自己封装的OKhttp请求

package com.create.qdocumentimtest.rxjavatest;

import com.squareup.okhttp.Callback;
import com.squareup.okhttp.FormEncodingBuilder;
import com.squareup.okhttp.OkHttpClient;
import com.squareup.okhttp.Request;
import com.squareup.okhttp.RequestBody;
import com.squareup.okhttp.Response;

import java.io.IOException;
import java.util.HashMap;
import java.util.Objects;

/**
 * Created by Administrator on 2016/6/7 0007.
 */
public class HttpHelper {
    String baseUrl = "";
    private OkHttpClient okhttp = new OkHttpClient();
    private String url;

    public HttpHelper(String url) {
        this.url = url;
    }

    /**
     * get请求 同步方法
     *
     * @return
     */
    public String requestByGetSync() {
        Request request = new Request.Builder().url(url).build();
        try {
            Response response = okhttp.newCall(request).execute();//同步请求
            if (!response.isSuccessful()) {
                throw new IOException("Unexpected code" + response);
            }
            return response.body().string();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * get请求 异步
     *
     * @param callback
     * @return
     */
    public void requestByGetAsync(Callback callback) {
        Request request = new Request.Builder().url(url).build();
        okhttp.newCall(request).equals(callback);
    }

    /**
     * post异步
     *
     * @param callback
     */
    public void requestByPostAsync(HashMap<String, Objects> map, Callback callback) {
        FormEncodingBuilder formEncodingBuilder = new FormEncodingBuilder();
        for (String key : map.keySet()) {
            formEncodingBuilder.add(key, map.get(key) + "");
        }
        RequestBody body = formEncodingBuilder.build();
        Request request = new Request.Builder()
                .url(baseUrl + url)
                .post(body)
                .build();
        okhttp.newCall(request).enqueue(callback);
    }

    /**
     * post 同步请求
     * @param map
     * @return
     */
    public String requestByPostSync(HashMap<String, Objects> map) {
        FormEncodingBuilder formEncodingBuilder = new FormEncodingBuilder();
        for (String key : map.keySet()) {
            formEncodingBuilder.add(key, map.get(key) + "");
        }
        RequestBody body = formEncodingBuilder.build();
        Request request = new Request.Builder()
                .url(url)
                .post(body)
                .build();
        Response response = null;
        try {
            response = okhttp.newCall(request).execute();
            if (response.isSuccessful()) {
                return response.body().string();
            } else {
                throw new IOException("Unexpected code " + response);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }
}