如何在jsp页面加载时调用servlet [英] How to call servlet on jsp page load
问题描述
我想在加载 index.jsp 页面时调用servlet latest_products 。这个servlet在List中有记录。我想将此列表< products> 传递给 index.jsp 。但我不想在url中显示servlet的名称。有什么方法可以做到这一点。
I want to call a servlet latest_products on load of index.jsp page.This servlet has records in List. I want to pass this List<products> to index.jsp. But I don't want to display the name of servlet in url. Is there any way by which I can do this.
推荐答案
解决方案1
要遵循的步骤：
Solution 1
Steps to follow:
- 使用
jsp：include来调用Servlet来自JSP的JSP将在运行时包含Servlet在JSP中的响应 - 在Servlet中设置请求中的属性，然后在JSP中读取它
- use
jsp:includeto call the Servlet from the JSP that will include the response of the Servlet in the JSP at runtime - set the attribute in the request in Servlet and then simply read it in JSP
示例代码：
JSP：
<body>
<jsp:include page="/latest_products.jsp" />
<c:out value="${message }"></c:out>
</body>
Servlet：
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setAttribute("message", "hello");
}
编辑
EDIT
但我不想在url中显示servlet的名称。
but i don't want to display the name of servlet in url.
只需定义一个不同的和对于 web.xml 中的Servlet，有意义的 url-pattern ，如下所示，看起来像JSP页面但是在内部，它是一个Servlet。
Simply define a different and meaningful url-pattern for the Servlet in the web.xml such as as shown below that look like a JSP page but internally it's a Servlet.
web.xml：
<servlet>
<servlet-name>LatestProductsServlet</servlet-name>
<servlet-class>com.x.y.LatestProductsServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>LatestProductsServlet</servlet-name>
<url-pattern>/latest_products.jsp</url-pattern>
</servlet-mapping>
解决方案2
要遵循的步骤：
Solution 2
Steps to follow:
- 首次致电Servlet
- 处理最新产品
- 在请求属性中设置列表
- 将请求转发到JSP，使用JSTL可以在JSP中轻松访问它
- first call to the the Servlet
- process the latest products
- set the list in the request attribute
- forward the request to the JSP where it can be accessed easily in JSP using JSTL
示例代码：
Servlet：
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setAttribute("message", "hello");
RequestDispatcher view=request.getRequestDispatcher("index.jsp");
view.forward(request,response);
}
index.jsp：
index.jsp:
<body>
<c:out value="${message }"></c:out>
</body>
点击URL： scheme：// domain：port / latest_products.jsp 将调用Servlet的 doGet（）方法。
hit the URL: scheme://domain:port/latest_products.jsp that will call the Servlet's doGet() method.
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