OkHttp拦截器之获取Response.body的内容

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OkHttp拦截器之获取Response.body的内容

项目中，由于使用了cookie，约定的有效期是20分钟，所以有可以会遇到cookie失效，无权操作，需要再次登录的情况。
在每个地方都进行无权操作error的处理显得不现实，于是就想到了使用拦截器。

但是当使用拦截器获取Response.body.string()后，后面的操作就直接返回Failed了，估计是因为流只能被使用一次的原因。

@Overridepublic Response intercept(Chain chain) throws IOException {        Request request = chain.request();        Response response = chain.proceed(request);        L.i("response.body.string:" + response.body().string());        return response;    }

后来，想到设置的 HttpLoggingInterceptor() 拦截器是如何获取到response的body的数据呢 ?

OkHttpClient client = new OkHttpClient.Builder()                .addInterceptor(new HttpLoggingInterceptor()                        .setLevel(HttpLoggingInterceptor.Level.BODY))                        .build();

于是乎是看了HttpLoggingInterceptor的源码

public final class HttpLoggingInterceptor implements Interceptor {  private static final Charset UTF8 = Charset.forName("UTF-8");  @Override public Response intercept(Chain chain) throws IOException {    Level level = this.level;    Request request = chain.request();    //如果Log Level 级别为NONOE，则不打印，直接返回    if (level == Level.NONE) {      return chain.proceed(request);    }    //是否打印body    boolean logBody = level == Level.BODY;    //是否打印header    boolean logHeaders = logBody || level == Level.HEADERS;    //获得请求body    RequestBody requestBody = request.body();    //请求body是否为空    boolean hasRequestBody = requestBody != null;    //获得Connection，内部有route、socket、handshake、protocol方法    Connection connection = chain.connection();    //如果Connection为null，返回HTTP_1_1，否则返回connection.protocol()    Protocol protocol = connection != null ? connection.protocol() : Protocol.HTTP_1_1;    //比如: --> POST http://121.40.227.8:8088/api http/1.1    String requestStartMessage = "--> " + request.method() + ' ' + request.url() + ' ' + protocol;    if (!logHeaders && hasRequestBody) {      requestStartMessage += " (" + requestBody.contentLength() + "-byte body)";    }    logger.log(requestStartMessage);    //打印 Request    if (logHeaders) {      if (hasRequestBody) {        // Request body headers are only present when installed as a network interceptor. Force        // them to be included (when available) so there values are known.        if (requestBody.contentType() != null) {          logger.log("Content-Type: " + requestBody.contentType());        }        if (requestBody.contentLength() != -1) {          logger.log("Content-Length: " + requestBody.contentLength());        }      }      Headers headers = request.headers();      for (int i = 0, count = headers.size(); i < count; i++) {        String name = headers.name(i);        // Skip headers from the request body as they are explicitly logged above.        if (!"Content-Type".equalsIgnoreCase(name) && !"Content-Length".equalsIgnoreCase(name)) {          logger.log(name + ": " + headers.value(i));        }      }      if (!logBody || !hasRequestBody) {        logger.log("--> END " + request.method());      } else if (bodyEncoded(request.headers())) {        logger.log("--> END " + request.method() + " (encoded body omitted)");      } else {        Buffer buffer = new Buffer();        requestBody.writeTo(buffer);        //编码设为UTF-8        Charset charset = UTF8;        MediaType contentType = requestBody.contentType();        if (contentType != null) {          charset = contentType.charset(UTF8);        }        logger.log("");        if (isPlaintext(buffer)) {          logger.log(buffer.readString(charset));          logger.log("--> END " + request.method()              + " (" + requestBody.contentLength() + "-byte body)");        } else {          logger.log("--> END " + request.method() + " (binary "              + requestBody.contentLength() + "-byte body omitted)");        }      }    }    //打印 Response    long startNs = System.nanoTime();    Response response;    try {      response = chain.proceed(request);    } catch (Exception e) {      logger.log("<-- HTTP FAILED: " + e);      throw e;    }    long tookMs = TimeUnit.NANOSECONDS.toMillis(System.nanoTime() - startNs);    ResponseBody responseBody = response.body();    long contentLength = responseBody.contentLength();    String bodySize = contentLength != -1 ? contentLength + "-byte" : "unknown-length";    //比如 <-- 200 OK http://121.40.227.8:8088/api (36ms)    logger.log("<-- " + response.code() + ' ' + response.message() + ' '        + response.request().url() + " (" + tookMs + "ms" + (!logHeaders ? ", "        + bodySize + " body" : "") + ')');    if (logHeaders) {      Headers headers = response.headers();      for (int i = 0, count = headers.size(); i < count; i++) {        logger.log(headers.name(i) + ": " + headers.value(i));      }      if (!logBody || !HttpEngine.hasBody(response)) {        logger.log("<-- END HTTP");      } else if (bodyEncoded(response.headers())) {        logger.log("<-- END HTTP (encoded body omitted)");      } else {        BufferedSource source = responseBody.source();        source.request(Long.MAX_VALUE); // Buffer the entire body.        Buffer buffer = source.buffer();        Charset charset = UTF8;        MediaType contentType = responseBody.contentType();        if (contentType != null) {          try {            charset = contentType.charset(UTF8);          } catch (UnsupportedCharsetException e) {            logger.log("");            logger.log("Couldn't decode the response body; charset is likely malformed.");            logger.log("<-- END HTTP");            return response;          }        }        if (!isPlaintext(buffer)) {          logger.log("");          logger.log("<-- END HTTP (binary " + buffer.size() + "-byte body omitted)");          return response;        }        if (contentLength != 0) {          logger.log("");          //获取Response的body的字符串 并打印          logger.log(buffer.clone().readString(charset));        }        logger.log("<-- END HTTP (" + buffer.size() + "-byte body)");      }    }    return response;  }  /**   * Returns true if the body in question probably contains human readable text. Uses a small sample   * of code points to detect unicode control characters commonly used in binary file signatures.   */  static boolean isPlaintext(Buffer buffer) throws EOFException {    try {      Buffer prefix = new Buffer();      long byteCount = buffer.size() < 64 ? buffer.size() : 64;      buffer.copyTo(prefix, 0, byteCount);      for (int i = 0; i < 16; i++) {        if (prefix.exhausted()) {          break;        }        int codePoint = prefix.readUtf8CodePoint();        if (Character.isISOControl(codePoint) && !Character.isWhitespace(codePoint)) {          return false;        }      }      return true;    } catch (EOFException e) {      return false; // Truncated UTF-8 sequence.    }  }  private boolean bodyEncoded(Headers headers) {    String contentEncoding = headers.get("Content-Encoding");    return contentEncoding != null && !contentEncoding.equalsIgnoreCase("identity");  }}

