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一，OKHttp介绍

okhttp是一个第三方类库，用于android中请求网络。

这是一个开源项目,是安卓端最火热的轻量级框架,由移动支付Square公司贡献(该公司还贡献了Picasso和LeakCanary) 。用于替代HttpUrlConnection和Apache HttpClient(android API23 里已移除HttpClient)。

okhttp有自己的官网，官网网址：OKHttp官网

如果想了解原码可以在github上下载，地址是：https://github.com/square/okhttp

在AndroidStudio、gradle中使用不需要下载jar包，直接添加依赖即可： 
compile ‘com.squareup.okhttp3:okhttp:3.4.1’

项目中遇到的问题：

    public  JSONObject doPost(String url, JSONObject params,Boolean token,String type) { OkHttpClient okHttpClient = new OkHttpClient.Builder()  .connectTimeout(JDCommonConstant.TIME_OUT, TimeUnit.SECONDS)  .readTimeout(JDCommonConstant.TIME_OUT, TimeUnit.SECONDS)  .build();Set<String> iterator = null;MultipartBody.Builder builder  = new MultipartBody.Builder();builder.setType(MultipartBody.FORM);if(params != null) {iterator = params.keySet();for (String str : iterator) {
//                    log.info("当前参数：："+ str + " 类型：" +  params.get(str).getClass());String value = params.getString(str);value=value.startsWith("\"")?value.substring(1,value.length()-1):value;value=value.endsWith("\"")?value.substring(0,value.length()-1):value;value=StringEscapeUtils.unescapeJava(value);
//                    log.info("当前参数的值：："+value +" 长度："+ value.length());
                      builder.addFormDataPart(str, value);}}else {builder.addFormDataPart("token", ""); }RequestBody body = builder.build();Request request = new Request.Builder().url(finalUrl).post(body).build();Call call = okHttpClient.newCall(request);try {Response response = call.execute();if(response.isSuccessful()) {String str = response.body().string();str=str.startsWith("\"")?str.substring(1,str.length()-1):str;str=str.endsWith("\"")?str.substring(0,str.length()-1):str;JSONObject object = JSON.parseObject(str);log.info("接口返回值："+ JSON.toJSONString(object));return object; }else {//请求失败return null;}            } catch (IOException e) {return null;}}

　　结果：无法访问，报错

　　解决：由于公司是内网，需要设置代理，增加代理

　　　　　int proxyPort = 端口号8080;String proxyHost = "代理host";final String username = "";final String password = "";Authenticator proxyAuthenticator = new Authenticator() {@Override public Request authenticate(Route route, Response response) throws IOException {String credential = Credentials.basic(username, password);return response.request().newBuilder().header("Proxy-Authorization", credential).build();}};OkHttpClient okHttpClient = new OkHttpClient.Builder()  .connectTimeout(JDCommonConstant.TIME_OUT, TimeUnit.SECONDS)  .readTimeout(JDCommonConstant.TIME_OUT, TimeUnit.SECONDS)   .proxy(new Proxy(Proxy.Type.HTTP, new InetSocketAddress(proxyHost, proxyPort))).proxyAuthenticator(proxyAuthenticator).build();

okhttp的使用详细介绍：https://blog.csdn.net/larryqingping/article/details/79440665