OkhttpUtils工具类

首先，导入依赖：

compile 'com.squareup.okhttp3:okhttp:3.10.0'

然后请看代码：

package com.example.zym.shopping.utils;

import android.os.Environment;
import android.os.Handler;
import android.util.Log;

import com.google.gson.Gson;

import java.io.File;
import java.io.IOException;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import java.util.logging.LogRecord;

import okhttp3.Cache;
import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.FormBody;
import okhttp3.Interceptor;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
import okhttp3.ResponseBody;

/**
 * Created by eric on 2018/3/31.
 */

public class HttpUtils {
    private static final String TAG = "HttpUtils";
    private static volatile HttpUtils instance;
    public Handler handler = new Handler();
    private OkHttpClient client;
    private Interceptor getAppInterceptor(){
        Interceptor interceptor = new Interceptor() {
            @Override
            public Response intercept(Chain chain) throws IOException {
                Request request = chain.request();
                Log.e("++++++++++","拦截前");
                //---------请求之前------------
                Response response = chain.proceed(request);
                Log.e("++++++++++","拦截后");
                //---------请求之后------------
                return response;
            }
        };
        return interceptor;
    }
    private HttpUtils() {
        File file = new File(Environment.getExternalStorageDirectory(), "cache11");
        client = new OkHttpClient().newBuilder()
                .readTimeout(3000, TimeUnit.SECONDS)   //设置读取超时时间
                .connectTimeout(3000, TimeUnit.SECONDS) //设置连接的超时时间
                .addInterceptor(getAppInterceptor())//Application拦截器
                .cache(new Cache(file, 10 * 1024))
                .build();
    }
    public static HttpUtils getInstance() {
        if (instance == null) {
            synchronized (HttpUtils.class) {
                if(null == instance) {
                    instance = new HttpUtils();
                }
            }
        }
        return instance;
    }
    public void doGet(String url, final Class clazz, final NetCallBack netCallBack) {
        // 2. 创建一个请求对象
        Request request = new Request.Builder()
                .get()
                .url(url)
                .build();

        // 3. 创建出一个Call对象
        Call call = client.newCall(request);
        call.enqueue(new Callback() {
            @Override
            public void onFailure(Call call, final IOException e) {
                handler.post(new Runnable() {
                    @Override
                    public void run() {
                        netCallBack.onFailure(e);
                    }
                });

            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                // 注意：response.body()只能用一次
//                Log.i(TAG, "onResponse: "+response.body().string());
                String result = response.body().string();

                Gson gson = new Gson();
                final Object o = gson.fromJson(result, clazz);


                handler.post(new Runnable() {
                    @Override
                    public void run() {
                        netCallBack.onSuccess(o);
                    }
                });
//                Log.i(TAG, "onResponse: "+result);
            }
        });
    }
    public void doPost(String url, final Class clazz, Map<String,String> parms, final NetCallBack netCallBack){
        //不是FormBody，而是一个Builder
        FormBody.Builder body = new FormBody.Builder();
        //key   value
        for (String key:parms.keySet()){
            //value的值
            body.add(key,parms.get(key));
        }
        Request request = new Request.Builder()
                .url(url)
                .post(body.build())
                .build();
        // 3. 创建出一个Call对象
        Call call = client.newCall(request);
        call.enqueue(new Callback() {
            @Override
            public void onFailure(Call call, final IOException e) {
                handler.post(new Runnable() {
                    @Override
                    public void run() {
                        netCallBack.onFailure(e);
                    }
                });
            }
            @Override
            public void onResponse(Call call, Response response) throws IOException {
                // 注意：response.body()只能用一次
//                Log.i(TAG, "onResponse: "+response.body().string());
                String result = response.body().string();

