OkHttp Post请求

依赖

implementation 'com.squareup.okhttp3:okhttp:3.11.0' 
implementation 'com.squareup.okio:okio:1.11.0' 
implementation 'com.squareup.okhttp3:logging- interceptor:3.11.0'

创建工具类

package com.example.wekk3.utils;
import android.os.Handler;
import android.os.Looper;
import com.google.gson.Gson;
import java.io.IOException;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.FormBody;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;
import okhttp3.logging.HttpLoggingInterceptor;
public class OkHttpUtils {

private static volatile OkHttpUtils mInstance; 
private OkHttpClient mClient; 
private Handler mHandler = new Handler(Looper.getMainLooper()); 
/** * 第一步，写一个单例，这里用的懒汉式，也可以使用饿汉 * @return */ 
public static OkHttpUtils getInstance() { 
    if (mInstance == null) { 
        synchronized (OkHttpUtils.class) { 
            if (null == mInstance) { 
                mInstance = new OkHttpUtils(); 
            } 
        } 
    } 
    return mInstance; 
} 
/** * 完成构造方法，OkHttpClient */ 
private OkHttpUtils() { 
    HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor(); 
    interceptor.setLevel(HttpLoggingInterceptor.Level.BODY); 
/** * 使用构造者模式 * 设置连接超时 * 读取超时 * 写超时 * 添加拦截器 */ 
mClient = new OkHttpClient.Builder() 
        .connectTimeout(10, TimeUnit.SECONDS)
        .readTimeout(10, TimeUnit.SECONDS)
        .writeTimeout(10, TimeUnit.SECONDS)
        .addInterceptor(interceptor) .build(); 
} 
/** * 创建异步post方法 
 * * 创建表单FormBody 
 * * 把我们取出的key和value对应的放进去
 * * 最后，build表单，生成RequestBody 
 * * * @param url 请求地址 
 * * @param params
 * * @param clazz 
 * * @param callBack 
 * */ 
public void postEnqueue(final String url, Map<String, String> params, final Class clazz, final CallBack callBack) { 
    FormBody.Builder builder = new FormBody.Builder(); 
       for (Map.Entry<String, String> entry : params.entrySet()) { 
           builder.add(entry.getKey(), entry.getValue()); 
      } 
    RequestBody body = builder.build();
    Request request = new Request.Builder() 
            .post(body) 
            .url(url) 
            .build(); 
    Call call = mClient.newCall(request); 
    call.enqueue(new Callback() { 
        @Override 
        public void onFailure(Call call, final IOException e) { 
            mHandler.post(new Runnable() { 
                @Override public void run() { 
                    callBack.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, clazz); 
            mHandler.post(new Runnable() { 
                @Override 
                public void run() { 
                    callBack.success(o); 
                } 
            }); 
        } 
    }); 
  }
}

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