如何将 CORS 标头添加到 Jersey 2 中灰熊服务器的 StaticHttpHandler 提供的响应？

Posted 2023-03-04

【中文标题】如何将 CORS 标头添加到 Jersey 2 中灰熊服务器的 StaticHttpHandler 提供的响应？

【英文标题】：How to add CORS header to response served from StaticHttpHandler of Grizzly server in Jersey 2?

【发布时间】：2020-02-09 06:52:40

【问题描述】：

如何将标头 CORS（Access-Control-Allow-Origin，Access-Control-Allow-Methods）添加到 Jersey（2.2 版）中由 staticHttpHandler 提供的文件的每个响应文件？

我尝试添加 CorsResponseFilter，但它对静态内容没有帮助。

public static void main(String[] args) throws Exception 
    String BASE_URI = "http://localhost:8081/";
    final ResourceConfig rc = new ResourceConfig().packages("org.example");
    rc.register(CorsResponseFilter.class);
    HttpServer server = GrizzlyHttpServerFactory.createHttpServer(URI.create(BASE_URI), rc);

    File dir = new File(ClassLoader.getSystemClassLoader().getResource(".").getPath());
    StaticHttpHandler staticHttpHandler = new StaticHttpHandler(dir.getPath());
    server.getServerConfiguration().addHttpHandler(staticHttpHandler, "/data/");

    System.out.println("Press Enter to stop Restful service");
    System.in.read();
    server.shutdownNow();

这个 CorsResponseFilter 类为来自 Jersey 应用程序的资源类的每个响应添加标头。但它不会为静态文件添加标题。我还检查了浏览器和邮递员是否可以访问文件（但没有 cors 标头）。我在尝试从 javascript 单页应用程序中获取文件时收到错误消息。

【参考方案1】：

以下代码适用于我：

    public static HttpServer startServer (String base) 
       final ResourceConfig rc = new ResourceConfig().packages("com.mypackage");
       rc.register(MultiPartFeature.class);
       rc.register(new CORSFilter());
       rc.register(CORSFilter.class);
       rc.register(JacksonFeature.class);
       HttpServer server =  GrizzlyHttpServerFactory.createHttpServer(URI.create(base), rc);
       CLStaticHttpHandler staticHandler = new CLStaticHttpHandler(MainServer.class.getClassLoader(), "static/" );
       staticHandler.setFileCacheEnabled(false); // change to true in the deploy time
       server.getServerConfiguration().addHttpHandler(staticHandler, "/");

      CompressionConfig compressionConfig
            = server.getListener("grizzly").getCompressionConfig();
      compressionConfig.setCompressionMode(CompressionConfig.CompressionMode.ON); // the mode
      compressionConfig.setCompressionMinSize(1); // the min amount of bytes to compress
      compressionConfig.setCompressableMimeTypes("text/plain", "text/html"); // the mime types to compress
      return server;
  

这是 CORSFilter 类

   import javax.ws.rs.container.ContainerRequestContext;
   import javax.ws.rs.container.ContainerResponseContext;
   import javax.ws.rs.container.ContainerResponseFilter;
   import javax.ws.rs.core.MultivaluedMap;

   public class CORSFilter implements ContainerResponseFilter 

   public void filter(ContainerRequestContext requestContext, ContainerResponseContext responseContext) 

      MultivaluedMap<String, Object> headers = responseContext.getHeaders();

      headers.add("Access-Control-Allow-Origin", "*");
      headers.add("Access-Control-Allow-Methods", "GET, POST, DELETE, PUT");
      headers.add("Access-Control-Allow-Headers", "Content-Type");