enterprise1testclient1.java~1~

以前自己学习EJB编程时

package helloejb;

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

public class Enterprise1TestClient1 extends Object {
  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 Enterprise1Home enterprise1Home = null;
  private Enterprise1 enterprise1 = null;

  //Construct the EJB test client
  public Enterprise1TestClient1() {
    initialize();
  }

  public void initialize() {
    long startTime = 0;
    if (logging) {
      log("Initializing bean access.");
      startTime = System.currentTimeMillis();
    }
//  1. 通过JNDI检索到EJB的HOME接口
    try {
      //获得初始上下文信息
      Context context = getInitialContext();

      //检索名称为：Enterprise1：的对象
      Object ref = context.lookup("Enterprise1");
      //获得“Enterprise1”的HOME接口
      enterprise1Home = (Enterprise1Home) PortableRemoteObject.narrow(ref, Enterprise1Home.class);
      if (logging) {
        long endTime = System.currentTimeMillis();
        log("Succeeded initializing bean access through Home interface.");
        log("Execution time: " + (endTime - startTime) + " ms.");
      }
      Enterprise1 enterprise1=enterprise1Home.create();
      String str=enterprise1.sayHello("OK!");
    }
    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 Enterprise1 create() {
    long startTime = 0;
    if (logging) {
      log("Calling create()");
      startTime = System.currentTimeMillis();
    }
    try {
      enterprise1 = enterprise1Home.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(): " + enterprise1 + ".");
    }
    return enterprise1;
  }

  //----------------------------------------------------------------------------
  // Methods that use Remote interface methods to access data through the bean
  //----------------------------------------------------------------------------

  public String sayHello(String msg) {
    String returnValue = "";

    if (enterprise1 == null) {
      System.out.println("Error in sayHello(): " + ERROR_NULL_REMOTE);
      return returnValue;
    }

    long startTime = 0;
    if (logging) {
      log("Calling sayHello(" + msg + ")");
      startTime = System.currentTimeMillis();
    }

    try {
      returnValue = enterprise1.sayHello(msg);
      if (logging) {
        long endTime = System.currentTimeMillis();
        log("Succeeded: sayHello(" + msg + ")");
        log("Execution time: " + (endTime - startTime) + " ms.");
      }
    }
    catch(Exception e) {
      if (logging) {
        log("Failed: sayHello(" + msg + ")");
      }
      e.printStackTrace();
    }

    if (logging) {
      log("Return value from sayHello(" + msg + "): " + returnValue + ".");
    }
    return returnValue;
  }

  public void executeRemoteCallsWithDefaultArguments() {
    if (enterprise1 == null) {
      System.out.println("Error in executeRemoteCallsWithDefaultArguments(): " + ERROR_NULL_REMOTE);
      return ;
    }
    sayHello("");
  }

  //----------------------------------------------------------------------------
  // 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) {
    Enterprise1TestClient1 client = new Enterprise1TestClient1();
    try{
       client.create();
       System.out.println(client.sayHello("DEMO ONE"));
    }catch(Exception e){
    e.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.

  }
}