I'；在JSP中引用JavaBean时出现以下错误..useBean类属性Controller.SampleBean的值无效_Java_Jsp_Servlets

I'；在JSP中引用JavaBean时出现以下错误..useBean类属性Controller.SampleBean的值无效

java jsp servlets

I'；在JSP中引用JavaBean时出现以下错误..useBean类属性Controller.SampleBean的值无效,java,jsp,servlets,Java,Jsp,Servlets,不知何故，JavaBean没有在home.jsp中被引用严重：Servlet jsp的Servlet.service（）引发异常 org.apache.jasper.JasperException:/home.jsp（第13行，第0列） useBean类属性Controller.SampleBean的值为无效 home.jsp <%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEnc

不知何故，JavaBean没有在home.jsp中被引用

严重：Servlet jsp的Servlet.service（）引发异常 org.apache.jasper.JasperException:/home.jsp（第13行，第0列） useBean类属性Controller.SampleBean的值为无效

home.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
    <%@ page import="java.util.*" %>
<%--     <%@taglib uri="http://java.sun.com/jstl/core" prefix="c"%> --%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Home Page</title>
</head>
<body>
<jsp:useBean id="emps" class="Controller.SampleBean" scope="request">
<jsp:setProperty name="emps" property="id" value ="1"/>
<jsp:setProperty name="emps" property="name" value ="Sagar"/>
<p>Emp id is <jsp:getProperty name="emps" property="id" /></p>
<p>Emp name is <jsp:getProperty name="emps" property="name" /></p>
</jsp:useBean>

<% Date d = new Date();%>
<%=d %>

<% %>
</body>
</html>

下面是servlet类

类文件

SampleBean

应位于

WEBINF/classes/Controller

下

并且应该具有默认（零）参数构造函数，该构造函数应该是

public

参考：

类文件

SampleBean

应位于

WEBINF/classes/Controller

下，并且应具有默认构造函数，该构造函数应为

public

。。

package Controller;

public class SampleBean {

    private int id;
    private String name;

    public SampleBean(int id, String name) {
        this.id = id;
        this.name = name;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    package Controller;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class MyServlet
 */
@WebServlet("/MyServlet")
public class MyServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#HttpServlet()
     */
    public MyServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        request.getRequestDispatcher("/home.jsp").forward(request, response);
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
    }

}

}