java - WebServlet 注释正在使用，但 GAE 正在尝试查找 web.xml

Question

据我所知，如果我使用 WebServlet 注释，我应该不需要 web.xml。我正在尝试使用 gradle 的 Google App Engine Standard 本地服务器，但尝试查找 web.xml 失败。

C:\Projects\x\x\Research\testeng>gradle appengineRun
Mar 28, 2018 1:17:18 PM java.util.prefs.WindowsPreferences
WARNING: Could not open/create prefs root node Software\JavaSoft\Prefs at root 0x80000002. Windows RegCreateKeyEx(...) returned error code 5.
Mar 28, 2018 1:17:18 PM com.google.apphosting.utils.config.AbstractConfigXmlReader readConfigXml
SEVERE: Received exception processing C:\Projects\x\x\Research\testeng\build\exploded-testeng\WEB-INF\web.xml
com.google.apphosting.utils.config.AppEngineConfigException: Could not locate C:\Projects\x\x\Research\testeng\build\exploded-testeng\WEB-INF\web.xml

我做错了什么......？

我得到了 servlet 的 stub

@WebServlet("/TestServlet")
public class TestServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    }
}

我的 build.gradle 非常接近 Using Gradle and the App Engine Plugin 中使用的内容:

buildscript {    // Configuration for building
  repositories {
    jcenter()    // Bintray's repository - a fast Maven Central mirror & more
    mavenCentral()
  }
  dependencies {
    classpath 'com.google.cloud.tools:appengine-gradle-plugin:+'    // latest App Engine Gradle tasks
  }
}

repositories {   // repositories for Jar's you access in your code
  maven {
    url 'https://oss.sonatype.org/content/repositories/snapshots' // SNAPSHOT repository (if needed)
  }
  mavenCentral()
  jcenter()
}

apply plugin: 'java'                              // standard Java tasks
apply plugin: 'war'                               // standard Web Archive plugin
apply plugin: 'com.google.cloud.tools.appengine'  // App Engine tasks

sourceSets {
   // main.kotlin.srcDirs += "src/main/kotlin"
    main.java.srcDirs += "src/main/java"
}

dependencies {
  compile 'com.google.appengine:appengine-api-1.0-sdk:+'  // Latest App Engine Api's
  providedCompile 'javax.servlet:javax.servlet-api:3.1.0'

  compile 'jstl:jstl:1.2'

// Add your dependencies here.
//  compile 'com.google.cloud:google-cloud:+'   // Latest Cloud API's http://googlecloudplatform.github.io/google-cloud-java

  testCompile 'junit:junit:4.12'
  testCompile 'com.google.truth:truth:0.33'
  testCompile 'org.mockito:mockito-all:1.10.19'

  testCompile 'com.google.appengine:appengine-testing:+'
  testCompile 'com.google.appengine:appengine-api-stubs:+'
  testCompile 'com.google.appengine:appengine-tools-sdk:+'
}

// Always run unit tests
appengineDeploy.dependsOn test
appengineStage.dependsOn test

appengine {  // App Engine tasks configuration
  deploy {   // deploy configuration

  }
}

test {
  useJUnit()
  testLogging.showStandardStreams = true
  beforeTest { descriptor ->
     logger.lifecycle("test: " + descriptor + "  Running")
  }

  onOutput { descriptor, event ->
     logger.lifecycle("test: " + descriptor + ": " + event.message )
  }
  afterTest { descriptor, result ->
    logger.lifecycle("test: " + descriptor + ": " + result )
  }
}

group   = "com.testeng"        // Generated output GroupId
version = "1.0-SNAPSHOT"       // Version in generated output

sourceCompatibility = 1.8     // App Engine Flexible uses Java 8
targetCompatibility = 1.8     // App Engine Flexible uses Java 8

Answer 1

您需要 web.xml和 appengine-web.xml如果您在 Java 中使用 GAE 标准，因为它们用于描述您的应用程序的配置方式。

您可以查看文档，详细了解您的应用程序所需的配置设置。