讲解一下这段代码:ListPhoneServlet： package Session01; 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.io.PrintWriter; import java.util.ArrayList; @WebServlet("/listPhones") public class ListPhoneServlet extends HttpServlet { @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { resp.setContentType("text/html;charset=utf-8"); PrintWriter out = resp.getWriter(); out.println("<h2>目前可供选择的手机如下：</h2>"); ArrayList<Phone> allPhones = PhoneDb.getAll(); if (allPhones != null && allPhones.size() > 0) { for (int i = 0; i < allPhones.size(); i++) { Phone ck = allPhones.get(i); out.println("手机名:"+ck.getName()+"  价格："+ck.getPrice()+"  <a href= "buyPhoneServlet?id=" + ck.getId() + "\">立即购买</a >  "); out.println("<a href=\"cartPhoneServlet?id=" + ck.getId() + "\">加入购物车</a ><br><br>"); } } } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { } }

package com.rain.servlet; import java.io.IOException; 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 com.rain.dao.AdminDao

其中，javax.servlet.annotation.WebServlet 注解用于标记一个 Servlet 类，javax.servlet.http.HttpServlet 是 Servlet 接口的实现类，javax.servlet.http.HttpServletRequest 和 javax.servlet....

大致讲解一下这段代码:ListPhoneServlet： package Session01; 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.io.PrintWriter; import java.util.ArrayList; @WebServlet("/listPhones") public class ListPhoneServlet extends HttpServlet { @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { resp.setContentType("text/html;charset=utf-8"); PrintWriter out = resp.getWriter(); out.println("目前可供选择的手机如下："); ArrayList allPhones = PhoneDb.getAll(); if (allPhones != null && allPhones.size() > 0) { for (int i = 0; i < allPhones.size(); i++) { Phone ck = allPhones.get(i); out.println("手机名:"+ck.getName()+" 价格："+ck.getPrice()+" 立即购买 "); out.println("加入购物车

"); } } } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { } }

@WebServlet("/listPhones")表示将该Servlet映射到URL "/listPhones"，即当客户端访问这个URL时会触发该Servlet的doGet方法。 doGet方法中，首先设置响应的内容类型为"text/html;charset=utf-8"，然后获取...

讲解一下这段代码:5.ListCartServlet： package Session01; 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.io.PrintWriter; import java.util.ArrayList; @WebServlet("/listCartServlet") public class ListCartServlet extends HttpServlet { @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { resp.setContentType("text/html;charset=utf-8"); PrintWriter out=resp.getWriter(); HttpSession session=req.getSession(); ArrayList cart =(ArrayList) session.getAttribute("cart"); if (cart==null){ out.println("暂时还没有购物车数据。"); } else {out.println("您选购的物品如下:
"); for (Phone ck:cart){ out.println(""+ck.getName()+""+ck.getPrice()+""); } } } }

这段代码是一个 Java Servlet，用于展示用户的购物车信息。下面是代码的具体解释： 1. package Session01; 定义了这个类所在的包名。 2. import 语句引入需要使用的 Java 类。 3. @WebServlet("/...

谅解一下这段代码:6.BuyPhoneServlet： package Session01; 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.io.PrintWriter; import java.util.ArrayList; @WebServlet("/buyPhoneServlet") public class BuyPhoneServlet extends HttpServlet { @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { resp.setContentType("text/html;charset=utf-8"); PrintWriter out=resp.getWriter(); String idstr=req.getParameter("id"); int id=Integer.parseInt(idstr); ArrayList ckDB= PhoneDb.getAll(); Phone ck=ckDB.get(id-1); out.println("您购买的"+ck.getName()+"手机下单成功。"); out.println("继续选购"); } }

这段代码是一个 Servlet，用于处理用户购买手机的请求。具体来说，它实现了 HttpServlet 接口，并通过 @WebServlet 注解将其映射到了 "/buyPhoneServlet" 的 URL 上。在 doGet 方法中，首先设置了响应的内容类型为...

大致讲解一下代码:5.ListCartServlet： package Session01; 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.io.PrintWriter; import java.util.ArrayList; @WebServlet("/listCartServlet") public class ListCartServlet extends HttpServlet { @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { resp.setContentType("text/html;charset=utf-8"); PrintWriter out=resp.getWriter(); HttpSession session=req.getSession(); ArrayList cart =(ArrayList) session.getAttribute("cart"); if (cart==null){ out.println("暂时还没有购物车数据。"); } else {out.println("您选购的物品如下:
"); for (Phone ck:cart){ out.println(""+ck.getName()+""+ck.getPrice()+""); } } } }

2. 定义ListCartServlet类，继承HttpServlet类，并使用@WebServlet注解将该Servlet映射到/listCartServlet路径。 3. 重写doGet()方法，处理HTTP GET请求。 4. 设置响应类型为"text/html;charset=utf-8"。 5. 获取...

大致讲解一下代码:6.BuyPhoneServlet： package Session01; 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.io.PrintWriter; import java.util.ArrayList; @WebServlet("/buyPhoneServlet") public class BuyPhoneServlet extends HttpServlet { @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { resp.setContentType("text/html;charset=utf-8"); PrintWriter out=resp.getWriter(); String idstr=req.getParameter("id"); int id=Integer.parseInt(idstr); ArrayList ckDB= PhoneDb.getAll(); Phone ck=ckDB.get(id-1); out.println("您购买的"+ck.getName()+"手机下单成功。"); out.println("继续选购"); } }

这段代码是一个 Java Servlet，用于处理用户购买手机的请求。当用户点击购买按钮时，会向服务器发送一个 HTTP GET 请求，并带上要购买的手机的 ID。该 Servlet 会解析请求参数中的 ID，并通过 PhoneDb 类从数据库中...

