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Topic: re: 一个简单的servlet CORBA client程序

1.re: 一个简单的servlet CORBA client程序

Posted by: sothis
Posted on: 2003-01-16 18:03

本文回答
http://www.chinajavaworld.net/forum/topic.cgi?forum=33&topic=268&show=0

下面是一个简单的servlet程序，该程序作为CORBA客户端存取一个CORBA服务器，返回服务器程序所在的主机的当前UNIX时间。如果想试一下该程序的话，可以使用BES5.1，使用BES所携带的J2SDK1.3.1_04。

public class Servlet2 extends HttpServlet {
private org.omg.CORBA.ORB myOrb = null ;
private servletclient.MyServices.TimeServer myServer = null;
static final private String CONTENT_TYPE = "text/html; charset=GBK";
//Initialize global variables
public void init() throws ServletException {
if (myServer == null) {
if (myOrb == null) {
myOrb = org.omg.CORBA.ORB.init((String[])null, System.getProperties());
}
myServer = servletclient.MyServices.TimeServerHelper.bind(myOrb, "/TimeServer_poa", "TimeServer".getBytes());
}
}
//Process the HTTP Get request
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType(CONTENT_TYPE);
PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<head><title>Servlet2</title></head>");
out.println("<body>");
out.println("<p>The servlet has received a GET. This is the reply.</p>");
out.println(myServer.getTime());
out.println("</body></html>");
}
//Clean up resources
public void destroy() {
}
}

当然，别忘了跑SmartAgent(如果运行了BES那么smartAgent就起来了，否则需要运行osagent跑smartAgent)以及服务程序，下面是服务程序的代码

public class MyServicesServerApp {

public static void main(String[] args) {
try{

org.omg.CORBA.ORB orb = org.omg.CORBA.ORB.init(args, System.getProperties());

POA poaRoot = POAHelper.narrow(orb.resolve_initial_references("RootPOA"));

name = "TimeServer";
org.omg.CORBA.Policy[] TimeServerPolicies = {
poaRoot.create_lifespan_policy(LifespanPolicyValue.PERSISTENT)
};
POA poaTimeServer = poaRoot.create_POA(name + "_poa",
poaRoot.the_POAManager(),
TimeServerPolicies);
poaTimeServer.activate_object_with_id(name.getBytes(), new TimeServerImpl());
poaRoot.the_POAManager().activate();
orb.run();
}
catch(Exception ex) {
System.err.println(ex);
}
}
}

在C/S之间使用的IDL定义为
module MyServices {

interface TimeServer {
string getTime();
};
};

2.Re:一个简单的servlet CORBA client程序 [Re: sothis]	Copy to clipboard
Posted by: sothis Posted on: 2003-01-16 18:36 忘了实现类代码 package servletclient.MyServices.server; import java.sql.; import java.util.; import java.math.; import org.omg.PortableServer.; public class TimeServerImpl extends servletclient.MyServices.TimeServerPOA { public String getTime() { return "The Time on Server is" + String.valueOf(System.currentTimeMillis()); } }