//一個簡單例子的客戶端測試程序package simpleejb;import javax.naming.*;import java.util.Properties;import javax.rmi.PortableRemoteObject;public class TimeFunctionsTestClient1 {  static final private String ERROR_NULL_REMOTE = "Remote interface reference is null.  It must be created by calling one of the Home interface methods first.";  static final private int MAX_OUTPUT_LINE_LENGTH = 100;  private boolean logging = true;  private TimeFunctionsHome timeFunctionsHome = null;  private TimeFunctions timeFunctions = null;  //創(chuàng)建一個訪問EJB的客戶端應用程序  public TimeFunctionsTestClient1() {    long startTime = 0;    if (logging) {      log("Initializing bean access.");      startTime = System.currentTimeMillis();    }    try {      //得到名字上下文      Context ctx = getInitialContext();      //查詢jndi名      Object ref = ctx.lookup("TimeFunctions");      //通過強制轉(zhuǎn)型得到Home接口      timeFunctionsHome = (TimeFunctionsHome) PortableRemoteObject.narrow(ref, TimeFunctionsHome.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://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) {      log("Unable to connect to WebLogic server at " + url);      log("Please make sure that the server is running.");      throw e;    }  }  //----------------------------------------------------------------------------  // 這個函數(shù)用于使用本地接口產(chǎn)生一個遠程接口的應用   //----------------------------------------------------------------------------  public TimeFunctions create() {    long startTime = 0;    if (logging) {      log("Calling create()");      startTime = System.currentTimeMillis();    }    try {      timeFunctions = timeFunctionsHome.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(): " + timeFunctions + ".");    }    return timeFunctions;  }   //通過Bean使用遠程接口方法訪問數(shù)據(jù)    public long getTime() {    long returnValue = 0;    if (timeFunctions == null) {      System.out.println("Error in getTime(): " + ERROR_NULL_REMOTE);      return returnValue;    }    long startTime = 0;    if (logging) {      log("Calling getTime()");      startTime = System.currentTimeMillis();    }    try {      returnValue = timeFunctions.getTime();      if (logging) {        long endTime = System.currentTimeMillis();        log("Succeeded: getTime()");        log("Execution time: " + (endTime - startTime) + " ms.");      }    }    catch(Exception e) {      if (logging) {        log("Failed: getTime()");      }      e.printStackTrace();    }    if (logging) {      log("Return value from getTime(): " + returnValue + ".");    }    return returnValue;  }  public void testRemoteCallsWithDefaultArguments() {    if (timeFunctions == null) {      System.out.println("Error in testRemoteCallsWithDefaultArguments(): " + ERROR_NULL_REMOTE);      return ;    }    getTime();  }  // 工具函數(shù)  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()函數(shù)  public static void main(String[] args) {    TimeFunctionsTestClient1 client = new TimeFunctionsTestClient1();    client.create();    client.getTime();      }}