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Cookie跨域setDomain和setPath
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<span class="link_postdate">2016-07-22 22:38</span>
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今天遇到了Cookie的問題，網上搜來些資料，記錄一下備忘！
正常的cookie只能在一個應用中共享，即一個cookie只能由創建它的應用獲得。
1.可在同一應用服務器內共享方法：設置cookie.setPath("/");
本機tomcat/webapp下面有兩個應用：cas和webapp_b，
1）原來在cas下面設置的cookie，在webapp_b下面獲取不到，path默認是產生cookie的應用的路徑。
2）若在cas下面設置cookie的時候，增加一條cookie.setPath("/");或者cookie.setPath("/webapp_b/");就可以在webapp_b下面獲取到cas設置的cookie了。
3）此處的參數，是相對於應用服務器存放應用的文件夾的根目錄而言的(比如tomcat下面的webapp)，因此cookie.setPath("/");之后，可以在webapp文件夾下的所有應用共享cookie，而cookie.setPath("/webapp_b/");是指cas應用設置的cookie只能在webapp_b應用下的獲得，即便是產生這個cookie的cas應用也不可以。
4）設置cookie.setPath("/webapp_b/jsp")或者cookie.setPath("/webapp_b/jsp/")的時候，只有在webapp_b/jsp下面可以獲得cookie，在webapp_b下面但是在jsp文件夾外的都不能獲得cookie。
5）設置cookie.setPath("/webapp_b");，是指在webapp_b下面才可以使用cookie，這樣就不可以在產生cookie的應用cas下面獲取cookie了
6）有多條cookie.setPath("XXX");語句的時候，起作用的以最后一條為准。
6）設置多個path的方法？？？
2.跨域共享cookie的方法：設置cookie.setDomain(".jszx.com");
A機所在的域：home.langchao.com,A有應用cas
B機所在的域：jszx.com，B有應用webapp_b
1）在cas下面設置cookie的時候，增加cookie.setDomain(".jszx.com");，這樣在webapp_b下面就可以取到cookie。
2）這個參數必須以“.”開始。
3）輸入url訪問webapp_b的時候，必須輸入域名才能解析。比如說在A機器輸入：http://lc-bsp.jszx.com:8080/webapp_b,可以獲取cas在客戶端設置的cookie，而B機器訪問本機的應用，輸入：http://localhost:8080/webapp_b則不可以獲得cookie。
4）設置了cookie.setDomain(".jszx.com");，還可以在默認的home.langchao.com下面共享。
5）設置多個域的方法？？？
最近的工作經常用到cookie，看了一些資料，雖然原來依賴cookie比較多的方案已經改成現在這個了，但是當時看得一些東西還是最好
記下來，免得過些天就一干二凈了，怪可惜的。老梁說過這樣的文字最好不要是純文本的，說得是。本來就已經很抽象了，最好弄點圖表，就算用123列出來也好。
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