Question

我是Spring框架的新手，并尝试创建一个api供其他人使用。

这是我的控制器类

POST方法

 // -------------------Create a Report-------------------------------------------

@RequestMapping(value = "/report/", method = RequestMethod.POST)
public ResponseEntity<?> createReport(@RequestBody Report report, UriComponentsBuilder ucBuilder) {
    logger.info("Creating Report : {}", report);

    if (reportRepository.isReportExist(report)) {
        logger.error("Unable to create. A report with name {} already exist", report.getCrisisID());
        return new ResponseEntity(new CustomErrorType("Unable to create. A Report with crisisID " + 
        report.getCrisisID() + " already exist."),HttpStatus.CONFLICT);
    }
    reportRepository.saveReport(report);

    HttpHeaders headers = new HttpHeaders();
    headers.setLocation(ucBuilder.path("/api/report/{crisisID}").buildAndExpand(report.getCrisisID()).toUri());
    return new ResponseEntity<String>(headers, HttpStatus.CREATED);
}

获取方法

// -------------------Retrieve All Reports---------------------------------------------

@RequestMapping(value = "/report/", method = RequestMethod.GET)
public ResponseEntity<List<Report>> listAllReports() {
    List<Report> reports = reportRepository.findAllReports();
    if (reports.isEmpty()) {
        return new ResponseEntity(HttpStatus.NO_CONTENT);
        // You many decide to return HttpStatus.NOT_FOUND
    }
    return new ResponseEntity<List<Report>>(reports, HttpStatus.OK);
}

以下是其他人创建报告对象并将其发送到我的api的示例代码。

// POST 
    private static void createReport() {
    System.out.println("Testing create Report API----------");

    RestTemplate restTemplate = new RestTemplate();
    Report report = new Report(20, "General", 4, "AA1",10000,"crisis details", "1 hour", "COA1", "COA1");
    URI uri = restTemplate.postForLocation(REST_SERVICE_URI + "/report/", report,
            Report.class);System.out.println("Location : "+uri.toASCIIString());
    }

我想知道以下是否可行或是否有办法解决这种情况：

当有人创建报告并通过POST URL将其发送给我时，我的POST方法将能够自动检测到是否创建了新的报告条目，然后在我的HTML / JSP页面中发送通知（例如弹出窗口）窗口）。

更新

RestApiController.java

   @RestController
@RequestMapping("/api")
public class RestApiController {

    public static final Logger logger = LoggerFactory.getLogger(RestApiController.class);

    @Autowired
    ReportRepository reportRepository; //Service which will do all data retrieval/manipulation work


    // -------------------Create a Report-------------------------------------------
    @RequestMapping(value = "/report/", method = RequestMethod.POST)
    @SendTo("/channel/publicreport")
    public ResponseEntity<?> createReport(@RequestBody Report report, UriComponentsBuilder ucBuilder) {
        logger.info("Creating Report : {}", report);

        if (reportRepository.isReportExist(report)) {
            logger.error("Unable to create. A report with name {} already exist", report.getCrisisID());
            return new ResponseEntity(new CustomErrorType("Unable to create. A Report with crisisID " + 
            report.getCrisisID() + " already exist."),HttpStatus.CONFLICT);
        }
        reportRepository.saveReport(report);

        HttpHeaders headers = new HttpHeaders();
        headers.setLocation(ucBuilder.path("/api/report/{crisisID}").buildAndExpand(report.getCrisisID()).toUri());
        return new ResponseEntity<String>(headers, HttpStatus.CREATED);
    }
}

WebSocketConfig.java

 @Configuration
    @EnableWebSocketMessageBroker
    public class WebSocketConfig extends AbstractWebSocketMessageBrokerConfigurer {

        @Override
        public void registerStompEndpoints(StompEndpointRegistry registry) {
            registry.addEndpoint("/chatservice");
        }

        @Override
        public void configureMessageBroker(MessageBrokerRegistry registry) {
            registry.setApplicationDestinationPrefixes("/app");
            registry.enableSimpleBroker("/channel");
        }
    }

main.js

    'use strict';

var stompClient = null;
var username = null;

function connectReport(event) {
    username = "myname";

    if(username) {

        //var socket = new SockJS('/ws');
        //stompClient = Stomp.over(socket);
        stompClient = Stomp.client('ws://localhost:8080/chatservice');

        stompClient.connect({}, onConnectedReport, onError);
    }
    event.preventDefault();
}

function onConnectedReport() {
    // Subscribe to the Public Channel
    stompClient.subscribe('/channel/publicreport',onReportMessageReceived);
}
function onError(error) {
    connectingElement.textContent = 'Could not connect to WebSocket server. Please refresh this page to try again!';
    connectingElement.style.color = 'red';
}
function onReportMessageReceived(payload) {
//Code for pop up window
}
window.addEventListener("load", connectReport, true)

Answer 1

一般来说，这样的人被委托给客户。即客户端轮询服务器以获取它感兴趣的更改，并且一旦检测到客户端做出相应的反应。最古老的方式（现在已经过时）是在HTML中添加标签，强制整个页面以特定频率刷新，这意味着页面向服务器发送请求并接收要显示的更新页面。在我们这个时代，有各种框架对页面进行部分更新。其中一个是Ajax，然后是DHTML，依此类推。我不是客户端progrqammer。但就概念而言，此类任务通常会提供给客户

HTTP POST通知

1 个答案: