JavaWeb黑马旅游网-学习笔记04【BaseServlet抽取】

末蓝、 2022-11-04 01:32 103阅读 0赞

>  *  **[Java后端 学习路线 笔记汇总表【黑马程序员】][Java_ _]**
> 
> 1.  [JavaWeb黑马旅游网-学习笔记01【准备工作】][JavaWeb_-_01]
> 2.  [JavaWeb黑马旅游网-学习笔记02【注册功能】][JavaWeb_-_02]
> 3.  [JavaWeb黑马旅游网-学习笔记03【登陆和退出功能】][JavaWeb_-_03]
> 4.  [JavaWeb黑马旅游网-学习笔记04【BaseServlet抽取】][JavaWeb_-_04_BaseServlet]
> 5.  [JavaWeb黑马旅游网-学习笔记05【分类数据展示功能】][JavaWeb_-_05]
> 6.  [JavaWeb黑马旅游网-学习笔记06【旅游线路分页展示分页展示】][JavaWeb_-_06]
> 7.  [JavaWeb黑马旅游网-学习笔记07【旅游线路查询】][JavaWeb_-_07]
> 8.  [JavaWeb黑马旅游网-学习笔记08【旅游线路详情】][JavaWeb_-_08]
> 9.  [JavaWeb黑马旅游网-学习笔记09【旅游线路收藏】][JavaWeb_-_09]
> 10. [JavaWeb黑马旅游网-学习笔记10【项目代码】][JavaWeb_-_10]

**目录**

24-BaseServlet抽取

Idea控制台中文乱码解决

BaseServlet.java

25-BaseServlet抽取\_UserServlet&页面路径改写

UserServlet.java

页面路径改写

header.html

UserServiceImpl发送邮件

查看请求

--------------------

# 24-BaseServlet抽取 #

> ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDk0OTEzNQ_size_16_color_FFFFFF_t_70][] ![20210301123002869.png][]

> **优化servlet目的：**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，相当于在数据库中的一张表对应一个Servlet，在Servlet中提供不同的方法，完成用户的请求。
> 
> ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDk0OTEzNQ_size_16_color_FFFFFF_t_70 1][]

## Idea控制台中文乱码解决 ##

> Idea控制台中文乱码解决：-Dfile.encoding=gb2312
> 
> ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDk0OTEzNQ_size_16_color_FFFFFF_t_70 2][]

## BaseServlet.java ##

> ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDk0OTEzNQ_size_16_color_FFFFFF_t_70 3][]

package cn.itcast.travel.web.servlet;
    
    import com.fasterxml.jackson.core.JsonProcessingException;
    import com.fasterxml.jackson.databind.ObjectMapper;
    
    import javax.servlet.ServletException;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import java.io.IOException;
    import java.lang.reflect.InvocationTargetException;
    import java.lang.reflect.Method;
    
    
    public class BaseServlet extends HttpServlet {
        @Override
        protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
            //System.out.println("baseServlet的service方法被执行了...");
            //完成方法分发
            //1.获取请求路径
            String uri = req.getRequestURI(); //   /travel/user/add
            System.out.println("请求uri:" + uri);//  /travel/user/add
            //2.获取方法名称
            String methodName = uri.substring(uri.lastIndexOf('/') + 1);
            System.out.println("方法名称：" + methodName);
            //3.获取方法对象Method
            //谁调用我？我代表谁。
            System.out.println(this);//UserServlet的对象cn.itcast.travel.web.servlet.UserServlet@4903d97e
            try {
                //获取方法
                Method method = this.getClass().getMethod(methodName, HttpServletRequest.class, HttpServletResponse.class);
                //4.执行方法
                //暴力反射
                //method.setAccessible(true);
                method.invoke(this, req, resp);
            } catch (NoSuchMethodException e) {
                e.printStackTrace();
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            } catch (InvocationTargetException e) {
                e.printStackTrace();
            }
        }
    }

# 25-BaseServlet抽取\_UserServlet&页面路径改写 #

## UserServlet.java ##

> 将之前的Servlet实现的功能，抽取到UserServlet中的不同方法中实现，并且将UserService创建抽取到成员变量位置。
> 
> ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDk0OTEzNQ_size_16_color_FFFFFF_t_70 4][]

package cn.itcast.travel.web.servlet;
    
    import cn.itcast.travel.domain.ResultInfo;
    import cn.itcast.travel.domain.User;
    import cn.itcast.travel.service.UserService;
    import cn.itcast.travel.service.impl.UserServiceImpl;
    import com.fasterxml.jackson.databind.ObjectMapper;
    import org.apache.commons.beanutils.BeanUtils;
    
    import javax.servlet.ServletException;
    import javax.servlet.annotation.WebServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import javax.servlet.http.HttpSession;
    import java.io.IOException;
    import java.lang.reflect.InvocationTargetException;
    import java.util.Map;
    
