请求转发，重定向

原创

AomanHao 2023-04-12 09:35:23 ©著作权

文章标签 重定向请求转发 html 文章分类 HarmonyOS 后端开发

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servlet中调用转发、重定向的语句：
request.getRequestDispatcher(“new.jsp”).forward(request, response);//转发到new.jsp
response.sendRedirect(“new.jsp”);//重定向到new.jsp

在jsp页面中你也会看到通过下面的方式实现转发：

当然也可以在jsp页面中实现重定向：
<%response.sendRedirect(“new.jsp”);//重定向到new.jsp%>

重定向：

public class ServletRedirect extends HttpServlet {
    private static final long serialVersionUID = 1L;
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //重定向
        response.sendRedirect("/Web09-/Demo1.html");

        //传递参数
        request.setAttribute("Rong", "rong");
        response.sendRedirect("/Web09-/ServletCookie/GetDataDemo");
        System.out.println("重定向参数保存！");
    }

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

}

请求转发：

public class QingQiuzf extends HttpServlet {
    private static final long serialVersionUID = 1L;

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //创建context对象
        ServletContext context = this.getServletContext();

        //使用请求转发方法
        //RequestDispatcher getRequestDispatcher(String path);
        RequestDispatcher rd = context.getRequestDispatcher("Demo1.html");

        //使用forward方法封装 request和response
//      rd.forward(request, response);

        request.getRequestDispatcher("/Demo1.html").forward(request, response);
    }

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

        doGet(request, response);
    }

}