我试图用我的Web应用程序生成一个战争以及一个带有嵌入式jetty的自包含jar文件.对于嵌入式jetty(jar文件分发),我添加一个servlet,如下所示:
public static void main(String[] args) throws Exception { Server server = new Server(8080); ServletContextHandler context = new ServletContextHandler(ServletContextHandler.SESSIONS); context.setContextPath("/"); server.setHandler(context); context.addServlet(new ServletHolder(new HelloServlet()),"/*"); server.start(); server.join(); }
war文件分发使用web.xml文件,该文件在web-app部分中包含以下内容:
com.example.HelloServlet SimplestServer HelloServlet /*
这有效.但是,我想摆脱两种方法之间的重复.即,当我添加一个新的servlet时,我想要只在一个位置配置它.我可以从嵌入式jetty加载和使用web.xml文件吗?
用一个 org.eclipse.jetty.webapp.WebAppContext
例:
package jetty;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.webapp.WebAppContext;
public class OnWebApp
{
public static void main(String[] args) throws Exception
{
// Create a basic jetty server object that will listen on port 8080.
// Note that if you set this to port 0 then a randomly available port
// will be assigned that you can either look in the logs for the port,
// or programmatically obtain it for use in test cases.
Server server = new Server(8080);
// The WebAppContext is the entity that controls the environment in
// which a web application lives and breathes. In this example the
// context path is being set to "/" so it is suitable for serving
// root context requests and then we see it setting the location of
// the war. A whole host of other configurations are available,
// ranging from configuring to support annotation scanning in the
// webapp (through PlusConfiguration) to choosing where the webapp
// will unpack itself.
WebAppContext webapp = new WebAppContext();
webapp.setContextPath("/");
webapp.setWar("path/to/my/test.war");
// A WebAppContext is a ContextHandler as well so it needs to be set to
// the server so it is aware of where to send the appropriate requests.
server.setHandler(webapp);
// Start things up! By using the server.join() the server thread will
// join with the current thread.
// See http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Thread.html#join()
// for more details.
server.start();
server.join();
}
}
请注意,您将构建一个普通的WAR文件,并将其与Jetty一起使用.
如果您有特殊要求,例如Annotation扫描或JNDI,那么您需要进入配置规范.
// Enable parsing of jndi-related parts of web.xml and jetty-env.xml
org.eclipse.jetty.webapp.Configuration.ClassList classlist =
org.eclipse.jetty.webapp.Configuration.ClassList.setServerDefault(server);
// Enable JNDI
classlist.addAfter("org.eclipse.jetty.webapp.FragmentConfiguration",
"org.eclipse.jetty.plus.webapp.EnvConfiguration",
"org.eclipse.jetty.plus.webapp.PlusConfiguration");
// Enable Annotation Scanning
classlist.addBefore("org.eclipse.jetty.webapp.JettyWebXmlConfiguration",
"org.eclipse.jetty.annotations.AnnotationConfiguration");
有关WebAppContext中较长的示例,请参阅ServerWithAnnotations示例.
另请注意,您将使用此技术制定所有webapp类加载器规则.这意味着您将拥有webapp的类加载器和服务器的另一个类加载器.这一点很重要.
您可以对WebAppContext进行类加载器的一些调整,但是您无法消除它们,只是控制它们的行为方式.
WebAppContext webapp = new WebAppContext();
// ... various setup of the webapp ...
// Flip the classloader priority from servlet spec where webapp is first to
// Standard java behavior of parent (aka Server classloader) is first.
webapp.setParentLoaderPriority(true);
也可以看看:
WebAppContext.setClassLoader(ClassLoader classloader)
WebAppContext.addServerClass(String classOrPackage)
WebAppContext.addSystemClass(String classOrPackage)
我最终使用了Joakim的方法,但指向webapp目录而不是war文件.
public static void main(String[] args) throws Exception { Server server = new Server(8080); String rootPath = SimplestServer.class.getClassLoader().getResource(".").toString(); WebAppContext webapp = new WebAppContext(rootPath + "../../src/main/webapp", ""); server.setHandler(webapp); server.start(); server.join(); }