目前网上最多的添加公共参数的就是简单的get、与post表单FormBody的公共参数的方法，当遇到一个请求体中有多个requestBody的时候，这时候就不管用。如图：

Paste_Image.png

解决方案如下：

Paste_Image.png

代码见：

import android.util.Log;
import com.windfindtech.icommon.iCommon;
import com.windfindtech.icommon.util.Utils;
import java.io.IOException;
import java.util.List;
import okhttp3.FormBody;
import okhttp3.HttpUrl;
import okhttp3.Interceptor;
import okhttp3.MediaType;
import okhttp3.MultipartBody;
import okhttp3.Request;
import okhttp3.RequestBody;
import okio.Buffer;

/** 后续所有的网络相关公共参数以及缓存配置可以在该类实现
 * Created by hq on 2017/9/12.
 */

public class LogInterceptor implements Interceptor {

public static String TAG = "LogInterceptor";

@Override
public okhttp3.Response intercept(Interceptor.Chain chain) throws IOException {
    Request oldRequest = chain.request();
    Request.Builder newRequestBuild=null;
    String method = oldRequest.method();
    String postBodyString="";
    if("POST".equals(method)){
        RequestBody oldBody = oldRequest.body();
        if(oldBody instanceof FormBody){
            FormBody.Builder formBodyBuilder = new FormBody.Builder();
            formBodyBuilder.add("deviceOs", iCommon.DEVICE_OS);
            formBodyBuilder.add("appVersion", Utils.instance().getAppVersionName());
            formBodyBuilder.add("appName", Utils.instance().getAppNameNew());
            newRequestBuild = oldRequest.newBuilder();

            RequestBody formBody = formBodyBuilder.build();
            postBodyString = bodyToString(oldRequest.body());
            postBodyString += ((postBodyString.length() > 0) ? "&" : "") + bodyToString(formBody);
            newRequestBuild.post(RequestBody.create(MediaType.parse("application/x-www-form-urlencoded;charset=UTF-8"), postBodyString));
        }else if(oldBody instanceof MultipartBody){
            MultipartBody oldBodyMultipart = (MultipartBody)oldBody;
            List<MultipartBody.Part> oldPartList = oldBodyMultipart.parts();
            MultipartBody.Builder builder = new MultipartBody.Builder();
            builder.setType(MultipartBody.FORM);
            RequestBody requestBody1 = RequestBody.create(MediaType.parse("text/plain"), iCommon.DEVICE_OS);
            RequestBody requestBody2 = RequestBody.create(MediaType.parse("text/plain"), Utils.instance().getAppNameNew());
            RequestBody requestBody3 = RequestBody.create(MediaType.parse("text/plain"), Utils.instance().getAppVersionName());
            for (MultipartBody.Part part:oldPartList) {
                builder.addPart(part);
                postBodyString += (bodyToString(part.body()) + "\n");
            }
            postBodyString += (bodyToString(requestBody1) + "\n");
            postBodyString += (bodyToString(requestBody2) + "\n");
            postBodyString += (bodyToString(requestBody3) + "\n");
//              builder.addPart(oldBody);  //不能用这个方法，因为不知道oldBody的类型，可能是PartMap过来的，也可能是多个Part过来的，所以需要重新逐个加载进去
            builder.addPart(requestBody1);
            builder.addPart(requestBody2);
            builder.addPart(requestBody3);
            newRequestBuild = oldRequest.newBuilder();
            newRequestBuild.post(builder.build());
            Log.e(TAG,"MultipartBody,"+oldRequest.url());
        }else{
            newRequestBuild = oldRequest.newBuilder();
        }
    }else {
        // 添加新的参数
        HttpUrl.Builder commonParamsUrlBuilder = oldRequest.url()
            .newBuilder()
            .scheme(oldRequest.url().scheme())
            .host(oldRequest.url().host())
            .addQueryParameter("deviceOs", iCommon.DEVICE_OS)
            .addQueryParameter("appVersion", Utils.instance().getAppVersionName())
            .addQueryParameter("appName", Utils.instance().getAppNameNew());
        newRequestBuild = oldRequest.newBuilder()
            .method(oldRequest.method(), oldRequest.body())
            .url(commonParamsUrlBuilder.build());
    }
    Request newRequest = newRequestBuild
        .addHeader("Accept", "application/json")
        .addHeader("Accept-Language", "zh")
        .build();

    long startTime = System.currentTimeMillis();
    okhttp3.Response response = chain.proceed(newRequest);
    long endTime = System.currentTimeMillis();
    long duration = endTime - startTime;
    okhttp3.MediaType mediaType = response.body().contentType();
    String content = response.body().string();
    int httpStatus = response.code();
    StringBuilder logSB = new StringBuilder();
    logSB.append("-------start:"+method+"|");
    logSB.append(newRequest.toString()+"\n|");
    logSB.append(method.equalsIgnoreCase("POST")?"post参数{"+ postBodyString +"}\n|":"");
    logSB.append("httpCode=" + httpStatus + ";Response:" + content+"\n|");
    logSB.append("----------End:" + duration + "毫秒----------");
    Log.d(TAG,logSB.toString());
    return response.newBuilder()
        .body(okhttp3.ResponseBody.create(mediaType, content))
        .build();
}
private static String bodyToString(final RequestBody request) {
    try {
        final RequestBody copy = request;
        final Buffer buffer = new Buffer();
        if (copy != null)
            copy.writeTo(buffer);
        else
            return "";
        return buffer.readUtf8();
    } catch (final IOException e) {
        return "did not work";
    }
}
}

使用方法（将拦截器添加到OkHttpClient中）：

OkHttpClient.Builder builder = new OkHttpClient.Builder();
    builder.retryOnConnectionFailure(false)
        .cookieJar(s_cookieJar)
        .connectTimeout(DEFAULT_NETWORK_TIMEOUT, TimeUnit.MILLISECONDS)
        .readTimeout(DEFAULT_NETWORK_TIMEOUT, TimeUnit.MILLISECONDS)
        .writeTimeout(DEFAULT_NETWORK_TIMEOUT, TimeUnit.MILLISECONDS)
        .addInterceptor(new LogInterceptor());