重定向

html与请求转发一样

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Servelt

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@WebServlet("/hello")
public class Servlet extends javax.servlet.http.HttpServlet {
    protected void doPost(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws javax.servlet.ServletException, IOException {
        String user = request.getParameter("user");
       request.getSession().setAttribute("user",user);
        response.sendRedirect("/Servlet2");
    }
    protected void doGet(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws javax.servlet.ServletException, IOException {
 doPost(request,response);

    }
}

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Servelt2

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@WebServlet("/Servlet2")
public class Servlet2 extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        Object user = request.getSession().getAttribute("user");
        response.getWriter().println(user);
    }

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

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与请求转发不一样的是地址栏显示Servelt2 而且request请求会失效 要换成session才能保存  也就是会话