在JSP中使用JavaBean的异常

Question

我解决不了这个问题，你能帮帮我吗？

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!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>Insert title here</title>
</head>
<body>

<jsp:useBean id="musteri" class="beanler.MusteriBean" scope="request" ></jsp:useBean>

<%musteri.setIsim("Ferid");%>
<%=musteri.getIsim() %>
</body>
</html>

异常: Servlet.service()用于servlet，在带有路径/Servlet_Projesi的上下文中抛出异常/beanTest.jsp (行: 11，列: 0) useBean类属性beanler.MusteriBean的值无效。对于根原因org.apache.jasper.JasperException: /beanTest.jsp (行: 11，列: 0)，useBean类属性beanler.MusteriBean的值无效。

package beanler;

public class MusteriBean {
    private String isim;
    private String soyad;

    public String getIsim() {
        return isim;
    }
    public void setIsim(String isim) {
        this.isim = isim;
    }
    public String getSoyad() {
        return soyad;
    }
    public void setSoyad(String soyad) {
        this.soyad = soyad;
    }
}

​

​

Answer 1

尝试使用<jsp:setProperty>设置属性

<jsp:useBean id="musteri" class="beanler.MusteriBean" scope="request" >
<jsp:setProperty name="musteri" property="isim" value=" Ferid" />
</jsp:useBean>

显示时可以使用<%=musteri.getIsim() %>

Answer 2

两点你可以试一试。

初始化类属性，如

private String isim = null;
private String soyad = null;

2实现可序列化的类似

public class MusteriBean implements java.io.Serializable

Answer 3

我还找到了另一个解决办法。

<jsp:useBean id="musteri" class="beanler.MusteriBean" scope="request" ></jsp:useBean>

我把它改成：

<jsp:useBean id="musteri" class="beanler.MusteriBean" scope="request" />

这很管用..。