137 lines
3.5 KiB
Markdown
137 lines
3.5 KiB
Markdown
# Engine.IO-client.java
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[](https://travis-ci.org/nkzawa/engine.io-client.java)
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This is the Engine.IO Client Library for Java, which is simply ported from the [JavaScript client](https://github.com/LearnBoost/engine.io-client).
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See also: [Socket.IO-client.java](https://github.com/nkzawa/socket.io-client.java)
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## Installation
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The latest artifact is available on Maven Central. Add the following dependency to your `pom.xml`.
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```xml
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<dependencies>
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<dependency>
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<groupId>com.github.nkzawa</groupId>
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<artifactId>engine.io-client</artifactId>
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<version>0.3.1</version>
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</dependency>
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</dependencies>
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```
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Or to install it manually, please refer dependencies to [pom.xml](https://github.com/nkzawa/engine.io-client.java/blob/master/pom.xml).
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## Usage
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Engine.IO-client.java has the similar api with the JS client. You can use `Socket` to connect:
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```java
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socket = new Socket("ws://localhost");
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socket.on(Socket.EVENT_OPEN, new Emitter.Listener() {
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@Override
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public void call(Object... args) {
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socket.send("hi");
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socket.close();
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}
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});
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socket.open();
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```
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You can listen events as follows:
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```java
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socket.on(Socket.EVENT_MESSAGE, new Emitter.Listener() {
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@Override
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public void call(Object... args) {
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String data = (String)args[0];
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}
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}).on(Socket.EVENT_ERROR, new Emitter.Listener() {
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@Override
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public void call(Object... args) {
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Exception err = (Exception)args[0];
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}
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});
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```
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How to set options:
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```java
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opts = new Socket.Options();
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opts.transports = new String[] {WebSocket.NAME};
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socket = new Socket(opts);
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```
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Sending and receiving binary data:
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```java
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socket = new Socket();
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socket.on(Socket.EVENT_OPEN, new Emitter.Listener() {
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@Override
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public void call(Object... args) {
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// send binary data
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byte[] data = new byte[42];
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socket.send(data);
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}
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}).on(Socket.EVENT_MESSAGE, new Emitter.Listener() {
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@Override
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public void call(Object... args) {
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// receive binary data
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byte[] data = (byte[])args[0];
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}
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});
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```
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Use custom SSL settings:
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```java
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// default SSLContext for all sockets
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Socket.setDefaultSSLContext(mySSLContext);
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// set as an option
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opts = new Socket.Options();
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opts.sslContext = mySSLContext;
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socket = new Socket(opts);
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```
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## Features
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This library supports all of the features the JS client does, including events, options and upgrading transport. Android is fully supported.
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### Extra features only for Java client
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Some features are added for simulating browser behavior like handling cookies.
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```java
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socket.on(Socket.EVENT_TRANSPORT, new Emitter.listener() {
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@Override
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public void call(Object... args) {
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// Called on a new transport created.
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Transport transport = (Transport)args[0];
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transport.on(Transport.EVENT_REQUEST_HEADERS, new Emitter.Listener() {
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@Override
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public void call(Object... args) {
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@SuppressWarnings("unchecked")
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Map<String, String> headers = (Map<String, String>)args[0];
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// send cookies to server.
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headers.put("Cookie", "foo=1;");
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}
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}).on(Transport.EVENT_RESPONSE_HEADERS, new Emitter.Listener() {
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@Override
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public void call(Object... args) {
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@SuppressWarnings("unchecked")
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Map<String, String> headers = (Map<String, String>)args[0];
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// get cookies from server.
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String cookie = headers.get("Set-Cookie");
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}
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});
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}
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});
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```
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See the Javadoc for more details.
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http://nkzawa.github.io/engine.io-client.java/apidocs/
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## License
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MIT
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