okhttp通过拦截器输出html源码内容

使用Retrofit加okhttp，如果返回失败的话，callback中response中不能看到失败的网页源码

为此我们有两种方法，通过okhttp拦截器或者retrofit自定义ResponseConvertFactory实现

public class ApiUtil {

    private static final int DEFAULT_TIMEOUT = 5;

    private Retrofit retrofit;

    private EnergySavingService energySavingService;

    private static final  boolean DEBUG = true;


    private ApiUtil(){
        OkHttpClient.Builder builder = new OkHttpClient.Builder();

        // 添加自定义的拦截器
        builder.addInterceptor(new ResponseInterceptor());

        builder.connectTimeout(DEFAULT_TIMEOUT, TimeUnit.SECONDS);
        builder.cookieJar(new CookieJar() {
            private final HashMap<String, List<Cookie>> cookieStore = new HashMap<>();
            @Override
            public void saveFromResponse(HttpUrl url, List<Cookie> cookies) {
                cookieStore.put(url.host(), cookies);
            }

            @Override
            public List<Cookie> loadForRequest(HttpUrl url) {
                List<Cookie> cookies = cookieStore.get(url.host());
                return cookies != null ? cookies : new ArrayList<Cookie>();
            }
        });

        retrofit = new Retrofit.Builder()
                .client(builder.build())
                //这里使用的是自定义的ResponseConvertFactory
                .addConverterFactory(ResponseConvertFactory.create())
                .baseUrl(EnergySavingService.BASE_URL)
                .build();

        以下略
    }

    private static class SingletonHolder{
        private static final ApiUtil INSTANCE = new ApiUtil();
    }

    public static ApiUtil getInstance(){
        return SingletonHolder.INSTANCE;
    }

方法一

ResponseInterceptor .java

public class ResponseInterceptor implements Interceptor {

    @Override
    public Response intercept(Chain chain) throws IOException {
        Request request = chain.request();
        Response response = chain.proceed(request);

        // 以下两句还有点问题
        MediaType mediaType = response.body().contentType();
        // 获取网页源码
        String content = response.body().string(); 

        try{

            Log.d("flag--","intercept(ResponseInterceptor.java:39)-->>"+content);
            check(response);
        }catch (Exception e){
            e.printStackTrace();
        }

        return response.newBuilder()
                .body(ResponseBody.create(mediaType, content))
                .build();
    }
}

方法二

ResponseConvertFactory.java

public class ResponseConvertFactory extends Converter.Factory{
    public static ResponseConvertFactory create() {
        return create(new Gson());
    }

    public static ResponseConvertFactory create(Gson gson) {
        return new ResponseConvertFactory(gson);
    }

    private final Gson gson;

    private ResponseConvertFactory(Gson gson) {
        if (gson == null) throw new NullPointerException("gson == null");
        this.gson = gson;
    }

    @Override
    public Converter<ResponseBody, ?> responseBodyConverter(Type type, Annotation[] annotations,
                                                            Retrofit retrofit) {
        return new GsonResponseBodyConverter<>(gson,type);
    }

}

package com.huanke.cisl.energysaving.util;

import android.util.Log;

import com.google.gson.Gson;

import java.io.IOException;
import java.lang.reflect.Type;

import okhttp3.ResponseBody;
import retrofit2.Converter;


class GsonResponseBodyConverter<T> implements Converter<ResponseBody, T> {
    private final Gson gson;
    private final Type type;

    GsonResponseBodyConverter(Gson gson, Type type) {
        this.gson = gson;
        this.type = type;
    }

    @Override
    public T convert(ResponseBody value) throws IOException {
        String response = value.string();
        // 在这里可以打印出网页源码
         Log.d("flag--","convert(GsonResponseBodyConverter.java:26)-->>"+response);
        return gson.fromJson(response, type);
    }
}

最终效果

参考：
http://blog.youkuaiyun.com/ethanco/article/details/51908479
http://www.jianshu.com/p/d836271b1ae4