我想不使用Spring 3.1的任何XML配置和一个嵌入式码头8服务器上创建一个简单的Web应用程序。
不过,我挣扎着爬码头认识我的春节WebApplicationInitializer接口implementaton。
项目结构:
src
+- main
+- java
| +- JettyServer.java
| +- Initializer.java
|
+- webapp
+- web.xml (objective is to remove this - see below).
以上的初始化类是一个简单的实现WebApplicationInitializer的:
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import org.springframework.web.WebApplicationInitializer;
public class Initializer implements WebApplicationInitializer {
@Override
public void onStartup(ServletContext servletContext) throws ServletException {
System.out.println("onStartup");
}
}
同样JettyServer是一个简单的实现嵌入式Jetty服务器的:
import org.eclipse.jetty.annotations.AnnotationConfiguration;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.webapp.Configuration;
import org.eclipse.jetty.webapp.WebAppContext;
public class JettyServer {
public static void main(String[] args) throws Exception {
Server server = new Server(8080);
WebAppContext webAppContext = new WebAppContext();
webAppContext.setResourceBase("src/main/webapp");
webAppContext.setContextPath("/");
webAppContext.setConfigurations(new Configuration[] { new AnnotationConfiguration() });
webAppContext.setParentLoaderPriority(true);
server.setHandler(webAppContext);
server.start();
server.join();
}
}
我的理解是,在启动时将码头使用AnnotationConfiguration扫描ServletContainerInitializer的注解实现; 它应该找到初始化函数和电线它...
然而,当我启动Jetty服务器(从Eclipse)我看到在命令行:
2012-11-04 16:59:04.552:INFO:oejs.Server:jetty-8.1.7.v20120910
2012-11-04 16:59:05.046:INFO:/:No Spring WebApplicationInitializer types detected on classpath
2012-11-04 16:59:05.046:INFO:oejsh.ContextHandler:started o.e.j.w.WebAppContext{/,file:/Users/duncan/Coding/spring-mvc-embedded-jetty-test/src/main/webapp/}
2012-11-04 16:59:05.117:INFO:oejs.AbstractConnector:Started SelectChannelConnector@0.0.0.0:8080
最重要的一点是这样的:
No Spring WebApplicationInitializer types detected on classpath
注意,SRC /主/ JAVA被定义为在Eclipse源文件夹,所以应该是类路径上。 还要注意的是,动态Web模块方面是设置为3.0。
我敢肯定有一个简单的解释,但我挣扎,见树木不见森林! 我怀疑,关键是用下面一行:
...
webAppContext.setResourceBase("src/main/webapp");
...
这是有道理的使用web.xml中(见下文)2.5的servlet,但使用AnnotationConfiguration时什么应该是什么?
注:一切都正确触发,如果我改变配置为以下内容:
...
webAppContext.setConfigurations(new Configuration[] { new WebXmlConfiguration() });
...
在这种情况下它发现在src /主/应用中web.xml并使用它来接线以通常的方式(完全绕过上述WebApplicationInitializer实现)使用的DispatcherServlet和AnnotationConfigWebApplicationContext该servlet。
这感觉很像一个classpath的问题,但我努力理解与WebApplicationInitializer的实现赞同相当如何码头-任何建议将最赞赏!
