OkHttp
android网络框架之OKhttp，一个处理网络请求的开源项目,是安卓端最火热的轻量级框架。
使用
1.get方式
new OkHttpClient -> 构造Request对象 -> newCall ->enqueue or execute
//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.post方式
new OkHttpClient -> 构造RequestBody、指定mimeType -> 构造request
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.自定义Interceptor
@Override
public Response intercept(Chain chain) throws IOException {
Request request=chain.request()
//todo....
Response response=chain.proceed(request)
return response
}
源码
1.创建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.创建Request
代码new 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(request)
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.Dispatcher线程池
/** 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