将变量传递给 Jersey 中的资源 class

Question

我正在尝试使用一个变量，该变量通过命令行参数传递给主函数，并且应该以某种方式在球衣的资源 class 中可见。

我的主要功能：

public class MyApp extends ResourceConfig {

    public MyApp(String directory) {

        // I would like the MyResource.class to have access to the 
        // variable that is passed in the main function below, 
        // which is the directory variable
        register(MyResurce.class);
    }

    public void startHttpServer(int port) { ... }

    // args[0]: a port to start a HTTP server
    // args[1]: a string that is CONSTANT and UNIQUE throughout the 
    // full execution of the app, and the MyResource.class resource        
    // should be able to read it. How can I pass this variable to the resource?
    public static void main(String[] args)  {
            final MyApp app = new MyApp(args[1]);
            int port = Integer.parseInt(args[0]);
            app.startHttpServer(port);
    }
}

资源class没有什么特别之处，只有@GET、@DELETE和@POST方法。我应该怎么做才能使 args[1] 中给出的变量不仅对 MyResource.class 可见，而且对所有已注册的资源可见？

Answer 1

如果您在资源 class 中注入 JAX-RS 应用程序，您可以访问属性 Map:

@Path(...)
public class MyResource {

    @Context
    private Application app;

    @GET
    @Path(...)
    public String someMethod() {
        String directory = app.getProperties().get("directory");
        ...
    }
}

那么，你的主要 class 会是这样的：

public class MyApp extends ResourceConfig {

    public MyApp(String directory) {
        register(MyResource.class);

        Map<String, Object> properties = new HashMap<>();
        properties.put("directory", directory);
        setProperties(properties);
    }

    public void startHttpServer(int port) { ... }

    public static void main(String[] args)  {
        final MyApp app = new MyApp(args[1]);
        int port = Integer.parseInt(args[0]);
        app.startHttpServer(port);
    }
}

您可以执行上述操作，因为 ResourceConfig 扩展了 Application。

将变量传递给 Jersey 中的资源 class

Pass variable to resource class in Jersey

java

resources

jersey