Cookie簡(jiǎn)介

Cookie一般用于后臺(tái)和客戶端數(shù)據(jù)訪問的有效保證，由服務(wù)端創(chuàng)建，客戶端保存，客戶端訪問時(shí)將Cookie保存在請(qǐng)求數(shù)據(jù)header里面，服務(wù)端收到訪問請(qǐng)求后，解析出header的庫(kù)，對(duì)本次請(qǐng)求進(jìn)行有效的驗(yàn)證

Android端整體流程是這樣的，先獲取當(dāng)前請(qǐng)求的 Cookie , 然后進(jìn)行本地持久化存儲(chǔ)。判斷當(dāng)前是否拿到Cookie, 或者本地是否存有 Cookie , 添加到請(qǐng)求頭中，完成操作

移動(dòng)端網(wǎng)絡(luò)庫(kù)一般都是用Retrofit庫(kù)，Retrofit是對(duì)Okhttp的一次很完美的封裝，并且可以自定義Okhttp，我們這里使用的方法就是利用攔截器，攔截每一次請(qǐng)求與訪問，解析收到的數(shù)據(jù)，拿到header里面的Cookie，在把Cookie封裝到每一幀的請(qǐng)求里面去

方法一：

//第一步
//接收攔截器  獲取Cookie
public class ReceivedCookiesInterceptor implements Interceptor {
  @Override
  public Response intercept(Interceptor.Chain chain) throws IOException {
      Response originalResponse = chain.proceed(chain.request());
      if (!originalResponse.headers("Set-Cookie").isEmpty()) {
          //解析Cookie
          for (String header : originalResponse.headers("Set-Cookie")) {
              if(header.contains("JSESSIONID")){
                  NetClient.COOKIE = header.substring(header.indexOf("JSESSIONID"), 
                 header.indexOf(";"));
              }
          }
      }
      return originalResponse;
  }
}

//第二步
//發(fā)送攔截器  添加Cookie到請(qǐng)求頭
public class AddCookiesInterceptor implements Interceptor {
  @Override
  public Response intercept(Chain chain) throws IOException {
      final Request.Builder builder = chain.request().newBuilder();
      //添加Cookie
      if(!TextUtils.isEmpty(NetClient.COOKIE)){
          builder.addHeader("Cookie", NetClient.COOKIE);
      }
      return chain.proceed(builder.build());
  }
}


//第三步 OkHttpClient.Builder添加上面的兩個(gè)攔截器
   static OkHttpClient getClient() {
      OkHttpClient.Builder okBuilder = (new OkHttpClient.Builder()).connectTimeout(5L, TimeUnit.SECONDS);
      okBuilder.addInterceptor(new AddCookiesInterceptor());
      okBuilder.addInterceptor(new ReceivedCookiesInterceptor());
      return okBuilder.build(); 
   }

//第四步 Retrofit 初始化中加入 client 配置：

  mRetrofit = new Retrofit.Builder()
                .baseUrl("https://www.wanandroid.com/")
                .client(client)
                .addConverterFactory(GsonConverterFactory.create())
                .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
                .build();

方法二：

跟方法一樣的,不同寫法。

static OkHttpClient getClient() {
       OkHttpClient.Builder client = new OkHttpClient().newBuilder();
       client.interceptors().add(new Interceptor() {
           @NotNull
           @Override
           public Response intercept(Chain chain) throws IOException {
               // 獲取 Cookie
               Response resp = chain.proceed(chain.request());
               List<String> cookies = resp.headers("Set-Cookie");
               StringBuilder cookieStr = new StringBuilder();
               if (cookies != null && cookies.size() > 0) {
                   for (int i = 0; i < cookies.size(); i++) {
                       cookieStr.append(cookies.get(i));
                   }
                   Log.d("TAG", "獲取 Cookie: "+cookieStr);
                  // UserUtil.saveUserCookieId(cookieStr);
               }
               return resp;
           }
       });
       client.interceptors().add(new Interceptor() {
           @Override
           public Response intercept(Chain chain) throws IOException {
               // 設(shè)置 Cookie
             
             String cookieStr = UserUtil.getCookieId();
             if (EmptyUtil.StringNotEmpty(cookieStr)) {
                 return chain.proceed(chain.request().newBuilder().header("Cookie", cookieStr).build());
              }
               return chain.proceed(chain.request());
           }
       });
     client.connectTimeout(5L, TimeUnit.MILLISECONDS);
//        client.writeTimeout(TIMOUT, TimeUnit.MILLISECONDS);
//        client.readTimeout(TIMOUT, TimeUnit.MILLISECONDS);
       return client.build();
   }

參考文章：
https://blog.csdn.net/jackzhouyu/article/details/79500148
https://blog.csdn.net/lv_fq/article/details/77132273