java.lang.IllegalStateException 因为 okhttp 异步 HTTP POST 请求中的 onResponse 代码

Question

我在这里写了一段代码：

public class Wizard1 extends GuidedStepFragment implements Callback {

    private boolean sendPhoneNumber(String userPhoneNumber) {

        OkHttpClient client = new OkHttpClient();

        RequestBody requestBody = new MultipartBody.Builder()
                .setType(MultipartBody.FORM)
                .addFormDataPart("request_magic_code", Urls.REQUEST_MAGIC_CODE)
                .build();

        Request request = new Request.Builder()
                .url(Urls.HOST + Urls.SEND_PHONE_NUMBER)
                .post(requestBody)
                .build();

        client.newCall(request).enqueue(this);
        return success;
    }

    @Override
    public void onFailure(@NonNull Call call, @NonNull IOException e) {
        e.printStackTrace();
    }

    @Override
    public void onResponse(@NonNull Call call, @NonNull Response response) throws IOException {
        ResponseBody myResponse = response.body();
        Log.d("SS", response.body().string());

    Log.d("SS", response.body().string());

        if (myResponse != null) {
            success = true;
            }

}

当我运行这个时，令人惊讶的是我得到了 java.lang.IllegalStateException。更令人惊奇的是，如果我删除第二行 Log.d，异常将不会发生！

发生了什么事？为什么在 onResponse 中添加虚拟行会导致此错误？

这里是完整的错误日志：

10-24 05:16:38.307 6639-6659/com.example.android.persistence W/System.err: java.lang.IllegalStateException: closed at okio.RealBufferedSource.rangeEquals(RealBufferedSource.java:398) at okio.RealBufferedSource.rangeEquals(RealBufferedSource.java:392) at okhttp3.internal.Util.bomAwareCharset(Util.java:431) at okhttp3.ResponseBody.string(ResponseBody.java:174) 10-24 05:16:38.308 6639-6659/com.example.android.persistence W/System.err:
at android.support.v17.leanback.supportleanbackshowcase.app.wizard.WizardGetPhoneNumber.onResponse(WizardGetPhoneNumber.java:244) at okhttp3.RealCall$AsyncCall.execute(RealCall.java:141) at okhttp3.internal.NamedRunnable.run(NamedRunnable.java:32) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607) at java.lang.Thread.run(Thread.java:761)

Answer 1

来自 Retrofit 响应的正文只能访问一次，在读取后被清除，在您的情况下第二次登录到控制台。

来自文档：

A one-shot stream from the origin server to the client application with the raw bytes of the response body.

有关 official documentation 的更多详细信息。

您应该继续使用保存的 myResponse 变量。

Answer 2

您正在使用 response.body().string() 两次

来自 OkHttp 3 documentation： 响应体只能被消费一次

您可以创建局部变量并使用它

@Override
public void onResponse(@NonNull Call call, @NonNull Response response) throws IOException {
    ResponseBody body = response.body();
    if(body != null) {
        try {
            //Use it anytime you want
            String responseString = body.string();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

或者你可以复制 ResponseBody

@Override
public void onResponse(@NonNull Call call, @NonNull Response response) throws IOException {
    ResponseBody body = response.body();
    //Warning: this method loads the requested bytes into memory. Most
    // applications should set a modest limit on {@code byteCount}, such as 1 MiB.
    int bufferSize = 1024 * 1024;
    ResponseBody copy = response.peekBody(bufferSize);
}

但要注意正确使用bufferSize，防止OutOfMemoryError

P.s。您不需要将字符串记录到 Logcat。有一些更有效的调试 OkHttp 客户端的方法，例如

https://github.com/itkacher/OkHttpProfiler - Android studio 的插件，用于分析 OkHttp 请求
https://www.charlesproxy.com/ - Proxy application for http (setup manual)
http://facebook.github.io/stetho/ - Android 应用程序的调试桥

java.lang.IllegalStateException 因为 okhttp 异步 HTTP POST 请求中的 onResponse 代码

java.lang.IllegalStateException because of onResponse code in okhttp async HTTP POST request

android

retrofit2

okhttp

leanback