原文章：http://www.koushikdutta.com/AndroidAsync

AndroidAsync


AndroidAsync是一個低級別的網絡協議庫。如果你在找一個容易使用，高級別，Android軟件，http請求庫，可查看Ion庫（它建立在AndroidAsync之上）。標準的Android開發人員對Ion可能更感興趣。


但是如果你在找一個原生的socket。http 客戶端/服務器，WebSocket，和Socket。那Android的IO流庫，AndroidAsync就是你要找的。


特點：
1. 基于NIO。一個線程，有回調驅動。高性能。
2. 所有的操作都返回一個能取消的Future。
3. Socket 客戶端+ Socket 服務端。
4. HTTP 客戶端+服務端。
5. WebSocket 客戶端+服務端。
6. Socket.IO 客戶端。


下載：


下載最新的jar文件（https://search.maven.org/remote_content?g=com.koushikdutta.async&a=androidasync&v=LATEST ）或者通過Maven抓取。
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<dependency><groupId>com.koushikdutta.async</groupId><artifactId>androidasync</artifactId><version>(insert latest version)</version> </dependency>

Gradle配置：

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dependencies {compile 'com.koushikdutta.async:androidasync:2.+' }

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下載url地址返回字符串類型

// url是下載的URL地址。 AsyncHttpClient.getDefaultInstance().getString(url, new AsyncHttpClient.StringCallback() {// 如果可能，任何異常錯誤、結果都會請求回調@Overridepublic void onCompleted(Exception e, AsyncHttpResponse response, String result) {if (e != null) {e.printStackTrace();return;}System.out.println("I got a string: " + result);} });

從url地址下載得到JSON串。

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// url is the URL to download. AsyncHttpClient.getDefaultInstance().getJSONObject(url, new AsyncHttpClient.JSONObjectCallback() {// Callback is invoked with any exceptions/errors, and the result, if available.@Overridepublic void onCompleted(Exception e, AsyncHttpResponse response, JSONObject result) {if (e != null) {e.printStackTrace();return;}System.out.println("I got a JSONObject: " + result);} });

或者得到JSONArrays。

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// url is the URL to download. AsyncHttpClient.getDefaultInstance().getJSONArray(url, new AsyncHttpClient.JSONArrayCallback() {// Callback is invoked with any exceptions/errors, and the result, if available.@Overridepublic void onCompleted(Exception e, AsyncHttpResponse response, JSONArray result) {if (e != null) {e.printStackTrace();return;}System.out.println("I got a JSONArray: " + result);} });

下載url地址得到一個文件。?

AsyncHttpClient.getDefaultInstance().getFile(url, filename, new AsyncHttpClient.FileCallback() {@Overridepublic void onCompleted(Exception e, AsyncHttpResponse response, File result) {if (e != null) {e.printStackTrace();return;}System.out.println("my file is available at: " + result.getAbsolutePath());} });

同時也支持緩存。?

// arguments are the http client, the directory to store cache files, and the size of the cache in bytes參數是http客戶端請求，存儲緩存文件地址，和緩存的字節大小。 ResponseCacheMiddleware.addCache(AsyncHttpClient.getDefaultInstance(),getFileStreamPath("asynccache"),1024 * 1024 * 10);

也可以創建Web sockets:

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AsyncHttpClient.getDefaultInstance().websocket(get, "my-protocol", new WebSocketConnectCallback() {@Overridepublic void onCompleted(Exception ex, WebSocket webSocket) {if (ex != null) {ex.printStackTrace();return;}webSocket.send("a string");webSocket.send(new byte[10]);webSocket.setStringCallback(new StringCallback() {public void onStringAvailable(String s) {System.out.println("I got a string: " + s);}});webSocket.setDataCallback(new DataCallback() {public void onDataAvailable(DataEmitter emitter, ByteBufferList byteBufferList) {System.out.println("I got some bytes!");// note that this data has been readbyteBufferList.recycle();}});} });

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AndroidAsync也支持socket.io(0.9.x版本)

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SocketIOClient.connect(AsyncHttpClient.getDefaultInstance(), "http://192.168.1.2:3000", new ConnectCallback() {@Overridepublic void onConnectCompleted(Exception ex, SocketIOClient client) {if (ex != null) {ex.printStackTrace();return;}client.setStringCallback(new StringCallback() {@Overridepublic void onString(String string) {System.out.println(string);}});client.on("someEvent", new EventCallback() {@Overridepublic void onEvent(JSONArray argument, Acknowledge acknowledge) {System.out.println("args: " + arguments.toString());}});client.setJSONCallback(new JSONCallback() {@Overridepublic void onJSON(JSONObject json) {System.out.println("json: " + json.toString());}});} });

需要上傳多文件表單數據？它同樣可以。?

AsyncHttpPost post = new AsyncHttpPost("http://myservercom/postform.html"); MultipartFormDataBody body = new MultipartFormDataBody(); body.addFilePart("my-file", new File("/path/to/file.txt"); body.addStringPart("foo", "bar"); post.setBody(body); AsyncHttpClient.getDefaultInstance().execute(post, new StringCallback() {@Overridepublic void onCompleted(Exception ex, AsyncHttpResponse source, String result) {if (ex != null) {ex.printStackTrace();return;}System.out.println("Server says: " + result);} });

AndroidAsync同樣可以讓你創建簡單的http服務。?

```java AsyncHttpServer server = new AsyncHttpServer();List<WebSocket> _sockets = new ArrayList<WebSocket>();server.get("/", new HttpServerRequestCallback() { @Override public void onRequest(AsyncHttpServerRequest request, AsyncHttpServerResponse response) { response.send("Hello!!!"); } });// listen on port 5000 server.listen(5000); // browsing http://localhost:5000 will return Hello!!!```

和WebSocket Servers：?

```java server.websocket("/live", new WebSocketRequestCallback() { @Override public void onConnected(final WebSocket webSocket, AsyncHttpServerRequest request) { _sockets.add(webSocket);//Use this to clean up any references to your websocket websocket.setClosedCallback(new CompletedCallback() { @Override public void onCompleted(Exception ex) { try { if (ex != null) Log.e("WebSocket", "Error"); } finally { _sockets.remove(webSocket); } } });webSocket.setStringCallback(new StringCallback() { @Override public void onStringAvailable(String s) { if ("Hello Server".equals(s)) webSocket.send("Welcome Client!"); } });} });//..Sometime later, broadcast! for (WebSocket socket : _sockets) socket.send("Fireball!"); ```

特點：?
所有的API請求都返回Futures。?

Future<String> string = client.getString("http://foo.com/hello.txt"); // this will block, and may also throw if there was an error! String value = string.get();

Futures同樣可以回調。?

Future<String> string = client.getString("http://foo.com/hello.txt"); string.setCallback(new FutureCallback<String>() {@Overridepublic void onCompleted(Exception e, String result) {System.out.println(result);} });

簡短概括：?

client.getString("http://foo.com/hello.txt") .setCallback(new FutureCallback<String>() {@Overridepublic void onCompleted(Exception e, String result) {System.out.println(result);} });

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