retrofit2设置超时_【原创】「Android」Retrofit2.0+okhttp3 动态设置接口超时时间

前言不搭后语：

自上次简书要求更新发布文章需要用户绑定微信和手机号，着实被恶心了一下下，也说过不再此处更新了。但现在想想，谁不是已经被扒的底裤都没了，这点隐私的抗争无非是给施暴者增加点情趣而已，穿上裤子，生活还得继续，文章还得继续写，此刻真香。

正题

一般设置超时时间的方法：

OkHttpClient.Builder builder = new OkHttpClient().newBuilder();

builder.readTimeout(20, TimeUnit.SECONDS);

builder.connectTimeout(10, TimeUnit.SECONDS).build();

Retrofit retrofit =new Retrofit.Builder().baseUrl("")

.client(client).build();

retrofit.create(ApiService.class);

但某些时候，我们需要针对单个的接口进行动态设置超时时间。网上能找到的答案基本都是拦截器+反射实现：

创建一个新的OkHttpClient，重新设置超时时间。

通过反射机制拿到对应的属性重新设置起时间值。

以上两种方法，第一种没试过，因为觉得不够优雅。

第二种网上的做法如下，是我根据网上看到的实现的：

/**

* Created by ing on 2019/3/6

* 动态设置接口请求超时时间

*/

public class DynamicTimeoutInterceptor implements Interceptor {

@Override

public Response intercept(Chain chain) throws IOException {

Request oldRequest = chain.request();

setDynamicTimeout(oldRequest,okhttpclient);//这里是你当前的okhttpclient对象

Request newRequest = oldRequest.newBuilder()

.method(oldRequest.method(), oldRequest.body())

.url(oldRequest.url())

.build();

return chain.proceed(newRequest);

}

/**

* 根据所需接口、进行动态设置网络超时时间

*

* @param oldRequest

// * @param retrofit

*/

private void setDynamicTimeout(Request oldRequest,OkHttpClient client) {

final String questUrl = oldRequest.url().url().toString();

try {

//设置连接超时,注意混淆规则，避免字段被混淆

boolean isCloseApi = questUrl.contains(PayApi.API_CLOSEORDER);

boolean isPollingApi = questUrl.contains(PayApi.API_POLLING);

if (isCloseApi||isPollingApi){

Field readTimeoutField = client.getClass().getDeclaredField("readTimeout");

readTimeoutField.setAccessible(true);

//设置读写超时

Field connectTimeoutField = client.getClass().getDeclaredField("connectTimeout");

connectTimeoutField.setAccessible(true);

//过滤接口，重新设置超时时间

if (isCloseApi) {

connectTimeoutField.setInt(client, TimeOut.CLOSE_CONNECT);

readTimeoutField.setInt(client, TimeOut.CLOSE_READ);

} else if (isPollingApi) {

readTimeoutField.setInt(client, TimeOut.POLLING_READ );

}else {

readTimeoutField.setInt(client, TimeOut.DEFALT_READ );

}

}

} catch (IllegalAccessException e) {

e.printStackTrace();

} catch (NoSuchFieldException e) {

e.printStackTrace();

} catch (Exception e) {

e.printStackTrace();

}

}

}

以上方法测试无效，究其原因是因为反射拿到的属性是final的，所以即便拿到也无法修改，这里感谢评论里epitomizelu

解惑。

后来查看chain 接口内容，发现其内就已提供了对应的超时时间设置接口方法：

/**

* Observes, modifies, and potentially short-circuits requests going out and the corresponding

* responses coming back in. Typically interceptors add, remove, or transform headers on the request

* or response.

*/

public interface Interceptor {

Response intercept(Chain chain) throws IOException;

interface Chain {

Request request();

Response proceed(Request request) throws IOException;

/**

* Returns the connection the request will be executed on. This is only available in the chains

* of network interceptors; for application interceptors this is always null.

*/

@Nullable Connection connection();

Call call();

int connectTimeoutMillis();

Chain withConnectTimeout(int timeout, TimeUnit unit); //重点在这

int readTimeoutMillis();

Chain withReadTimeout(int timeout, TimeUnit unit);//重点在这

int writeTimeoutMillis();

Chain withWriteTimeout(int timeout, TimeUnit unit);//重点在这

}

}

可以看到对应的三种超时时间都有提供，哦了，那我们就通过这个来设置一下，最终代码如下：

/**

* Created by ing on 2019/3/6

* 动态设置接口请求超时时间

*/

public class DynamicTimeoutInterceptor implements Interceptor {

@Override

public Response intercept(Chain chain) throws IOException {

Request reequest = chain.request();

String questUrl = reequest.url().toString();

boolean isCloseApi = questUrl.contains(PayApi.API_CLOSEORDER);

boolean isPollingApi = questUrl.contains(PayApi.API_POLLING);

if (isCloseApi){

return chain.withConnectTimeout(TimeOut.CLOSE_CONNECT,TimeUnit.SECONDS)

.withReadTimeout(TimeOut.CLOSE_READ,TimeUnit.SECONDS)

.proceed(reequest);

}else if (isPollingApi){

return chain.withReadTimeout(TimeOut.POLLING_READ,TimeUnit.SECONDS)

.proceed(reequest);

}

return chain.proceed(reequest);

}

}

最后别忘了，将此拦截器添加上：

.addInterceptor(new DynamicTimeoutInterceptor())

然后测试 完美！！

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