Question

我有一个servlet调度程序

当我使用无论如何传递价值时，我总是失败。

这是我的错误消息

javax.servlet.ServletException: Servlet execution threw an exception
    servlet.checkServlet.doPost(checkServlet.java:19)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
java.lang.StackOverflowError
    org.apache.catalina.connector.Request.notifyAttributeAssigned(Request.java:1489)
    org.apache.catalina.connector.Request.setAttribute(Request.java:1475)
    org.apache.catalina.connector.RequestFacade.setAttribute(RequestFacade.java:539)
    servlet.checkServlet.doPost(checkServlet.java:18)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
    servlet.checkServlet.doPost(checkServlet.java:19)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:729)

的web.xml

<web-app>
    <servlet>
        <servlet-name>checkServlet</servlet-name>
        <servlet-class>checkServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>checkServlet</servlet-name>
          <http-method>Get</http-method>
          <http-method>Post</http-method>
        <url-pattern>/checkview.jsp</url-pattern>
    </servlet-mapping>
</web-app>

servlet.java

public class checkServlet extends HttpServlet {
   protected void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
    request.setAttribute("books", "book1"); 
    request.getRequestDispatcher("/checkview.jsp") .include(request,response); 
    }
}

最后是我的jsp

<%@ page language="java" contentType="text/html;charset=UTF-8" %>
<% String msg = (String)request.getAttribute("book"); %>
<!doctype html>

<html lang="en">
<head>
</head>
<body>
form servlet： <%= msg %>
</body>
</html>

有没有人可以教我如何修复以及为什么会出现这个问题？

如何将值从servlet传递给jsp

0 个答案: