Android OKHTTP的单例和再封装的实例
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2024-01-20 21:29:58
android okhttp的单例和再封装的实例
/**
* created by zm on 16-2-1
* okhttp的再封装,对于2.x版本,3...
android okhttp的单例和再封装的实例
/** * created by zm on 16-2-1 * okhttp的再封装,对于2.x版本,3.x版本将原有对okhttpclient配置 * 改成了builder模式配 * 置,对于超时、代理、dns,okhttp已经做好了配置, * 若不需要特殊配置,可以跳过 */ public class okhttputil { private static okhttpclient singleton; //非常有必要,要不此类还是可以被new,但是无法避免反射,好恶心 private okhttputil(){ } public static okhttpclient getinstance() { if (singleton == null) { synchronized (okhttputil.class) { if (singleton == null) { singleton = new okhttpclient(); } } } return singleton; } }
之前在看okhttp源码的时候,发现square没有对okhttpclient进行单例,网上也没找到合适的解释,以下是自己的猜测
优点:使用单例模式,避免了多次创建所产生的垃圾
缺点:对于一些特殊需求的代码进行一些灵活的配置,单例模式难以实现
总结:做为优秀的开源框架,square出发点是让用户更好更灵活的使用和扩展,从用户角度来说,对于不需要多次配置的项目,可以手动写一个单例模式,便于内存的高效利用
/** * okhttp再次封装 * created by zm on 16-2-1 * update by zm on 16-3-19 增加builder,方便以后内容或者字段的扩展 * */ public class httptools { private context context; private final requestparams req; private final handler handler; public httptools(builder builder) { // todo auto-generated constructor stub context = builder.context; req = builder.req; handler = builder.handler; } public static class builder { private final requestparams req; private final context context; private final handler handler; public builder(requestparams req, context mcontext, handler handler) { // todo auto-generated constructor stub this.req = req; this.context = mcontext; this.handler = handler; } public httptools build() { return new httptools(this); } } public void requestbuilder() { // todo auto-generated method stub if(req==null||context==null||handler==null){ throw new nullpointerexception("nullpointerexception"); } requestget(req, context, handler); } private static void parse(call call, final handler handler, final requestparams req) { // 请求加入调度 call.enqueue(new callback() { @override public void onresponse(call call, response response) throws ioexception { // todo auto-generated method stub string result = response.body().string(); if (result != null) { message message = message.obtain(); message.obj = result; message.what = req.getsuccessmsgwhat(); handler.sendmessage(message); } } @override public void onfailure(call call, ioexception e) { // todo auto-generated method stub handler.sendemptymessage(req.getfailmsgwhat()); } }); } /** * * @param req * @param context * @param handler * * get请求 */ public static void requestget(final requestparams req, final context context, final handler handler) { // 创建一个request final request request = new request.builder().url(req.getrequesturl()).build(); call call = okhttputil.getinstance().newcall(request); parse(call, handler, req); } /** * post请求 */ public static void requestpost(final requestparams req, final context context, final handler handler) { formbody.builder builder = new formbody.builder(); //此处是对requestparams的遍历,requestparams类省略 for (map.entry<string, object> mentry : req.getparamentry()) { string mentrykey = mentry.getkey(); object mentryvalue = mentry.getvalue(); if (textutils.isempty(mentrykey)) { continue; } builder.add(mentrykey, mentryvalue.tostring()); } requestbody body = builder.build(); request request = new request.builder().url(req.geturl()).post(body).build(); call call = okhttputil.getinstance().newcall(request); parse(call, handler, req); } /** * 数据请求的集中管理,方便以后一键替换,从get到post */ public static void request(requestparams req, context mcontext, handler handler) { // todo auto-generated method stub requestget(req, mcontext, handler); } }
最后再奉献上一个封装类
/** * * created by zm on 16-2-1 * 基于gson的json转model封装类 * */ public class jsontomodel { private static string info = "info"; public static string getinfo() { return info; } public static void setinfo(string info) { jsontomodel.info = info; } /** * * @param msg * @param t * model类 * @param model * model对象 * @return */ public static <t> list<t> getjsonarraytomodel(message msg, class<t> t, t model) { // todo auto-generated method stub list<t> list = new arraylist<t>(); try { jsonobject json = new jsonobject(msg.obj.tostring()); for (int i = 0; i < json.getjsonarray(getinfo()).length(); i++) { model = gsonhelper.totype(json.getjsonarray(getinfo()).get(i).tostring(), t); list.add(model); } return list; } catch (exception e) { // todo auto-generated catch block log.e("getjsonarraytomodel", "error"); e.printstacktrace(); } return null; } }
json转model的这个类中,当时没考虑到过多性能的问题,在此类中即使用了org.json.jsonobject也使用了gson,此处还可以做出相应的优化
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