文章大纲
一、okhttp基础介绍
二、socket通讯代码实战
三、项目源码下载
四、参考文章
一、okhttp基础介绍
https://www.jianshu.com/p/e3291b7808e7
二、socket通讯代码实战
1. 添加依赖和权限
app的build.gradle下添加okhttp依赖
implementation 'com.squareup.okhttp3:okhttp:3.8.1'
AndroidManifest.xml文件添加网络权限
<uses-permission android:name="android.permission.INTERNET" />
2. 添加布局文件
activity_main.xml文件中代码如下:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<Button
android:id="@+id/start"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="start"
android:textSize="16sp" />
<TextView
android:id="@+id/text"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<Button
android:id="@+id/start2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="start2"
android:textSize="16sp" />
<TextView
android:id="@+id/text2"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
3. MainActivity逻辑实现
package aidl_customer.com.wj.http_socket;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import java.util.concurrent.TimeUnit;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
import okhttp3.WebSocket;
import okhttp3.WebSocketListener;
import okio.ByteString;
/**
* okhttp是3.5以后才添加对WebSocket的支持
*/
public class MainActivity extends AppCompatActivity {
private Button start;
private TextView text;
private Button start2;
private TextView text2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
start = (Button) findViewById(R.id.start);
text = (TextView) findViewById(R.id.text);
start2 = (Button) findViewById(R.id.start2);
text2 = (TextView) findViewById(R.id.text2);
start.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
connect();
}
});
start2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
OkHttpClient client = new OkHttpClient.Builder()
.readTimeout(3, TimeUnit.SECONDS)
.build();
Request request = new Request.Builder()
.url("ws://echo.websocket.org")
.build();
WebSocket webSocket = client.newWebSocket(request, new WebSocketListener() {
@Override
public void onOpen(WebSocket webSocket, Response response) {
super.onOpen(webSocket, response);
}
@Override
public void onMessage(WebSocket webSocket, String text) {
super.onMessage(webSocket, text);
}
@Override
public void onMessage(WebSocket webSocket, ByteString bytes) {
super.onMessage(webSocket, bytes);
}
@Override
public void onClosing(WebSocket webSocket, int code, String reason) {
super.onClosing(webSocket, code, reason);
}
@Override
public void onClosed(WebSocket webSocket, int code, String reason) {
super.onClosed(webSocket, code, reason);
}
@Override
public void onFailure(WebSocket webSocket, Throwable t, Response response) {
super.onFailure(webSocket, t, response);
}
});
}
});
}
/**
*WebSocket官网就提供了相应url可以测试
*/
private void connect() {
//建立连接
EchoWebSocketListener listener = new EchoWebSocketListener();
Request request = new Request.Builder()
.url("ws://echo.websocket.org")
.build();
OkHttpClient client = new OkHttpClient();
client.newWebSocket(request, listener);
client.dispatcher().executorService().shutdown();
}
/**
* 重写了WebSocketListener中的几个方法,这几个方法很好理解,是用来异步回调的,
* 这里简单说一下:onOpen当WebSocket和远程建立连接时回调;两个onMessage就是接收到消息时回调,
* 只是消息内容的类型不同;onClosing是当远程端暗示没有数据交互时回调(即此时准备关闭,但连接还没有关闭);
* onClosed就是当连接已经释放的时候被回调;onFailure当然是失败时被回调(包括连接失败,发送失败等)。
*
* send用来发送消息;close用来关闭连接
*/
private final class EchoWebSocketListener extends WebSocketListener {
@Override
public void onOpen(WebSocket webSocket, Response response) {
webSocket.send("hello world");
webSocket.send("welcome");
webSocket.send(ByteString.decodeHex("adef"));
webSocket.close(1000, "再见");
}
@Override
public void onMessage(WebSocket webSocket, String text) {
output("onMessage: " + text);
}
@Override
public void onMessage(WebSocket webSocket, ByteString bytes) {
output("onMessage byteString: " + bytes);
}
@Override
public void onClosing(WebSocket webSocket, int code, String reason) {
webSocket.close(1000, null);
output("onClosing: " + code + "/" + reason);
}
@Override
public void onClosed(WebSocket webSocket, int code, String reason) {
output("onClosed: " + code + "/" + reason);
}
@Override
public void onFailure(WebSocket webSocket, Throwable t, Response response) {
output("onFailure: " + t.getMessage());
}
}
private void output(final String content) {
runOnUiThread(new Runnable() {
@Override
public void run() {
text.setText(text.getText().toString() + content + "\n");
}
});
}
}
温馨提示:
(1)EchoWebSocketListener继承OkHttp中的抽象类WebSocketListener,重写了几个方法,是用来异步回调的,这里简单说一下:onOpen当WebSocket和远程建立连接时回调;两个onMessage就是接收到消息时回调,只是消息内容的类型不同;onClosing是当远程端暗示没有数据交互时回调(即此时准备关闭,但连接还没有关闭);onClosed就是当连接已经释放的时候被回调;onFailure当然是失败时被回调(包括连接失败,发送失败等)。
(2)send用来发送消息;close用来关闭连接
(3)WebSocket官网就提供了相应url可以测试,测试地址为:ws://echo.websocket.org
(4)关闭连接方式,OkHttp提供两个方法来关闭连接:
1)close webSocket.close(0, “bye”);请求服务器优雅地关闭连接然后等待确认。在关闭之前,所有已经在队列中的消息将被传送完毕。 既然涉及到交互,那么socket可能不会立即关闭。如果初始化和关闭连接是和Activity的生命周期绑定的(比如onPause/onResume),有一些消息可能是在close被调用之后接收到,所以这需要小心去处理。
2)cancel;cancel更加残忍:它会丢弃所有已经在队列中的消息然后残忍地关闭socket。这样也有优点:不必等待家政(housekeeping)和已在队列中消息的传送。然而,选择cancel还是close取决于使用场景。
4. 项目运行与访问
安装apk后,运行主页面如下:
点击START按钮,出现以下结果
三、项目源码下载
链接:https://pan.baidu.com/s/1t8OmZy8WLZr2aKI8S2XcwQ
提取码:jwzi