    @WebServlet("/user/*") // /user/add /user/find
    public class UserServlet extends BaseServlet {
        //声明UserService业务对象
        private UserService service = new UserServiceImpl();
    
        /**
         * 注册功能
         *
         * @param request
         * @param response
         * @throws ServletException
         * @throws IOException
         */
        public void regist(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            //验证校验
            String check = request.getParameter("check");
            //从sesion中获取验证码
            HttpSession session = request.getSession();
            String checkcode_server = (String) session.getAttribute("CHECKCODE_SERVER");
            session.removeAttribute("CHECKCODE_SERVER");//为了保证验证码只能使用一次
            //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对象序列化为json
                ObjectMapper mapper = new ObjectMapper();
                String json = mapper.writeValueAsString(info);
                response.setContentType("application/json;charset=utf-8");
                response.getWriter().write(json);
                return;
            }
            //1.获取数据
            Map<String, String[]> map = request.getParameterMap();
            //2.封装对象
            User user = new User();
            try {
                BeanUtils.populate(user, map);
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            } catch (InvocationTargetException e) {
                e.printStackTrace();
            }
            //3.调用service完成注册
            //UserService service = new UserServiceImpl();
            boolean flag = service.regist(user);
            ResultInfo info = new ResultInfo();
            //4.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对象序列化为json
            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 {
            //1.获取用户名和密码数据
            Map<String, String[]> map = request.getParameterMap();
            //2.封装User对象
            User user = new User();
            try {
                BeanUtils.populate(user, map);
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            } catch (InvocationTargetException e) {
                e.printStackTrace();
            }
            //3.调用Service查询
            //UserService service = new UserServiceImpl();
            User u = service.login(user);
            ResultInfo info = new ResultInfo();
            //4.判断用户对象是否为null
            if (u == null) {
                //用户名密码或错误
                info.setFlag(false);
                info.setErrorMsg("用户名密码或错误！");
            }
            //5.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！");
            }
            //6.判断登录成功
            if (u != null && "Y".equals(u.getStatus())) {
                request.getSession().setAttribute("user", u);//登录成功标记
                //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);*/
            writeValue(user, response);
        }
    
        /**
         * 退出功能
         *
         * @param request
         * @param response
         * @throws ServletException
         * @throws IOException
         */
        public void exit(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            //1.销毁session
            request.getSession().invalidate();
            //2.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 {
            //1.获取激活码
            String code = request.getParameter("code");
            if (code != null) {
                //2.调用service完成激活
                //UserService service = new UserServiceImpl();
                boolean flag = service.active(code);
                //3.判断标记
                String msg = null;
                if (flag) {
                    //激活成功
                    msg = "激活成功，请<a href='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);
            }
        }
    }

## 页面路径改写 ##

### login.html ###

> ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDk0OTEzNQ_size_16_color_FFFFFF_t_70 5][]

### header.html ###

> ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDk0OTEzNQ_size_16_color_FFFFFF_t_70 6][]

### register.html ###

> ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDk0OTEzNQ_size_16_color_FFFFFF_t_70 7][]

### UserServiceImpl发送邮件 ###

> ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDk0OTEzNQ_size_16_color_FFFFFF_t_70 8][]

## 查看请求 ##

> ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDk0OTEzNQ_size_16_color_FFFFFF_t_70 9][]

[Java_ _]: https://blog.csdn.net/weixin_44949135/article/details/113773297
[JavaWeb_-_01]: https://blog.csdn.net/weixin_44949135/article/details/114031199
[JavaWeb_-_02]: https://blog.csdn.net/weixin_44949135/article/details/114121075
[JavaWeb_-_03]: https://blog.csdn.net/weixin_44949135/article/details/114229387
[JavaWeb_-_04_BaseServlet]: https://blog.csdn.net/weixin_44949135/article/details/114259853
[JavaWeb_-_05]: https://blog.csdn.net/weixin_44949135/article/details/114272117
[JavaWeb_-_06]: https://blog.csdn.net/weixin_44949135/article/details/114283166
[JavaWeb_-_07]: https://blog.csdn.net/weixin_44949135/article/details/114288829
[JavaWeb_-_08]: https://blog.csdn.net/weixin_44949135/article/details/114291075
[JavaWeb_-_09]: https://blog.csdn.net/weixin_44949135/article/details/114293637
[JavaWeb_-_10]: https://blog.csdn.net/weixin_44949135/article/details/114305933
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