请你用java写一个HTTP2服务端推送数据至客户端的示例
时间: 2023-12-08 11:06:32 浏览: 146
JAVA实现HTTP传输实例
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好的,以下是一个简单的 Java HTTP/2 服务器端推送数据至客户端的示例代码:
```java
import java.io.IOException;
import java.net.InetSocketAddress;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLParameters;
import org.eclipse.jetty.alpn.server.ALPNServerConnectionFactory;
import org.eclipse.jetty.http2.HTTP2Cipher;
import org.eclipse.jetty.http2.server.HTTP2ServerConnectionFactory;
import org.eclipse.jetty.server.ConnectionFactory;
import org.eclipse.jetty.server.HttpConfiguration;
import org.eclipse.jetty.server.HttpConnectionFactory;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.server.ServerConnector;
import org.eclipse.jetty.server.SslConnectionFactory;
import org.eclipse.jetty.server.handler.AbstractHandler;
import org.eclipse.jetty.server.handler.ResourceHandler;
import org.eclipse.jetty.util.ssl.SslContextFactory;
public class Http2ServerPushExample {
public static void main(String[] args) throws Exception {
SSLContext sslContext = SSLContext.getDefault();
SslContextFactory.Server sslContextFactory = new SslContextFactory.Server();
sslContextFactory.setSslContext(sslContext);
SSLParameters sslParameters = sslContext.getDefaultSSLParameters();
sslParameters.setCipherSuites(HTTP2Cipher.valuesAsString());
sslContextFactory.setSslParameters(sslParameters);
HttpConfiguration httpConfig = new HttpConfiguration();
httpConfig.setSecureScheme("https");
httpConfig.setSecurePort(8443);
httpConfig.addCustomizer(new org.eclipse.jetty.server.HttpConfiguration.Customizer() {
@Override
public void customize(ConnectorFactory factory) {
HttpConnectionFactory http1 = factory.getConnectionFactory(HttpConnectionFactory.class);
http1.getHttpConfiguration().setSendXPoweredBy(false);
http1.getHttpConfiguration().setSendServerVersion(false);
}
});
ResourceHandler resourceHandler = new ResourceHandler();
resourceHandler.setWelcomeFiles(new String[] { "index.html" });
resourceHandler.setResourceBase("./webapp");
Server server = new Server();
ServerConnector connector = new ServerConnector(
server,
new ConnectionFactory[] {
new SslConnectionFactory(sslContextFactory, "http/1.1"),
new ALPNServerConnectionFactory(),
new HTTP2ServerConnectionFactory(httpConfig)
}
);
connector.setPort(8443);
server.addConnector(connector);
server.setHandler(new AbstractHandler() {
@Override
public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
if (target.equals("/")) {
response.setContentType("text/html;charset=utf-8");
response.setStatus(HttpServletResponse.SC_OK);
response.getWriter().println("<html><head><title>HTTP/2 Server Push Example</title></head><body><p>HTTP/2 Server Push Example</p></body></html>");
baseRequest.setHandled(true);
ExecutorService executorService = Executors.newSingleThreadExecutor();
PushBuilder pushBuilder = request.newPushBuilder();
if (pushBuilder != null) {
pushBuilder.path("/css/style.css")
.addHeader("content-type", "text/css")
.push();
executorService.submit(() -> {
try {
Thread.sleep(3000);
response.getWriter().println("<link rel=\"stylesheet\" href=\"/css/style.css\">");
} catch (InterruptedException | IOException e) {
e.printStackTrace();
}
});
}
}
}
});
server.start();
server.join();
}
}
```
这个示例使用了 Jetty HTTP/2 服务器,监听本地 8443 端口。当客户端访问根路径时,服务器会返回一个 HTML 页面,并且推送一个样式表文件 `/css/style.css`。在服务器推送文件之后,我们可以使用一个单独的线程来延迟三秒钟,然后将样式表链接插入到 HTML 页面中。由于服务器已经推送了样式表文件,因此客户端可以立即渲染页面,而不需要等待样式表加载完毕。
这个示例只是非常基础的 HTTP/2 服务器端推送数据至客户端的示例,实际应用中可能需要更多的功能和优化。
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