RequestDispatcher接口include方法

原文地址： RequestDispatcher接口include方法

web.xml:

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">    

    <servlet>
        <servlet-name>IncludedServlet</servlet-name>
        <servlet-class>com.RequestDispatcher.IncludedServlet</servlet-class>
    </servlet>

    <servlet-mapping>
        <servlet-name>IncludedServlet</servlet-name>
        <url-pattern>/IncludedServlet</url-pattern>
    </servlet-mapping>

    <servlet>
        <servlet-name>IncludingServlet</servlet-name>
        <servlet-class>com.RequestDispatcher.IncludingServlet</servlet-class>
    </servlet>

    <servlet-mapping>
        <servlet-name>IncludingServlet</servlet-name>
        <url-pattern>/IncludingServlet</url-pattern>
    </servlet-mapping>

</web-app>

IncludingServlet.java:

public class IncludingServlet extends HttpServlet {

    public void doGet(HttpServletRequest request,
                      HttpServletResponse response)
            throws ServletException, IOException {

        response.setContentType("text/html;charset=utf-8");

        PrintWriter out=response.getWriter();
        RequestDispatcher dispatcher=request.getRequestDispatcher("/IncludedServlet?pl=abc");
        out.println("before including"+"<br>");
        dispatcher.include(request,response);
        out.println("after including");
    }
    public void doPost(HttpServletRequest request,
                       HttpServletResponse response)
            throws ServletException,IOException{
        this.doGet(request,response);
    }
}

IncludedServlet.java:

public class IncludedServlet extends HttpServlet {

    public void doGet(HttpServletRequest request,
                      HttpServletResponse response)
            throws ServletException, IOException {

        response.setContentType("text/html;charset=utf-8");
        response.setCharacterEncoding("utf-8");
        PrintWriter out=response.getWriter();
        out.println("中国"+"<br>");
        out.println("URI:"+request.getRequestURI()+"<br>");
        out.println("QueryString:"+request.getQueryString()+"<br>");
        out.println("parameter pl"+request.getParameter("pl")+"<br>");

    }
    public void doPost(HttpServletRequest request,
                       HttpServletResponse response)
            throws ServletException,IOException{
        this.doGet(request,response);
    }
}