spring内嵌jetty容器，实现main方法启动web项目

时间：2022-07-08 13:33:14

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。Jetty是使用Java语言编写的，它的API以一组JAR包的形式发布。开发人员可以将Jetty容器实例化成一个对象，可以迅速为一些独立运行（stand-alone）的Java应用提供网络和web连接。Jetty相比与Tomcat是轻量级的，而且Jetty更灵活，体现在其可插拔性和可扩展性，更易于开发者对Jetty本身进行二次开发，定制一个适合自身需求的Web Server。

Jetty可以向Tomcat一样单独作为一个纯粹的web容器，但是Jetty的开发文档更偏向于推荐我们将jetty内嵌到我们的项目中，最为一个可插拔的组件进行开发。

下面直接上代码：

POM文件

<properties>

        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

        <java.version>1.8</java.version>

        <jetty.version>9.4.8.v20171121</jetty.version>

        <spring.version>4.0.6.RELEASE</spring.version>

        <mybatis.version>3.3.0</mybatis.version>

        <mysql.version>5.1.24</mysql.version>

        <slf4j.version>1.7.25</slf4j.version>

        <logback.version>1.2.3</logback.version>

    </properties>

    <dependencies>

        <dependency>

            <groupId>junit</groupId>

            <artifactId>junit</artifactId>

            <version>4.11</version>

            <scope>test</scope>

        </dependency>

        <dependency>

            <groupId>org.eclipse.jetty</groupId>

            <artifactId>jetty-server</artifactId>

            <version>${jetty.version}</version>

        </dependency>

        <dependency>

            <groupId>org.eclipse.jetty</groupId>

            <artifactId>jetty-webapp</artifactId>

            <version>${jetty.version}</version>

        </dependency>

        <dependency>

            <groupId>org.eclipse.jetty</groupId>

            <artifactId>jetty-security</artifactId>

            <version>${jetty.version}</version>

        </dependency>

        <dependency>

            <groupId>org.eclipse.jetty</groupId>

            <artifactId>jetty-start</artifactId>

            <version>${jetty.version}</version>

        </dependency>

        <!-- 添加Spring依赖 -->

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-core</artifactId>

            <version>${spring.version}</version>

        </dependency>

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-context</artifactId>

            <version>${spring.version}</version>

        </dependency>

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-context-support</artifactId>

