尝试使用Spring Boot中的Jetty，并更改Jetty的配置
在Spring Boot中，可以选择在Tomcat、Jetty和Undertow之间使用内置容器。过去一直使用Tomcat，但是由于切换到Jetty似乎也很简单，所以我想试试看使用Jetty。
请参考以下网站
公式
https://docs.spring.io/spring-boot/docs/current/reference/html/howto-embedded-servlet-containers.html
在pom.xml文件中进行配置
在spring-boot-starter-web中，默认使用Tomcat作为容器。因此，首先排除Tomcat，然后添加Jetty。具体如下：
※Gradle的写法也可在官方文档中找到。
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<!-- Tomcatを除外 -->
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
</exclusion>
</exclusions>
</dependency>
<!-- Jettyを追加 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jetty</artifactId>
</dependency>
现在可以使用Jetty了。
试着启动Jetty。
让我们像以前一样启动Jetty并检查控制台日志。
2015-12-20 00:04:06.792 INFO 5840 --- [ main] com.example.SpringBootJettyApplication : Starting SpringBootJettyApplication on N-PC with PID 5840 (C:\Development\sts-bundle\workspace\spring-boot-jetty\target\classes started by N in C:\Development\sts-bundle\workspace\spring-boot-jetty)
～略～
2015-12-20 00:04:18.721 INFO 5840 --- [ main] .s.b.c.e.j.JettyEmbeddedServletContainer : Jetty started on port(s) 8080 (http/1.1)
2015-12-20 00:04:18.746 INFO 5840 --- [ main] com.example.SpringBootJettyApplication : Started SpringBootJettyApplication in 14.129 seconds (JVM running for 16.169)
通过端口8080（http/1.1），可以看出Jetty已经启动了。接下来我们将与Tomcat启动时间进行比较。以下是Tomcat启动时的控制台日志。
2015-12-19 23:58:52.347 INFO 9896 --- [ main] com.example.SpringBootJettyApplication : Starting SpringBootJettyApplication on N-PC with PID 9896 (C:\Development\sts-bundle\workspace\spring-boot-jetty\target\classes started by N in C:\Development\sts-bundle\workspace\spring-boot-jetty)
～略～
2015-12-19 23:59:09.642 INFO 9896 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)
2015-12-19 23:59:09.671 INFO 9896 --- [ main] com.example.SpringBootJettyApplication : Started SpringBootJettyApplication in 18.602 seconds (JVM running for 21.014)
Jetty使用了14.129秒。
Tomcat则需要18.602秒。
果然Jetty更快。
尝试更改Jetty的配置
在中国还可以通过application.properties（或YML）进行Jetty的配置更改，但也可以通过JettyEmbeddedServletContainerFactory和JettyServerCustomizer的代码来实现灵活的更改。
-
- JettyEmbeddedServletContainerFactory
http://docs.spring.io/spring-boot/docs/current/api/org/springframework/boot/context/embedded/jetty/JettyEmbeddedServletContainerFactory.html
JettyServerCustomizer
http://docs.spring.io/spring-boot/docs/current/api/org/springframework/boot/context/embedded/jetty/JettyServerCustomizer.html
我用以下的方式进行了尝试。
创建JettyServerCustomizer的实现类并重写customize方法。可以获取org.eclipse.jetty.server.Server。这个类是Connector和RequestHandler的集合类，用于配置服务器的基本设置。
package com.example.config;
import org.eclipse.jetty.server.Server;
import org.springframework.boot.context.embedded.jetty.JettyServerCustomizer;
import org.springframework.stereotype.Component;
@Component
public class JettyServerCustomizerImpl implements JettyServerCustomizer {
@Override
public void customize(Server server) {
System.out.println("JettyServer Customize!!");
server.setStopTimeout(100);
}
}
接下来，我们需要创建一个实现EmbeddedServletContainerCustomizer接口的类并重写customize方法。
我们可以获取到org.springframework.boot.context.embedded.ConfigurableEmbeddedServletContainer，它的实际类型是JettyEmbeddedServletContainerFactory。我们可以使用这个类来对容器进行设置。最后，我们可以将上述的JettyServerCustomizerImpl传递给addServerCustomizers方法，从而实现对整个服务器的自定义设置。
package com.example.config;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.context.embedded.ConfigurableEmbeddedServletContainer;
import org.springframework.boot.context.embedded.EmbeddedServletContainerCustomizer;
import org.springframework.boot.context.embedded.jetty.JettyEmbeddedServletContainerFactory;
import org.springframework.stereotype.Component;
@Component
public class JettyConfig implements EmbeddedServletContainerCustomizer {
@Autowired
JettyServerCustomizerImpl jettyServerCustomizerImpl;
@Override
public void customize(ConfigurableEmbeddedServletContainer container) {
System.out.println("JettyContainer Configuration!!");
container.setPort(8888);
((JettyEmbeddedServletContainerFactory) container).addServerCustomizers(jettyServerCustomizerImpl);
}
}
这些类在Jetty启动时运行，并作为容器设置的反映。以下是启动日志。从控制台输出可以看出，上述两个类在启动时被加载。
