我想知道可以将自定义servlet逻辑与.jsp模板视图集成.例如,我有以下servlet:
public class MyServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String name = "Mark";
}
}
我想将name变量放在jsp文件(new.jsp)中,如:
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>New</title>
</head>
<body>
<%= name %>
</body>
</html>
我的web.xml:
<servlet>
<servlet-name>MyServlet</servlet-name>
<jsp-file>/new.jsp</jsp-file>
</servlet>
<servlet-mapping>
<servlet-name>MyServlet</servlet-name>
<url-pattern>/new</url-pattern>
</servlet-mapping>
我不想提出name要求.
有帮助吗？
UPDATE
非常感谢,但我仍然遇到麻烦.首先,我更新了我的servlet:
public class MyServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String name = "Mark";
request.setAttribute("name", name);
request.getRequestDispatcher("/WEB-INF/new.jsp").forward(request, response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String name = "Mark";
request.setAttribute("name", name);
request.getRequestDispatcher("/WEB-INF/new.jsp").forward(request, response);
}
}
我也改变了我的看法:
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>New</title>
</head>
<body>
${name}
</body>
</html>
但是当我使用时${name},没有任何显示.我认为我应该导入任何jstl,但不幸的是,如果我使用<%= request.getAttribute("name") %>我正在获取null.
更新2终于解决了!这是我的错,我忘记了
<servlet>
<servlet-name>MyServlet</servlet-name>
<servlet-class>com.example.MyServlet</servlet-class>
</servlet>
您需要实现该doGet()方法.正常的HTTP请求(单击链接,书签或直接在浏览器地址栏中输入URL)默认为GET方法.
为了在预处理servlet中使JSP中的对象可用,您需要将其设置为请求,会话或应用程序范围中的属性.最后,您需要将请求/响应转发给JSP,以便可以显示它.
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String name = "Mark";
request.setAttribute("name", name);
request.getRequestDispatcher("/WEB-INF/new.jsp").forward(request, response);
}
如果修复servlet映射,如下所示
<servlet>
<servlet-name>MyServlet</servlet-name>
<servlet-class>com.example.MyServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>MyServlet</servlet-name>
<url-pattern>/new</url-pattern>
</servlet-mapping>
然后你可以通过http:// localhost:8080/contextname/new来调用servlet .在转发的JSP中,您可以name通过EL 访问
${name}
请注意,JSP放在/WEB-INF文件夹中,以避免直接访问,而无需通过在浏览器地址栏中输入JSP URL来调用预处理servlet.