这篇文章简单实现在Java EE7 下实现远程客户端访问Java EE服务器EJB的功能
准备工作:
- JDK9(jdk-8u92)
- netbeans-8.1
- Java ee sdk (java_ee_sdk-7u2)
- 全部安装完成
- netbeans启用Java SE 和 Java EE相关插件
创建Enterprise Application
- 服务->服务器右键添加服务服务器->选择GlassFish Server->安装位置选择java_ee_sdk解压缩目录下glassfish4文件夹->输入管理员账户密码(先通过bin目录目录下asadmin 启动服务,浏览器访问localhost:4848 进入管理页面,默认账户密码是admin,changit 进入管理页面,在domain ->Administrator Password 页面下可直接修改密码)
- 新建项目->Java EE-> 企业应用程序->项目名称输入 CCEnterpriseApplication->服务器选择添加的GlassFish Server,Java EE 版本 Java EE 7,创建 EJB 模块和Web应用程序模块
3.创建EJB远端方法
接口类库,新建项目->Java->Java类库->名称 CCLibrary。
4.创建SessionBean,在CCEnterpriseApplication-ejb项目->新建会话 Bean->EJB 名称 CCSessionBean,包 cc.test.ejb ,回话状态 无状态 ,勾选本地和远程接口,远程方式位于项目选择CCLibrary
5.添加EJB 方法 ,在CCLibrary中的CCSessionBeanRemote.java中添加checkConn方法,在CCEnterpriseApplication-ejb项目的cc.test.ejb.CCSessionBeanLocal.java中添加localInfo方法。在CCSessionBean中实现2个方法。后续添加EJB方法可以在EJB的代码右键插入代码->添加 Business 代码 来添加新方法。
@Remote public interface CCSessionBeanRemote { /** * 检测连接 * @return */ public String checkConn(); }
import javax.ejb.Local; /** * * @author dev */ @Local public interface CCSessionBeanLocal { public String localInfo(); }
import javax.ejb.Stateless; /** * * @author dev */ @Stateless public class CCSessionBean implements CCSessionBeanRemote, CCSessionBeanLocal { @Override public String checkConn() { return "checkConn"; } @Override public String localInfo() { return "localInfo"; } }
6.创建client,新建项目->Java->Java 应用程式->项目名称 CCClient ,添加JFrame,名称LoginJFrame。添加一个JButton和一个JLabel,JButton添加点击事件
private void jButton1MouseClicked(java.awt.event.MouseEvent evt) { try { Date d = new Date(); Hashtable env = new Hashtable(); env.put("org.omg.CORBA.ORBInitialHost", "localhost"); env.put("org.omg.CORBA.ORBInitialPort", "3700"); InitialContext context = new InitialContext(env); Logger.getLogger(LoginJFrame.class.getName()).log(Level.INFO,String.valueOf(new Date().getTime()-d.getTime())); /** * 1."cc.test.ejb.CCSessionBeanRemote" * 2.CCSessionBeanRemote.class.getName() * 3.java:global/CCEnterpriseApplication/CCSessionBean */ CCSessionBeanRemote ccSession = (CCSessionBeanRemote)context.lookup(CCSessionBeanRemote.class.getName()); Logger.getLogger(LoginJFrame.class.getName()).log(Level.INFO,String.valueOf(new Date().getTime()-d.getTime())); this.messageLabel.setText(ccSession.checkConn()); Logger.getLogger(LoginJFrame.class.getName()).log(Level.INFO,String.valueOf(new Date().getTime()-d.getTime())); CCSessionBeanRemote ccSession2 = (CCSessionBeanRemote)context.lookup(CCSessionBeanRemote.class.getName()); Logger.getLogger(LoginJFrame.class.getName()).log(Level.INFO,String.valueOf(new Date().getTime()-d.getTime())); } catch (NamingException ex) { Logger.getLogger(LoginJFrame.class.getName()).log(Level.SEVERE, null, ex); } }
7.添加库,在CCClient项目中库添加CCLibrary项目,添加gf-client.
jar 文件(在 java_ee_sdk-7u2\glassfish4\glassfish\lib\) ,这篇实例客户端和服务器端在同一台机子上。
8.启动GlassFish Server,部署CCEnterpriseApplication,运行CCClient ,点击CCClient界面按钮,查看连接结果。如果连接成功可以点击2次按钮,对比运行速度,
可以看出new InitialContext用了1s多,获取EJB 用了3s ,调用EJB返回结果基本在个毫秒(本机无延时),第二次执行new InitialContext已经不耗时间说明没有重新创建,获取EJB对象也没有耗时,说明本地已经有
缓存了,跟着Context一起的。
五月 29, 2016 1:46:35 上午 cc.test.client.LoginJFrame jButton1MouseClicked 信息: 1197 五月 29, 2016 1:46:39 上午 cc.test.client.LoginJFrame jButton1MouseClicked 信息: 4502 五月 29, 2016 1:46:39 上午 cc.test.client.LoginJFrame jButton1MouseClicked 信息: 4548 五月 29, 2016 1:46:39 上午 cc.test.client.LoginJFrame jButton1MouseClicked 信息: 4564 五月 29, 2016 1:46:40 上午 cc.test.client.LoginJFrame jButton1MouseClicked 信息: 0 五月 29, 2016 1:46:40 上午 cc.test.client.LoginJFrame jButton1MouseClicked 信息: 16 五月 29, 2016 1:46:40 上午 cc.test.client.LoginJFrame jButton1MouseClicked 信息: 32 五月 29, 2016 1:46:40 上午 cc.test.client.LoginJFrame jButton1MouseClicked 信息: 32
最后说明下EJB对象名称问题,在GlassFish文档中使用的是第一种,可以正常使用;第二种写法是我个人推荐写法,值和第一种是一样的,在写代码的时候更方便;第三种是Java EE 7Tutorial第32.4Accessing Enterprise Beans介绍使用的方法,在此实例中没有调用成功,使用GlassFish不推荐。
/** * 1."cc.test.ejb.CCSessionBeanRemote" * 2.CCSessionBeanRemote.class.getName() * 3.java:global/CCEnterpriseApplication/CCSessionBean */
csdn地址:http://blog.csdn.net/qq_31417619/article/details/51527645
两个地方同步更新,都是自己的。
客户端完整代码
package cc.test.client;import cc.test.ejb.CCSessionBeanRemote;import java.sql.Time;import java.util.Date;import java.util.Hashtable;import java.util.Locale;import java.util.logging.Level;import java.util.logging.Logger;import javax.naming.InitialContext;import javax.naming.NamingException;import javax.naming.Context;/** * * @author dev */public class LoginJFrame extends javax.swing.JFrame { /** * Creates new form JFrame */ public LoginJFrame() { initComponents(); } /** * This method is called from within the constructor to initialize the form. * WARNING: Do NOT modify this code. The content of this method is always * regenerated by the Form Editor. */ @SuppressWarnings("unchecked") // <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents private void initComponents() { jLabel1 = new javax.swing.JLabel(); messageLabel = new javax.swing.JLabel(); jButton1 = new javax.swing.JButton(); setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); jLabel1.setText("EJB连接测试"); jButton1.setText("连接EJB glassfish"); jButton1.addMouseListener(new java.awt.event.MouseAdapter() { public void mouseClicked(java.awt.event.MouseEvent evt) { jButton1MouseClicked(evt); } }); javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); getContentPane().setLayout(layout); layout.setHorizontalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addGap(129, 129, 129) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addComponent(messageLabel) .addComponent(jLabel1))) .addGroup(layout.createSequentialGroup() .addGap(92, 92, 92) .addComponent(jButton1))) .addContainerGap(173, Short.MAX_VALUE)) ); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addContainerGap() .addComponent(jLabel1) .addGap(107, 107, 107) .addComponent(messageLabel) .addGap(40, 40, 40) .addComponent(jButton1) .addContainerGap(105, Short.MAX_VALUE)) ); pack(); }// </editor-fold>//GEN-END:initComponents private void jButton1MouseClicked(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_jButton1MouseClicked try { Date d = new Date(); Hashtable env = new Hashtable(); //GlassFish env.put("org.omg.CORBA.ORBInitialHost", "localhost"); env.put("org.omg.CORBA.ORBInitialPort", "3700"); //Jboss /* env.put(Context.URL_PKG_PREFIXES, "org.jboss.ejb.client.naming"); env.put(Context.INITIAL_CONTEXT_FACTORY,"org.jboss.naming.remote.client.InitialContextFactory"); env.put(Context.PROVIDER_URL, "http-remoting://localhost:8080"); env.put(Context.SECURITY_PRINCIPAL,"user");//用户名 env.put(Context.SECURITY_CREDENTIALS, "user");//密码 env.put("jboss.naming.client.ejb.context", true); */ Context context = new InitialContext(env); Logger.getLogger(LoginJFrame.class.getName()).log(Level.WARNING,String.valueOf(new Date().getTime()-d.getTime())); /** * 1."cc.test.ejb.CCSessionBeanRemote" * 2.CCSessionBeanRemote.class.getName() * 3.java:global/CCEnterpriseApplication/CCSessionBean * 4.CCEnterpriseApplication/CCEnterpriseApplication-ejb/CCSessionBean!cc.test.ejb.CCSessionBeanRemote" * */ // CCSessionBeanRemote ccSession = (CCSessionBeanRemote)context.lookup("CCEnterpriseApplication/CCEnterpriseApplication-ejb/CCSessionBean!"+CCSessionBeanRemote.class.getName()); CCSessionBeanRemote ccSession = (CCSessionBeanRemote)context.lookup(CCSessionBeanRemote.class.getName()); Logger.getLogger(LoginJFrame.class.getName()).log(Level.WARNING,String.valueOf(new Date().getTime()-d.getTime())); this.messageLabel.setText(ccSession.checkConn()); Logger.getLogger(LoginJFrame.class.getName()).log(Level.WARNING,String.valueOf(new Date().getTime()-d.getTime())); // CCSessionBeanRemote ccSession2 = (CCSessionBeanRemote)context.lookup("CCEnterpriseApplication/CCEnterpriseApplication-ejb/CCSessionBean!"+CCSessionBeanRemote.class.getName()); Logger.getLogger(LoginJFrame.class.getName()).log(Level.WARNING,String.valueOf(new Date().getTime()-d.getTime())); } catch (NamingException ex) { Logger.getLogger(LoginJFrame.class.getName()).log(Level.SEVERE, null, ex); } }//GEN-LAST:event_jButton1MouseClicked /** * @param args the command line arguments */ public static void main(String args[]) { /* Set the Nimbus look and feel */ //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) "> /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel. * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html */ try { for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) { if ("Nimbus".equals(info.getName())) { javax.swing.UIManager.setLookAndFeel(info.getClassName()); break; } } } catch (ClassNotFoundException ex) { java.util.logging.Logger.getLogger(LoginJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (InstantiationException ex) { java.util.logging.Logger.getLogger(LoginJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (IllegalAccessException ex) { java.util.logging.Logger.getLogger(LoginJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (javax.swing.UnsupportedLookAndFeelException ex) { java.util.logging.Logger.getLogger(LoginJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } //</editor-fold> //</editor-fold> /* Create and display the form */ java.awt.EventQueue.invokeLater(new Runnable() { public void run() { new LoginJFrame().setVisible(true); } }); } // Variables declaration - do not modify//GEN-BEGIN:variables private javax.swing.JButton jButton1; private javax.swing.JLabel jLabel1; private javax.swing.JLabel messageLabel; // End of variables declaration//GEN-END:variables}
View Code
原标题:Java EE 远程客户的访问EJB实现实例(GlassFish)
关键词:JAVA