OkHttp
OKhttp, un marco de red de Android, es un proyecto de código abierto para procesar solicitudes de red. Es el marco ligero más popular en el lado de Android.
usar
1. Obtener método
nuevo OkHttpClient -> Construir objeto de solicitud -> newCall -> poner en cola o ejecutar
//同步
String url = "http://wwww.baidu.com"
OkHttpClient okHttpClient = new OkHttpClient()
final Request request = new Request.Builder()
.url(url)
.get()
.build();
Response response= okHttpClient.newCall(request).execute()
String result= response.body().toString
//异步
String url = "http://wwww.baidu.com"
OkHttpClient okHttpClient = new OkHttpClient()
final Request request = new Request.Builder()
.url(url)
.get()
.build()
okHttpClient.newCall(request).enqueue(ne Callback(){
@Override
public void onFailure(Call call, IOException e) {
Log.d(TAG, "onFailure: ");
}
@Override
public void onResponse(Call call, Response response) throws IOException {
Log.d(TAG, "onResponse: " + response.body().string());
}
})
2. Método de publicación
nuevo OkHttpClient -> Construir RequestBody, especificar mimeType -> Construir solicitud
OkHttpClient okHttpClient= new OkHttpClient()
RequestBody requestBody=new FormBody.Builder()
.add("username","danding")
.build()
Request request= new RequestBody.Builder()
.url(url)
.post(requestBody)
.build()
okHttpClient.newCall(request).enqueue(new CallBack(){
@Override
public void onFailure(Call call, IOException e) {
Log.d(TAG, "onFailure: ");
}
@Override
public void onResponse(Call call, Response response) throws IOException
{
Log.d(TAG, "onResponse: " + response.body().string());
}
})
3. Interceptor personalizado
@Override
public Response intercept(Chain chain) throws IOException {
Request request=chain.request()
//todo....
Response response=chain.proceed(request)
return response
}
código fuente
1. Crear OkHttpClient
public OkHttpClient() {
//直接创建的 OkHttpClient对象并且默认构造builder对象进
行初始化
this(new Builder());
}
OkHttpClient(Builder builder) {
this.interceptors = Util.immutableList(builder.interceptors)
...
}
2. Crear una solicitud
Código nuevo Request.Builder().url(url).build()
public final class Request {
public Builder() {
this.method = "GET";
this.headers = new Headers.Builder();
}
public Builder url(String url) {
HttpUrl parsed = HttpUrl.parse(url); //获取scheme、host、port等信息
return url(parsed) //设置this.url成员
}
}
3.okHttpClient.newCall(solicitud)
public class OkHttpClient implements Cloneable, Call.Factory, WebSocket.Factory
{
@Override
public Call newCall(Request request) {
return new RealCall(this, request, false /* for web socket */);
}
}
final class RealCall implements Call {
@Override
public void enqueue(Callback responseCallback) {
synchronized (this) {
if (executed) throw new IllegalStateException("Already Executed");
executed = true;
}
captureCallStackTrace();
client.dispatcher().enqueue(new AsyncCall(responseCallback))
}
}
class AsyncCall extends NamedRunnable{
//implements Runnable
protected void execute() {
try {
Response response = getResponseWithInterceptorChain()//!!!核心
... List<Interceptor> interceptors = new ArrayList<>()
interceptors.addAll(client.interceptors())
interceptors.add(retryAndFollowUpInterceptor)
interceptors.add(new BridgeInterceptor(client.cookieJar()))
interceptors.add(new ConnectInterceptor(client))
interceptors.add(new CallServerInterceptor(forWebSocket))
... Interceptor.Chain chain = new RealInterceptorChain(
interceptors, null, null, null, 0, originalRequest);
return chain.proceed(originalRequest)
... public Response proceed(Request request, StreamAllocation
streamAllocation, HttpCodec httpCodec ,RealConnection connection)
throws IOException {
if (index >= interceptors.size()) throw new AssertionError()
val interceptor=interceptos.get(index)
Response response = interceptor.intercept(next)
}
responseCallback.onResponse(RealCall.this, response)
}
}
4. Grupo de subprocesos del despachador
/** 最大并发请求数为64 */
private int maxRequests = 64;
/** 每个主机最大请求数为5 */
private int maxRequestsPerHost = 5;
/** 线程池 */
private ExecutorService executorService;
/** 准备执行的请求 */
private final Deque<AsyncCall> readyAsyncCalls = new ArrayDeque<>();
/** 正在执行的异步请求，包含已经取消但未执行完的请求 */
private final Deque<AsyncCall> runningAsyncCalls = new ArrayDeque<>();
/** 正在执行的同步请求，包含已经取消单未执行完的请求 */
private final Deque<RealCall> runningSyncCalls = new ArrayDeque<>();
> enqueue //压入请求
synchronized void enqueue(AsyncCall call) {
//maxRequest==64
if (runningAsyncCalls.size() < maxRequests && runningCallsForHost(call) <
maxRequestsPerHost) {
runningAsyncCalls.add(call); //压入正在执行队列
executorService().execute(call);
} else {
readyAsyncCalls.add(call); //压入就绪队列
}
}
5.Interceptor
>BridgeInterceptor -> 添加Content-Type、Content-Length、User-Agent等协议头
>ConnectInterceptor -> ....
>CallServerInterceptor -> 实际发送网络请求