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();
}
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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" );
}
});
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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());
}
});
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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;
}
}
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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;
}
}
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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