一个简单的注册 反射（写在servlet中）

 

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

        try{
            request.setCharacterEncoding("Utf-8");
            response.setCharacterEncoding("utf-8");
            response.setContentType("text/html");
            PrintWriter out = response.getWriter();
            
            String nstr = request.getParameter("name");
            String pstr = request.getParameter("pwd");
            
            /*********开始反射机制***********************************************************************************/
            //1. 根据包创建类
            Class<?> c = Class.forName("entity.User");            
            //2. 根据类创建对象
            User obj = (User) c.newInstance();
            //3. 找到该对象的所有方法
            Method[] methods = obj.getClass().getDeclaredMethods();
            
            //4. 创建StringBuffer对象将 对象属性封装成 Jeson格式
            StringBuffer sb = new StringBuffer();            
            sb.append("{");
            for( Method method : methods) {
                if( method.getName().startsWith("get")) {
                    Object o = method.invoke(obj);
                    sb.append(" \" "+method.getName().replaceAll("get", "")+" \" ");
                    sb.append(":");
                    sb.append(" \" "+o+" \" ");
                    sb.append(",");
                }

            }
            sb.deleteCharAt(sb.length()-1);
            sb.append("}");
            
            //5. 判断方法，进行操作为属性赋值
            for( Method method : methods ) {
                if( method.getName().equals("setName")) {
                    method.invoke(obj, nstr);
                }
                if( method.getName().equals("setPwd")) {
                    method.invoke(obj, pstr);
                }
            }
            /*******************以上反射部分到此结束***********下边是正常的业务交互**************************************/
            //6. 与service层进行业务
            IUserService service = new UserServiceImpl();
            int result = service.returnRegisterResult(obj);
            if( result ==1 ){
                 request.getRequestDispatcher("page/LoginSuccess.jsp").forward(request, response);
            } else {
                out.println("<script>");
                out.println("alert('用户名或密码错误！');");
                out.println("location='" + request.getContextPath() + "/page/Register.jsp'");
                out.println("</script>");
            }
    }catch(Exception e){
        e.printStackTrace();
    }
}