springbootjar的启动原理解析

xxxx.jar
xxx.jar.original

.
├── BOOT-INF
│ ├── classes
│ │ ├── application-dev.properties
│ │ ├── application-prod.properties
│ │ ├── application.properties
│ │ ├── com
│ │ │ └── weibangong
│ │ │  └── open
│ │ │   └── openapi
│ │ │    ├── SpringBootWebApplication.class
│ │ │    ├── config
│ │ │    │ ├── ProxyServletConfiguration.class
│ │ │    │ └── SwaggerConfig.class
│ │ │    ├── oauth2
│ │ │    │ ├── controller
│ │ │    │ │ ├── AccessTokenController.class
│ │ ├── logback-spring.xml
│ │ └── static
│ │  ├── css
│ │  │ └── guru.css
│ │  ├── images
│ │  │ ├── FBcover1200x628.png
│ │  │ └── NewBannerBOOTS_2.png
│ └── lib
│  ├── accessors-smart-1.1.jar
├── META-INF
│ ├── MANIFEST.MF
│ └── maven
│  └── com.weibangong.open
│   └── open-server-openapi
│    ├── pom.properties
│    └── pom.xml
└── org
 └── springframework
  └── boot
   └── loader
    ├── ExecutableArchiveLauncher$1.class
    ├── ExecutableArchiveLauncher.class
    ├── JarLauncher.class
    ├── LaunchedURLClassLoader$1.class
    ├── LaunchedURLClassLoader.class
    ├── Launcher.class
    ├── archive
    │ ├── Archive$Entry.class
    │ ├── Archive$EntryFilter.class
    │ ├── Archive.class
    │ ├── ExplodedArchive$1.class
    │ ├── ExplodedArchive$FileEntry.class
    │ ├── ExplodedArchive$FileEntryIterator$EntryComparator.class
     ├── ExplodedArchive$FileEntryIterator.class

Manifest-Version: 1.0
Implementation-Title: open :: server :: openapi
Implementation-Version: 1.0-SNAPSHOT
Archiver-Version: Plexus Archiver
Built-By: xiaxuan
Implementation-Vendor-Id: com.weibangong.open
Spring-Boot-Version: 1.4.1.RELEASE
Implementation-Vendor: Pivotal Software, Inc.
Main-Class: org.springframework.boot.loader.PropertiesLauncher
Start-Class: com.weibangong.open.openapi.SpringBootWebApplication
Spring-Boot-Classes: BOOT-INF/classes/
Spring-Boot-Lib: BOOT-INF/lib/
Created-By: Apache Maven 3.3.9
Build-Jdk: 1.8.0_20
Implementation-URL: http://maven.apache.org/open-server-openapi

public static void main(String[] args) throws Exception {
  PropertiesLauncher launcher = new PropertiesLauncher();
  args = launcher.getArgs(args);
  launcher.launch(args);
}

 protected void launch(String[] args, String mainClass, ClassLoader classLoader) throws Exception {
  Thread.currentThread().setContextClassLoader(classLoader);
  this.createMainMethodRunner(mainClass, args, classLoader).run();
 }
 protected MainMethodRunner createMainMethodRunner(String mainClass, String[] args, ClassLoader classLoader) {
  return new MainMethodRunner(mainClass, args);
 }

package org.springframework.boot.loader;
import java.lang.reflect.Method;
public class MainMethodRunner {
 private final String mainClassName;
 private final String[] args;
 public MainMethodRunner(String mainClass, String[] args) {
  this.mainClassName = mainClass;
  this.args = args == null&＃63;null:(String[])args.clone();
 }
 public void run() throws Exception {
  Class mainClass = Thread.currentThread().getContextClassLoader().loadClass(this.mainClassName);
  Method mainMethod = mainClass.getDeclaredMethod("main", new Class[]{String[].class});
  mainMethod.invoke((Object)null, new Object[]{this.args});
 }
}

package cn.com.devh;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.netflix.feign.EnableFeignClients;
/**
 * Created by xiaxuan on 17/8/25.
 */
@SpringBootApplication
@EnableFeignClients
@EnableEurekaClient
public class A1ServiceApplication {
 public static void main(String[] args) {
  SpringApplication.run(A1ServiceApplication.class, args);
 }
}

 /**
  * Static helper that can be used to run a {@link SpringApplication} from the
  * specified source using default settings.
  * @param source the source to load
  * @param args the application arguments (usually passed from a Java main method)
  * @return the running {@link ApplicationContext}
  */
 public static ConfigurableApplicationContext run(Object source, String... args) {
  return run(new Object[] { source }, args);
 }

 /**
  * Static helper that can be used to run a {@link SpringApplication} from the
  * specified sources using default settings and user supplied arguments.
  * @param sources the sources to load
  * @param args the application arguments (usually passed from a Java main method)
  * @return the running {@link ApplicationContext}
  */
 public static ConfigurableApplicationContext run(Object[] sources, String[] args) {
  return new SpringApplication(sources).run(args);
 }

