How-to: Embed Tomcat in a Standalone Java Application
In response to my post Is there a JSP powered Script Engine that runs outside servlet container at JavaLobby, Kess Kuip writes:
Why not embed Tomcat as a whole in your application? It is not that fat!
The source code in the Kess's EmbeddedTomcat.java attachment is here:
EmbeddedTomcat.java
package org.kku.tomcat;
import org.apache.catalina.*;
import org.apache.catalina.connector.*;
import org.apache.catalina.realm.*;
import org.apache.catalina.startup.*;
import org.apache.catalina.users.*;
public class EmbeddedTomcat
{
// Instance variables:
private String name;
private int portNumber;
private Embedded embedded;
private Engine baseEngine;
private Host baseHost;
private Connector httpConnector;
/** Creates a new instance of EmbeddedTomcat */
public EmbeddedTomcat(
String name,
int portNumber)
{
this.name = name;
this.portNumber = portNumber;
init();
}
private void init()
{
MemoryRealm realm;
Context context;
String baseEngineName;
String hostName;
embedded = new Embedded();
// set default logger and realm
/*
FileLogger fileLog = new FileLogger();
fileLog.setDirectory(".");
fileLog.setPrefix(name);
fileLog.setSuffix(".log");
fileLog.setTimestamp(true);
embedded.setLogger(fileLog);
*/
realm = new MemoryRealm();
embedded.setRealm(realm);
// create an Engine
baseEngine = embedded.createEngine();
// set Engine properties
baseEngineName = name + "Engine";
hostName = name + "Host";
baseEngine.setName(baseEngineName);
baseEngine.setDefaultHost(hostName);
baseHost = embedded.createHost(hostName, "webapps");
baseEngine.addChild(baseHost);
// RootContext
context = addContext("", "ROOT");
// ManagerContext
context = addContext("/manager", "manager");
context.setPrivileged(true);
// add new Engine to set of Engine for embedded server
embedded.addEngine(baseEngine);
// create Connector
httpConnector = embedded.createConnector((java.net.InetAddress) null,
portNumber, false);
// add new Connector to set of Connectors for embedded server, associated
// with Engine
embedded.addConnector(httpConnector);
}
public void start()
{
// start server
try
{
embedded.start();
}
catch (org.apache.catalina.LifecycleException ex)
{
ex.printStackTrace();
//fileLog.log("Startup failed");
//fileLog.log(ex.getMessage());
}
}
public Context addContext(
String path,
String docBase)
{
Context c;
c = embedded.createContext(path, docBase);
baseHost.addChild(c);
return c;
}
public static void main(String[] args)
{
new EmbeddedTomcat("test", 8080).start();
}
} |
Referenes