OkHttp3--CookieJar 持久化Cookie

OkHttp3--CookieJar 持久化Cookie

Okhttp3默认是不持久化Cookie的，想要持久化Cookie就要实现CookieJar接口，并且设置他

OkHttpClient.Builder builder = new OkHttpClient.Builder();
builder.cookieJar(new PersistenceCookieJar());

简单实现CookieJar接口

public class PersistenceCookieJar implements CookieJar {
            
            List<Cookie> cache = new ArrayList<>();
            
            //Http请求结束，Response中有Cookie时候回调
            @Override
            public void saveFromResponse(HttpUrl url, List<Cookie> cookies) {
                //内存中缓存Cookie
                cache.addAll(cookies);
            }

            //Http发送请求前回调，Request中设置Cookie
            @Override
            public List<Cookie> loadForRequest(HttpUrl url) {
                //过期的Cookie
                List<Cookie> invalidCookies = new ArrayList<>();
                //有效的Cookie
                List<Cookie> validCookies = new ArrayList<>();
                
                for (Cookie cookie : cache) {
                    
                    if (cookie.expiresAt() < System.currentTimeMillis()) {
                        //判断是否过期
                        invalidCookies.add(cookie);
                    } else if (cookie.matches(url)) {
                        //匹配Cookie对应url
                        validCookies.add(cookie);
                    }
                }
                
                //缓存中移除过期的Cookie
                cache.removeAll(invalidCookies);
                
                //返回List<Cookie>让Request进行设置
                return validCookies;
            }
        };
}

上面代码只是在运行时缓存了Cookie，当App退出的时候Cookie就不存在了。所以我们可以改进一下添加在本地中缓存Cookie的功能

Cookie中数据如何缓存到本地？

我们先来看看Okhttp3的Cookie类

public final class Cookie {
    
    ......
    
    private final String name;
    private final String value;
    private final long expiresAt;
    private final String domain;
    private final String path;
    private final boolean secure;
    private final boolean httpOnly;
    private final boolean persistent; // True if 'expires' or 'max-age' is present.
    private final boolean hostOnly; // True unless 'domain' is present.
    
    ......
}

我们仅需缓存这些参数到本地就好了