servlet的Cookie添加、查看、删除 谁借莪1个温暖的怀抱¢ 2022-04-23 15:26 166阅读 0赞 首先在html中添加两个a标签:添加cookie和读取cookie < a href = “save”>saveCookie< /a> < br/> < a href = “read”>readCookie< /a>< br/> servlet: 1、添加cookie 主要语句: Cookie cookie1 = new Cookie(“cookie1”,“cookie1’s value”); resp.add(cookie1); //默认添加的cookie是在当前目录 Cookie cookie2 = new Cookie(“cookie2”,“cookie2’s value”); cookie2.setPath("/") //相当于所有都可以查看,没有范围可言 public class SavaCookie extends HttpServlet { @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { Cookie cookie1 = new Cookie("cookie1","cookie1's value"); resp.addCookie(cookie1); Cookie cookie2 = new Cookie("cookie2","cookie2's value"); cookie2.setPath("/"); resp.addCookie(cookie2); Cookie cookie3 = new Cookie("cookie3","cookie3's value"); cookie3.setPath("/temp/"); resp.addCookie(cookie3); resp.sendRedirect("index.html"); } 2、读取cookie 主要代码: Cookie\[\] cookies = req.getCookies(); StringBuilder sb = new StringBuilder(“Cookie的信息:”); for(Cookie c:cookies)\{ sb.append("< li>").append(c.getName()).append("–>").append(c.getValue()).append("< /li>"); resp.setContentType(“text/html;charset=UTF-8”); resp.getWriter().write(sb.toString()); \} 代码: public class ReadCookie extends HttpServlet { @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { req.setCharacterEncoding("UTF-8"); Cookie[] cookies = req.getCookies(); StringBuilder sb = new StringBuilder("Cookie信息:"); for(Cookie c :cookies){ sb.append("<li>").append(c.getName()).append("->").append(c.getValue()).append("</li>"); } resp.setContentType("text/html;charset=UTF-8"); resp.getWriter().write(sb.toString()); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { doGet(req,resp); } } web.xml: <servlet> <servlet-name>saveservlet</servlet-name> <servlet-class>com.sy.SavaCookie</servlet-class> </servlet> <servlet-mapping> <servlet-name>saveservlet</servlet-name> <url-pattern>/save</url-pattern> </servlet-mapping> <servlet> <servlet-name>readservlet</servlet-name> <servlet-class>com.sy.ReadCookie</servlet-class> </servlet> <servlet-mapping> <servlet-name>readservlet</servlet-name> <url-pattern>/read</url-pattern> </servlet-mapping>
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