helloejbtestclient1.java

java ejb开发 程序4、语句alter table people add(phone_number varchar2(10)) 的作用是 A 修改表结构 B 为people表添加约束

package hello;

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

public class HelloEJBTestClient1 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 HelloEJBHome helloEJBHome = null;
  private HelloEJB helloEJB = null;

  //Construct the EJB test client
  public HelloEJBTestClient1() {
    initialize();
  }

  public void initialize() {
    long startTime = 0;
    if (logging) {
      log("Initializing bean access.");
      startTime = System.currentTimeMillis();
    }

    try {
      //get naming context
      Context context = getInitialContext();

      //look up jndi name
      Object ref = context.lookup("HelloEJB");
      //look up jndi name and cast to Home interface
      helloEJBHome = (HelloEJBHome) PortableRemoteObject.narrow(ref, HelloEJBHome.class);
      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://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 HelloEJB create() {
    long startTime = 0;
    if (logging) {
      log("Calling create()");
      startTime = System.currentTimeMillis();
    }
    try {
      helloEJB = helloEJBHome.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(): " + helloEJB + ".");
    }
    return helloEJB;
  }

  public void remove(Handle p0) {
    long startTime = 0;
    if (logging) {
      log("Calling remove(" + p0 + ")");
      startTime = System.currentTimeMillis();
    }

    try {
      helloEJBHome.remove(p0);
      if (logging) {
        long endTime = System.currentTimeMillis();
        log("Succeeded: remove(" + p0 + ")");
        log("Execution time: " + (endTime - startTime) + " ms.");
      }
    }
    catch(Exception e) {
      if (logging) {
        log("Failed: remove(" + p0 + ")");
      }
      e.printStackTrace();
    }
  }

  public void remove(Object p0) {
    long startTime = 0;
    if (logging) {
      log("Calling remove(" + p0 + ")");
      startTime = System.currentTimeMillis();
    }

    try {
      helloEJBHome.remove(p0);
      if (logging) {
        long endTime = System.currentTimeMillis();
        log("Succeeded: remove(" + p0 + ")");
        log("Execution time: " + (endTime - startTime) + " ms.");
      }
    }
    catch(Exception e) {
      if (logging) {
        log("Failed: remove(" + p0 + ")");
      }
      e.printStackTrace();
    }
  }

  public EJBMetaData getEJBMetaData() {
    EJBMetaData returnValue = null;

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

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

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

  public HomeHandle getHomeHandle() {
    HomeHandle returnValue = null;

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

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

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

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

  public String hello() {
    String returnValue = "";

    if (helloEJB == 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 = helloEJB.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;
  }

  //----------------------------------------------------------------------------
  // 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) {
    HelloEJBTestClient1 client = new HelloEJBTestClient1();
    HelloEJB hello             = client.create();
    double fi = 0;

    try
    {
        fi = hello.compute(50);
        System.out.println(fi);
        System.out.println(hello.hello());
    }
    catch (Exception ex)
    {
        //
    }
  }
  }