JAVA 基础例题包含了JAVA常见的问题和常见的习题

				package csejb;								import javax.naming.*;				import java.util.Properties;				import javax.rmi.PortableRemoteObject;								public class CsClient {				  private theServerHome theServerHomeObject = null;								  //创建一个访问EJB的客户端应用程序				  public CsClient() {				    try {				      //得到名字上下文				      Context ctx = getInitialContext();				      //查询jndi名				      Object ref = ctx.lookup("theServer");				      //通过强制转型得到Home接口				      theServerHomeObject = (theServerHome) PortableRemoteObject.narrow(ref, theServerHome.class);				    }				    catch(Exception e) {				      e.printStackTrace();				    }				  }					//这个函数返回一个经过初始化的上下文				  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) {				      System.out.println("Unable to connect to WebLogic server at " + url);				      System.out.println("Please make sure that the server is running.");				      throw e;				    }				  }								  //----------------------------------------------------------------------------				  // 工具函数				  //----------------------------------------------------------------------------								  public theServerHome getHome() {				    return theServerHomeObject;				  }				  //Main函数								  public static void main(String[] args) {				    String retStr="This is C/S EJB example.\n";				     CsClient client = new CsClient();					  //用client的getHome()函数调用Home接口函数得到远程接口的引用 				    // 用远程接口的引用访问EJB				    try {				      retStr=retStr+"Now the Client application is ready to access the Server.\n";				      theServer theServer=client.getHome().create();				      retStr=retStr+theServer.CServer();				      retStr=retStr+"This is client speaking.\nThe example is over!\n";				      System.out.print(retStr);				    }				    catch(Exception e) {				        e.printStackTrace();				    }								  }				}