javaweb -- 3、Servlet系列之Cookie、Session

桃扇骨 2023-03-01 05:34 28阅读 0赞

**目录**

5.1： Servlet系列之Cookie

5.2：

5.3： 实现用户的一周免登录（将4.2.2的包和类全考过来）

6.1： Servlet系列之Session（给服务端的基本的存储）

1、创建sessoin对象

2、向Session对象中添加值

3、获取Session中的值

4、设置sessoin属性

6.2：

6.3：

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

# **5** #

## **5.1****：** **Servlet系列之Cookie** ##

**（相当于：浏览器的历史信息、5天内自动登录等等）**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTA0MjU2OQ_size_16_color_FFFFFF_t_70][]

**添加文件：**

![20200722102235459.png][]![20200722102237398.png][]

**web.xml****文件：**

<servlet>
 <servlet-name>CookieServlet</servlet-name>
 <servlet-class>com.mashibing.CookieServlet</servlet-class>
 </servlet>
 <servlet-mapping>
 <servlet-name>CookieServlet</servlet-name>
 <url-pattern>/cookie</url-pattern>
 </servlet-mapping>
 <servlet>

**Java****文件****：CookieServlet（Cookie程序）**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTA0MjU2OQ_size_16_color_FFFFFF_t_70 1][]

public class CookieServlet extends HttpServlet {
    
        @Override
        protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            this.doGet(request,response);
        }
        @Override
        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            request.setCharacterEncoding("utf-8");
            response.setCharacterEncoding("gbk");
    
            //response.getWriter().write("学习cookie");

![20200722102328624.png][]

//创建Cookie对象（两个Cookie对象）
            Cookie cookie = new Cookie("00001","beijing");
            Cookie cookie1 = new Cookie("0002","shanghai");
    //给cookie对象添加时间有效期,单位是s
            cookie.setMaxAge(3*24*3600); //浏览器重启后候数据还在
    //给cookie修改固定路径值
            cookie1.setPath("/cookie/abc");
    //将cookie设置到response（响应）对象中
            response.addCookie(cookie);
            response.addCookie(cookie1);
            response.getWriter().write("学习cookie");
        }
    }

**给cookie对象添加时间有效期,单位是秒：**

随便填入一个地址，进去检查（上次的信息仍然保留）

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTA0MjU2OQ_size_16_color_FFFFFF_t_70 2][]

如果重新启动浏览器：（上次的信息就死掉了）

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTA0MjU2OQ_size_16_color_FFFFFF_t_70 3][]

**给cookie修改固定路径值：**

调试：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTA0MjU2OQ_size_16_color_FFFFFF_t_70 4][]

在……/cookie/abc地址中打开：（地址已修改）

![20200722102411467.png][]![20200722102413945.png][]

cookie:用来处理客户端发送不同请求的时候使用相同的参数信息
    
      cookie的使用：
    *        Cookie cookie = new Cookie("00001","beijing");
    *        response.addCookie(cookie);
    *        设置cookie的参数
    *        cookie.setMaxAge( int seconds)
    *        cookie.setPath(String  url)
    *        获取cookie对象
    *        Cookie[] cookies = request.getCookies()
    *  特点：
    *      1、cookie是保存在浏览器端的数据名称
    *      2、cookie分类：
    		临时cookie，默认是存储在内存中的，所以当浏览器关闭的时候，cookie自动失效
    		持久化cookie，保存在浏览器的某个存储目录，当时间过期之后，才会失效
    *      3、每一个cookie对象中保存一个key-value键值对的数据，想要存储多个k-v数据，需要创建多个Cookie对象  //两个Cookie对象

![20200722102448242.png][]

## **5.2****：** ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTA0MjU2OQ_size_16_color_FFFFFF_t_70 5][]![20200722102459203.png][]

