Jetty 开发指南：嵌入式开发示例

Jetty具有嵌入各种应用程序的丰富历史。 在本节中，我们将向您介绍我们的git存储库中的embedded-jetty-examples项目下的一些简单示例。

重要：生成此文档时，将直接从我们的git存储库中提取这些文件。 如果行号不对齐，请随时在github中修复此文档，并向我们提供拉取请求，或者至少打开一个问题以通知我们该差异。

简单的文件服务器

此示例显示如何在Jetty中创建简单文件服务器。 它非常适合需要实际Web服务器来获取文件的测试用例，它可以很容易地配置为从src / test / resources下的目录提供文件。 请注意，这在文件缓存中没有任何逻辑，无论是在服务器内还是在响应上设置适当的标头。 它只是几行，说明了提供一些文件是多么容易。

//
//  ========================================================================
//  Copyright (c) 1995-2018 Mort Bay Consulting Pty. Ltd.
//  ------------------------------------------------------------------------
//  All rights reserved. This program and the accompanying materials
//  are made available under the terms of the Eclipse Public License v1.0
//  and Apache License v2.0 which accompanies this distribution.
//
//      The Eclipse Public License is available at
//      http://www.eclipse.org/legal/epl-v10.html
//
//      The Apache License v2.0 is available at
//      http://www.opensource.org/licenses/apache2.0.php
//
//  You may elect to redistribute this code under either of these licenses.
//  ========================================================================
//

package org.eclipse.jetty.embedded;

import org.eclipse.jetty.server.Handler;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.server.handler.DefaultHandler;
import org.eclipse.jetty.server.handler.HandlerList;
import org.eclipse.jetty.server.handler.ResourceHandler;

/**
 * Simple Jetty FileServer.
 * This is a simple example of Jetty configured as a FileServer.
 */
public class FileServer
{
    public static void main(String[] args) throws Exception
    {
        // Create a basic Jetty server object that will listen on port 8080.  Note that if you set this to port 0
        // then a randomly available port will be assigned that you can either look in the logs for the port,
        // or programmatically obtain it for use in test cases.
        Server server = new Server(8080);

        // Create the ResourceHandler. It is the object that will actually handle the request for a given file. It is
        // a Jetty Handler object so it is suitable for chaining with other handlers as you will see in other examples.
        ResourceHandler resource_handler = new ResourceHandler();

        // Configure the ResourceHandler. Setting the resource base indicates where the files should be served out of.
        // In this example it is the current directory but it can be configured to anything that the jvm has access to.
        resource_handler.setDirectoriesListed(true);
        resource_handler.setWelcomeFiles(new String[]{ "index.html" });
        resource_handler.setResourceBase(".");

        // Add the ResourceHandler to the server.
        HandlerList handlers = new HandlerList();
        handlers.setHandlers(new Handler[] { resource_handler, new DefaultHandler() });
        server.setHandler(handlers);

        // Start things up! By using the server.join() the server thread will join with the current thread.
        // See "http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Thread.html#join()" for more details.
        server.start();
        server.join();
    }
}

启动后你应该可以导航到http：// localhost：8080 / index.html（假设一个在资源库目录中）。

Maven坐标

要在项目中使用此示例，您需要声明以下Maven依赖项。

<dependency>
  <groupId>org.eclipse.jetty</groupId>
  <artifactId>jetty-server</artifactId>
  <version>${project.version}</version>
</dependency>

Split File Server

此示例构建在简单文件服务器上，以显示如何将多个ResourceHandler链接在一起可以聚合多个目录以在单个路径上提供内容，以及如何将这些目录与ContextHandler链接在一起。