 /**
  * Create a new {@link SpringApplication} instance. The application context will load
  * beans from the specified sources (see {@link SpringApplication class-level}
  * documentation for details. The instance can be customized before calling
  * {@link #run(String...)}.
  * @param sources the bean sources
  * @see #run(Object, String[])
  * @see #SpringApplication(ResourceLoader, Object...)
  */
 public SpringApplication(Object... sources) {
  initialize(sources);
 }
 private void initialize(Object[] sources) {
  if (sources != null && sources.length > 0) {
   this.sources.addAll(Arrays.asList(sources));
  }
  this.webEnvirOnment= deduceWebEnvironment();
  setInitializers((Collection) getSpringFactoriesInstances(
    ApplicationContextInitializer.class));
  setListeners((Collection) getSpringFactoriesInstances(ApplicationListener.class));
  this.mainApplicatiOnClass= deduceMainApplicationClass();
 }

 private boolean deduceWebEnvironment() {
  for (String className : WEB_ENVIRONMENT_CLASSES) {
   if (!ClassUtils.isPresent(className, null)) {
    return false;
   }
  }
  return true;
 }

 private static final String[] WEB_ENVIRONMENT_CLASSES = { "javax.servlet.Servlet",
   "org.springframework.web.context.ConfigurableWebApplicationContext" };

/**
  * Sets the {@link ApplicationContextInitializer} that will be applied to the Spring
  * {@link ApplicationContext}.
  * @param initializers the initializers to set
  */
 public void setInitializers(
   Collection<&＃63; extends ApplicationContextInitializer<&＃63;>> initializers) {
  this.initializers = new ArrayList>();
  this.initializers.addAll(initializers);
 }
setListeners((Collection) getSpringFactoriesInstances(ApplicationListener.class))**

/**
  * Run the Spring application, creating and refreshing a new
  * {@link ApplicationContext}.
  * @param args the application arguments (usually passed from a Java main method)
  * @return a running {@link ApplicationContext}
  */
 public ConfigurableApplicationContext run(String... args) {
  StopWatch stopWatch = new StopWatch();
  stopWatch.start();
  ConfigurableApplicationContext cOntext= null;
  configureHeadlessProperty();
  SpringApplicationRunListeners listeners = getRunListeners(args);
  listeners.started();
  try {
   ApplicationArguments applicatiOnArguments= new DefaultApplicationArguments(
     args);
   cOntext= createAndRefreshContext(listeners, applicationArguments);
   afterRefresh(context, applicationArguments);
   listeners.finished(context, null);
   stopWatch.stop();
   if (this.logStartupInfo) {
    new StartupInfoLogger(this.mainApplicationClass)
      .logStarted(getApplicationLog(), stopWatch);
   }
   return context;
  }
  catch (Throwable ex) {
   handleRunFailure(context, listeners, ex);
   throw new IllegalStateException(ex);
  }
 }

private ConfigurableApplicationContext createAndRefreshContext(
   SpringApplicationRunListeners listeners,
   ApplicationArguments applicationArguments) {
  ConfigurableApplicationContext context;
  // Create and configure the environment
  ConfigurableEnvironment envirOnment= getOrCreateEnvironment();
  configureEnvironment(environment, applicationArguments.getSourceArgs());
  listeners.environmentPrepared(environment);
  if (isWebEnvironment(environment) && !this.webEnvironment) {
   envirOnment= convertToStandardEnvironment(environment);
  }
  if (this.bannerMode != Banner.Mode.OFF) {
   printBanner(environment);
  }
  // Create, load, refresh and run the ApplicationContext
  cOntext= createApplicationContext();
  context.setEnvironment(environment);
  postProcessApplicationContext(context);
  applyInitializers(context);
  listeners.contextPrepared(context);
  if (this.logStartupInfo) {
   logStartupInfo(context.getParent() == null);
   logStartupProfileInfo(context);
  }
  // Add boot specific singleton beans
  context.getBeanFactory().registerSingleton("springApplicationArguments",
    applicationArguments);
  // Load the sources
  Set sources = getSources();
  Assert.notEmpty(sources, "Sources must not be empty");
  load(context, sources.toArray(new Object[sources.size()]));
  listeners.contextLoaded(context);
  // Refresh the context
  refresh(context);
  if (this.registerShutdownHook) {
   try {
    context.registerShutdownHook();
   }
   catch (AccessControlException ex) {
    // Not allowed in some environments.
   }
  }
  return context;
 }
// Create and configure the environment
  ConfigurableEnvironment envirOnment= getOrCreateEnvironment();
  configureEnvironment(environment, applicationArguments.getSourceArgs());

  if (this.bannerMode != Banner.Mode.OFF) {
   printBanner(environment);
  }

// Create, load, refresh and run the ApplicationContext
  cOntext= createApplicationContext();
return (ConfigurableApplicationContext) BeanUtils.instantiate(contextClass)

if (this.registerShutdownHook) {
   try {
    context.registerShutdownHook();
   }
   catch (AccessControlException ex) {
    // Not allowed in some environments.
   }
  }