enterprise1testclient1.java

自己学习EJB时

package statelesssessionbean;

import javax.naming.*;
import java.util.Properties;
import javax.rmi.PortableRemoteObject;
/*
 *SessionBean的客户端测试程序
 */
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();
    }

    try {
      //得到运行环境的context，通过getInitialContext()方法实现，不同的J2EE服务器在这里的运行代码不一样
      Context context = getInitialContext();

      //通过context查找服务器上的JNDI名字
      Object ref = context.lookup("Enterprise1");
      //得到EJB的Home Interface
      enterprise1Home = (Enterprise1Home) PortableRemoteObject.narrow(ref, Enterprise1Home.class);

      //从Home Interface得到Remote Interface
      //  enterprise1=create();  //this creat() is in the client
        enterprise1=enterprise1Home.create();

      //从Remote Interface中调用其中的方法
       double fist=3;
       double second=5;
       double result=enterprise1.addtion(fist,second);
       System.out.println("fist:"+fist +"second"+second+"result"+result);

      if (logging) {
        long endTime = System.currentTimeMillis();
        log("Succeeded initializing bean access through Home interface.");
        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://zxp:7001";//        t3://zxp:7001是服务器的运行地址，其中zxp是计算机名称，7001是端口号
    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 double addtion(double fist, double second) {
    double returnValue = 0f;

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

    long startTime = 0;
    if (logging) {
      log("Calling addtion(" + fist + ", " + second + ")");
      startTime = System.currentTimeMillis();
    }

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

    if (logging) {
      log("Return value from addtion(" + fist + ", " + second + "): " + returnValue + ".");
    }
    return returnValue;
  }

  //----------------------------------------------------------------------------
  // 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();
    // 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.
  }
}