studenttestclient1.java

书籍源程序《J2EE应用开发（WebLogic+JBuilder）》代码

package cmpsample;

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

public class StudentTestClient1 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 StudentRemoteHome studentRemoteHome = null;
  private StudentRemote studentRemote = null;

  //Construct the EJB test client
  public StudentTestClient1() {
    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("StudentRemote");
      //look up jndi name and cast to Home interface
      studentRemoteHome = (StudentRemoteHome) PortableRemoteObject.narrow(ref, StudentRemoteHome.class);
      if (logging) {
        long endTime = System.currentTimeMillis();
        log("Succeeded initializing local bean access through Local 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://zhaoqiang: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 StudentRemote create(Integer stuid) {
    long startTime = 0;
    if (logging) {
      log("Calling create(" + stuid + ")");
      startTime = System.currentTimeMillis();
    }
    try {
      studentRemote = studentRemoteHome.create(stuid);
      if (logging) {
        long endTime = System.currentTimeMillis();
        log("Succeeded: create(" + stuid + ")");
        log("Execution time: " + (endTime - startTime) + " ms.");
      }
    }
    catch(Exception e) {
      if (logging) {
        log("Failed: create(" + stuid + ")");
      }
      e.printStackTrace();
    }

    if (logging) {
      log("Return value from create(" + stuid + "): " + studentRemote + ".");
    }
    return studentRemote;
  }

  public StudentRemote findByPrimaryKey(Integer stuid) {
    long startTime = 0;
    if (logging) {
      log("Calling findByPrimaryKey(" + stuid + ")");
      startTime = System.currentTimeMillis();
    }
    try {
      studentRemote = studentRemoteHome.findByPrimaryKey(stuid);
      if (logging) {
        long endTime = System.currentTimeMillis();
        log("Succeeded: findByPrimaryKey(" + stuid + ")");
        log("Execution time: " + (endTime - startTime) + " ms.");
      }
    }
    catch(Exception e) {
      if (logging) {
        log("Failed: findByPrimaryKey(" + stuid + ")");
      }
      e.printStackTrace();
    }

    if (logging) {
      log("Return value from findByPrimaryKey(" + stuid + "): " + studentRemote + ".");
    }
    return studentRemote;
  }

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

  public Integer getStuid() {
    Integer returnValue = null;

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

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

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

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

  public void setStuname(String stuname) {
    if (studentRemote == null) {
      System.out.println("Error in setStuname(): " + ERROR_NULL_REMOTE);
      return ;
    }

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

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

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

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

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

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

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

  public void setLockerid(Integer lockerid) {
    if (studentRemote == null) {
      System.out.println("Error in setLockerid(): " + ERROR_NULL_REMOTE);
      return ;
    }

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

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

  public Integer getLockerid() {
    Integer returnValue = null;

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

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

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

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

  public void executeRemoteCallsWithDefaultArguments() {
    if (studentRemote == null) {
      System.out.println("Error in executeRemoteCallsWithDefaultArguments(): " + ERROR_NULL_REMOTE);
      return ;
    }
    getStuid();
    setStuname("");
    getStuname();
    setLockerid(null);
    getLockerid();
  }

  //----------------------------------------------------------------------------
  // 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) {
    StudentTestClient1 client = new StudentTestClient1();
    client.findByPrimaryKey(new Integer(1));
    System.out.println("stuid="+client.getStuid());
    System.out.println("stuname="+client.getStuname());
    System.out.println("lockerid="+client.getLockerid());
    //client.create(new Integer(4));(调用该语句可以新建Student实例）
  }
}