelloService service = GWT.create(LoadHelloService.class);
        ((RestServiceProxy)service).setResource(resource);
        service.loadHelloService(new MethodCallback<List<Hello>>() {
            public void onSuccess(Method method, List<Hello> response) {
                MessageBox messageBox = new MessageBox("response (list) = " + response.toString());
                messageBox.show();
                //code your stuff here
            }
            public void onFailure(Method method, Throwable exception) {
                MessageBox messageBox = new MessageBox("exception = " + exception);
                messageBox.show();
                //code your stuff here
            }

        });
   }
}

所以，当我发送请求loadHelloService时，我有:org.fusesource.restygwt.client.FailedStatusCodeException: status code 0.:(((((((

my server part (Spring Boot) rest:

import javax.servlet.http.HttpServletResponse;
import javax.ws.rs.*;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import java.util.ArrayList;
import java.util.List;
@Path("/")
@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.APPLICATION_JSON)
public class HelloResource {
    @Context
    private HttpServletResponse response;

    @OPTIONS
    @Path("loadHelloService") //The response for the preflight request made implicitly by the bowser
    public Response loadHelloPreflight() {
        Response response = Response.ok()
                .header("Access-Control-Allow-Origin", "*")
                .header("Access-Control-Allow-Methods", "POST, GET, UPDATE, OPTIONS")
                .header("Access-Control-Allow-Headers", "*")
                .header("Access-Control-Max-Age", "18000").build();
        return response;
    }
    @GET
    @Path("loadHelloService")
    public List<Hello> loadHelloList() {
        response.addHeader("Access-Control-Allow-Origin", "*");
        response.addHeader("Access-Control-Allow-Methods", "POST, GET, UPDATE, OPTIONS");
        response.addHeader("Access-Control-Allow-Headers", "*");
        List<Hello> list = new ArrayList<>();
        list.add(new Hello("1", "ronan"));
        list.add(new Hello("2", "john"));
        return list;
    }
}

所以，当我发送请求，我输入方法loadHelloPreflight，但当发送请求到loadHelloList我有:org.fusesource.restygwt.client.FailedStatusCodeException: status code 0.，为什么?:(，当我发送请求到服务器部分(Spring Boot)从浏览器邮差客户端-一切都好!，我得到的hello列表，但我想做到这一点，从restyGWT+GXT部分:()((帮助我，请。

Answer 1

您是否忘记了下面的一些cors标题?

.header("Access-Control-Allow-Headers", "x-http-method-override");