马士兵 Servlet & JSP(3.Servlet和JSP的通信)

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[学习笔记]马士兵 Servlet & JSP(3.Servlet和JSP的通信)（1）从JSP调用Servlet可用<jsp:forward>，请求信息自动转到Servlet FromJspToServlet.jsp <html>    <body bgcolor="green">        <!-- Forward to a servlet, 这个servlet存放在web-inf的servlet目录下 -->        <jsp:forward page="/servlet/ServletToJSP" />    </body></html> （2）从Servlet调用JSP可以使用RequestDispatcher接口的forward(req, resp)方法，请求信息需要显示传递 ServletToJSP.java import java.io.IOException; import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse; public class ServletToJSP extends HttpServlet {     protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {                // 设置属性并将它分发给/servlet_jsp/ServletUseJsp.jsp处理        resp.setContentType("text/html;charset=gb2312");        req.setAttribute("servletName", "ServletToJSP");        // RequestDispatcher getRequestDispatcher(String path):        // Returns a RequestDispatcher object that acts as a wrapper for the resource located at the given path.         getServletConfig().getServletContext().getRequestDispatcher("/servlet_jsp/ServletUseJsp.jsp").forward(req, resp);    } } （3）ServletUseJsp.jsp <%@page contentType="text/html;charset=gb2312" %> <html>    <meta context="text/html;charset=gb2312">    <head>        <title>Servlet使用JSP</title>    </head>        <body bgcolor="gray">        <h2>Servlet使用JSP的例子</h2>        <h2>这个页面是被Servlet调用的</h2>    </body></html>   说明：以上相互调用也可以直接使用sendRedirect
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