            <version>${spring.version}</version>

        </dependency>

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-aop</artifactId>

            <version>${spring.version}</version>

        </dependency>

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-aspects</artifactId>

            <version>${spring.version}</version>

        </dependency>

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-tx</artifactId>

            <version>${spring.version}</version>

        </dependency>

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-jdbc</artifactId>

            <version>${spring.version}</version>

        </dependency>

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-web</artifactId>

            <version>${spring.version}</version>

        </dependency>

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-webmvc</artifactId>

            <version>${spring.version}</version>

        </dependency>

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-beans</artifactId>

            <version>${spring.version}</version>

        </dependency>

        <!-- Spring AOP需要 aspectj Jar -->

        <dependency>

            <groupId>org.aspectj</groupId>

            <artifactId>aspectjrt</artifactId>

            <version>1.8.0</version>

        </dependency>

        <dependency>

            <groupId>org.aspectj</groupId>

            <artifactId>aspectjweaver</artifactId>

            <version>1.8.0</version>

        </dependency>

        <!-- Jackson -->

        <dependency>

            <groupId>com.fasterxml.jackson.core</groupId>

            <artifactId>jackson-core</artifactId>

            <version>2.8.8</version>

        </dependency>

        <dependency>

            <groupId>com.fasterxml.jackson.core</groupId>

            <artifactId>jackson-databind</artifactId>

            <version>2.8.8</version>

        </dependency>

        <!-- mysql驱动包 -->

        <dependency>

            <groupId>mysql</groupId>

            <artifactId>mysql-connector-java</artifactId>

            <version>${mysql.version}</version>

        </dependency>

        <!-- c3p0 -->

        <dependency>

            <groupId>c3p0</groupId>

            <artifactId>c3p0</artifactId>

            <version>0.9.1.2</version>

        </dependency>

        <!--mybatis依赖 -->

        <dependency>

            <groupId>org.mybatis</groupId>

            <artifactId>mybatis</artifactId>

            <version>${mybatis.version}</version>

        </dependency>

        <!-- mybatis/spring包 -->

        <dependency>

            <groupId>org.mybatis</groupId>

            <artifactId>mybatis-spring</artifactId>

            <version>1.2.1</version>

        </dependency>

        <!-- 添加servlet3.0核心包 -->

        <dependency>

            <groupId>javax.servlet</groupId>

            <artifactId>javax.servlet-api</artifactId>

            <version>3.1.0</version>

        </dependency>

        <dependency>

            <groupId>javax.servlet.jsp</groupId>

            <artifactId>javax.servlet.jsp-api</artifactId>

            <version>2.3.2-b01</version>

        </dependency>

        <!-- log日志 start -->

        <dependency>

            <groupId>org.slf4j</groupId>

            <artifactId>slf4j-api</artifactId>

            <version>${slf4j.version}</version>

        </dependency>

        <dependency>

            <groupId>ch.qos.logback</groupId>

            <artifactId>logback-core</artifactId>

            <version>${logback.version}</version>

        </dependency>

        <dependency>

            <groupId>ch.qos.logback</groupId>

            <artifactId>logback-classic</artifactId>

            <version>${logback.version}</version>

        </dependency>

        <!-- log日志 end -->

        <!--fileupload -->

        <dependency>

            <groupId>commons-fileupload</groupId>

            <artifactId>commons-fileupload</artifactId>

            <version>1.3.1</version>

        </dependency>

        <!-- jstl -->

        <dependency>

            <groupId>javax.servlet</groupId>

            <artifactId>jstl</artifactId>

            <version>1.2</version>

        </dependency>

    </dependencies>

    <build>

       <finalName>jetty-demo</finalName>

       <sourceDirectory>src/main/java</sourceDirectory>

       <outputDirectory>${project.build.directory}/classes</outputDirectory>

       <resources>

            <resource>
　　　　　　　　　 <!-- 将resources中的文件放进打的jar包中 -->

                <directory>src/main/resources</directory>

            </resource>

            <resource>
　　　　　　　　　 <!-- 将src/main/webapp下的文件放到打的jar包外 -->

                <directory>src/main/webapp</directory>

                <targetPath>${project.build.directory}/webapp/</targetPath>

            </resource>

        </resources>

        <plugins>

            <!-- 编译时跳过单元测试 -->

            <plugin>

                <groupId>org.apache.maven.plugins</groupId>

                <artifactId>maven-surefire-plugin</artifactId>

                <version>2.9</version>

                <configuration>

                    <skip>true</skip>

                </configuration>

            </plugin>

            <plugin>

                <groupId>org.apache.maven.plugins</groupId>

                <artifactId>maven-compiler-plugin</artifactId>

                <configuration>

                    <defaultLibBundleDir>lib</defaultLibBundleDir>

                    <source>${java.version}</source>

                    <target>${java.version}</target>

                    <encoding>${project.build.sourceEncoding}</encoding>

                </configuration>

            </plugin>

            <plugin>

                <groupId>org.apache.maven.plugins</groupId>

                <artifactId>maven-jar-plugin</artifactId>

                <configuration>

                    <archive>

                        <manifest>

                            <addClasspath>true</addClasspath>

                            <classpathPrefix>lib</classpathPrefix>

                            <mainClass>com.test.JettyServer</mainClass>

                        </manifest>

                    </archive>

                </configuration>

            </plugin>

            <!-- 拷贝依赖的jar包到lib目录 -->

            <plugin>

                <groupId>org.apache.maven.plugins</groupId>

                <artifactId>maven-dependency-plugin</artifactId>

                <executions>

                    <execution>

                        <id>copy-dependencies</id>

