java 中OkHttp的使用方法及实例
概述
准备研究Retrofit,而它是依赖OkHttp的,所以先使用一下OkHttp,不深究源码,只探究使用方法。以后有机会再翻查源码。
在进行之前,首先需要2个jar包,其中一个是okHttp的jar包,github上可以下载,另一个是它的依赖包,这个很关键,没有它,项目就无法运行。
OkHttp请求的2种方式
不难猜测,涉及到网络请求,那么无非2种方式,一种是使用回调,另一种则是开启子线程执行。
第一种:开启子线程执行
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OkHttpClient client = new OkHttpClient(); Request build = new Request.Builder().url(url).build(); try { <span style= "white-space:pre" > </span>Response execute = client.newCall(build).execute(); if (execute.isSuccessful()){ System.out.println( "wisely aaa" ); } else { System.out.println( "wisely bbb" ); } } catch (IOException e) { e.printStackTrace(); } |
第二种:使用回调,我个人最喜欢使用这种。(PS:觉得自己真是too young too simple!!本来以为回调的方法是在主线程,结果发现,竟然是子线程,子线程....)
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OkHttpClient client = new OkHttpClient(); Request build = new Request.Builder().url(url).build(); client.newCall(build).enqueue( new Callback() { @Override public void onResponse(Response arg0) throws IOException { System.out.println( "wisely success" ); } @Override public void onFailure(Request arg0, IOException arg1) { System.out.println( "wisely failure" ); } }); |
OkHttp之get请求
1、获取图片
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OkHttpClient client = new OkHttpClient(); Request build = new Request.Builder().url(url).build(); client.newCall(build).enqueue( new Callback() { @Override public void onResponse(Response response) throws IOException { // byte[] bytes = response.body().bytes(); InputStream is = response.body().byteStream(); Options options = new BitmapFactory.Options(); options.inSampleSize = 8 ; // Bitmap bitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.length,options); Bitmap bitmap = BitmapFactory.decodeStream(is, null , options); Message msg = handler.obtainMessage(); msg.obj = bitmap; handler.sendMessage(msg); } @Override public void onFailure(Request arg0, IOException arg1) { System.out.println( "wisely fail:" +arg1.getCause().getMessage()); } }); |
只写了关键代码,并未写handler的相关代码。
获取网络图片有2种方式,1是获取byte数组,2是获取输入流。注意,onResponse在子线程中...
OkHttp之post请求
比起get请求,post请求的分类略多。
1、首先是最常用的表单提交。
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OkHttpClient client = new OkHttpClient(); RequestBody body = new FormEncodingBuilder() .add( "userName" , "13363114390" ) .add( "password" , "200820e3227815ed1756a6b531e7e0d2" ).build(); Request build = new Request.Builder().url(url).post(body).build(); client.newCall(build).enqueue( new Callback() { @Override public void onResponse(Response response) throws IOException { String lenght = response.header( "Content-Length" ); System.out.println( "wisely--lenght:" + lenght); LoginResponse loginResponse = new Gson().fromJson(response.body().charStream(), LoginResponse. class ); System.out.println( "wisely---" + loginResponse.getMessage()); } @Override public void onFailure(Request arg0, IOException arg1) { System.out.println( "wisely-----fail" ); } }); |
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String tokeId; boolean result; public boolean isResult() { return result; } public void setResult( boolean result) { this .result = result; } public String getMessage() { return message; } public void setMessage(String message) { this .message = message; } public String getTokeId() { return tokeId; } public void setTokeId(String tokeId) { this .tokeId = tokeId; } } |
上面的是一个简单的登录表单的提交,其中将返回的json数据封装到了一个bean中。除了能够获取json数据外,还能获取到各个消息头。
2、上传图片
这是我最关心的一个功能,实验证明,okHttp上传图片的功能确实强大,支持多图片上传。
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private MediaType PNG = MediaType.parse( "application/octet-stream" ); |
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OkHttpClient client = new OkHttpClient(); RequestBody body = new MultipartBuilder() .type(MultipartBuilder.FORM) .addPart(Headers.of( "Content-Disposition" , "form-data; name=\"files\";filename=\"img1.jpg\"" ),RequestBody.create(PNG, file1)) .addPart(Headers.of( "Content-Disposition" , "form-data; name=\"files\";filename=\"img2.jpg\"" ),RequestBody.create(PNG, file2)).build(); Request request = new Request.Builder() <span style= "white-space:pre" > </span>.url(url) .post(body).build(); client.newCall(request).enqueue( new Callback() { @Override public void onResponse(Response response) throws IOException { if (response.isSuccessful()){ UploadPNGResponse uploadPNGResponse = new Gson().fromJson(response.body().charStream(), UploadPNGResponse. class ); String msg = uploadPNGResponse.getMsg(); List<String> list = uploadPNGResponse.getList(); for (String string : list) { System.out.println( "wisely---path:" +string); } } } @Override public void onFailure(Request arg0, IOException arg1) { System.out.println( "wisely---fail--" +arg1.getCause().getMessage()); } }); |
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class UploadPNGResponse{ String msg; boolean result; List<String> list; public String getMsg() { return msg; } public void setMsg(String msg) { this .msg = msg; } public boolean isResult() { return result; } public void setResult( boolean result) { this .result = result; } public List<String> getList() { return list; } public void setList(List<String> list) { this .list = list; } } |
感谢阅读,希望能帮助到大家,谢谢大家对本站的支持!
原文链接:http://blog.csdn.net/u013673799/article/details/49865927