然后，根据HttpLoggingInterceptor，就很容易得到responsebody的内容了

/** * @Description 异常处理 拦截器 * Created by EthanCo on 2016/7/14. */public class ErrorHandlerInterceptor implements Interceptor {    private static final Charset UTF8 = Charset.forName("UTF-8");    @Override    public Response intercept(Chain chain) throws IOException {        Request request = chain.request();        Response response = chain.proceed(request);        ResponseBody responseBody = response.body();        long contentLength = responseBody.contentLength();        //注意 >>>>>>>>> okhttp3.4.1这里变成了 !HttpHeader.hasBody(response)        //if (!HttpEngine.hasBody(response)) {         if(!HttpHeader.hasBody(response)){            //END HTTP        } else if (bodyEncoded(response.headers())) {            //HTTP (encoded body omitted)        } else {            BufferedSource source = responseBody.source();            source.request(Long.MAX_VALUE); // Buffer the entire body.            Buffer buffer = source.buffer();            Charset charset = UTF8;            MediaType contentType = responseBody.contentType();            if (contentType != null) {                try {                    charset = contentType.charset(UTF8);                } catch (UnsupportedCharsetException e) {                    //Couldn't decode the response body; charset is likely malformed.                    return response;                }            }            if (!isPlaintext(buffer)) {                L.i("<-- END HTTP (binary " + buffer.size() + "-byte body omitted)");                return response;            }            if (contentLength != 0) {                String result = buffer.clone().readString(charset);                //获取到response的body的string字符串                //do something .... <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<            }            L.i("<-- END HTTP (" + buffer.size() + "-byte body)");        }        return response;    }    static boolean isPlaintext(Buffer buffer) throws EOFException {        try {            Buffer prefix = new Buffer();            long byteCount = buffer.size() < 64 ? buffer.size() : 64;            buffer.copyTo(prefix, 0, byteCount);            for (int i = 0; i < 16; i++) {                if (prefix.exhausted()) {                    break;                }                int codePoint = prefix.readUtf8CodePoint();                if (Character.isISOControl(codePoint) && !Character.isWhitespace(codePoint)) {                    return false;                }            }            return true;        } catch (EOFException e) {            return false; // Truncated UTF-8 sequence.        }    }    private boolean bodyEncoded(Headers headers) {        String contentEncoding = headers.get("Content-Encoding");        return contentEncoding != null && !contentEncoding.equalsIgnoreCase("identity");    }}

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