                        <phase>prepare-package</phase>

                        <goals>

                            <goal>copy-dependencies</goal>

                        </goals>

                        <configuration>

                            <outputDirectory>${project.build.directory}/lib</outputDirectory>

                            <overWriteReleases>false</overWriteReleases>

                            <overWriteSnapshots>true</overWriteSnapshots>

                            <overWriteIfNewer>true</overWriteIfNewer>

                        </configuration>

                    </execution>

                </executions>

            </plugin>

            <!-- 要将源码放上去，需要加入这个插件 -->

            <plugin>

                <artifactId>maven-source-plugin</artifactId>

                <version>2.1</version>

                <configuration>

                    <attach>true</attach>

                </configuration>

                <executions>

                    <execution>

                        <phase>compile</phase>

                        <goals>

                            <goal>jar</goal>

                        </goals>

                    </execution>

                </executions>

            </plugin>

        </plugins>

    </build>

web.xml

<!-- 设置编码格式 -->

    <filter>

        <filter-name>encodingFilter</filter-name>

        <filter-class>org.springframework.web.filter.CharacterEncodingFilter

        </filter-class>

        <init-param>

            <param-name>encoding</param-name>

            <param-value>UTF-8</param-value>

        </init-param>

        <init-param>

            <param-name>forceEncoding</param-name>

            <param-value>true</param-value>

        </init-param>

    </filter>

    <filter-mapping>

        <filter-name>encodingFilter</filter-name>

        <url-pattern>/*</url-pattern>

    </filter-mapping>

    <!-- spring mvc servlet-->

    <servlet>

        <servlet-name>restfulServlet</servlet-name>

        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

        <init-param>

            <param-name>contextConfigLocation</param-name>

            <param-value>classpath:/springMVC.xml</param-value>

        </init-param>

        <init-param>

            <param-name>useFileMappedBuffer</param-name>

            <param-value>false</param-value>

        </init-param>

        <load-on-startup>1</load-on-startup>

    </servlet>

    <servlet-mapping>

        <servlet-name>restfulServlet</servlet-name>

        <url-pattern>*.json</url-pattern>

    </servlet-mapping>

    <welcome-file-list>

        <welcome-file>index.html</welcome-file>

    </welcome-file-list>

    <!-- Session 超时 -->

    <session-config>

        <session-timeout>30</session-timeout>

    </session-config>

springMVC配置文件，就是普通的配置

　　<context:component-scan base-package="com.test" />

    <!--

         <mvc:default-servlet-handler/>

         将在 SpringMVC 上下文中定义一个 DefaultServletHttpRequestHandler，

         它会对进入 DispatcherServlet 的 请求进行筛查，如果发现是没有经过映射的请求，

         就将该请求交由 WEB 应用服务器默认的 Servlet 处理，如果不是静态资源的请求，才由 DispatcherServlet 继续处理

      -->

    <mvc:default-servlet-handler/>

    <!-- 让注解重新启动  @RequestMapping-->

    <mvc:annotation-driven />

    <bean id="mappingJackson2HttpMessageConverter" class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">

        <property name="supportedMediaTypes">

            <list>

                <value>application/json;charset=UTF-8</value>

                <value>text/javascript;charset=UTF-8</value>

                <value>text/plain;charset=UTF-8</value>

            </list>

        </property>

    </bean>

    <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">

        <property name="messageConverters">

            <list>

                <ref bean="mappingJackson2HttpMessageConverter" />

            </list>

        </property>

    </bean>

    <bean name="down" class="org.springframework.web.servlet.mvc.ParameterizableViewController">

        <property name="viewName" value="down"/>

    </bean>

    <!-- 配置视图解析器 -->

    <bean

        class="org.springframework.web.servlet.view.InternalResourceViewResolver">

        <property name="prefix" value="" />

        <property name="suffix" value=".jsp" /><!--可为空,方便实现自已的依据扩展名来选择视图解释类的逻辑 -->

        <!-- <property name="viewClass"

            value="org.springframework.web.servlet.view.JstlView" /> -->

    </bean>

    <!-- 处理文件上传 -->

    <bean id="multipartResolver"

          class="org.springframework.web.multipart.commons.CommonsMultipartResolver">

        <property name="defaultEncoding" value="UTF-8" /> <!-- 编码 -->

        <property name="maxInMemorySize" value="10240" /> <!-- 上传时占用最大内存大小 (10240) -->

        <property name="maxUploadSize" value="-1" /> <!-- 最大文件大小，-1为无限止(-1) -->

    </bean>

</beans>

springIOC容器配置文件

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"

    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xmlns:aop="http://www.springframework.org/schema/aop"

    xmlns:tx="http://www.springframework.org/schema/tx"

    xmlns:context="http://www.springframework.org/schema/context"

    xmlns:mvc="http://www.springframework.org/schema/mvc"

    xsi:schemaLocation="http://www.springframework.org/schema/beans

        http://www.springframework.org/schema/beans/spring-beans-3.2.xsd

           http://www.springframework.org/schema/aop

           http://www.springframework.org/schema/aop/spring-aop-3.2.xsd

           http://www.springframework.org/schema/tx

           http://www.springframework.org/schema/tx/spring-tx-3.2.xsd

           http://www.springframework.org/schema/context

           http://www.springframework.org/schema/context/spring-context-3.2.xsd

        http://www.springframework.org/schema/mvc

        http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd ">

    <context:component-scan base-package="com.test" />

</beans>

这里没有将springIOC容器配置和springMVC配置文件放在一起，也没有在springMVC配置文件中引用springIOC配置文件，主要是实现解耦分离

创建JettyServer

package com.test;

import java.io.File;

import java.net.URISyntaxException;

import java.net.URL;

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.webapp.WebAppContext;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.springframework.context.support.AbstractXmlApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import org.springframework.web.context.WebApplicationContext;

import org.springframework.web.context.support.XmlWebApplicationContext;