对于信息,我使用的是以下几点:
春天3.1.1码头8.1.7 STS 3.1.0
Answer 1:
问题是,Jetty的AnnotationConfiguration
类不扫描在classpath非罐子资源(除WEB-INF / classes目录下)。
它发现我WebApplicationInitializer
的,如果我注册的子类AnnotationConfiguration
将覆盖configure(WebAppContext)
扫描主机类路径中,除了容器和WEB-INF位置。
大部分子类是(可惜)从父复制粘贴。 这包括:
- 一个额外的解析调用(
parseHostClassPath
在配置方法的端部); - 该
parseHostClassPath
方法,该方法在很大程度上复制粘贴从AnnotationConfiguration
的parseWebInfClasses
; - 该
getHostClassPathResource
方法,抓住从类加载器(其中,至少对我来说,是文件的URL到我在eclipse classpath中)第一个非罐子URL。
我使用略有不同的版本码头(8.1.7.v20120910)和春季(3.1.2_RELEASE)的,但我想同样的解决方案会奏效。
编辑:我创建了一个工作示例项目在GitHub上有一些修改(下面的代码工作正常,从食,但在阴影罐子不运行时) - https://github.com/steveliles/jetty-embedded-spring-mvc-noxml
在OP的JettyServer类的必要变化将替换为第15行:
webAppContext.setConfigurations (new Configuration []
{
new AnnotationConfiguration()
{
@Override
public void configure(WebAppContext context) throws Exception
{
boolean metadataComplete = context.getMetaData().isMetaDataComplete();
context.addDecorator(new AnnotationDecorator(context));
AnnotationParser parser = null;
if (!metadataComplete)
{
if (context.getServletContext().getEffectiveMajorVersion() >= 3 || context.isConfigurationDiscovered())
{
parser = createAnnotationParser();
parser.registerAnnotationHandler("javax.servlet.annotation.WebServlet", new WebServletAnnotationHandler(context));
parser.registerAnnotationHandler("javax.servlet.annotation.WebFilter", new WebFilterAnnotationHandler(context));
parser.registerAnnotationHandler("javax.servlet.annotation.WebListener", new WebListenerAnnotationHandler(context));
}
}
List<ServletContainerInitializer> nonExcludedInitializers = getNonExcludedInitializers(context);
parser = registerServletContainerInitializerAnnotationHandlers(context, parser, nonExcludedInitializers);
if (parser != null)
{
parseContainerPath(context, parser);
parseWebInfClasses(context, parser);
parseWebInfLib (context, parser);
parseHostClassPath(context, parser);
}
}
private void parseHostClassPath(final WebAppContext context, AnnotationParser parser) throws Exception
{
clearAnnotationList(parser.getAnnotationHandlers());
Resource resource = getHostClassPathResource(getClass().getClassLoader());
if (resource == null)
return;
parser.parse(resource, new ClassNameResolver()
{
public boolean isExcluded (String name)
{
if (context.isSystemClass(name)) return true;
if (context.isServerClass(name)) return false;
return false;
}
public boolean shouldOverride (String name)
{
//looking at webapp classpath, found already-parsed class of same name - did it come from system or duplicate in webapp?
if (context.isParentLoaderPriority())
return false;
return true;
}
});
//TODO - where to set the annotations discovered from WEB-INF/classes?
List<DiscoveredAnnotation> annotations = new ArrayList<DiscoveredAnnotation>();
gatherAnnotations(annotations, parser.getAnnotationHandlers());
context.getMetaData().addDiscoveredAnnotations (annotations);
}
private Resource getHostClassPathResource(ClassLoader loader) throws IOException
{
if (loader instanceof URLClassLoader)
{
URL[] urls = ((URLClassLoader)loader).getURLs();
for (URL url : urls)
if (url.getProtocol().startsWith("file"))
return Resource.newResource(url);
}
return null;
}
},
});
更新 :码头8.1.8引入了不兼容与上面的代码的内部变化。 对于8.1.8以下似乎工作:
webAppContext.setConfigurations (new Configuration []
{
// This is necessary because Jetty out-of-the-box does not scan
// the classpath of your project in Eclipse, so it doesn't find
// your WebAppInitializer.