**web.xml****文件：**

<servlet-name>GetCookieServlet</servlet-name>
 <servlet-class>com.mashibing.GetCookieServlet</servlet-class>
 </servlet>
 <servlet-mapping>
 <servlet-name>GetCookieServlet</servlet-name>
 <url-pattern>/getcookie</url-pattern>
 </servlet-mapping>

**java****文件：****GetCookieServlet****（获取Cookie程序）**

public class GetCookieServlet extends HttpServlet {
        protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            this.doGet(request,response);
        }
        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    
            request.setCharacterEncoding("utf-8");
            response.setCharacterEncoding("gbk");
    
            //获取cookie对象
            Cookie[] cookies = request.getCookies();
    //写if是防止页面发生一次500，导致数据永久消失
            if(cookies.length>0){ 
                for (Cookie c: cookies) {
                    String key = c.getName();
                    String value = c.getValue();
                    System.out.println(key+":"+value);  //为00001 : beijing
                }
            }
        }
    }

![20200722102538302.png][]

## **5.3****：** **实现用户的一周免登录****（将4.2.2的包和类全考过来）** ##

用户免登录实现：
    
        1、用户发送验证cookie信息的请求，编写对应的servlet进行处理
        2、如果包含cookie，直接跳转到成功页面
        3、如果不包含cookie信息，直接跳转到登录页面

![20200722102555406.png][]

**web.xml****文件：**

<servlet>
 <servlet-name>PageServlet</servlet-name>
 <servlet-class>com.cookie.control.PageServlet</servlet-class>
 </servlet>
 <servlet-mapping>
 <servlet-name>PageServlet</servlet-name>
 <url-pattern>/page</url-pattern>
 </servlet-mapping>
 
 <servlet>
 <servlet-name>LoginServlet</servlet-name>
 <servlet-class>com.cookie.control.LoginServlet</servlet-class>
 </servlet>
 <servlet-mapping>
 <servlet-name>LoginServlet</servlet-name>
 <url-pattern>/login</url-pattern>
 </servlet-mapping>
 
 <servlet>
 <servlet-name>HelloServlet</servlet-name>
 <servlet-class>com.cookie.control.HelloServlet</servlet-class>
 </servlet>
 <servlet-mapping>
 <servlet-name>HelloServlet</servlet-name>
 <url-pattern>/hello</url-pattern>
 </servlet-mapping>

![20200722102615916.png][]

**web.xml****文件：**

<servlet>
 <servlet-name>CookieProjectServlet</servlet-name>
 <servlet-class>com.cookie.control.CookieProjectServlet</servlet-class>
 </servlet>
 <servlet-mapping>
 <servlet-name>CookieProjectServlet</servlet-name>
 <url-pattern>/ck</url-pattern>
 </servlet-mapping>

**java****文件：****CookieProjectServlet****（Cookie项目程序）**

public class CookieProjectServlet extends HttpServlet {
    //引入”用户服务”的类
        UserService userService = new UserServiceImpl();
    
        @Override
        protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            this.doGet(request,response);
        }
        @Override
        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            request.setCharacterEncoding("utf-8");
            response.setCharacterEncoding("gbk");
    
    //获取cookie对象
            Cookie[] cookies = request.getCookies();
    //如果cookies如果为null，直接跳转到登录页面进行登录请求
            if(cookies!=null){
                for (Cookie  c: cookies) {
                    String key = c.getName(); //id（名字）
                    if("uid".equals(key)){
                        String value =  c.getValue();
                        User u = userService.getUserById(Integer.valueOf(value));
    //如果u如果不为null，那么有值，直接跳转
                        if(u!=null){
                            response.sendRedirect("hello");//跳转后的地址
                        }else{
                            response.sendRedirect("page"); //跳转后的地址
                        }
                    }else{
                        response.sendRedirect("page"); //跳转后的地址
                    }
                }
            }else{
    //跳转到登录页面
                response.sendRedirect("page"); //跳转后的地址
            }
        }
    }

