SimpleBean.java

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package wxy;

public class SimpleBean
{
    private String message;

    public SimpleBean() { ; }

    public void setMessage(String mess) { message = mess; }

    public String getMessage(){ return message; }
}

用合适版本的javac（否则会报错）放到 网站根目录/WEB-INF/class/包路径/ 下

JavaBean.jsp

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<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ page import="wxy.*" %>
<jsp:useBean id="t1" scope="session" class="wxy.SimpleBean" />
<jsp:setProperty name="t1" property="message" value="hhh" />
<jsp:getProperty name="t1" property="message" />

修改 class 文件，需要重启Tomcat