从 JSP 调用 Java 方法时出现内部服务器错误

Question

这是我的JSP

extra.jsp:

<%@taglib uri="http://struts.apache.org/tags-bean" prefix="bean"%>
<html>
<head>
</head>
<body>
<h1><bean:write name="HelloWorldForm" property="message">
</h1>
</body>
</html>

这个表单Bean

HelloWorldForm.java:

package com.redhat.rhn.frontend.action.common;
import org.apache.struts.action.ActionForm;
public class HelloWorldForm extends ActionForm{
    String message="HelloWorld!";
    public String getMessage() {
            return message;
    }
    public void setMessage(String message) {
            this.message = message;
    }
}

这是行动

HelloWorldAction.java:

package com.redhat.rhn.frontend.action;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

import com.redhat.rhn.frontend.action.common.HelloWorldForm;

public class HelloWorldAction extends Action{
    public ActionForward execute(ActionMapping mapping,ActionForm form,
            HttpServletRequest request,HttpServletResponse response)
    throws Exception {
            HelloWorldForm HelloWorldForm = (HelloWorldForm) form;
            HelloWorldForm.setMessage("Hello World! Struts");      
            return mapping.findForward("success");
    }
}

我在 struts-config 文件中添加了以下代码

struts-config.xml:

<form-bean name="HelloWorldForm"
        type="com.redhat.rhn.frontend.common.HelloWorldForm">
</form-bean>


<action path="/extra"
scope="request"
name="HelloWorldForm"
type="com.redhat.rhn.frontend.action.HelloWorldAction">
<forward name="success" path="/WEB-INF/pages/extra.jsp" />
</action>

当我尝试从浏览器访问 extra.jsp 时出现内部服务器错误打印 hello world 的目的是了解如何从 jsp

调用 java 方法

Answer 1

错误代码500是jasper编译器在编译JSP页面时产生的错误

标签

<bean:write name="HelloWorldForm" property="message">

未关闭，编译器将导致错误，状态代码为 500

从 JSP 调用 Java 方法时出现内部服务器错误

Internal Server error while calling an Java method from JSP

java

jsp

struts

servlets

struts-config