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十二、Undertow使用

因为在开发过程中使用tomact运行过程中，每一次更改后启动的过程中启动时间大概要30s-60s左右，为了加速启动过程，我搜索了适配servlet的容器，找到了undertow这个容器，并成功适配。

1.underwot介绍

Undertow 是红帽公司开发的一款基于 NIO 的高性能 Web 嵌入式服务器

特点：

轻量级：它是一个 Web 服务器，但不像传统的 Web 服务器有容器概念，它由两个核心 Jar 包组成，加载一个 Web 应用可以小于 10MB 内存

Servlet3.1 支持：它提供了对 Servlet3.1 的支持

WebSocket 支持：对 Web Socket 完全支持，用以满足 Web 应用巨大数量的客户端

嵌套性：它不需要容器，只需通过 API 即可快速搭建 Web 服务器

2.添加依赖

在pom.xml的依赖中添加如下节点

<!-- https://mvnrepository.com/artifact/com.jfinal/jfinal-undertow -->
    <dependency>
      <groupId>com.jfinal</groupId>
      <artifactId>jfinal-undertow</artifactId>
      <version>3.3</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/com.jfinal/jfinal -->
    <dependency>
      <groupId>com.jfinal</groupId>
      <artifactId>jfinal</artifactId>
      <version>5.0.7</version>
    </dependency>

3.配置webbuilder

webbuilder相当于tomact的web.xml，我们只需要将web.xml文件翻译成对应的代码就行了

关键代码

    Consumer<WebBuilder> webBuilderConsumer = e -> { };


    protected void config(){
        WebBuilder wb = new WebBuilder(this);
        wb.addServlet("mvc", "org.springframework.web.servlet.DispatcherServlet")
                .addServletMapping("mvc","/")
                .addServletInitParam("mvc","contextConfigLocation","classpath:spring/spring-mvc.xml")
                .addInitParameter("contextConfigLocation","classpath:spring/spring.xml")
                .addListener("org.springframework.web.context.ContextLoaderListener")
                .addInitParameter("log4jConfigLocation","classpath:log4j.properties")
                .addFilter("Encoding","org.springframework.web.filter.CharacterEncodingFilter")
                .addFilterInitParam("Encoding","encoding","utf-8")
                .addFilterUrlMapping("Encoding","/*");

        webBuilder.accept(wb);
    }

4.继承UndertowServer

创建自定义类 Myserver，继承自 UndertowServer，在初始化方法中为一些变量赋值。

public class MyServer extends UndertowServer {

    protected MyServer(UndertowConfig undertowConfig) {
        super(undertowConfig);
    }



    protected void init() {

        super.builder = Undertow.builder();
        super.webBuilder = webBuilderConsumer;
        super.configUndertow();
        config();
    }
}

5.重写main方法

因为undertow会读取配置文件 undertow.txt,所以我们先准备undertow.txt配置文件

undertow.devMode=true
undertow.port=8080
undertow.host=0.0.0.0
undertow.contextPath=/
undertow.gzip.enable=true
undertow.gzip.level=5
undertow.gzip.minLength=1024
undertow.ioThreads=4

然后重写main方法

public static void main(String[] args) {
        new MyServer(new UndertowConfig(UndertowConfig.class)).start(); 
 }

6.全部代码

package org.gjs.undertow;

import com.jfinal.server.undertow.UndertowConfig;
import com.jfinal.server.undertow.UndertowServer;
import com.jfinal.server.undertow.WebBuilder;
import io.undertow.Undertow;
import java.util.function.Consumer;

public class MyServer extends UndertowServer {

    protected MyServer(UndertowConfig undertowConfig) {
        super(undertowConfig);
    }



    protected void init() {

        super.builder = Undertow.builder();
        super.webBuilder = webBuilderConsumer;
        super.configUndertow();
        config();
    }


    Consumer<WebBuilder> webBuilderConsumer = e -> {
    };
    protected void config(){
        WebBuilder wb = new WebBuilder(this);
        wb.addServlet("mvc", "org.springframework.web.servlet.DispatcherServlet")
                .addServletMapping("mvc","/")
                .addServletInitParam("mvc","contextConfigLocation","classpath:spring/spring-mvc.xml")
                .addInitParameter("contextConfigLocation","classpath:spring/spring.xml")
                .addListener("org.springframework.web.context.ContextLoaderListener")
                .addInitParameter("log4jConfigLocation","classpath:log4j.properties")
                .addFilter("Encoding","org.springframework.web.filter.CharacterEncodingFilter")
                .addFilterInitParam("Encoding","encoding","utf-8")
                .addFilterUrlMapping("Encoding","/*");

        webBuilder.accept(wb);
    }

    public static void main(String[] args) {
        new MyServer(new UndertowConfig(UndertowConfig.class)).start();
    }


}

运行测试

启动时间只需要7.2s,启动速度显著提升

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