secondejbbean.java

这里面有150个从简单到难的java 程序的源代码

package interejbs;

import javax.ejb.*;
import javax.naming.*;
import java.util.Properties;
import javax.rmi.PortableRemoteObject;

public class secondEJBBean implements SessionBean {
  SessionContext sessionContext;
  private firstEJBHome firstEJBHomeObject = null;
  public void ejbCreate() throws CreateException {
    try {
      //得到名字上下文
      Context ctx = getInitialContext();
      //查询jndi名
      Object ref = ctx.lookup("firstEJB");
      //通过强制转型得到Home接口
      firstEJBHomeObject = (firstEJBHome) PortableRemoteObject.narrow(ref, firstEJBHome.class);
    }
    catch(Exception e) {
      e.printStackTrace();
    }   
  }
  public void ejbRemove() {
  }
  public void ejbActivate() {
  }
  public void ejbPassivate() {
  }
    //这个函数返回一个经过初始化的上下文
  private Context getInitialContext() throws Exception {
    String url = "t3://cgb-4wn01xj69v6:7001";
    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) {
         throw e;
    }
  }
  public void setSessionContext(SessionContext sessionContext) {
    this.sessionContext = sessionContext;
  }
  //这个函数将被FirstEJB调用，同时它将调用secondEJB
  public String forFirst(String fromFirst) {
    try {
      firstEJB firstEJB=firstEJBHomeObject.create();
      fromFirst=fromFirst+"This is secondEJB called by firstEJB\n";
      fromFirst=firstEJB.forSecond(fromFirst);
    }
    catch(Exception e) {
            e.printStackTrace();
    }    
    return fromFirst;
  }
}