java - 无法在 REST/JERSEY 中调用 @DELETE Web 服务

Question

我正在使用 Jersey Framework(JAX-RS 实现)来构建 RESTful Web 服务。

我无法使用 @DELETE REST 方法，因为当我尝试调用它时它会抛出异常。以下 @DELETE 方法用于删除员工:

@Path("/employees")
public class EmpResource {

@DELETE
@Consumes(MediaType.APPLICATION_JSON)
public Response deleteEmployee(JAXBElement<String> r) throws ClassNotFoundException, SQLException {

    String name = r.getValue();
    String response = DAOaccess.deleteEmp(name);
    return Response.noContent().build();    

}

我使用以下代码块来调用该服务:

Client client = Client.create();
WebResource webResource = client.resource("http://localhost:8080/RestApp/sample/employees");
String input = "{\"name\":\"John\"}";
ClientResponse response = webResource.type(MediaType.APPLICATION_JSON).delete(ClientResponse.class,input);

当我运行客户端时，它抛出以下异常:

Exception in thread "main" com.sun.jersey.api.client.ClientHandlerException: java.net.ProtocolException: HTTP method DELETE doesn't support output
at com.sun.jersey.client.urlconnection.URLConnectionClientHandler.handle(URLConnectionClientHandler.java:151)
at com.sun.jersey.api.client.Client.handle(Client.java:648)
at com.sun.jersey.api.client.WebResource.handle(WebResource.java:680)
at com.sun.jersey.api.client.WebResource.access$200(WebResource.java:74)
at com.sun.jersey.api.client.WebResource$Builder.delete(WebResource.java:599)

如果有人能指导我如何解决这个问题，那就太好了？

Answer 1

这是 HTTPUrlConnection 类实现中的 java 错误:

http://bugs.sun.com/view_bug.do?bug_id=7157360

应该在java 8中解决......

同时，实际上，要将 json 发送到 REST 服务，您必须像 @Micer 所说的那样发送路径参数，或者创建您自己的 HttpUrlConnection，将请求方法设置为 POST 并使用“X-HTTP_method-”覆盖它Override”表示您希望 DELETE 执行如下操作:

  public static void remove(String dflowname) throws IOException, ParseException {
    String jsonResponse = "";

    URL url = new URL(deleteuri);
    HttpURLConnection connection = null;
    connection = (HttpURLConnection) url.openConnection();
    connection.setRequestMethod("POST");
    // We have to override the post method so we can send data
    connection.setRequestProperty("X-HTTP-Method-Override", "DELETE");
    connection.setDoOutput(true);

    // Send request
    OutputStreamWriter wr = new OutputStreamWriter(
      connection.getOutputStream());
    wr.write(dflowname);
    wr.flush();

    // Get Response
    BufferedReader rd = new BufferedReader(new InputStreamReader(connection.getInputStream()));
    String line;
    while ((line = rd.readLine()) != null) {
      jsonResponse = jsonResponse.concat(line);
    }
    wr.close();
    rd.close();

    JSONParser parser = new JSONParser();
    JSONObject obj = (JSONObject) parser.parse(jsonResponse);
    System.out.println(obj.get("status").toString());
  }

来源:https://groups.google.com/a/openflowhub.org/forum/#!msg/floodlight-dev/imm_8drWOwU/Uu4h_u3H6HcJ