SpringBoot设置和获取Cookie

设置Cookie

@GetMapping("/change-username")
public String setCookie(HttpServletResponse response) {
    // 创建一个 cookie对象
    Cookie cookie = new Cookie("username", "Jovan");

    //将cookie对象加入response响应
    response.addCookie(cookie);

    return "Username is changed!";
}

获取Cookie

@GetMapping(value = "/readCookies")
public void readCookies(HttpServletRequest request, HttpServletResponse response) throws IOException {
    //设置contentType，解决中文乱码
    response.setContentType("text/html;charset=utf-8");

    PrintWriter writer = response.getWriter();

    Cookie[] cookies = request.getCookies();

    if (cookies == null) {
        writer.println("从request中未读取到cookie");
    } else {
        writer.println("cookie数量: " + cookies.length);

        for (Cookie aCookie : cookies) {
            String name = aCookie.getName();
            String value = aCookie.getValue();

            writer.println(name + " = " + value);
        }
    }
}

Spring框架提供 @cookieValue 注释来获取HTTP cookie的值，此注解可直接用在控制器方法参数中

@GetMapping("/")
public String readCookie(@CookieValue(value = "username", 
                                      defaultValue = "Atta") String username) {
    return "Hey! My username is " + username;
}