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(); ???????String finalUrl = null; ???????if("M".equals(type)) { ???????????finalUrl = JD_M_HOST+url; ???????}else if("V".equals(type)) { ???????????finalUrl = JD_V_HOST+url; ???????}else { ???????????log.error("TYPE类型只能为M或者V!"); ???????} ????????if (token == true) { ????????????finalUrl = url; ???????} ???????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 ???????????????String content = "【出现返回异常的接口】："+finalUrl + " 【返回HTTP CODE】："+response.message() + " ?【请求的数据】： "+JSON.toJSONString(params); ???????????????shopTools.sendErrorMail("京东实物接口服务器异常返回", content, null); ???????????????if(JDCommonConstant.SUBMIT_ORDER.equals(url) || JDCommonConstant.ORDER_PAY.equals(url)) { ???????????????????//如果是下单或者支付接口 ???????????????????JSONObject orderFail = new JSONObject(); ???????????????????orderFail.put("responseFail", "responseFail"); ???????????????????return orderFail; ???????????????} ?????????????log.info("请求失败，返回信息： "+response.message()); ?????????????return null; ???????????} ???????????????????} catch (IOException e) { ???????????log.info("IOException!!!!!!!"+e.getMessage()); ???????????String content = "【出现IO异常的接口】："+finalUrl + " 【异常原因】："+e.getMessage()+ " ?【请求的数据】： "+JSON.toJSONString(params); ???????????shopTools.sendErrorMail("调用京东实物接口出现IO异常", content, null); ????????????if(JDCommonConstant.SUBMIT_ORDER.equals(url) || JDCommonConstant.ORDER_PAY.equals(url)) { ?????????????????//如果是下单或者支付接口 ?????????????????JSONObject orderFail = new JSONObject(); ?????????????????orderFail.put("IOException", "IOException"); ?????????????????return orderFail; ??????????} ???????????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
OkHTTPClient
原文地址：https://www.cnblogs.com/soul-wonder/p/8868505.html