农业网站开发,免费建网站广告语,杭州市建设网官网,如何做优惠券网站文章目录 一、服务器内部转发#xff1a;request.getRequestDispatcher(...).forward(request, response);二、客户端重定向#xff1a;response.sendRedirect();三、服务器内部转发代码示例四、客户端重定向代码示例 一、服务器内部转发#xff1a… 文章目录 一、服务器内部转发request.getRequestDispatcher(...).forward(request, response);二、客户端重定向response.sendRedirect(×××);三、服务器内部转发代码示例四、客户端重定向代码示例 一、服务器内部转发request.getRequestDispatcher(“…”).forward(request, response);
一次请求响应的过程对于客户端而言内部经过了多少次转发客户端是不知道的。地址栏中的URL是不会变化的。
内部经过3、4次跳转都是一次请求响应。如图所示 二、客户端重定向response.sendRedirect(“×××”);
两次请求响应的过程。客户端肯定知道请求URL有变化。如图所示 三、服务器内部转发代码示例
服务器内部转发证明可通过代码断点调试
Demo06Servlet.java
// 演示服务器端内部转发
public class Demo06Servlet extends HttpServlet {Overrideprotected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {System.out.println(demo06....);// 服务器端内部转发request.getRequestDispatcher(demo07).forward(request, response);}
}Demo07Servlet.java
public class Demo07Servlet extends HttpServlet {Overrideprotected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {System.out.println(demo07....);}
}web.xml
servletservlet-nameDemo06Servlet/servlet-nameservlet-classcom.atguigu.servlets.Demo06Servlet/servlet-class
/servlet
servlet-mappingservlet-nameDemo06Servlet/servlet-nameurl-pattern/demo06/url-pattern
/servlet-mappingservletservlet-nameDemo07Servlet/servlet-nameservlet-classcom.atguigu.servlets.Demo07Servlet/servlet-class
/servlet
servlet-mappingservlet-nameDemo07Servlet/servlet-nameurl-pattern/demo07/url-pattern
/servlet-mapping四、客户端重定向代码示例
Demo06Servlet.java
// 演示服务器端内部转发以及客户端重定向
public class Demo06Servlet extends HttpServlet {Overrideprotected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {System.out.println(demo06....);// 客户端重定向response.sendRedirect(demo07);}
}Demo07Servlet.java
public class Demo07Servlet extends HttpServlet {Overrideprotected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {System.out.println(demo07....);}
}web.xml
servlet-mappingservlet-nameDemo06Servlet/servlet-nameurl-pattern/demo06/url-pattern
/servlet-mappingservletservlet-nameDemo07Servlet/servlet-nameservlet-classcom.atguigu.servlets.Demo07Servlet/servlet-class
/servlet
servlet-mappingservlet-nameDemo07Servlet/servlet-nameurl-pattern/demo07/url-pattern
/servlet-mapping访问demo06一敲回车可以发现它发送了两次请求
点击demo06的请求可以发现状态码为302重定向Location也变成了demo07 demo07的状态码则是200
