Jetty

我就是我 2022-06-03 03:24 145阅读 0赞

本文介绍一个使用Jetty开发的Web的小例子。

Jetty是一个开源的servlet容器，它为基于Java的web容器（例如JSP和servlet）提供运行环境。可以把它理解为和Tomcat一样，不过Jetty更小更轻量级。如果想更深入学习Jetty推荐看：http://blog.sina.com.cn/s/blog\_9ed7f0d70101ivsu.html，这里面的一系列的文章分别对jetty服务流程、对静态资源的访问方法、把servlet部署到jetty里面、ContextHandler 的使用，都做了非常简洁、通俗易懂的介绍，本文就“**把servlet部署到jetty里面**”做介绍

本文使用的Maven建工程，对Maven不熟悉的请看：http://blog.csdn.net/tiandixuanwuliang/article/details/78752881

下面开始介绍这个小例子：

1、在maven项目中配置jetty和servlet

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    	<modelVersion>4.0.0</modelVersion>
    	<groupId>testJetty</groupId>
    	<artifactId>testJetty</artifactId>
    	<version>0.0.1-SNAPSHOT</version>
    	<packaging>war</packaging>
    	<properties>
    		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    		<project.compile.version>1.8</project.compile.version>
    		<servlet.version>3.1.0</servlet.version>
    		<jsp.version>2.2</jsp.version>
    		<jstl.version>1.2.5</jstl.version>
    		<jetty.version>8.1.10.v20130312</jetty.version>
    	</properties>
    	<dependencies>
    		
    		<dependency>
    			<groupId>javax.servlet</groupId>
    			<artifactId>javax.servlet-api</artifactId>
    			<version>${servlet.version}</version>
    		</dependency>
    		<dependency>
    			<groupId>javax.servlet.jsp</groupId>
    			<artifactId>jsp-api</artifactId>
    			<version>${jsp.version}</version>
    		</dependency>
    		<dependency>
    			<groupId>org.apache.taglibs</groupId>
    			<artifactId>taglibs-standard-compat</artifactId>
    			<version>${jstl.version}</version>
    		</dependency>
    		<dependency>
    			<groupId>org.apache.taglibs</groupId>
    			<artifactId>taglibs-standard-impl</artifactId>
    			<version>${jstl.version}</version>
    		</dependency>
    		<dependency>
    			<groupId>org.apache.taglibs</groupId>
    			<artifactId>taglibs-standard-jstlel</artifactId>
    			<version>${jstl.version}</version>
    		</dependency>
    		<dependency>
    			<groupId>org.apache.taglibs</groupId>
    			<artifactId>taglibs-standard-spec</artifactId>
    			<version>${jstl.version}</version>
    		</dependency>
    		
    
    		
    		<dependency>
    			<groupId>org.eclipse.jetty</groupId>
    			<artifactId>jetty-server</artifactId>
    			<version>9.0.0.v20130308</version>
    		</dependency>
    		<dependency>
    			<groupId>org.eclipse.jetty</groupId>
    			<artifactId>jetty-webapp</artifactId>
    			<version>9.0.0.v20130308</version>
    		</dependency>
    		<dependency>
    			<groupId>org.eclipse.jetty</groupId>
    			<artifactId>jetty-continuation</artifactId>
    			<version>9.0.0.v20130308</version>
    		</dependency>
    		<dependency>
    			<groupId>org.eclipse.jetty</groupId>
    			<artifactId>jetty-jsp</artifactId>
    			<version>9.0.0.v20130308</version>
    		</dependency>
    		
    	</dependencies>
    </project>

2、写一个Servlet

import java.io.IOException;
    
    import javax.servlet.ServletException;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    @SuppressWarnings("serial")
    public class MainServlet extends HttpServlet{
    	@Override
    	protected void doGet(HttpServletRequest req, HttpServletResponse resp)
    			throws ServletException, IOException {
    		req.setCharacterEncoding("utf-8");
    		resp.setCharacterEncoding("utf-8");
    		resp.setHeader("content-type","text/html;charset=UTF-8");
    		System.out.println("servlet运行起来了");
    		resp.getWriter().write("servlet运行起来了");
    		resp.getWriter().close(); 
    	}
    }

3、写Jetty启动文件（注意：不能加包名）

import org.eclipse.jetty.server.Server;
    import org.eclipse.jetty.servlet.ServletContextHandler;
    import org.eclipse.jetty.servlet.ServletHolder;
    
    import com.welljoint.MainServlet;
    public class HelloJetty {
    
    	/**
    	 * @throws Exception 
    	 * @Title: main 
    	 * @Description:启动jetty,程序入口
    	 * @param args
    	 * @throws 
    	 */
    	public static void main(String[] args) throws Exception
    	{
      Server server = new Server(8080);
      //servletContextHandler是把servlet部署到jetty里面的桥梁
      ServletContextHandler context = new ServletContextHandler(ServletContextHandler.SESSIONS);  
      //所有请求都要经过jetty   
      context.setContextPath("/"); 
      server.setHandler(context);
      //配置servlet请求路径 
      context.addServlet(new ServletHolder(new MainServlet()), "/hello");  
           
    	    server.start();
    	    server.join();
    	}
    }

4、在Jetty的类的main方法上单击右键选择java项目运行方式（注意是像运行java项目一样运行）

如图：  
![20171222170844672][]

[20171222170844672]: /images/20220603/4d6b15baac3942f7922cce745f844eab.png