new AnnotationConfiguration()
{
@Override
public void configure(WebAppContext context) throws Exception {
boolean metadataComplete = context.getMetaData().isMetaDataComplete();
context.addDecorator(new AnnotationDecorator(context));
//Even if metadata is complete, we still need to scan for ServletContainerInitializers - if there are any
AnnotationParser parser = null;
if (!metadataComplete)
{
//If metadata isn't complete, if this is a servlet 3 webapp or isConfigDiscovered is true, we need to search for annotations
if (context.getServletContext().getEffectiveMajorVersion() >= 3 || context.isConfigurationDiscovered())
{
_discoverableAnnotationHandlers.add(new WebServletAnnotationHandler(context));
_discoverableAnnotationHandlers.add(new WebFilterAnnotationHandler(context));
_discoverableAnnotationHandlers.add(new WebListenerAnnotationHandler(context));
}
}
//Regardless of metadata, if there are any ServletContainerInitializers with @HandlesTypes, then we need to scan all the
//classes so we can call their onStartup() methods correctly
createServletContainerInitializerAnnotationHandlers(context, getNonExcludedInitializers(context));
if (!_discoverableAnnotationHandlers.isEmpty() || _classInheritanceHandler != null || !_containerInitializerAnnotationHandlers.isEmpty())
{
parser = createAnnotationParser();
parse(context, parser);
for (DiscoverableAnnotationHandler h:_discoverableAnnotationHandlers)
context.getMetaData().addDiscoveredAnnotations(((AbstractDiscoverableAnnotationHandler)h).getAnnotationList());
}
}
private void parse(final WebAppContext context, AnnotationParser parser) throws Exception
{
List<Resource> _resources = getResources(getClass().getClassLoader());
for (Resource _resource : _resources)
{
if (_resource == null)
return;
parser.clearHandlers();
for (DiscoverableAnnotationHandler h:_discoverableAnnotationHandlers)
{
if (h instanceof AbstractDiscoverableAnnotationHandler)
((AbstractDiscoverableAnnotationHandler)h).setResource(null); //
}
parser.registerHandlers(_discoverableAnnotationHandlers);
parser.registerHandler(_classInheritanceHandler);
parser.registerHandlers(_containerInitializerAnnotationHandlers);
parser.parse(_resource,
new ClassNameResolver()
{
public boolean isExcluded (String name)
{
if (context.isSystemClass(name)) return true;
if (context.isServerClass(name)) return false;
return false;
}
public boolean shouldOverride (String name)
{
//looking at webapp classpath, found already-parsed class of same name - did it come from system or duplicate in webapp?
if (context.isParentLoaderPriority())
return false;
return true;
}
});
}
}
private List<Resource> getResources(ClassLoader aLoader) throws IOException
{
if (aLoader instanceof URLClassLoader)
{
List<Resource> _result = new ArrayList<Resource>();
URL[] _urls = ((URLClassLoader)aLoader).getURLs();
for (URL _url : _urls)
_result.add(Resource.newResource(_url));
return _result;
}
return Collections.emptyList();
}
}
});
Answer 2:
我能够明确地只提供给AnnotationConfiguration,我想加载这样的实现类(在这个例子中MyWebApplicationInitializerImpl)以一种轻松,更有限的方式来解决:
webAppContext.setConfigurations(new Configuration[] {
new WebXmlConfiguration(),
new AnnotationConfiguration() {
@Override
public void preConfigure(WebAppContext context) throws Exception {
MultiMap<String> map = new MultiMap<String>();
map.add(WebApplicationInitializer.class.getName(), MyWebApplicationInitializerImpl.class.getName());
context.setAttribute(CLASS_INHERITANCE_MAP, map);
_classInheritanceHandler = new ClassInheritanceHandler(map);
}
}
});
Answer 3:
码头9.0.1包含的增强,其允许对容器类路径非罐资源(即分类)的注释的扫描。 见注释#5以下问题如何使用它:
https://bugs.eclipse.org/bugs/show_bug.cgi?id=404176#c5
一月
Answer 4:
下面的代码的伎俩在我的Maven项目:
public static void main(String[] args) throws Exception {
Server server = new Server();
ServerConnector scc = new ServerConnector(server);
scc.setPort(Integer.parseInt(System.getProperty("jetty.port", "8080")));
server.setConnectors(new Connector[] { scc });
WebAppContext context = new WebAppContext();
context.setServer(server);
context.setContextPath("/");
context.setWar("src/main/webapp");
context.getMetaData().addContainerResource(new FileResource(new File("./target/classes").toURI()));
context.setConfigurations(new Configuration[]{
new WebXmlConfiguration(),
new AnnotationConfiguration()
});
server.setHandler(context);
try {
System.out.println(">>> STARTING EMBEDDED JETTY SERVER, PRESS ANY KEY TO STOP");
System.out.println(String.format(">>> open http://localhost:%s/", scc.getPort()));
server.start();
while (System.in.available() == 0) {
Thread.sleep(5000);
}
server.stop();
server.join();
} catch (Throwable t) {
t.printStackTrace();
System.exit(100);
}
}
Answer 5:
根据我的测试,这个线程http://forum.springsource.org/showthread.php?127152-WebApplicationInitializer-not-loaded-with-embedded-Jetty我不认为它工作的时刻。 如果您在AnnotationConfiguration.configure看看:
parseContainerPath(context, parser);
// snip comment
parseWebInfClasses(context, parser);
parseWebInfLib (context, parser);
似乎连接到类似战争的部署,而不是嵌入。
下面是使用Spring MVC和嵌入式码头,可能是更有用的例子:
http://www.jamesward.com/2012/08/13/containerless-spring-mvc
它创建春的servlet直接而不是依靠注解。
Answer 6:
对于那些经历这个最近,似乎这得到解决这个问题:
@Component
public class Initializer implements WebApplicationInitializer {
private ServletContext servletContext;
@Autowired
public WebInitializer(ServletContext servletContext) {
this.servletContext = servletContext;
}
@PostConstruct
public void onStartup() throws ServletException {
onStartup(servletContext);
}
public void onStartup(ServletContext servletContext) throws ServletException {
System.out.println("onStartup");
}
}
Answer 7:
为了使它在码头9组工作属性AnnotationConfiguration.CLASS_INHERITANCE_MAP上WebAppContext
webAppContext.setAttribute(AnnotationConfiguration.CLASS_INHERITANCE_MAP, createClassMap());
这里是如何创建此地图:
private ClassInheritanceMap createClassMap() {
ClassInheritanceMap classMap = new ClassInheritanceMap();
ConcurrentHashSet<String> impl = new ConcurrentHashSet<>();
impl.add(MyWebAppInitializer.class.getName());
classMap.put(WebApplicationInitializer.class.getName(), impl);
return classMap;
}
我放置在解决方案的GitHub
Answer 8:
怎么样只是设置上下文属性,告诉其事情上需要被扫描的容器类路径所属的扫描仪?
上下文属性:org.eclipse.jetty.server.webapp.ContainerIncludeJarPattern。 / servlet的API - [^ /]的.jar $
它的目的是用罐子名称中使用,但你可以很匹配的一切。
你需要使用WebInfConfiguration还有AnnotationConfiguration类。
欢呼声扬
Answer 9:
在我们的情况下,这些行帮助了码头的启动代码:
ClassList cl = Configuration.ClassList.setServerDefault(server);
cl.addBefore("org.eclipse.jetty.webapp.JettyWebXmlConfiguration", "org.eclipse.jetty.annotations.AnnotationConfiguration");
Answer 10:
码头9“magomarcelo”答案的版本:
context.setConfigurations(
new org.eclipse.jetty.webapp.Configuration[] { new WebXmlConfiguration(), new AnnotationConfiguration() {
@Override
public void preConfigure(WebAppContext context) throws Exception {
final ClassInheritanceMap map = new ClassInheritanceMap();
final ConcurrentHashSet<String> set = new ConcurrentHashSet<>();
set.add(MyWebAppInitializer.class.getName());
map.put(WebApplicationInitializer.class.getName(), set);
context.setAttribute(CLASS_INHERITANCE_MAP, map);
_classInheritanceHandler = new ClassInheritanceHandler(map);
