jsp servlet框架参数传递及控制器转发，重定向代码 全新时代

场景描述：根据URL传递来的参数，请求的jsp页面获取参数值，http://localhost:8083/myJsp.jsp?mid=1020

http://localhost:8083/myJsp?mid=1020(请求servlet)

jsp脚本标记<%%>

jsp输出标记<%=输出内容%> <% out.println("输出内容");%>

MyJsp.jsp jsp页面获取参数值并输出：

<%
    	String mid = request.getParameter("mid"); //可以获取getAttribute值。
    	out.println("mid:" + mid);
     %>
     
     <%
    	//String mid2 = (String)request.getAttribute("mid");
    	//out.println("mid2:" + mid2);
     %>

 MyJsp.java servlet获取参数并转发

public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		
		String mid = request.getParameter("mid");
		System.out.println("mid:" +  mid);
		request.setAttribute("mid", mid);
		
		//转发
		RequestDispatcher rd = this.getServletContext().getRequestDispatcher("/MyJsp.jsp");
		rd.forward(request, response);
		
		//重定向
//		response.sendRedirect("/MyJsp.jsp");
		
	}

web.xml

<servlet>
	    <servlet-name>MyJsp</servlet-name>
	    <servlet-class>com.sms.test.MyJsp</servlet-class>
	  </servlet>
	
	  <servlet-mapping>
	    <servlet-name>MyJsp</servlet-name>
	    <url-pattern>/MyJsp</url-pattern>
	  </servlet-mapping>