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旅游网项目2

2019-11-28 20:00:53  阅读：235  来源： 互联网

标签：itcast cn 项目 travel 旅游网 import servlet response


7.优化Servlet

7.1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。

 

Idea控制台中文乱码解决：-Dfile.encoding=gb2312

 

7.2BaseServlet编写

package cn.itcast.travel.web.servlet;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
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("BaseServle的service方法执行了");
        //完成方法分发
        //1.获取请求路径
        String uri = req.getRequestURI(); ///travel/user/add
//        System.out.println(uri);

        //2.获取方法名称
        String methodName = uri.substring(uri.lastIndexOf('/') + 1);
//        System.out.println(methodName); //add
        //3.获取方法对象
        //this谁调用我，我代表谁
//        System.out.println(this); //UserServlet对象
        try {
            Method method = this.getClass().getMethod(methodName, HttpServletRequest.class, HttpServletResponse.class);
           //忽略访问权限修饰符获取方法
//            Method method = this.getClass().getDeclaredMethod(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();
        }

    }
}

7.3UserServlet改写

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.HttpServlet;
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 {
    //声明一个UserService成员变量
    private  UserService service = new UserServiceImpl();

    /*
    注册功能
     */
    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！");
        }
        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
         */
    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("用户名或密码错误");
        }

        //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
         */
    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
         */
    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
         */
    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);
        }
    }
}

注：改写完成之后，相应的html文件中的路径也要改一下。

8.分类数据展示

8.1效果

 

 

8.2分析

 

8.3后台代码

CategoryServlet

package cn.itcast.travel.web.servlet;

import cn.itcast.travel.domain.Category;
import cn.itcast.travel.service.CategoryService;
import cn.itcast.travel.service.impl.CategoryServiceImpl;
import com.fasterxml.jackson.databind.ObjectMapper;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;

@WebServlet("/category/*")
public class CategoryServlet extends BaseServlet {
    private CategoryService service = new CategoryServiceImpl();
    /*
    查询所有
     */
    public void findAll(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1.调用service查询所有
        List<Category> cs = service.findAll();
        //2.序列化json返回
//        ObjectMapper mapper = new ObjectMapper();
//        response.setContentType("application/json;charset=utf-8");
//        mapper.writeValue(response.getOutputStream(),cs);
        writeValue(cs,response);
        
    }

    public void find(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        System.out.println("CategoryServlet的find方法...");
    }
}

CategoryService

package cn.itcast.travel.service;

import cn.itcast.travel.domain.Category;

import java.util.List;

public interface CategoryService {
    List<Category> findAll();
}
package cn.itcast.travel.service.impl;

import cn.itcast.travel.dao.CategoryDao;
import cn.itcast.travel.dao.impl.CategoryDaoImpl;
import cn.itcast.travel.domain.Category;
import cn.itcast.travel.service.CategoryService;

import java.util.List;

public class CategoryServiceImpl implements CategoryService {
    private CategoryDao categoryDao = new CategoryDaoImpl();

    @Override
    public List<Category> findAll() {
        return categoryDao.findAll();
    }
}

CategoryDao

package cn.itcast.travel.dao;

import cn.itcast.travel.domain.Category;

import java.util.List;

public interface CategoryDao {

     List<Category> findAll();
}
package cn.itcast.travel.dao.impl;

import cn.itcast.travel.dao.CategoryDao;
import cn.itcast.travel.domain.Category;
import cn.itcast.travel.util.JDBCUtils;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;

import java.util.List;

public class CategoryDaoImpl implements CategoryDao {
    private JdbcTemplate template = new JdbcTemplate(JDBCUtils.getDataSource());
    @Override
    public List<Category> findAll() {
        String sql = "select * from tab_category ";
        return template.query(sql,new BeanPropertyRowMapper<Category>(Category.class));
    }
}

在BaseServlet中封装了序列化json的方法

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.annotation.WebServlet;
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("BaseServle的service方法执行了");
        //完成方法分发
        //1.获取请求路径
        String uri = req.getRequestURI(); ///travel/user/add
//        System.out.println(uri);