//
//  ========================================================================
//  Copyright (c) 1995-2018 Mort Bay Consulting Pty. Ltd.
//  ------------------------------------------------------------------------
//  All rights reserved. This program and the accompanying materials
//  are made available under the terms of the Eclipse Public License v1.0
//  and Apache License v2.0 which accompanies this distribution.
//
//      The Eclipse Public License is available at
//      http://www.eclipse.org/legal/epl-v10.html
//
//      The Apache License v2.0 is available at
//      http://www.opensource.org/licenses/apache2.0.php
//
//  You may elect to redistribute this code under either of these licenses.
//  ========================================================================
//

package org.eclipse.jetty.embedded;

import java.io.File;

import org.eclipse.jetty.server.Connector;
import org.eclipse.jetty.server.Handler;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.server.ServerConnector;
import org.eclipse.jetty.server.handler.ContextHandler;
import org.eclipse.jetty.server.handler.ContextHandlerCollection;
import org.eclipse.jetty.server.handler.ResourceHandler;
import org.eclipse.jetty.toolchain.test.MavenTestingUtils;
import org.eclipse.jetty.util.resource.Resource;

/**
 * A {@link ContextHandlerCollection} handler may be used to direct a request to
 * a specific Context. The URI path prefix and optional virtual host is used to
 * select the context.
 */
public class SplitFileServer
{
    public static void main( String[] args ) throws Exception
    {
        // Create the Server object and a corresponding ServerConnector and then
        // set the port for the connector. In this example the server will
        // listen on port 8090. If you set this to port 0 then when the server
        // has been started you can called connector.getLocalPort() to
        // programmatically get the port the server started on.
        Server server = new Server();
        ServerConnector connector = new ServerConnector(server);
        connector.setPort(8090);
        server.setConnectors(new Connector[] { connector });

        // Create a Context Handler and ResourceHandler. The ContextHandler is
        // getting set to "/" path but this could be anything you like for
        // builing out your url. Note how we are setting the ResourceBase using
        // our jetty maven testing utilities to get the proper resource
        // directory, you needn't use these, you simply need to supply the paths
        // you are looking to serve content from.
        ResourceHandler rh0 = new ResourceHandler();

        ContextHandler context0 = new ContextHandler();
        context0.setContextPath("/");
        File dir0 = MavenTestingUtils.getTestResourceDir("dir0");
        context0.setBaseResource(Resource.newResource(dir0));
        context0.setHandler(rh0);

        // Rinse and repeat the previous item, only specifying a different
        // resource base.
        ResourceHandler rh1 = new ResourceHandler();

        ContextHandler context1 = new ContextHandler();
        context1.setContextPath("/");
        File dir1 = MavenTestingUtils.getTestResourceDir("dir1");
        context1.setBaseResource(Resource.newResource(dir1));
        context1.setHandler(rh1);

        // Create a ContextHandlerCollection and set the context handlers to it.
        // This will let jetty process urls against the declared contexts in
        // order to match up content.
        ContextHandlerCollection contexts = new ContextHandlerCollection();
        contexts.setHandlers(new Handler[] { context0, context1 });

        server.setHandler(contexts);

        // Start things up!
        server.start();

        // Dump the server state
        System.out.println(server.dump());

        // The use of server.join() the will make the current thread join and
        // wait until the server is done executing.
        // See http://docs.oracle.com/javase/7/docs/api/java/lang/Thread.html#join()
        server.join();
    }
}

启动后，你应该可以导航到http：// localhost：8090 / index.html（假设一个在资源库目录中），你可以正常访问。 任何文件请求都将在第一个资源处理程序中查找，然后在第二个资源处理程序中查找，依此类推。

Maven Coordinates

要在项目中使用此示例，您需要声明以下maven依赖项。 我们建议您不要在实际应用程序中使用工具链依赖项。

<dependency>
  <groupId>org.eclipse.jetty</groupId>
  <artifactId>jetty-server</artifactId>
  <version>${project.version}</version>
</dependency>
<dependency>
  <groupId>org.eclipse.jetty.toolchain</groupId>
  <artifactId>jetty-test-helper</artifactId>
  <version>2.2</version>
</dependency>

参考资料：http://www.eclipse.org/jetty/documentation/9.4.x/embedded-examples.html