java 操作cookie

Love The Way You Lie 2022-09-24 08:24 125阅读 0赞

添加Cookie： 
 
 
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException \{ 
        // 1.创建Cookie对象 
        Cookie cookie1 = new Cookie("webname", "XCoder Studio"); 
        // 2.配置Cookie对象 
        cookie1.setComment("Web Host Name");    // Cookie描述 
        cookie1.setMaxAge(24\*60\*60);            // Cookie有效时间 
        //cookie1.setPath("/");                 // Cookie有效路径 
          
        // 3.通过response对象将Cookie写入浏览器，当然需要解决中文乱码问题，否则会抛出异常 
        // java.lang.IllegalArgumentException: Control character in cookie value, consider BASE64 encoding your value 
        response.setCharacterEncoding("UTF-8"); 
        response.setContentType("text/html;charset=UTF-8"); 
        response.addCookie(cookie1); 
          
        // 跳转到首页 
        response.sendRedirect("./index.jsp"); 
    \} 
读取Cookie： 
 
 
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException \{ 
    // 读取Cookie，通过request请求读取Cookie 
    Cookie\[\] cookies = request.getCookies(); 
      
    // 判断是否存在Cookie，不存在跳转到首页 
    if (cookies == null) \{ 
        response.sendRedirect("./index.jsp"); 
        return; 
    \} 
      
    // 处理输出中文乱码问题 
    response.setCharacterEncoding("UTF-8"); 
    response.setContentType("text/html;charset=UTF-8"); 
    // 获取输出对象 
    PrintWriter out = response.getWriter(); 
    // 迭代处理客户端发送来的Cookie对象 
    out.println("--------------------------------------------------------- "); 
    for (Cookie cookie:cookies) \{ 
        out.println("Cookie名   称："+cookie.getName()+" "); 
        out.println("Cookie储   值："+cookie.getValue()+" "); 
        out.println("Cookie备   注："+cookie.getComment()+" "); 
        out.println("Cookie有效时间："+cookie.getMaxAge()+" "); 
        out.println("Cookie有效路径："+cookie.getPath()+" "); 
        out.println("Cookie有效域名："+cookie.getDomain()+" "); 
        out.println("<a href=\\"./CookieDel?name="+cookie.getName()+"\\">删除Cookie</a> "); 
        out.println("--------------------------------------------------------- "); 
    \} 
\} 
删除Cookie： 
 
 
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException \{ 
    // 获取GET传递参数名称 
    String delName = request.getParameter("name"); 
    if (delName == null) \{ 
        response.sendRedirect("./CookieRead"); 
        return; 
    \} 
      
    // 获取Cookies数组 
    Cookie\[\] cookies = request.getCookies(); 
    // 迭代查找并清除Cookie 
    for (Cookie cookie: cookies) \{ 
        if (delName.equals(cookie.getName())) \{ 
            cookie.setMaxAge(0); 
            response.addCookie(cookie); 
        \} 
    \} 
      
    response.setHeader("refresh", "3;./CookieRead"); 
    PrintWriter out = response.getWriter(); 
    out.println("Will go back after 3 seconds..."); 
\}