发信人: vikern()
整理人: zjxyz(2002-09-08 22:55:14), 站内信件
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摸索了好久才稍微有点明白了，想到自己摸索时到处找例子的痛苦，于是自己做了一个例子，并把过程写了一下希望对大家有所把帮助.
一、Weblogic6.1和Jb6的集成实践见如下URL
http://www.linuxaid.com.cn/developer/showdev.jsp?&i=508
二、在发布EJB前，先Verify一次，没有Error和Warning才发布，因为如果eb-jar.xml有报错也一样可以发布到Weblogic6.1中,同时自动产生的*.xml有时会有错误的，别太过迷信它，本人就在这里受了不少苦
三、例程
------------------Hello.java------------------------------
package myhello;
import java.rmi.*;
import javax.ejb.*;
public interface Hello extends EJBObject {
public String hello() throws java.rmi.RemoteException;
}
-------------------HelloBean.java ----------------------
package myhello;
import java.rmi.*;
import javax.ejb.*;
public class HelloBean implements SessionBean {
private SessionContext sessionContext;
public void ejbCreate() {
}
public void ejbRemove() {
}
public void ejbActivate() {
}
public void ejbPassivate() {
}
public void setSessionContext(SessionContext sessionContext) {
this.sessionContext = sessionContext;
}
public String hello(){
System.out.print("Hello()");
return "Hello,World!";
}
}
-----------------HelloHome.java--------------------------
package myhello;
import java.rmi.*;
import javax.ejb.*;
public interface HelloHome extends EJBHome {
public Hello create() throws RemoteException, CreateException;
}
-----------------------HelloTestClient1 ---------------
package myhello;
import javax.naming.*;
import java.util.Properties;
import javax.rmi.PortableRemoteObject;
public class HelloTestClient1 {
private static final String ERROR_NULL_REMOTE = "Remote interface reference is null. It must be created by calling one of the Home interface methods first.";
private static final int MAX_OUTPUT_LINE_LENGTH = 100;
private boolean logging = true;
private HelloHome helloHome = null;
private Hello hello = null;
//Construct the EJB test client
public HelloTestClient1() {
long startTime = 0;
if (logging) {
log("Initializing bean access.");
startTime = System.currentTimeMillis();
}
try {
//get naming context
Context ctx = getInitialContext();
//look up jndi name
Object ref = ctx.lookup("Hello");
//cast to Home interface
helloHome = (HelloHome) PortableRemoteObject.narrow(ref, HelloHome.class);
if (logging) {
long endTime = System.currentTimeMillis();
log("Succeeded initializing bean access.");
log("Execution time: " + (endTime - startTime) + " ms.");
}
}
catch(Exception e) {
if (logging) {
log("Failed initializing bean access.");
}
e.printStackTrace();
}
}
private Context getInitialContext() throws Exception {
String url = "t3://localhost:7001";
String user = null;
String password = null;
Properties properties = null;
try {
properties = new Properties();
properties.put(Context.INITIAL_CONTEXT_FACTORY, "weblogic.jndi.WLInitialContextFactory");
properties.put(Context.PROVIDER_URL, url);
if (user != null) {
properties.put(Context.SECURITY_PRINCIPAL, user);
properties.put(Context.SECURITY_CREDENTIALS, password == null ? "" : password);
}
return new InitialContext(properties);
}
catch(Exception e) {
log("Unable to connect to WebLogic server at " + url);
log("Please make sure that the server is running.");
throw e;
}
}
//----------------------------------------------------------------------------
// Methods that use Home interface methods to generate a Remote interface reference
//----------------------------------------------------------------------------
public Hello create() {
long startTime = 0;
if (logging) {
log("Calling create()");
startTime = System.currentTimeMillis();
}
try {
hello = helloHome.create();
if (logging) {
long endTime = System.currentTimeMillis();
log("Succeeded: create()");
log("Execution time: " + (endTime - startTime) + " ms.");
}
}
catch(Exception e) {
if (logging) {
log("Failed: create()");
}
e.printStackTrace();
}
if (logging) {
log("Return value from create(): " + hello + ".");
}
return hello;
}
//----------------------------------------------------------------------------
// Methods that use Remote interface methods to access data through the bean
//----------------------------------------------------------------------------
public String hello() {
String returnValue = "";
if (hello == null) {
System.out.println("Error in hello(): " + ERROR_NULL_REMOTE);
return returnValue;
}
long startTime = 0;
if (logging) {
log("Calling hello()");
startTime = System.currentTimeMillis();
}
try {
returnValue = hello.hello();
if (logging) {
long endTime = System.currentTimeMillis();
log("Succeeded: hello()");
log("Execution time: " + (endTime - startTime) + " ms.");
}
}
catch(Exception e) {
if (logging) {
log("Failed: hello()");
}
e.printStackTrace();
}
if (logging) {
log("Return value from hello(): " + returnValue + ".");
}
return returnValue;
}
public void testRemoteCallsWithDefaultArguments() {
if (hello == null) {
System.out.println("Error in testRemoteCallsWithDefaultArguments(): " + ERROR_NULL_REMOTE);
return ;
}
hello();
}
//----------------------------------------------------------------------------
// Utility Methods
//----------------------------------------------------------------------------
private void log(String message) {
if (message == null) {
System.out.println("-- null");
return ;
}
if (message.length() > MAX_OUTPUT_LINE_LENGTH) {
System.out.println("-- " + message.substring(0, MAX_OUTPUT_LINE_LENGTH) + " ...");
}
else {
System.out.println("-- " + message);
}
}
//Main method
public static void main(String[] args) {
HelloTestClient1 client = new HelloTestClient1();
Hello ff=client.create();
ff.hello();
try {
System.out.println("===============");
System.out.println(ff.hello());
System.out.println("===============");
}
catch (java.rmi.RemoteException ex) {
ex.printStackTrace();
}
// Use the client object to call one of the Home interface wrappers
// above, to create a Remote interface reference to the bean.
// If the return value is of the Remote interface type, you can use it
// to access the remote interface methods. You can also just use the
// client object to call the Remote interface wrappers.
}
}
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