深入Spring Boot实现对Fat Jar jsp的支持

/**
 * Add main class fat jar/exploded directory into tomcat ResourceSet.
 *
 * @author hengyunabc 2017-07-29
 *
 */
public class StaticResourceConfigurer implements LifecycleListener {

 private final Context context;

 StaticResourceConfigurer(Context context) {
  this.context = context;
 }

 @Override
 public void lifecycleEvent(LifecycleEvent event) {
  if (event.getType().equals(Lifecycle.CONFIGURE_START_EVENT)) {
   URL location = this.getClass().getProtectionDomain().getCodeSource().getLocation();

   if (ResourceUtils.isFileURL(location)) {
    // when run as exploded directory
    String rootFile = location.getFile();
    if (rootFile.endsWith("/BOOT-INF/classes/")) {
     rootFile = rootFile.substring(0, rootFile.length() - "/BOOT-INF/classes/".length() + 1);
    }
    if (!new File(rootFile, "META-INF" + File.separator + "resources").isDirectory()) {
     return;
    }

    try {
     location = new File(rootFile).toURI().toURL();
    } catch (MalformedURLException e) {
     throw new IllegalStateException("Can not add tomcat resources", e);
    }
   }

   String locationStr = location.toString();
   if (locationStr.endsWith("/BOOT-INF/classes!/")) {
    // when run as fat jar
    locationStr = locationStr.substring(0, locationStr.length() - "/BOOT-INF/classes!/".length() + 1);
    try {
     location = new URL(locationStr);
    } catch (MalformedURLException e) {
     throw new IllegalStateException("Can not add tomcat resources", e);
    }
   }
   this.context.getResources().createWebResourceSet(ResourceSetType.RESOURCE_JAR, "/", location,
     "/META-INF/resources");

  }
 }
}

@Configuration
@ConditionalOnProperty(name = "tomcat.staticResourceCustomizer.enabled", matchIfMissing = true)
public class TomcatConfiguration {
 @Bean
 public EmbeddedServletContainerCustomizer staticResourceCustomizer() {
  return new EmbeddedServletContainerCustomizer() {
   @Override
   public void customize(ConfigurableEmbeddedServletContainer container) {
    if (container instanceof TomcatEmbeddedServletContainerFactory) {
     ((TomcatEmbeddedServletContainerFactory) container)
       .addContextCustomizers(new TomcatContextCustomizer() {
        @Override
        public void customize(Context context) {
         context.addLifecycleListener(new StaticResourceConfigurer(context));
        }
       });
    }
   }

  };
 }
}