然而，尝试使用 jsp 与 bean 交互时，在运行它时会出现一些错误。
这是我在浏览器中看到的错误
生成的 servlet 错误：[javac] C:\Sun\AppServerNew\domains\domain1\generated\jsp\j2ee-apps\ConverterApp\war-ic_war\org\apache\jsp\index_jsp.java:21：未报告的异常 javax.naming。命名异常；必须被捕获或声明被抛出 [javac] InitialContext ic = new InitialContext(); ^
生成的 servlet 错误：[javac] C:\Sun\AppServerNew\domains\domain1\generated\jsp\j2ee-apps\ConverterApp\war-ic_war\org\apache\jsp\index_jsp.java:22：未报告的异常 javax.naming。命名异常；必须被捕获或声明被抛出 [javac] Object objRef = ic.lookup("java:comp/env/ejb/Converter"); ^
生成的 servlet 错误：[javac] C:\Sun\AppServerNew\domains\domain1\generated\jsp\j2ee-apps\ConverterApp\war-ic_war\org\apache\jsp\index_jsp.java:24：未报告的异常 javax.ejb。创建异常；必须被捕获或声明被抛出 [javac] converter = home.create();
索引.jsp
<%@ page import="converter.Converter, converter.ConverterHome, java.math.*, javax.ejb.*, javax.naming.*,
javax.rmi.PortableRemoteObject, java.rmi.RemoteException" %>
<%!
private Converter converter = null;
public void jspInit() {
try {
InitialContext ic = new InitialContext();
Object objRef = ic.lookup("java:comp/env/ejb/Converter");
ConverterHome home = (ConverterHome)PortableRemoteObject.narrow(objRef, ConverterHome.class);
converter = home.create();
} catch (RemoteException ex) {
}
}
%>
<html>
<head>
<title>Converter</title>
</head>
<body bgcolor="white">
<h1><center>Converter</center></h1>
<hr>
<p>Enter an amount to convert:</p>
<form method="get">
<input type="text" name="amount" size="25">
<br>
<p>
<input type="submit" value="Submit">
<input type="reset" value="Reset">
</form>
<%
String amount = request.getParameter("amount");
if ( amount != null && amount.length() > 0 ) {
BigDecimal d = new BigDecimal (amount);
%>
<p><%= amount %> dollars are
<%= converter.dollarToYen(d) %> Yen.
<p><%= amount %> Yen are
<%= converter.yenToEuro(d) %> Euro.
<%
}
%>
</body>
</html>
转换器豆
package converter;
import javax.ejb.*;
import java.math.*;
import java.rmi.*;
public class ConverterBean implements SessionBean {
BigDecimal yenRate = new BigDecimal("122.00");
BigDecimal euroRate = new BigDecimal("0.0077");
public BigDecimal dollarToYen(BigDecimal dollars) {
BigDecimal result = dollars.multiply(yenRate);
return result.setScale(2, BigDecimal.ROUND_UP);
}
public BigDecimal yenToEuro(BigDecimal yen) {
BigDecimal result = yen.multiply(euroRate);
return result.setScale(2, BigDecimal.ROUND_UP);
}
public void ejbActivate(){}
public void ejbPassivate(){}
public void ejbRemove(){}
public void ejbCreate(){}
public void setSessionContext(SessionContext ctx){}
}
转换器主页
package converter;
import java.rmi.RemoteException;
import javax.ejb.*;
public interface ConverterHome extends EJBHome {
Converter create() throws CreateException, RemoteException;
}
转换器
package converter;
import java.rmi.RemoteException;
import javax.ejb.*;
import java.math.*;
public interface Converter extends EJBObject{
public BigDecimal dollarToYen(BigDecimal dollars)
throws RemoteException;
public BigDecimal yenToEuro(BigDecimal dollars)
throws RemoteException;
}