Cookie简介
Cookie一般用于后台和客户端数据访问的有效保证，由服务端创建，客户端保存，客户端访问时将Cookie保存在请求数据header里面，服务端收到访问请求后，解析出header的库，对本次请求进行有效的验证
Android端整体流程是这样的，先获取当前请求的 Cookie , 然后进行本地持久化存储。判断当前是否拿到Cookie, 或者本地是否存有 Cookie , 添加到请求头中，完成操作
移动端网络库一般都是用Retrofit库，Retrofit是对Okhttp的一次很完美的封装，并且可以自定义Okhttp，我们这里使用的方法就是利用拦截器，拦截每一次请求与访问，解析收到的数据，拿到header里面的Cookie，在把Cookie封装到每一帧的请求里面去
方法一：
//第一步
//接收拦截器 获取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
//发送拦截器 添加Cookie到请求头
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添加上面的两个拦截器
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：
跟方法一样的,不同写法。
static OkHttpClient getClient() {
OkHttpClient.Builder client = new OkHttpClient().newBuilder();
client.interceptors().add(new Interceptor() {
@NotNull
@Override
public Response intercept(Chain chain) throws IOException {
// 获取 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", "获取 Cookie: "+cookieStr);
// UserUtil.saveUserCookieId(cookieStr);
}
return resp;
}
});
client.interceptors().add(new Interceptor() {
@Override
public Response intercept(Chain chain) throws IOException {
// 设置 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();
}
参考文章：
https://blog.csdn.net/jackzhouyu/article/details/79500148
https://blog.csdn.net/lv_fq/article/details/77132273