**java****文件：****LoginServlet****（登录程序）**

**修改成：**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTA0MjU2OQ_size_16_color_FFFFFF_t_70 6][]

**java****文件：****UserService****（用户服务）**

**添加：**

![20200722102656590.png][]

**java****文件：****UserServiceImpl****（用户服务）**

**添加：**

![20200722102715488.png][]

**java****文件：****UserDao****（用户访问）**

**添加：**

![20200722102721680.png][]

**java****文件：****UserDaoImpl****（用户访问）**

**添加：**

public class UserDaoImpl implements UserDao {
        @Override
        public User checkUser(User user) {
            //定义连接的对象
            Connection conn = null;
            PreparedStatement pstmt  = null;
            ResultSet rs = null;
            User u = null;
            try {
            //加载驱动
                Class.forName("com.mysql.jdbc.Driver");
                //获取连接
                conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/login","root","123456");
                //获取预处理块
                pstmt = conn.prepareStatement("select * from user where name = ? and pwd =?");
                //给？赋值
                pstmt.setString(1,user.getName());
                pstmt.setString(2,user.getPwd());
                //执行sql语句
                rs = pstmt.executeQuery();
                //从resultset中获取结果值
                while (rs.next()){
                    u = new User(rs.getInt("id"),rs.getString("name"),rs.getString("pwd"));
                }
            } catch (Exception e) {
                e.printStackTrace();
         }finally {
            try {
                rs.close();
                pstmt.close();
                conn.close();
            } catch (SQLException e) {e.printStackTrace();}
        }
           return u;
    }
    ===================== 复制上面，只修改黄色部分 =====================
    @Override
    public User getUserById(int id) {
        //定义连接的对象
        Connection conn = null;
        PreparedStatement pstmt  = null;
        ResultSet rs = null;
        User u = null;
        try {
            //加载驱动
            Class.forName("com.mysql.jdbc.Driver");
            //获取连接
            conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/login","root","123456");
            //获取预处理块
            pstmt = conn.prepareStatement("select * from user where id = ?");
            //给？赋值
            pstmt.setInt(1,id);
            //执行sql语句
            rs = pstmt.executeQuery();
            //从resultset中获取结果值
            while (rs.next()){
                u = new User(rs.getInt("id"),rs.getString("name"),rs.getString("pwd"));
            }
        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            try {
                rs.close();
                pstmt.close();
                conn.close();
            } catch (SQLException e) {e.printStackTrace();}
        }
        return u;
    }

**①调试：**

![20200722102800952.png][]![20200722102803875.png][]

退出浏览器，重启

**②直接进入该链接：**

![20200722102810487.png][]![20200722102813500.png][]

# **6** #

## **6.1****：** **Servlet****系列之Session（给服务端的基本的存储）** ##

cookie与session区别：

<table style="width:421.9pt;"> 
 <tbody> 
 <tr> 
 <td style="border-color:#bfbfbf;vertical-align:top;width:114.6pt;"> cookie </td> 
 <td style="border-color:#bfbfbf;vertical-align:top;width:307.3pt;"> 一个用户发送多次相同请求的处理需要使用相同的数据 </td> 
 </tr> 
 <tr> 
 <td style="border-color:#bfbfbf;width:114.6pt;"> Session </td> 
 <td style="width:307.3pt;"> 一个用户发送不同请求的处理需要使用相同的数据（比如下面，报错500，也能有响应头下的cookie） </td> 
 </tr> 
 </tbody> 
</table>

**Session****：解决一个用户发送不同请求时的数据共享问题（比如进入淘宝的某个商品地址不用输密码）**

在处理过程中会给用户创建一个 session 对象，用来存储用户请求处理相关的公共数据，并将此 session 对象的 JSESSIONID 以 sessoin 的形式保存在浏览器中**(****临时存储， 浏览器关闭即失效)，与之前的cookie类似？**

