7.05.2 Servlet返回动态页面与jsp

//获取contentpath<br />//        String contextPath = req.getContextPath();<br />//              重定向<br />//        resp.sendRedirect(contextPath + "/" + "success.html");<br />    }<br />案例:

@WebServlet("/login")
public class UserResponse extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        req.setCharacterEncoding("utf-8");
        String username = req.getParameter("username");
        String password = req.getParameter("password");
        //去数据库里查询用户和密码是否合法
        //...省略一些代码
        resp.setContentType("text/html;charset=utf-8");
        //合法
//        resp.getWriter().write("欢迎" + username);
        req.setAttribute("username", username);
        String flag = "2";
//        req.setAttribute("flag", flag);
        String sex = "男";
        if (flag == "2") {
            sex = "女";
        }
        req.setAttribute("sex", sex);
//数据库中查出来的的所有用户的名称集合
//        List<String> nameList = new ArrayList<>();
//        nameList.add("张三");
//        nameList.add("李四");
//        req.setAttribute("nameList", nameList);
        List<Student> students = new ArrayList<>();
        Student student = new Student();
        student.setName("张三");
        student.setAge(80);
        student.setHeight(2);
        student.setHobby("打牌");
        student.setLevel("5");
        students.add(student);
        Student student2 = new Student();
        student2.setName("张三2");
        student2.setAge(802);
        student2.setHeight(22);
        student2.setHobby("打牌2");
        student2.setLevel("52");
        students.add(student2);
        req.setAttribute("studentList", students);
   req.getRequestDispatcher("/success.jsp").forward(req,resp);
        //获取contentpath
//        String contextPath = req.getContextPath();
//              重定向
//        resp.sendRedirect(contextPath + "/" + "success.html");
    }
}