                Gson gson = new Gson();
                final Object o = gson.fromJson(result, clazz);


                handler.post(new Runnable() {
                    @Override
                    public void run() {
                        netCallBack.onSuccess(o);
                    }
                });
            }
        });
    }
    public interface NetCallBack {
        void onSuccess(Object o);

        void onFailure(Exception e);
    }
}

-------------------------------------------------------------------------------------------------------------------------------

package com.bwie.categorydemo;

import android.os.Handler;
import android.support.annotation.NonNull;
import android.text.TextUtils;
import android.util.Log;

import com.google.gson.Gson;

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

import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;

/**
* Created by eric on 2018/4/14.
*/

public class OkHttpUtils {
    private static final String TAG = "OkHttpUtils";
    private static volatile OkHttpUtils instance;
    private OkHttpClient client;

    public Handler handler = new Handler();

    private OkHttpUtils() {
        client = new OkHttpClient();
    }

    /**
     * 双重校验锁机制的单例模式
     *
     * @return
     */
    public static OkHttpUtils getInstance() {
        if (instance == null) {
            synchronized (OkHttpUtils.class) {
                if (null == instance) {
                    instance = new OkHttpUtils();
                }
            }
        }
        return instance;
    }

    /**
     * OKHttp的get请求
     * @param url
     * @param map
     * @param clazz
     * @param responseCallBack
     */
    public void get(String url, Map<String, String> map, final Type type, final ResponseCallBack responseCallBack) {
        if (TextUtils.isEmpty(url)) {
            return;
        }
        // 拼接url
        StringBuilder sb = getRealUrl(url, map);
        String str = sb.toString();

        Log.i(TAG, "get url is: " + str);
        // url换成最终拼接好的字符串
        final Request request = new Request.Builder()
                .get()
                .url(str)
                .build();
        Call call = client.newCall(request);
        call.enqueue(new Callback() {
            @Override
            public void onFailure(Call call, final IOException e) {
                handler.post(new Runnable() {
                    @Override
                    public void run() {
                        responseCallBack.failed(e);
                    }
                });
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                String result = response.body().string();

                Gson gson = new Gson();
                final Object o = gson.fromJson(result, type);

                handler.post(new Runnable() {
                    @Override
                    public void run() {
                        responseCallBack.success(o);
                    }
                });

            }
        });
    }

    /**
     * 拼接url
     * @param url
     * @param map
     * @return
     */
    @NonNull
    private StringBuilder getRealUrl(String url, Map<String, String> map) {
        //情况一： url:http://www.baidu.com?name=zs&password=123
        // map=null

        //情况二： url:http://www.baidu.com
        // map: name-zs password-123

        //情况三： url:http://www.baidu.com?
        // map:name-zs password-123
        StringBuilder sb = new StringBuilder();
        sb.append(url);
        // 情况一或情况三，也就是url中有"？"
        if (url.contains("?")) {
            // 情况三：最后一个是问号
            if (url.lastIndexOf("?") == url.length() - 1) {
                for (Map.Entry<String, String> entry : map.entrySet()) {
//                    http://www.baidu.com?name=zs&password=123&
                    sb.append(entry.getKey())
                            .append("=")
                            .append(entry.getValue())
                            .append("&");

                }
                if (sb.toString().contains("&")) {
                    sb.deleteCharAt(sb.lastIndexOf("&"));
                }
            } else {
                // 情况一：最后一个不是问号
                // url:http://www.baidu.com?name=zs&password=123

                if (map != null) {
                    for (Map.Entry<String, String> entry : map.entrySet()) {
                        sb.append("&")
                                .append(entry.getKey())
                                .append("=")
                                .append(entry.getValue());
                    }
                }
            }
        } else {
            // 情况二：不带问号
            //情况二： url:http://www.baidu.com？key=value & key = value
            // map: name-zs password-123

            for (Map.Entry<String, String> entry : map.entrySet()) {
                sb.append("&")
                        .append(entry.getKey())
                        .append("=")
                        .append(entry.getValue());
            }
            if (sb.toString().contains("&")) {
                int index = sb.indexOf("&");
                sb.replace(index, index + 1, "?");
            }

        }
        return sb;
    }

}

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