Cookie的簡易用法

Cookie

Cookie是客戶端技術，程序把每個用戶的數據以cookie的形式寫給用戶各自的瀏覽器。當用戶使用瀏覽器再去訪問服務器中的web資源時，就會帶着各自的數據去。這樣，web資源處理的就是用戶各自的數據了。

1.在java中增加一個cookie

Cookie cookie = new Cookie("mytest","123456");
response.addCookie(cookie);

2.在java中修改一個cookie

Cookie[] cookies = request.getCookies();
for(Cookie cookie : cookies) {
    if("mytest".equals(cookie.getName())) {
        cookie.setValue("mytestNEW");
        response.addCookie(cookie);
    }
}

3.怎么在java中刪除一個cookie

Cookie[] cookies = request.getCookies();
for(Cookie cookie : cookies) {
    if("mytest".equals(cookie.getName())) {
        cookie.setMaxAge(0);
        response.addCookie(cookie);
    }
}

4.怎么在java中顯示cookie列表

Cookie[] cookies = request.getCookies();
for(Cookie cookie : cookies) {
    try {
        response.getWriter().println(cookie.getName() + "-->" +   cookie.getValue());
    } catch (IOException e) {
        e.printStackTrace();
    }

}

5.怎么在java中增加一個中文cookie

Cookie cookie;
try {
    cookie = new Cookie("mytest",URLEncoder.encode("我的測試", "UTF-8"));
    response.addCookie(cookie);
} catch (UnsupportedEncodingException e) {
    e.printStackTrace();
}

6.怎么在java中顯示中文cookie值

Cookie[] cookies = request.getCookies();
for(Cookie cookie : cookies) {
    if("mytest".equals(cookie.getName())) {
        try {      response.getWriter().println(URLDecoder.decode(cookie.getValue(), "UTF-8"));
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

7.怎么在java中根據cookie名稱獲得cookie值

Cookie[] cookies = request.getCookies();
for(Cookie cookie : cookies) {
    if("mytest".equals(cookie.getName())) {
        try {
            response.getWriter().println(cookie.getName() + "-->" + cookie.getValue());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

8.怎么在java中設置cookie路徑

Cookie cookie1 = new Cookie("mytest","mytest1");
cookie1.setPath("/test1");
Cookie cookie2 = new Cookie("mytest","mytest2");
cookie2.setPath("/test2");
response.addCookie(cookie1);
response.addCookie(cookie2);

9.怎么在java中設置cookie過期時間為60秒

Cookie cookie = new Cookie("mytest","mytest1");
cookie.setMaxAge(60);
response.addCookie(cookie);

10.怎么在java中設置cookie域名

Cookie cookie = new Cookie("mytest","mytest1");
cookie.setDomain("127.0.0.1");
response.addCookie(cookie);