Spring Boot Jetty

Spring Boot Jetty 提供了另一種選擇，可以取代 Tomcat 內嵌 Server ，Spring Boot 168 EP 6 增加了 Jetty 的相依套件，並排除 Tomcat 套件。

Table of Contents

前言

Jetty 是一個基於 Java 的網頁伺服器與 Servlet 容器，它的架構是基於 Handler 來實現的，擴展簡單，可以同時處理大量連接，而且長時間保持連接，適合於 Web 聊天應用等等。

檔案目錄

./
   +- build.gradle
       +- src
           +- main
               +- resources
               |   +- application.properties

Gradle

build.gradle

增加 Jetty ，排除 Tomcat 。
增加 JSTL。
增加 Servlet。

修改完後，點右鍵，Gradle -> Refresh Gradle Project 。

buildscript {
	group 'org.ruoxue.spring-boot-168'
	version = '0.0.1-SNAPSHOT'
	ext {
            springBootVersion = '2.1.7.RELEASE'
	}
}


configurations.all {
    exclude group: 'org.springframework.boot', module: 'spring-boot-starter-tomcat'
}

dependencies {
    implementation "org.springframework.boot:spring-boot-starter-jetty:${springBootVersion}"
    implementation 'org.eclipse.jetty:apache-jsp:9.4.14.v20181114'
    implementation 'javax.servlet:jstl:1.2'
    implementation 'javax.servlet:javax.servlet-api:3.1.0'
}

設定

application.properties

增加 Jetty 設定。

server.jetty.threads.acceptors=2
server.jetty.threads.max=500
server.jetty.threads.min=8
server.jetty.threads.selectors=4

測試

Application.main

在主程式點右鍵執行 Run As -> Java Application，查看 console，Server 已成功啟動，監聽 10000 port。

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.1.7.RELEASE)

2022-04-18 17:29:43.852  INFO 4176 --- [           main] org.ruoxue.spring_boot_168.Application   : Starting Application on cheng-pc with PID 4176 (D:\dev\gitlab\ruoxue\spring-boot-168\bin\main started by cheng in D:\dev\gitlab\ruoxue\spring-boot-168)
2022-04-18 17:29:43.854  INFO 4176 --- [           main] org.ruoxue.spring_boot_168.Application   : No active profile set, falling back to default profiles: default
[GC (Metadata GC Threshold)  141030K->16355K(1005056K), 0.0089991 secs]
[Full GC (Metadata GC Threshold)  16355K->15549K(1005056K), 0.0161446 secs]
2022-04-18 17:29:44.633  INFO 4176 --- [           main] o.s.b.w.e.j.JettyServletWebServerFactory : Server initialized with port: 10000
2022-04-18 17:29:44.635  INFO 4176 --- [           main] org.eclipse.jetty.server.Server          : jetty-9.4.19.v20190610; built: 2019-06-10T16:30:51.723Z; git: afcf563148970e98786327af5e07c261fda175d3; jvm 1.8.0_241-b07
2022-04-18 17:29:44.654  INFO 4176 --- [           main] o.e.j.s.h.ContextHandler.application     : Initializing Spring embedded WebApplicationContext
2022-04-18 17:29:44.655  INFO 4176 --- [           main] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 771 ms
2022-04-18 17:29:44.731  INFO 4176 --- [           main] org.eclipse.jetty.server.session         : DefaultSessionIdManager workerName=node0
2022-04-18 17:29:44.731  INFO 4176 --- [           main] org.eclipse.jetty.server.session         : No SessionScavenger set, using defaults
2022-04-18 17:29:44.732  INFO 4176 --- [           main] org.eclipse.jetty.server.session         : node0 Scavenging every 600000ms
2022-04-18 17:29:44.751  INFO 4176 --- [           main] o.e.j.s.h.ContextHandler.application     : Warning: No org.apache.tomcat.JarScanner set in ServletContext. Falling back to default JarScanner implementation.
2022-04-18 17:29:44.820  INFO 4176 --- [           main] org.apache.jasper.servlet.TldScanner     : At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
2022-04-18 17:29:44.824  INFO 4176 --- [           main] o.e.jetty.server.handler.ContextHandler  : Started o.s.b.w.e.j.JettyEmbeddedWebAppContext@7726e185{application,/,[file:///C:/Users/cheng/AppData/Local/Temp/jetty-docbase.5287730162695741817.10000/],AVAILABLE}
2022-04-18 17:29:44.824  INFO 4176 --- [           main] org.eclipse.jetty.server.Server          : Started @1550ms
2022-04-18 17:29:44.941  INFO 4176 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'applicationTaskExecutor'
2022-04-18 17:29:45.090  INFO 4176 --- [           main] o.e.j.s.h.ContextHandler.application     : Initializing Spring DispatcherServlet 'dispatcherServlet'
2022-04-18 17:29:45.091  INFO 4176 --- [           main] o.s.web.servlet.DispatcherServlet        : Initializing Servlet 'dispatcherServlet'
2022-04-18 17:29:45.094  INFO 4176 --- [           main] o.s.web.servlet.DispatcherServlet        : Completed initialization in 3 ms
2022-04-18 17:29:45.175  INFO 4176 --- [           main] o.e.jetty.server.AbstractConnector       : Started ServerConnector@305f031{HTTP/1.1,[http/1.1]}{0.0.0.0:10000}
2022-04-18 17:29:45.177  INFO 4176 --- [           main] o.s.b.web.embedded.jetty.JettyWebServer  : Jetty started on port(s) 10000 (http/1.1) with context path '/'
2022-04-18 17:29:45.179  INFO 4176 --- [           main] org.ruoxue.spring_boot_168.Application   : Started Application in 1.608 seconds (JVM running for 1.905)