用户在发起第二次请求及后续请求时， 请求信息中会附带 JSESSIONID， 服务器在接收到请求后，调用对应的 Servlet 进行请求处理，同时根据 JSESSIONID 返回其对应的 session 对象

1、由服务器进行创建session对象，存储共享的数据
          2、session需要依赖cookie技术
          3、每个用户对应一个独立的session对象
          4、每个session对象的有效时长是30分钟
          5、每次关闭浏览器的时候，重新请求都会开启一个新的session对象，因为返回的JSESSIONID保存在浏览器的内存中（临时cookie），所以关闭之后自然消失

### **1****、创建sessoin****对象 ** ###

HttpSession session = request.getSession()

### **2****、向Session****对象中添加值 ** ###

sessoin.setAttribute(String name,Object object)

### **3****、获取Session****中的值 ** ###

session.getAttribute(String name)

### **4****、设置sessoin****属性** ###

session.setMaxInactiveInterval(5) **//****设置存活时间，5****秒**

session.invalidate(); **//session****强制失效**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTA0MjU2OQ_size_16_color_FFFFFF_t_70 7][]

## ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTA0MjU2OQ_size_16_color_FFFFFF_t_70 8][]![20200722133522244.png][]![20200722133525798.png][]

**web.xml****文件：**

<servlet>
 <servlet-name>SessionServlet</servlet-name>
 <servlet-class>com.mashibing.SessionServlet</servlet-class>
 </servlet>
 <servlet-mapping>
 <servlet-name>SessionServlet</servlet-name>
 <url-pattern>/session</url-pattern>
 </servlet-mapping>

**java****文件：****SessionServlet****（会话程序）**

public class SessionServlet extends javax.servlet.http.HttpServlet {
        @Override
        protected void doPost(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws javax.servlet.ServletException, IOException {
            this.doGet(request,response);
        }
        @Override
        protected void doGet(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws javax.servlet.ServletException, IOException {
    //将乱码换成中文
            request.setCharacterEncoding("utf-8");
            response.setCharacterEncoding("utf-8");
            response.setContentType("text/html;charset=utf-8");
    
            System.out.println("接受到请求get");
    
    //图一：第一次开启浏览器，cookie在请求头下
    //图三：第二次开启浏览器，cookie在响应头下（由之前保持下来了）

![20200722133642935.png][]![20200722133648971.png][]

![20200722133645640.png][]![20200722133651951.png][]

**idea****中显示：（是两次打开浏览器）**不一样就表示数据没保存？

![20200722133930772.png][]

//获取session对象
            HttpSession session = request.getSession();
    //设置session的有效时长
            //session.setMaxInactiveInterval(5); //5秒
    //getid方法拿到JSESSIONID
            System.out.println(session.getId());
    //设置session强制失效
            //session.invalidate();
    //向session中设置参数
            //session.setAttribute("111","zhangsan"); //这行是配合下面的java代码
            response.getWriter().write("学习session");
        }
    }

**当随便输入地址时：****也出现Cookie（原因是留下的信息造成的）**

![20200722133953523.png][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTA0MjU2OQ_size_16_color_FFFFFF_t_70 9][]

## **6.2****：** ##

![20200722134014816.png][]![2020072213402060.png][]

**web.xml****文件：**

<servlet>
 <servlet-name>SessionServlet2</servlet-name>
 <servlet-class>com.mashibing.SessionServlet2</servlet-class>
 </servlet>
 <servlet-mapping>
 <servlet-name>SessionServlet2</servlet-name>
 <url-pattern>/session2</url-pattern>
 </servlet-mapping>

**java****文件：****SessionServlet2****（会话程序）**

public class SessionServlet2 extends HttpServlet {
        @Override
        protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            this.doGet(request,response);
        }
        @Override
        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    
            request.setCharacterEncoding("utf-8");
            response.setCharacterEncoding("utf-8");
            response.setContentType("text/html;charset=utf-8");
    
