Spring-如何将ServletContext转换为@Service(+如何获取WebApps清单) [英] Spring - how to get ServletContext into a @Service (+ how to get WebApps Manifest)

问题描述

在Web应用程序的@Controllers中，您可以自动连接Servlet上下文，以便(就我而言)可以从Web应用程序获取清单(请参见https://stackoverflow.com/a/615545/1019307 ).

In a Web App's @Controllers you can autowire your Servlet Context so you can (in my case) get the Manifest from the web-app (see https://stackoverflow.com/a/615545/1019307).

@Autowired
ServletContext servletContext;

您如何将其纳入服务?

我实现了这种简单的模式，并认为自己会分享.

I implemented this simple pattern and thought I'd share.

推荐答案

更新:这是一个较差的解决方案，因为它使服务依赖于客户端.有关更新的解决方案，请参见下文.

只需使用@PostConstruct，以便Service在运行之前设置ServletContext.

Simply with a @PostConstruct so that the Service has the ServletContext set before it isRunning.

@Controller
@RequestMapping("/manifests")
public class ManifestEndpoint {
    @Autowired
    private ManifestService manifestService;

    @Autowired
    ServletContext servletContext;

    @PostConstruct
    public void initService() {
        manifestService.setServletContext(servletContext);
    }

然后在服务中一定要检查它的使用情况，因为不能保证.

Then in the service be sure to check it is used, since that can't be guaranteed.

@Component
public class ManifestService {
    ....
    public void setServletContext(ServletContext servletContext) {
        this.servletContext = servletContext;
    }

    private void buildManifestCurrentWebApp() {
        if (servletContext == null) {
            throw new RuntimeException("ServletContext not set");
        }
        # Here's how to complete my example on how to get WebApp Manifest
        try {
            URL thisAppsManifestURL = servletContext.getResource("/META-INF/MANIFEST.MF");
            System.out.println("buildManifestCurrentWebApp - url: "+thisAppsManifestURL);
            buildManifest(thisAppsManifestURL);
        } catch (MalformedURLException e) {
            e.printStackTrace();
        }

---

未使服务依赖于客户端的更新解决方案.

@Controller
@RequestMapping("/manifests")
public class ManifestEndpoint {
    private static final Logger logger = LoggerFactory.logger(ManifestEndpoint.class);
    @Autowired
    private ManifestService manifestService;

    @Autowired
    private ServletContext servletContext;

    @PostConstruct
    public void initService() {
        // We need to use the Manifest from this web app.
        URL thisAppsManifestURL;
        try {
            thisAppsManifestURL = servletContext.getResource("/META-INF/MANIFEST.MF");
        } catch (MalformedURLException e) {
            throw new GeodesyRuntimeException("Error retrieving META-INF/MANIFEST.MF resource from webapp", e);
        }
        manifestService.buildManifest(thisAppsManifestURL);
    }

ManifestService不变(也就是说，现在不需要buildManifestCurrentWebApp()).

The ManifestService doesn't change (that is, there is no need for buildManifestCurrentWebApp() now).

这篇关于Spring-如何将ServletContext转换为@Service(+如何获取WebApps清单)的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！