OkHttp不会自动保存session会话,需要我们手动去设置,代码如下

mOkHttpClient = new OkHttpClient.Builder()
    //设置连接超时
    .connectTimeout(CONNECT_TIME_OUT, TimeUnit.SECONDS)
    .readTimeout(READ_TIME_OUT, TimeUnit.SECONDS)
    .writeTimeout(WRITE_TIME_OUT, TimeUnit.SECONDS)
    //设置cookie
    .cookieJar(new CookManager())
    .build();

在builder中设置cookieJar,但是cookieJar是个接口类,自定义一个CookManager类实现CookieJar接口.

public class CookManager implements CookieJar {

    //这里一定一定一定是HashMap<String, List<Cookie>>,是String,不是url.
    private final HashMap<String, List<Cookie>> cookieStore = new HashMap<>();

    @Override
    public void saveFromResponse(HttpUrl url, List<Cookie> cookies) {
        cookieStore.put(url.host(), cookies);
    }

    @Override
    public List<Cookie> loadForRequest(HttpUrl url) {
        List<Cookie> cookies = cookieStore.get(url.host());
        return cookies != null ? cookies : new ArrayList<Cookie>();
    }
}

!!!!!注意注意注意!!!!!!
HashMap的key是String!!!!直接传进去url,是没有效果的!!!!!

如何持久化?

@Override
public void saveFromResponse(HttpUrl url, List<Cookie> cookies) {
//session持久化方法,保存session参数
for (Cookie cookie : cookies) {
    Log.d(TAG, "saveFromResponse() called with: url = [" + url + "], cookies = [" + cookie + "]");
    Log.d("CookManager", "saveFromResponse(CookManager.java:28): " + cookie.name());
    Log.d("CookManager", "saveFromResponse(CookManager.java:28): " + cookie.value());
    Log.d("CookManager", "saveFromResponse(CookManager.java:28): " + cookie.domain());
}

Cookie cookie =new Cookie.Builder()
        .name("JSESSIONID")
        .value("FA69B5065A28377813B58E91004472B7")
        .path("/foundation/")
        .domain("115.29.186.247")
        .build();
cookies = new ArrayList<Cookie>();
cookies.add(cookie);

cookieStore.put(url.host(), cookies);
}

思路如上,保存Cookie基本参数，因业务不同而不同，如我的项目只需保存JSESSIONID,以及对应的值，path需要自己获取,domain不能为空，否则程序直接崩溃。在saveFromResponse方法中进行存储（本地存储），在loadForRequest中获取出来即可。