Android中如何保存cookie
16lz
2021-01-26
android中有时候需要保存由服务器返回的cookie，那么如何存取呐？
这需要我们自定义两个拦截器来实现
SaveCookiesInterceptor和AddCookiesInterceptor
首先定义响应拦截器，该拦截器实现从response获取set-cookie字段的值，并将其保存在本地。
代码如下：
public class SaveCookiesInterceptor implements Interceptor { private static final String COOKIE_PREF = "cookies_prefs"; private Context mContext; public SaveCookiesInterceptor(Context context) { mContext = context; } @Override public Response intercept(Chain chain) throws IOException { Request request = chain.request(); Response response = chain.proceed(request); //set-cookie可能为多个 if (!response.headers("set-cookie").isEmpty()) { List cookies = response.headers("set-cookie"); String cookie = encodeCookie(cookies); saveCookie(request.url().toString(),"gfan.com",cookie); } return response; } //整合cookie为唯一字符串 private String encodeCookie(List cookies) { StringBuilder sb = new StringBuilder(); Set set=new HashSet<>(); for (String cookie : cookies) { String[] arr = cookie.split(";"); for (String s : arr) { if(set.contains(s))continue; set.add(s); } } Iterator ite = set.iterator(); while (ite.hasNext()) { String cookie = ite.next(); sb.append(cookie).append(";"); } int last = sb.lastIndexOf(";"); if (sb.length() - 1 == last) { sb.deleteCharAt(last); } return sb.toString(); } //保存cookie到本地，这里我们分别为该url和host设置相同的cookie，其中host可选 //这样能使得该cookie的应用范围更广 private void saveCookie(String url,String domain,String cookies) { SharedPreferences sp = mContext.getSharedPreferences(COOKIE_PREF, Context.MODE_PRIVATE); SharedPreferences.Editor editor = sp.edit(); if(url.contains("index.php?m=member&c=gfan_index&a=login")){ if (!TextUtils.isEmpty(domain)) { editor.putString(domain, cookies); } editor.apply(); } }} 其次定义请求拦截器，如果该请求存在cookie，则为其添加到Header的Cookie中，代码如下：
代码如下：
public class AddCookiesInterceptor implements Interceptor { private static final String COOKIE_PREF = "cookies_prefs"; private Context mContext; public AddCookiesInterceptor(Context context) { mContext = context; } @Override public Response intercept(Chain chain) throws IOException { Request request = chain.request(); Request.Builder builder = request.newBuilder(); String cookie = getCookie("", "gfan.com"); if (!TextUtils.isEmpty(cookie)) { builder.removeHeader("cookie"); builder.addHeader("cookie", cookie); } return chain.proceed(builder.build()); } private String getCookie(String url, String domain) { SharedPreferences sp = mContext.getSharedPreferences(COOKIE_PREF, Context.MODE_PRIVATE); if (!TextUtils.isEmpty(domain)&&sp.contains(domain) && !TextUtils.isEmpty(sp.getString(domain, ""))) { return sp.getString(domain, ""); } return null; }}最后在设置一下这两个拦截器即可
代码如下：
OkHttpClient.Builder builder = new OkHttpClient.Builder(); builder.connectTimeout(TIME_OUT, TimeUnit.SECONDS); builder.addInterceptor(new AddCookiesInterceptor(MYApplication.appContext)); builder.addInterceptor(new SaveCookiesInterceptor(MYApplication.appContext)); ``` 参考文章：[急速开发系列——Retrofit实现持久化Cookie的三种方案](http://www.2cto.com/kf/201609/548735.html)更多相关文章
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