Servlet(三)--cookie_if cookie equals cookie-优快云博客

本文链接：https://blog.youkuaiyun.com/sz85850597/article/details/53871997

本文提供了一个简单的HTTP Cookie操作示例，包括如何通过Java Servlet API创建并添加Cookie，以及如何从客户端请求中读取已存在的Cookie。示例展示了设置Cookie的有效期，并分别处理用户名和密码。

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添加cookie

public void doGet(HttpServletRequest request, HttpServletResponse response)
		throws ServletException, IOException {
	String username=request.getParameter("username");
	String password=request.getParameter("password");
	Cookie cookie_username=new Cookie("username", username);
	Cookie cookis_password=new Cookie("password", password);
	cookie_username.setMaxAge(60*60*24*7);	//设置cookie的存活时间为一周（以秒计算）
	cookis_password.setMaxAge(60*60*24*7);
	response.addCookie(cookie_username);	//添加cookie
	response.addCookie(cookis_password);
	PrintWriter out=response.getWriter();
	out.println(username+password);
	out.println("set ok");
}

获取cookie

public void doGet(HttpServletRequest request, HttpServletResponse response)
		throws ServletException, IOException {
	
	PrintWriter out=response.getWriter();
	out.println("hello");
	String cookie_username="username";
	String cookie_password="password";
	Cookie[] cookies=request.getCookies();
	if(cookies!=null){
		for(int i=0;i<cookies.length;i++){
			Cookie cookie=cookies[i];
			if(cookie_username.equals(cookie.getName()))
				out.println(cookie.getValue());
			if(cookie_password.equals(cookie.getName()))
				out.println(cookie.getValue());
		}
	}
}