J2EE与中间件技术j2ee应用.ppt

Account.jsp Account.jsp 客户在JSP页面输入账户信息（id, firstname, lastname, balance） 选择要进行的操作（create, find, debit, credit） 输入Debit/Credit操作需要的amount JSP页面传递参数到Java Bean，并将 返回值显示出来 Account.jsp …… jsp:useBean id=accountBean scope=session class=“app.AccountJavaBean / jsp:setProperty name=accountBean property=* / //将Form中所有参数的值传给accountBean同名的属性值 jsp: declaration String status; /jsp: declaration jsp: scriptlet status = accountBcessRequest(); jsp: scriptlet …… Account.jsp(cont.) form method=POST action=“Account.jsp”BR Account ID INPUT type=text name=id size=8 value=jsp:getProperty name=accountBean property=id / Balance INPUT type=text name=balance size=8 value=jsp:getProperty name=accountBean property=balance / br First Name INPUT type=text name=firstName size=8 value=jsp:getProperty name=accountBean property=firstName / Last Name INPUT type=text name=lastName size=8 Value=jsp:getProperty name=accountBean property=lastName / brbr Account.jsp(cont.) h2bAction :/b/h2 INPUT type=radio name=action value=createCreate INPUT type=radio name=action value=findFind INPUT type=radio name=action value=debitDebit INPUT type=radio name=action value=creditCredit br br Amount INPUT type=text name=amountbr INPUT type=submit name=submit value=Submit /form /FONT/body/html hr h3bStatus :/b/h3 jsp: expression status /jsp: expression /html Java Bean AccountJavaBean.java 属性 action, id, firstname, lastname, balance, amount get/set方法 processRequest()方法 根据传入的参数作相应处理 构造器 Entity Bean对象的初始化位于构造器中： Context ic = new InitialContext(); java.lang.Object objref = ic.lookup(“…EJB); home = (…Home) PortableRemoteObject.narrow(objref, …Ho me.class); AccountJavaBean() public AccountJavaBean() { try { Context ic = new InitialContext(); java.lang.Object objref = ic.lookup(AccountJSPEJB); accountHome = (AccountHome) PortableRemoteObject.narrow(objref, accountHome.class); } catch (Exception re) { re.printStackTrace(); } reset(); //设定各属性值 } reset() private void reset() { System.out.println(Calling reset()); final Stri