        //2.获取方法名称
        String methodName = uri.substring(uri.lastIndexOf('/') + 1);
//        System.out.println(methodName); //add
        //3.获取方法对象
        //this谁调用我，我代表谁
//        System.out.println(this); //UserServlet对象
        try {
            Method method = this.getClass().getMethod(methodName, HttpServletRequest.class, HttpServletResponse.class);
           //忽略访问权限修饰符获取方法
//            Method method = this.getClass().getDeclaredMethod(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();
        }

    }

    /*
    直接将传入的对象序列化为json,并且写回客户端
     */
    public  void writeValue(Object obj,HttpServletResponse response) throws IOException {
        ObjectMapper mapper = new ObjectMapper();
        response.setContentType("application/json;charset=utf-8");
        mapper.writeValue(response.getOutputStream(),obj);
    }

    /*
    将传入的对象序列化返回
     */
    public  String writeValueAsString(Object obj) throws JsonProcessingException {
        ObjectMapper mapper = new ObjectMapper();
        return mapper.writeValueAsString(obj);

    }
}

8.4前台代码

header.html加载后，发送ajax请求，请求category/findAll

<!-- 头部 start -->
<script>
    $(function () {
        //查询用户信息
        $.get("user/findOne",{},function (data) {
            //{uid:1,name:'李四'}
            var msg = "欢迎回来，"+data.name;
            $("#span_username").html(msg);

        });

        //查询分类数据
        $.get("category/findAll",{},function (data) {
            //[{cid:1,cname:国内游},{},{}]
            var lis = '<li class="nav-active"><a href="index.html">首页</a></li>';
            //遍历数组，拼接字符串
            for (var i = 0; i < data.length; i++) {
                var li =' <li><a href="favoriterank.html">'+data[i].cname+'</a></li>'
                lis += li;
            }

            //拼接收藏榜的li
            lis+= ' <li><a href="favoriterank.html">收藏排行榜</a></li>';

            //将lis中的内容设置到ul的html中
            $("#category").html(lis);
        });
    });

</script>
<!-- 头部 start -->
    <header id="header">
        <div class="top_banner">
            <img src="images/top_banner.jpg" alt="">
        </div>
        <div class="shortcut">
            <!-- 未登录状态  -->
            <div class="login_out">
                <a href="login.html">登录</a>
                <a href="register.html">注册</a>
            </div>
            <!-- 登录状态  -->
            <div class="login">
                
                <span id="span_username"> </span>
                <a href="myfavorite.html" class="collection">我的收藏</a>
                <a href="javascript:location.href='exitServlet';">退出</a>
            </div>
        </div>
        <div class="header_wrap">
            <div class="topbar">
                <div class="logo">
                    <a href="/"><img src="images/logo.jpg" alt=""></a>
                </div>
                <div class="search">
                    <input name="" type="text" placeholder="请输入路线名称" class="search_input" autocomplete="off">
                    <a href="javascript:;" class="search-button">搜索</a>
                </div>
                <div class="hottel">
                    <div class="hot_pic">
                        <img src="images/hot_tel.jpg" alt="">
                    </div>
                    <div class="hot_tel">
                        <p class="hot_time">客服热线(9:00-6:00)</p>
                        <p class="hot_num">400-618-9090</p>
                    </div>
                </div>
            </div>
        </div>
    </header>
    <!-- 头部 end -->
     <!-- 首页导航 -->
    <div class="navitem">
        <ul id="category" class="nav">
         <!--   <li class="nav-active"><a href="index.html">首页</a></li>
            <li><a href="route_list.html">门票</a></li>
            <li><a href="route_list.html">酒店</a></li>
            <li><a href="route_list.html">香港车票</a></li>
            <li><a href="route_list.html">出境游</a></li>
            <li><a href="route_list.html">国内游</a></li>
            <li><a href="route_list.html">港澳游</a></li>
            <li><a href="route_list.html">抱团定制</a></li>
            <li><a href="route_list.html">全球自由行</a></li>
            <li><a href="favoriterank.html">收藏排行榜</a></li>-->
        </ul>
    </div>

 

 

 

 

 

 

 

 

 

 

 

 

 

 

标签：itcast,cn,项目,travel,旅游网,import,servlet,response
来源： https://www.cnblogs.com/xinmomoyan/p/11953332.html

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