《黑马旅游网》综合案例六 BaseServlet 抽取

BaseServlet抽取

减少Servlet的数量，现在是一个功能一个Servlet，将其优化为一个模块一个Servlet，

相当于在数据库中一张表对应一个Servlet,在Servlet中提供不同的方法，完成用户的请求。

BaseServlet：

public class BaseServlet extends HttpServlet {

    @Override

    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        //完成方法分发

        //1.获取请求路径

        String uri = req.getRequestURI();

        System.out.println("请求uri:"+uri);

        //获取方法名称

        String methodName = uri.substring(uri.lastIndexOf('/') + 1);

        System.out.println("方法名称:"+methodName);

        //获取方法对象Method

        //this:谁调用我？我代表谁

        try {

            //获取方法

            Method method=this.getClass().getMethod(methodName,HttpServletRequest.class,HttpServletResponse.class);

            //执行方法

            method.invoke(this,req,resp);

        } catch (NoSuchMethodException e) {

            e.printStackTrace();

        } catch (IllegalAccessException e) {

            e.printStackTrace();

        } catch (InvocationTargetException e) {

            e.printStackTrace();

        }

    }

}

UserServlet：测试

@WebServlet("/user/*")

public class UserServlet extends BaseServlet {

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

        System.out.println("add...");

    }

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

        System.out.println("find...");

    }

}

访问：

控制台：

UserServlet：把上面写的Servlet全部写到UserServlet这个方法中，复制过来就行

@WebServlet("/user/*")

public class UserServlet extends BaseServlet {

    //声明一个UserService业务对象

    private UserServiceImpl service = new UserServiceImpl();

    /**

     * 注册功能

     * @param request

     * @param response

     * @throws ServletException

     * @throws IOException

     */

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

        //验证码的校验

        String check = request.getParameter("check");

        //从session中获取验证码

        HttpSession session = request.getSession();

        String checkcode_server = (String) session.getAttribute("CHECKCODE_SERVER");

        session.removeAttribute("CHECKCODE_SERVER");//保证验证码只使用一次

        //比较

        if (checkcode_server==null || !checkcode_server.equalsIgnoreCase(check)){

            //验证码错误

            ResultInfo info = new ResultInfo();

            //注册失败

            info.setFlag(false);

            info.setErrorMsg("验证码错误!");

            //将info对象序列化json并且写回客户端

            ObjectMapper mapper = new ObjectMapper();

            String json = mapper.writeValueAsString(info);

            //将json数据写回客户端

            //设置content-type

            response.setContentType("application/json;charset=utf-8");

            response.getWriter().write(json);

            return;

        }

        //获取数据

        Map<String, String[]> map = request.getParameterMap();

        //封装对象

        User user = new User();

        try {

            BeanUtils.populate(user,map);

        } catch (IllegalAccessException e) {

            e.printStackTrace();

        } catch (InvocationTargetException e) {

            e.printStackTrace();

        }

        //调用service完成注册

        //UserServiceImpl service = new UserServiceImpl();

        boolean flag = service.regist(user);

        ResultInfo info = new ResultInfo();

        //响应结果

        if (flag){

            //注册成功

            info.setFlag(true);

        }else {

            //注册失败

            info.setFlag(false);

            info.setErrorMsg("注册失败!");

        }

        //将info对象序列化json并且写回客户端

        ObjectMapper mapper = new ObjectMapper();

        String json = mapper.writeValueAsString(info);

        //将json数据写回客户端

        //设置content-type

        response.setContentType("application/json;charset=utf-8");

        response.getWriter().write(json);

    }

    /**

     * 登录功能

     * @param request

     * @param response

     * @throws ServletException

     * @throws IOException

     */

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

        //验证码的校验

        String check = request.getParameter("check");

        //从session中获取验证码

        HttpSession session = request.getSession();

        String checkcode_server = (String) session.getAttribute("CHECKCODE_SERVER");

        session.removeAttribute("CHECKCODE_SERVER");//保证验证码只使用一次

        //比较

        if (checkcode_server==null || !checkcode_server.equalsIgnoreCase(check)){

            //验证码错误

            ResultInfo info = new ResultInfo();

            //注册失败

            info.setFlag(false);

            info.setErrorMsg("验证码错误!");

            //将info对象序列化json并且写回客户端

            ObjectMapper mapper = new ObjectMapper();

            String json = mapper.writeValueAsString(info);

            //将json数据写回客户端

            //设置content-type

            response.setContentType("application/json;charset=utf-8");

            response.getWriter().write(json);

            return;

        }

        //获取用户名和密码数据

        Map<String, String[]> map = request.getParameterMap();

        //封装user对象

        User user = new User();

        try {

            BeanUtils.populate(user,map);

        } catch (IllegalAccessException e) {

            e.printStackTrace();

        } catch (InvocationTargetException e) {

            e.printStackTrace();

        }

        //调用Service查询

        //UserServiceImpl service = new UserServiceImpl();

        User u = service.login(user);

        request.getSession().setAttribute("user",u);

        ResultInfo info = new ResultInfo();

        //判断用户对象是否为null

        if (u==null){

            //用户名或密码错误

            info.setFlag(false);

            info.setErrorMsg("用户名或密码错误");

        }

        //判断用户是否激活

        if (u!=null && !"Y".equals(u.getStatus())){

            //用户尚未激活

            info.setFlag(false);

            info.setErrorMsg("您尚未激活，请激活");

        }

        //判断登录成功

        if (u!=null && "Y".equals(u.getStatus())){

            //登录成功

            info.setFlag(true);

        }

        //响应数据

        ObjectMapper mapper = new ObjectMapper();

        response.setContentType("application/json;charset=utf-8");

        mapper.writeValue(response.getOutputStream(),info);

    }

    /**

     * 查询单个对象

     * @param request

     * @param response

     * @throws ServletException

     * @throws IOException

     */

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

        //从session中获取登录用户

        Object user = request.getSession().getAttribute("user");

        //将user写回客户端

        ObjectMapper mapper = new ObjectMapper();

        response.setContentType("application/json;charset=utf-8");

        mapper.writeValue(response.getOutputStream(),user);

    }

    /**

     * 退出功能

     * @param request

     * @param response

     * @throws ServletException

     * @throws IOException

     */

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

        //销毁session

        request.getSession().invalidate();

        //跳转登录页面

        response.sendRedirect(request.getContextPath()+"/login.html");

    }

    /**

     * 激活功能

     * @param request

     * @param response

     * @throws ServletException

     * @throws IOException

     */

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

        //判断激活码

        String code = request.getParameter("code");

        if (code!=null){

            //调用service完成激活

            //UserServiceImpl service = new UserServiceImpl();

            boolean flag = service.active(code);

            //判断标记

            String msg = null;

            if (flag){

                //激活成功

                msg = "激活成功，请<a href='/travel/login.html'>登录</a>";

            }else {

                //激活失败

                msg = "激活失败，请联系管理员！";

            }

            response.setContentType("text/html;charset=utf-8");

            response.getWriter().write(msg);

        }

    }

}

header.html：

UserServiceImpl：regist方法中的路径

优化完成

巴特西

《黑马旅游网》综合案例六 BaseServlet 抽取

BaseServlet抽取

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