Response_重定向的代码实现以及特点

Response_重定向的代码实现以及特点

重定向：资源跳转的方式

@WebServlet(name = "ResponseDemo1", value = "/ResponseDemo1")
public class ResponseDemo1 extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        System.out.println("demo1...");

        //访问/ResponseDemo1，会自动跳转到/ResponseDemo2资源
        //1.设置状态码为302
//        response.setStatus(302);
//        //2.设置响应头location
//        response.setHeader("location", "/ResponseDemo2");

        //简单的重定向
        response.sendRedirect("/ResponseDemo2");
    }
}

@WebServlet(name = "ResponseDemo2", value = "/ResponseDemo2")
public class ResponseDemo2 extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        System.out.println("demo222222...");
    }
}

重定向特点：

　　1.地址栏发送变化

　　2.重定向可以访问其他站点(服务器)的资源

　　3.重定向是两次请求

转发的特点：

　　1.转发地址栏路径不变

　　2.转发只能访问当前服务器下的资源

　　3.转发只是一次请求