    //获取session对象
            HttpSession session= request.getSession();
    //获取session中的参数值
            String str = (String) session.getAttribute("111");
            System.out.println(str);
            response.getWriter().write(str);
        }
    }

//图一：第一次开启浏览器，cookie在请求头下

//图二：第二次开启浏览器，cookie在响应头下（有之前保持下来了）

![20200722134100501.png][]![20200722134103283.png][]

![2020072213411015.png][] （上面是第一次开启浏览器，下面第二次）

## **6.3****：** ##

**例子：报错500**

![2020072213412938.png][]![20200722134131959.png][]

**idea****中显示：**![20200722134139162.png][] **（登录成功）**

**熟悉之前的案例：**

![2020072213414790.png][]**（数据库中有该用户 -->**** ****登录成功）**

**跳转到hello：**![20200722134214906.png][]

**和** **“实现用户的一周免登录案例”** **一样，也是将4.2.2的包和类拷过来****:**

（此时就有五个页面地址）：

![20200722134230473.png][]

**web.xml****文件：**

<servlet>
 <servlet-name>PageServlet</servlet-name>
 <servlet-class>com.session.PageServlet</servlet-class>
 </servlet>
 <servlet-mapping>
 <servlet-name>PageServlet</servlet-name>
 <url-pattern>/page</url-pattern>
 </servlet-mapping>
 
 <servlet>
 <servlet-name>LoginServlet</servlet-name>
 <servlet-class>com.session.LoginServlet</servlet-class>
 </servlet>
 <servlet-mapping>
 <servlet-name>LoginServlet</servlet-name>
 <url-pattern>/login</url-pattern>
 </servlet-mapping>
 
 <servlet>
 <servlet-name>HelloServlet</servlet-name>
 <servlet-class>com.session.HelloServlet</servlet-class>
 </servlet>
 <servlet-mapping>
 <servlet-name>HelloServlet</servlet-name>
 <url-pattern>/hello</url-pattern>
 </servlet-mapping>

**java****文件：****LoginServlet****（登录程序）**

**添加：**

![20200722134256465.png][]

**java****文件：****HelloServiet****（Hello程序）**

String **name** = request.getParameter("name");**换成：**

![20200722134310586.png][]

![20200722134334676.png][]![20200722134337381.png][]

cookie与session区别：

<table> 
 <tbody> 
 <tr> 
 <td style="border-color:#bfbfbf;vertical-align:top;width:106.1pt;"> cookie </td> 
 <td style="border-color:#bfbfbf;vertical-align:top;width:284.4pt;"> 同一个用户发送多次相同请求的处理需要使用相同的数据 </td> 
 </tr> 
 <tr> 
 <td style="border-color:#bfbfbf;width:106.1pt;"> Session </td> 
 <td style="width:284.4pt;"> 同一个用户发送不同请求的处理需要使用相同的数据（比如上面，报错500，也能有响应头下的cookie） </td> 
 </tr> 
 </tbody> 
</table>

**Session****：解决一个用户发送不同请求时的数据共享问题（比如进入淘宝的某个商品地址不用输密码）**

在处理过程中会给用户创建一个 session 对象，用来存储用户请求处理相关的公共数据，并将此 session 对象的 JSESSIONID 以 sessoin 的形式保存在浏览器中**(****临时存储，****浏览器关闭即失效)****，与之前的cookie****类似？**

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTA0MjU2OQ_size_16_color_FFFFFF_t_70]: /images/20230209/5d86afaf07264b0cbca628a3201f9562.png
[20200722102235459.png]: https://img-blog.csdnimg.cn/20200722102235459.png
[20200722102237398.png]: /images/20230209/ca51d19f5ae24c6aa5684e64a87a0e32.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NTA0MjU2OQ_size_16_color_FFFFFF_t_70 1]: /images/20230209/c5a11adab8bb413696754067a7d269bd.png
[20200722102328624.png]: /images/20230209/57c13188f94c4d4080d891439395a60d.png
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