}
} });
Answer 11:
对于码头9,如果你有webjars,所提供的解决方案不会为那些罐子需要在类路径和JAR内容需要可为你的web应用资源工作,立竿见影。 因此,对于与webjars一起工作,配置必须是:
context.setExtraClasspath(pathsToWebJarsCommaSeparated);
context.setAttribute(WebInfConfiguration.WEBINF_JAR_PATTERN, ".*\\.jar$");
context.setAttribute(WebInfConfiguration.CONTAINER_JAR_PATTERN, ".*\\.jar$");
context.setConfigurations(
new org.eclipse.jetty.webapp.Configuration[] {
new WebInfConfiguration(), new MetaInfConfiguration(),
new AnnotationConfiguration() {
@Override
public void preConfigure(WebAppContext context) throws Exception {
final ClassInheritanceMap map = new ClassInheritanceMap();
final ConcurrentHashSet<String> set = new ConcurrentHashSet<>();
set.add(MyWebAppInitializer.class.getName());
map.put(WebApplicationInitializer.class.getName(), set);
context.setAttribute(CLASS_INHERITANCE_MAP, map);
_classInheritanceHandler = new ClassInheritanceHandler(map);
}
} });
这里的顺序很重要(WebInfConfiguration有来MetaInf之前 )。
Answer 12:
这为我工作,不涉及扫描,但解决方案使用您提供WebApplicationInitializer类。 码头版本:9.2.20
public class Main {
public static void main(String... args) throws Exception {
Properties properties = new Properties();
InputStream stream = Main.class.getResourceAsStream("/WEB-INF/application.properties");
properties.load(stream);
stream.close();
PropertyConfigurator.configure(properties);
WebAppContext webAppContext = new WebAppContext();
webAppContext.setResourceBase("resource");
webAppContext.setContextPath(properties.getProperty("base.url"));
webAppContext.setConfigurations(new Configuration[] {
new WebXmlConfiguration(),
new AnnotationConfiguration() {
@Override
public void preConfigure(WebAppContext context) {
ClassInheritanceMap map = new ClassInheritanceMap();
map.put(WebApplicationInitializer.class.getName(), new ConcurrentHashSet<String>() {{
add(WebInitializer.class.getName());
add(SecurityWebInitializer.class.getName());
}});
context.setAttribute(CLASS_INHERITANCE_MAP, map);
_classInheritanceHandler = new ClassInheritanceHandler(map);
}
}
});
Server server = new Server(Integer.parseInt(properties.getProperty("base.port")));
server.setHandler(webAppContext);
server.start();
server.join();
}
}
此代码段的源代码(在俄罗斯)是在这里: https://habrahabr.ru/post/255773/
Answer 13:
做了一个简单的Maven项目来说明如何可以做到干净。
public class Console {
public static void main(String[] args) {
try {
Server server = new Server(8080);
//Set a handler to handle requests.
server.setHandler(getWebAppContext());
//starts to listen at 0.0.0.0:8080
server.start();
server.join();
} catch (Exception e) {
log.error("server exited with exception", e);
}
}
private static WebAppContext getWebAppContext() {
final WebAppContext webAppContext = new WebAppContext();
//route all requests via this web-app.
webAppContext.setContextPath("/");
/*
* point to location where the jar into which this class gets packaged into resides.
* this could very well be the target directory in a maven development build.
*/
webAppContext.setResourceBase("directory_where_the_application_jar_exists");
//no web inf for us - so let the scanning know about location of our libraries / classes.
webAppContext.getMetaData().setWebInfClassesDirs(Arrays.asList(webAppContext.getBaseResource()));
//Scan for annotations (servlet 3+)
final AnnotationConfiguration configuration = new AnnotationConfiguration();
webAppContext.setConfigurations(new Configuration[]{configuration});
return webAppContext;
}
}
而这一切 - 您所使用的弹簧WebApplicationInitializer将得到不明确让码头服务器知道这样的应用程序初始化的存在检测。
文章来源: Spring 3.1 WebApplicationInitializer & Embedded Jetty 8 AnnotationConfiguration