- SecondServlet
- request.setAttribute("lover", "tom");
- request.getSession().setAttribute("lovered", "joe");
-
- request.getRequestDispatcher("/third?name=jay").forward(request, response);
- 或
- request.getRequestDispatcher("third?name=jay").forward(request, response);
- 或
- this.getServletContext().getRequestDispatcher("/third?name=jay").forward(request, response);
-
- ThirdServlet
- PrintWriter out = response.getWriter();
- String name = request.getParameter("name");
- out.println(request.getContextPath()+"<hr/>");
- out.println("name="+name+"<hr/>");
- out.println("lover="+request.getAttribute("lover")+"<hr/>");
- out.println("lovered="+request.getSession().getAttribute("lovered")+"<hr/>");
-
结果显示，地址栏信息仍为http://localhost:8080/Test/second，这三种方式都可以传值到第二个Servlet。
2.sendRedirect只能用response调用，可以用相对路径（直接用），也可以用相对路径（需加应用路径）
- SecondServlet
- request.setAttribute("lover", "tom");
- request.getSession().setAttribute("lovered", "joe");
-
- response.sendRedirect("third?name=jay");
- 或
- response.sendRedirect(request.getContextPath()+"/third?name=jay");
-
- ThirdServlet
- PrintWriter out = response.getWriter();
- String name = request.getParameter("name");
- out.println(request.getContextPath()+"<hr/>");
- out.println("name="+name+"<hr/>");
- out.println("lover="+request.getAttribute("lover")+"<hr/>");
- out.println("lovered="+request.getSession().getAttribute("lovered")+"<hr/>");
-
结果显示，地址栏信息变为http://localhost:8080/Test/third?name=jay，只有request.getAttribute("lover")获取不到值，session范围及url路径后的传值在第二个Servlet都可以获取到值。
- response.sendRedirect("http://www.baidu.com");