2015-12-20 20:45:04.504 INFO 9308 --- [ main] com.example.SpringBootJettyApplication : Starting SpringBootJettyApplication on N-PC with PID 9308 (C:\Development\sts-bundle\workspace\spring-boot-jetty\target\classes started by N in C:\Development\sts-bundle\workspace\spring-boot-jetty)
2015-12-20 20:45:04.507 INFO 9308 --- [ main] com.example.SpringBootJettyApplication : No active profile set, falling back to default profiles: default
2015-12-20 20:45:04.578 INFO 9308 --- [ main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@52e677af: startup date [Sun Dec 20 20:45:04 JST 2015]; root of context hierarchy
2015-12-20 20:45:05.766 INFO 9308 --- [ main] o.s.b.f.s.DefaultListableBeanFactory : Overriding bean definition for bean 'beanNameViewResolver' with a different definition: replacing [Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=org.springframework.boot.autoconfigure.web.ErrorMvcAutoConfiguration$WhitelabelErrorViewConfiguration; factoryMethodName=beanNameViewResolver; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [org/springframework/boot/autoconfigure/web/ErrorMvcAutoConfiguration$WhitelabelErrorViewConfiguration.class]] with [Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration$WebMvcAutoConfigurationAdapter; factoryMethodName=beanNameViewResolver; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [org/springframework/boot/autoconfigure/web/WebMvcAutoConfiguration$WebMvcAutoConfigurationAdapter.class]]
JettyContainer Configuration!!
2015-12-20 20:45:06.829 INFO 9308 --- [ main] e.j.JettyEmbeddedServletContainerFactory : Server initialized with port: 8888
JettyServer Customize!!
2015-12-20 20:45:06.832 INFO 9308 --- [ main] org.eclipse.jetty.server.Server : jetty-9.2.14.v20151106
2015-12-20 20:45:06.975 INFO 9308 --- [ main] application : Initializing Spring embedded WebApplicationContext
2015-12-20 20:45:06.975 INFO 9308 --- [ main] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 2400 ms
2015-12-20 20:45:07.626 INFO 9308 --- [ main] o.s.b.c.e.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/]
2015-12-20 20:45:07.629 INFO 9308 --- [ main] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2015-12-20 20:45:07.629 INFO 9308 --- [ main] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2015-12-20 20:45:07.629 INFO 9308 --- [ main] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2015-12-20 20:45:07.630 INFO 9308 --- [ main] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2015-12-20 20:45:07.902 INFO 9308 --- [ main] o.e.jetty.server.handler.ContextHandler : Started o.s.b.c.e.j.JettyEmbeddedWebAppContext@6bb7cce7{/,file:/C:/Users/N/AppData/Local/Temp/jetty-docbase.186998930257237945.8888/,AVAILABLE}
2015-12-20 20:45:07.903 INFO 9308 --- [ main] org.eclipse.jetty.server.Server : Started @5155ms
2015-12-20 20:45:08.201 INFO 9308 --- [ main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@52e677af: startup date [Sun Dec 20 20:45:04 JST 2015]; root of context hierarchy
2015-12-20 20:45:08.315 INFO 9308 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2015-12-20 20:45:08.317 INFO 9308 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
2015-12-20 20:45:08.594 INFO 9308 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2015-12-20 20:45:08.595 INFO 9308 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2015-12-20 20:45:08.643 INFO 9308 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2015-12-20 20:45:08.854 INFO 9308 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup
2015-12-20 20:45:08.879 INFO 9308 --- [ main] application : Initializing Spring FrameworkServlet 'dispatcherServlet'
2015-12-20 20:45:08.880 INFO 9308 --- [ main] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization started
2015-12-20 20:45:08.898 INFO 9308 --- [ main] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization completed in 18 ms
2015-12-20 20:45:08.926 INFO 9308 --- [ main] o.eclipse.jetty.server.ServerConnector : Started ServerConnector@7906578e{HTTP/1.1}{0.0.0.0:8888}
2015-12-20 20:45:08.930 INFO 9308 --- [ main] .s.b.c.e.j.JettyEmbeddedServletContainer : Jetty started on port(s) 8888 (http/1.1)
2015-12-20 20:45:08.936 INFO 9308 --- [ main] com.example.SpringBootJettyApplication : Started SpringBootJettyApplication in 5.441 seconds (JVM running for 6.189)
虽然有一些解释不太清楚的地方，但我能够按照这种方式进行设置。