大致讲解一下这段代码:AddCartServlet： package Session01; 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.io.PrintWriter; import java.util.ArrayList; @WebServlet("/cartPhoneServlet") public class AddCartServlet extends HttpServlet { @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { resp.setContentType("text/html;charset=utf-8"); PrintWriter out=resp.getWriter(); String idstr=req.getParameter("id"); int id=Integer.parseInt(idstr); ArrayList ckDB= PhoneDb.getAll(); Phone ck=ckDB.get(id-1); HttpSession session=req.getSession(); ArrayList cart=(ArrayList)session.getAttribute("cart"); if (cart==null){ cart=new ArrayList(); } cart.add(ck); session.setAttribute("cart",cart); out.println("添加购物车成功。"); out.println("继续选购

"); out.println("查看购物车"); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { } }

这段代码是一个 Java Servlet，用于处理添加商品到购物车的请求。具体来说，它接收一个 GET 请求，获取请求参数中的商品 ID，从数据库中获取对应的商品信息，将商品信息添加到用户的购物车中，最后向客户端发送添加...

给我接受一下这段代码package com.sj.newsrelease.servlet; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.Cookie; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; @WebServlet("/LogoutServlet") public class LogoutServlet extends HttpServlet { private static final long serialVersionUID = 1L; public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //1.用户注销 request.getSession().removeAttribute("user"); //2.从客户端删除自动登录的cookie Cookie cookie = new Cookie("autologin", "msg"); cookie.setPath(request.getContextPath()); cookie.setMaxAge(0); response.addCookie(cookie); response.sendRedirect(request.getContextPath()+"/login.jsp"); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } }

它使用了 javax.servlet.Servlet 接口的实现，并使用了 @WebServlet 注解来指定访问该 Servlet 的 URL 路径。在 doGet() 方法中，它执行以下操作： 1. 删除当前会话中名为 "user" 的属性，即删除当前用户的会话状态...

package com.sj.newsrelease.servlet; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.Cookie; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; @WebServlet("/LogoutServlet") public class LogoutServlet extends HttpServlet { private static final long serialVersionUID = 1L; public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //1.用户注销 request.getSession().removeAttribute("user"); //2.从客户端删除自动登录的cookie Cookie cookie = new Cookie("autologin", "msg"); cookie.setPath(request.getContextPath()); cookie.setMaxAge(0); response.addCookie(cookie); response.sendRedirect(request.getContextPath()+"/login.jsp"); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } }给我解释一下这段代码

这段代码使用了 Java Servlet API 和 Cookie API，其中 @WebServlet("/LogoutServlet") 注解表示该 Servlet 的访问路径为 "/LogoutServlet"。同时，doGet() 方法会处理 GET 请求，而 doPost() 方法会将其转发到 ...

springboot3.1.2使用javax.servlet

import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io....

package box.controller; 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; @WebServlet(name = "LogoutServlet", value = "/LogoutServlet") public class LogoutServlet extends HttpServlet { @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) { request.getSession().removeAttribute("userInfo"); try { request.getRequestDispatcher("index.jsp").forward(request, response); } catch (ServletException | IOException e) { e.printStackTrace(); } } @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) { doGet(request, response); } } 这个登出功能有什么不对

从代码上看，这个登出功能似乎没有明显的问题。它是一个Servlet，当用户发起GET请求时，会从当前会话中移除名为"userInfo"的属性，并将请求转发到index.jsp页面。然而，需要注意的是，在处理异常时，代码只是简单...

package com.cn.servlet04; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.Cookie; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; import java.net.URLDecoder; import java.net.URLEncoder; import java.text.SimpleDateFormat; import java.util.Date; @WebServlet("/Cookie03") public class ServleCookie03 extends HttpServlet { @Override protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { //设置响应消息体的数据格式 resp.setContentType("text/html;char=utf-8"); //获取cookie Cookie[] cookies = req.getCookies(); //遍历数据 if(cookies != null && cookies.length>0){ for(Cookie c:cookies){ String name = c.getName(); //判断name是否是登录时间的name System.out.println("name"+name); if("time".equals(name)){ String value = c.getValue(); //解码 value = URLDecoder.decode(value,"utf-8"); //有我要的cookie 不是第一次访问 resp.getWriter().write("欢迎回来"); } } } if(cookies == null || cookies.length==0){ //第一次访问 Date date = new Date();//获取系统时间 SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss"); String str_date = sdf.format(date); Cookie c = new Cookie("time",str_date); // c.setMaxAge(0); resp.addCookie(c); resp.getWriter().write("欢迎你首次访问"); } } } 为什么网页无法正常显示，给出修改过后的代码

import javax.servlet.annotation.WebServlet; import javax.servlet.http.Cookie; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet....

数据库的基本操作前端加后端.zip

import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io....

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本文实例讲述了Java Servlet生成JSON格式数据并用jQuery显示的方法。分享给大家供大家参考，具体如下： ...import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import jav

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前段时间做了个学校的春萌项目，其中用到vue连接后端java...import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.se

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