/**

 * jetty 服务器

 */

public class JettyServer {

    private static Logger logger = LoggerFactory.getLogger(JettyServer.class);

    private static final int HTTP_PORT = 8080;

    private static final int HTTPS_PORT = 8443;

    private static final String CONTEXT = "/";

    public static void main(String[] args) {

        Server server = new JettyServer().createServer();

        try {

            server.start();

            logger.info("jetty服务开启！！！");

            server.join();

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

    private JettyServer() {}

    private Server createServer() {

        // jetty server 默认的最小连接线程是8，最大是200，连接线程最大闲置时间60秒

        Server server = new Server();

        HttpConfiguration httpConfig = new HttpConfiguration();

        httpConfig.setSecureScheme("https");

        httpConfig.setSecurePort(HTTPS_PORT);

        httpConfig.setOutputBufferSize(32768);

        httpConfig.setRequestHeaderSize(8192);

        httpConfig.setResponseHeaderSize(8192);

        httpConfig.setSendServerVersion(true);

        httpConfig.setSendDateHeader(false);

        httpConfig.setHeaderCacheSize(512);

        ConnectionFactory connectionFactory = new HttpConnectionFactory(httpConfig);

        ServerConnector connector = new ServerConnector(server, connectionFactory);

        connector.setPort(HTTP_PORT);

        connector.setSoLingerTime(-1);

        // 连接线程最大空闲时间

        connector.setIdleTimeout(30000);

        server.addConnector(connector);

        URL url = JettyServer.class.getProtectionDomain().getCodeSource().getLocation();

        String path = "";

        try {

            path = new File(url.toURI()).getParent();

        } catch (URISyntaxException e) {

        }/*

         * 如果将项目的配置文件打包到jar包外，可以使用FileSystemXmlApplicationContext加载

         * AbstractXmlApplicationContext applicationContext = new FileSystemXmlApplicationContext(path+ "/webapp/WEB-INF/springConfig/applicationContext.xml");

         */

        // 如果在springMVC配置文件中，引入了springIOC配置文件applicationContext.xml,在这里就没有必要再创建applicationContext并将其放入到webApplicationContext中

        // 这里使用ClassPathXmlApplicationContext的原因是在打包后，打包的jar文件目录其实是classpath目录，不会出现文件找不到

        AbstractXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("classpath:applicationContext.xml");

        WebAppContext webAppContext = new WebAppContext();

        /*

         * contextPath 是URL的前缀。例如一个contextPath 是/foo，它将处理 /foo， /foo/index.html， /foo/bar/，and /foo/bar/image.png等请求，

         * 但是它不会处理像/，/other/，or /favicon.ico这样的请求

         */

        webAppContext.setContextPath(CONTEXT);

        webAppContext.setDescriptor(path+"/webapp/WEB-INF/web.xml");

        // 配置资源，这个配置是一个目录，包含各种静态资源信息，可以是图片或者HTML页面。

        webAppContext.setResourceBase(path+"/webapp");

        // 配置监听主机ip或名称，没有配置的将不会被监听到。

        //webAppContext.setVirtualHosts(new String[] {});

        webAppContext.setConfigurationDiscovered(true);

        webAppContext.setParentLoaderPriority(true);

        webAppContext.setMaxFormContentSize(10 << 20);

        webAppContext.setClassLoader(Thread.currentThread().getContextClassLoader());

        XmlWebApplicationContext xmlWebAppContext = new XmlWebApplicationContext();

        xmlWebAppContext.setParent(applicationContext);

        xmlWebAppContext.setConfigLocation("");

        xmlWebAppContext.setServletContext(webAppContext.getServletContext());

        xmlWebAppContext.refresh();

        // 配置属性，可以传递到实体类中，比如javax.servlet.context.tempdir属性用来配置临时目录。

        webAppContext.setAttribute(

                WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE,

                xmlWebAppContext);

        server.setHandler(webAppContext);

        return server;

    }

}

其他别的配置就和普通的web项目配置一样。

注意：项目运行之前要先进行编译，不然会找不到启动类，项目进行编译或者打包后，在target中找到如图所示的文件

spring内嵌jetty容器，实现main方法启动web项目

jetty-demo.jar是打包好的可运行的jar，使用Java -jar 命令就可以运行；项目依赖的jar包在lib文件夹下；webapp文件存放的是项目的静态资源、html文件、JS文件，在学习中发现一个有趣的现象，我在webapp文件夹中放入一个新的html页面，不用将服务器进行重启就可以用浏览器访问，算是一个小的优点吧（运行中的项目改变前端页面后，直接将页面进行替换，不需要将项目进行重启）；jetty-demo-sources.jar放的是项目的源文件。

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