jetty服务器--嵌入式环境使用 java应用服务器jetty

jetty服务器是十分优秀的java web应用服务器，支持的java的 jsp和 servlet标准，跟tomcat一样很受欢迎，，另外jetty更轻量一些，允许将jetty嵌入到程序中执行，在某些场景下十分有用。

jetty嵌入式环境的使用

内置jetty服务器

package com.gbcom.frame.jetty.demo;


import org.eclipse.jetty.server.Handler;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.server.handler.ContextHandler;
import org.eclipse.jetty.server.handler.ContextHandlerCollection;
import org.eclipse.jetty.server.handler.DefaultHandler;
import org.eclipse.jetty.server.handler.HandlerCollection;
import org.eclipse.jetty.server.nio.SelectChannelConnector;
import org.eclipse.jetty.util.thread.QueuedThreadPool;

/**
 * 创建服务器：
 * 启动服务，通过浏览器访问： http://localhost:8888/index 和 http://localhost:8888/hello
 * 
 * 
 * mvn 参考：2.0. 添加依赖

<dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>3.1.0</version>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>org.eclipse.jetty.aggregate</groupId>
      <artifactId>jetty-all</artifactId>
      <version>7.6.9.v20130131</version>
    </dependency>

如果在应用中使用到jsp的话需要添加jetty-jsp依赖，在jetty-all中并为聚合jetty-jsp模块。

 * @author SYZ
 * @date 2016-2-23 上午09:54:01
 * @version 1.0.0
 * @see com.gbcom.frame.jetty.demo.EmbedJettyServer
 */
public class EmbedJettyServer {

  public static void main(String[] args) throws Exception {
    // 创建Server
    Server server = new Server();

    // 添加ThreadPool
    QueuedThreadPool queuedThreadPool = new QueuedThreadPool();
    queuedThreadPool.setName("queuedTreadPool");
    queuedThreadPool.setMinThreads(10);
    queuedThreadPool.setMaxThreads(200);

    server.setThreadPool(queuedThreadPool);

    // 添加Connector
    SelectChannelConnector connector = new SelectChannelConnector();
    connector.setPort(8888);
    connector.setAcceptors(4);
    connector.setMaxBuffers(2048);
    connector.setMaxIdleTime(10000);

    server.addConnector(connector);

    // 添加Handler
    ContextHandlerCollection context = new ContextHandlerCollection();
    ContextHandler contextHandler = context.addContext("/", "/");
    contextHandler.setHandler(new DispatchHandler());

    Handler defaults = new DefaultHandler();

    HandlerCollection collection = new HandlerCollection();
    collection.setHandlers(new Handler[] { context, defaults });

    server.setHandler(collection);

    // 启动服务
    server.start();
    while (server.isStarted()) {
      System.out.println("server starting...");
      break;
    }
    System.out.println("server stared...");
    System.out.println("ContextHandlerCollectio.getServer() = "
        + context.getServer().hashCode());
    System.out.println("Server:" + server.hashCode());
    server.join();
  }
}

分发器：DispatchHandler

package com.gbcom.frame.jetty.demo;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.eclipse.jetty.server.Request;
import org.eclipse.jetty.server.handler.AbstractHandler;
/**
 * 编写分发处理类DispatchHandler
 * 
 * @author SYZ
 * @date 2016-2-23 上午09:54:34
 * @version 1.0.0
 * @see com.gbcom.frame.jetty.demo.DispatchHandler
 */
public class DispatchHandler extends AbstractHandler {

  public void handle(String target, Request baseRequest,
      HttpServletRequest request, HttpServletResponse response)
      throws IOException, ServletException {

    /**
     * 这里将是根据不同的请求来分发给不同的Handler来处理
     */
    if (target.equals("/index")) {
      new IndexHandler().handle(target, baseRequest, request, response);
    } else {
      new HelloHandler().handle(target, baseRequest, request, response);
    }
  }
}

业务处理

package com.gbcom.frame.jetty.demo;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Calendar;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.eclipse.jetty.server.Request;
import org.eclipse.jetty.server.handler.AbstractHandler;
/**
 * 编写相应的Handler（IndexHandler和HelloHandler）
 * 
 * @author SYZ
 * @date 2016-2-23 上午09:54:45
 * @version 1.0.0
 * @see com.gbcom.frame.jetty.demo.IndexHandler
 */
public class IndexHandler extends AbstractHandler {

	  @Override
	  public void handle(String target, Request baseRequest,
	      HttpServletRequest request, HttpServletResponse response)
	      throws IOException, ServletException {

	    response.setCharacterEncoding("UTF-8");
	    response.setContentType("text/html;charset=UTF-8");

	    PrintWriter out = response.getWriter();
	    out.write("<h3>Hello World Jetty!</h3>");
	    out.write(Calendar.getInstance().getTime().toString());
	    out.flush();
	    out.close();
	    
	    System.out.println("process http success!!!!");
	  }


	}

package com.gbcom.frame.jetty.demo;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.eclipse.jetty.server.Request;
import org.eclipse.jetty.server.handler.AbstractHandler;
/**
 * 编写相应的Handler（IndexHandler和HelloHandler）
 * @author SYZ
 * @date 2016-2-23 上午09:54:55
 * @version 1.0.0
 * @see com.gbcom.frame.jetty.demo.HelloHandler
 */
public class HelloHandler extends AbstractHandler {

	  public void handle(String target, Request baseRequest,
	      HttpServletRequest request, HttpServletResponse response)
	      throws IOException, ServletException {

	    response.setContentType("text/html;charset=UTF-8");
	    PrintWriter out = response.getWriter();
	    out.write("<h3>This is a HelloHandler and contextPath is '/hello'.</h3>");
	    out.flush();
	    out.close();
	  }
	}