2022年Eclipse开发EJB文档 .pdf

《2022年Eclipse开发EJB文档 .pdf》由会员分享，可在线阅读，更多相关《2022年Eclipse开发EJB文档 .pdf（19页珍藏版）》请在淘文阁 - 分享文档赚钱的网站上搜索。

1、Eclipse开发 EJB 文档此文档主要介绍了在eclipse IDE 下开发 EJB,着重介绍开发session bean的环境配置，开发过程，打包，部署，应用程序调用，关于entity bean，消息驱动bean 下次再给大家分解. 一、 session bean 环境配置及开发过程1.配置编译环境名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 1 页，共 19 页 - - - - - - - - - 注：由于 EJB2.0 技术相对很早， 所以 jdk，jre 都是 1.4,

2、建议用发布服务器自带的低版本jdk,jre ，这样相对保险一些。二、开发session过程1.建立 EJB 工程名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 2 页，共 19 页 - - - - - - - - - 2.建立一个 Session bean 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 3 页，共 19 页 - - - - - - - - - 代码如下：p

3、ackage com.first.ejb; import java.rmi.RemoteException; import javax.ejb.EJBException; import javax.ejb.SessionBean; import javax.ejb.SessionContext; publicclass hello implements SessionBean /*Thesessioncontext*/private SessionContext context; public hello() / TODO Auto-generated constructor stub pub

4、licvoid ejbActivate() throws EJBException, RemoteException / TODO Auto-generated method stub名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 4 页，共 19 页 - - - - - - - - - publicvoid ejbPassivate() throws EJBException, RemoteException / TODO Auto-generated method stub pu

5、blicvoid ejbRemove() throws EJBException, RemoteException / TODO Auto-generated method stub publicvoid setSessionContext(SessionContext newContext) throws EJBException context = newContext; publicvoid replaceWithRealBusinessMethod() throws EJBException / rename and start putting your business logic

6、here public String login() returnhello world!; 3.用eclipse Xdoclet生成相应的 Home接口，远程接口，实现远程接口的bean ，具体操作如下：名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 5 页，共 19 页 - - - - - - - - - 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 6 页，共 19

7、 页 - - - - - - - - - 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 7 页，共 19 页 - - - - - - - - - 到此， EJB 自动生成接口已经设置成功。4.运行Xdoclet生成相应的接口，如图名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 8 页，共 19 页 - - - - - - - - - 这时已经生成代码雏形，然后再手写一些代

8、码，把远程调用方法实现，具体代码如下：hello.java 文件package com.first.ejb; import java.rmi.RemoteException; import javax.ejb.EJBException; import javax.ejb.SessionBean; import javax.ejb.SessionContext; publicclass hello implements SessionBean /*Thesessioncontext*/private SessionContext context; 名师资料总结 - - -精品资料欢迎下载 - -

9、 - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 9 页，共 19 页 - - - - - - - - - public hello() / TODO Auto-generated constructor stub publicvoid ejbActivate() throws EJBException, RemoteException / TODO Auto-generated method stub publicvoid ejbPassivate() throws EJBException, RemoteException /

10、TODO Auto-generated method stub publicvoid ejbRemove() throws EJBException, RemoteException / TODO Auto-generated method stub publicvoid setSessionContext(SessionContext newContext) throws EJBException context = newContext; publicvoid replaceWithRealBusinessMethod() throws EJBException / rename and

11、start putting your business logic here public String login() returnhello world!; helloSession.java 文件package com.first.ejb; public class helloSession extends com.first.ejb.hello implements javax.ejb.SessionBean public void ejbActivate() throws javax.ejb.EJBException, java.rmi.RemoteException 名师资料总结

12、- - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 10 页，共 19 页 - - - - - - - - - super.ejbActivate(); public void ejbPassivate() throws javax.ejb.EJBException, java.rmi.RemoteException super.ejbPassivate(); public void setSessionContext(javax.ejb.SessionContext ctx) throws java

13、x.ejb.EJBException super.setSessionContext(ctx); public void unsetSessionContext() public void ejbRemove() throws javax.ejb.EJBException, java.rmi.RemoteException super.ejbRemove(); public void ejbCreate() throws javax.ejb.CreateException Hello.java 文件，定义远程接口package com.first.interfaces; import java

14、.rmi.RemoteException; publicinterface hello extends javax.ejb.EJBObject publicvoid replaceWithRealBusinessMethod( ) throws java.rmi.RemoteException; 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 11 页，共 19 页 - - - - - - - - - public String login() throws RemoteExcept

15、ion; helloHome.java 文件定义 Home接口package com.first.interfaces; public interface helloHome extends javax.ejb.EJBHome public static final String COMP_NAME=java:comp/env/ejb/hello; public static final String JNDI_NAME=ejb/hello; public com.first.interfaces.hello create() throws javax.ejb.CreateException,

