Question

我正在尝试使用与Jersey一起使用服务器发送的事件配置基本广播服务器。我使用了官方文档中包含的示例代码：

public class Broadcast {


@Singleton
@Path("broadcasting")
public static class BroadcasterResource {

    private SseBroadcaster broadcaster = new SseBroadcaster();

    /**
     * Server receives a message and broadcasts to its suscribers 
     * @param message
     * @return 
     */
    @POST
    @Produces(MediaType.TEXT_PLAIN)
    @Consumes(MediaType.TEXT_PLAIN)
    public String broadcastMessage(String message) {
        OutboundEvent.Builder eventBuilder = new OutboundEvent.Builder();
        OutboundEvent event = eventBuilder.name("message")
            .mediaType(MediaType.TEXT_PLAIN_TYPE)
            .data(String.class, message)
            .build();

        broadcaster.broadcast(event);

        return "Message '" + message + "' has been broadcast.";
    }

    /**
     * Suscribes the client to the broadcaster
     * @return 
     */
    @GET
    @Produces(SseFeature.SERVER_SENT_EVENTS)
    public EventOutput listenToBroadcast() {
        final EventOutput eventOutput = new EventOutput();
        this.broadcaster.add(eventOutput);
        return eventOutput;
    }
}
}

的web.xml：

<web-app id="TestSSE" version="3.0"
    xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
    http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
    <display-name>TestSSE</display-name>        
    <servlet>
        <async-supported>true</async-supported>
        <servlet-name>jersey-servlet</servlet-name>
        <servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>             
        <init-param>
            <param-name>jersey.config.server.provider.packages</param-name>
            <param-value>com.mycompany.testsse.sse</param-value>
        </init-param>       
        <load-on-startup>1</load-on-startup>                
    </servlet>

    <servlet-mapping>
        <servlet-name>jersey-servlet</servlet-name>
        <url-pattern>/v2/*</url-pattern>
    </servlet-mapping>

</web-app>

和pom.xml：

http://maven.apache.org/xsd/maven-4.0.0.xsd"> 4.0.0

    <groupId>com.mycompany</groupId>
    <artifactId>TestSSE</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>war</packaging>

    <name>TestSSE</name>

    <properties>
    <endorsed.dir>${project.build.directory}/endorsed</endorsed.dir>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

    <dependencies>
    <dependency>
        <groupId>javax</groupId>
        <artifactId>javaee-web-api</artifactId>
        <version>7.0</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>org.glassfish.jersey.core</groupId>
        <artifactId>jersey-server</artifactId>
        <version>2.8</version>
    </dependency>
    <dependency>
        <groupId>org.glassfish.jersey.core</groupId>
        <artifactId>jersey-common</artifactId>
        <version>2.8</version>
    </dependency>
    <dependency>
        <groupId>org.glassfish.jersey.containers</groupId>
        <artifactId>jersey-container-servlet-core</artifactId>
        <version>2.8</version>
    </dependency>
    <dependency>
        <groupId>org.glassfish.jersey.containers</groupId>
        <artifactId>jersey-container-servlet</artifactId>
        <version>2.8</version>
    </dependency>
    <dependency>
        <groupId>org.glassfish.jersey.media</groupId>
        <artifactId>jersey-media-sse</artifactId>
        <version>2.8</version>
    </dependency>
    <dependency>
        <groupId>javax.ws.rs</groupId>
        <artifactId>javax.ws.rs-api</artifactId>
        <version>2.0</version>
    </dependency>
    </dependencies>


    <build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.1</version>
            <configuration>
                <source>1.7</source>
                <target>1.7</target>
                <compilerArguments>
                    <endorseddirs>${endorsed.dir}</endorseddirs>
                </compilerArguments>
            </configuration>
        </plugin>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-war-plugin</artifactId>
            <version>2.3</version>
            <configuration>
                <failOnMissingWebXml>false</failOnMissingWebXml>
            </configuration>
        </plugin>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-dependency-plugin</artifactId>
            <version>2.6</version>
            <executions>
                <execution>
                    <phase>validate</phase>
                    <goals>
                        <goal>copy</goal>
                    </goals>
                    <configuration>
                        <outputDirectory>${endorsed.dir}</outputDirectory>
                        <silent>true</silent>
                        <artifactItems>
                            <artifactItem>
                                <groupId>javax</groupId>
                                <artifactId>javaee-endorsed-api</artifactId>
                                <version>7.0</version>
                                <type>jar</type>
                            </artifactItem>
                        </artifactItems>
                    </configuration>
                </execution>
            </executions>
        </plugin>
    </plugins>
    </build>

</project>

我尝试在开发中直接将这个web服务实现到我的应用程序中，并且由于我无法使其工作，我创建了这个基本的maven Web应用程序，除了上面显示的代码之外，为了尝试隔离错误

应用程序按预期工作，但在收到GET请求（而不是POST）时总是抛出此异常。请注意，<async-supported>标记已添加到servlet中。

我正在使用Java EE 7和Tomcat 8.0.27.0

使用Jersey SSE无法摆脱“IllegalStateException：当前链的过滤器或servlet不支持异步操作”异常

0 个答案: