不要在JSP中这样做。创建一个真正的Java类,如果需要Javabean的味道。
public class Father {
private static int count = 0;
public void incrementCount() {
count++;
}
public int getCount() {
return count;
}
}
,并使用一个Servlet类来完成业务任务:
public class FatherServlet extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
Father father1 = new Father();
Father father2 = new Father();
father1.incrementCount();
request.setAttribute("father2", father2); // Will be available in JSP as ${father2}
request.getRequestDispatcher("/WEB-INF/father.jsp").forward(request, response);
}
}
您在web.xml
图如下:
<servlet>
<servlet-name>fatherServlet</servlet-name>
<servlet-class>com.example.FatherServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>fatherServlet</servlet-name>
<url-pattern>/father</url-pattern>
</servlet-mapping>
,并创建/WEB-INF/father.jsp
如下:
<!doctype html>
<html lang="en">
<head>
<title>SO question 2595687</title>
</head>
<body>
<p>${father2.count}
</body>
</html>
并通过http://localhost:8080/contextname/father
调用FatherServlet
。 ${father2.count}
将显示返回值father2.getCount()
。
要了解有关正确编程JSP/Servlet的更多信息,我建议您通过those tutorials或this book。祝你好运。