16、java.rmi.RemoteException; 自动生成的配置helloUtil.java文件package com.first.interfaces; public class helloUtil /* Cached remote home (EJBHome). Uses lazy loading to obtain its value (loaded by getHome() methods). */ private static com.first.interfaces.helloHome cachedRemoteHome = null; private static Object

17、lookupHome(java.util.Hashtable environment, String jndiName, Class narrowTo) throws javax.naming.NamingException / Obtain initial context javax.naming.InitialContext initialContext = new javax.naming.InitialContext(environment); try Object objRef = initialContext.lookup(jndiName); / only narrow if n

18、ecessary if (java.rmi.Remote.class.isAssignableFrom(narrowTo) return javax.rmi.PortableRemoteObject.narrow(objRef, narrowTo); else return objRef; finally initialContext.close(); 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 12 页，共 19 页 - - - - - - - - - public stati

19、c com.first.interfaces.helloHome getHome() throws javax.naming.NamingException if (cachedRemoteHome = null) cachedRemoteHome = (com.first.interfaces.helloHome) lookupHome(null, com.first.interfaces.helloHome.COMP_NAME, com.first.interfaces.helloHome.class); return cachedRemoteHome; public static com

20、.first.interfaces.helloHome getHome( java.util.Hashtable environment ) throws javax.naming.NamingException return (com.first.interfaces.helloHome) lookupHome(environment, com.first.interfaces.helloHome.COMP_NAME, com.first.interfaces.helloHome.class); private static String hexServerIP = null; / init

21、ialise the secure random instance private static final java.security.SecureRandom seeder = new java.security.SecureRandom(); public static final String generateGUID(Object o) StringBuffer tmpBuffer = new StringBuffer(16); if (hexServerIP = null) .InetAddress localInetAddress = null; try / get the in

22、et address localInetAddress = .InetAddress.getLocalHost(); catch (.UnknownHostException uhe) System.err.println(helloUtil: Could not get the local IP address using InetAddress.getLocalHost()!); / todo: find better way to get around this. uhe.printStackTrace(); return null; byte serverIP = localInetA

23、ddress.getAddress(); 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 13 页，共 19 页 - - - - - - - - - hexServerIP = hexFormat(getInt(serverIP), 8); String hashcode = hexFormat(System.identityHashCode(o), 8); tmpBuffer.append(hexServerIP); tmpBuffer.append(hashcode); long

24、 timeNow = System.currentTimeMillis(); int timeLow = (int)timeNow & 0 xFFFFFFFF; int node = seeder.nextInt(); StringBuffer guid = new StringBuffer(32); guid.append(hexFormat(timeLow, 8); guid.append(tmpBuffer.toString(); guid.append(hexFormat(node, 8); return guid.toString(); private static int getI

25、nt(byte bytes) int i = 0; int j = 24; for (int k = 0; j = 0; k+) int l = bytesk & 0 xff; i += l j; j -= 8; return i; private static String hexFormat(int i, int j) String s = Integer.toHexString(i); return padHex(s, j) + s; private static String padHex(String s, int i) StringBuffer tmpBuffer = new St

26、ringBuffer(); if (s.length() i) for (int j = 0; j i - s.length(); j+) tmpBuffer.append(0); return tmpBuffer.toString(); 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 14 页，共 19 页 - - - - - - - - - 发布的 ejb-jar.xml文件Generated by XDocletName for hellohellocom.first.inte

27、rfaces.helloHomecom.first.interfaces.hellocom.first.ejb.helloSessionStatelessContainerhello* Required 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 15 页，共 19 页 - - - - - - - - - 发布的 weblogic-ejb-jar.xml 文件helloejb/hello三、 打包即：服务器端weblogic发布的 jar包和应用程序调用EJB 的客户段 jar包

28、名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 16 页，共 19 页 - - - - - - - - - 四、 发布EJB 把EJB 包放到 beauser_projectsdomainsliuyuwudomainapplications和beaweblogic81serverlib下，启动服务器，登陆http:/localhost:7001/console/名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整

29、理 - - - - - - - 第 17 页，共 19 页 - - - - - - - - - 五、调用 EJB 把打好的客户端包和wlclient.jar导入，执行下面代码可以进行验证：public class TestEJB public static void main(String args) throws Exception /得到与远程通信的连接 Hashtable cs=new Hashtable(); cs.put(Context.INITIAL_CONTEXT_FACTORY,weblogic.jndi.WLInitialContextFactory); cs.put(Con

30、text.PROVIDER_URL,t3:/192.168.1.100:7001); Context con = new InitialContext(cs); LoginHome home=(LoginHome)con.lookup(Login); Login login=home.create(); if(login.login(liu,123) System.out.println(远程调用成功!); System.out.println(-); helloHome h=(helloHome)con.lookup(ejb/hello); hello hh=h.create(); System.out.println(hh.login(); 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 18 页，共 19 页 - - - - - - - - - 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 19 页，共 19 页 - - - - - - - - -