WebSocket（三）Client 同步实现

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WebSocket（三）Client 同步实现，基于 Spring Boot

Client 同步实现

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import lombok.extern.slf4j.Slf4j;
import org.java_websocket.client.WebSocketClient;
import org.java_websocket.drafts.Draft;
import org.java_websocket.drafts.Draft_6455;
import org.java_websocket.handshake.ServerHandshake;

import java.net.URI;
import java.net.URISyntaxException;
import java.nio.ByteBuffer;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.CountDownLatch;

@Slf4j
public class DefaultSyncWebSocketClient<T> extends WebSocketClient {

    private static final int connectTimeout = 2000;
    private static final Draft protocolDraft = new Draft_6455();
    private static final Map<String, String> httpHeaders = new HashMap<>();

    private final Object lock = new Object();
    private Object result = null;
    private CountDownLatch downLatch = null;

    public DefaultSyncWebSocketClient(String serverUri) throws URISyntaxException {
        this(new URI(serverUri));
    }

    public DefaultSyncWebSocketClient(String serverUri, Map<String, String> httpHeaders) throws URISyntaxException {
        this(new URI(serverUri), httpHeaders);
    }

    public DefaultSyncWebSocketClient(URI serverUri) {
        this(serverUri, protocolDraft);
    }

    public DefaultSyncWebSocketClient(URI serverUri, Draft protocolDraft) {
        this(serverUri, protocolDraft, httpHeaders);
    }

    public DefaultSyncWebSocketClient(URI serverUri, Map<String, String> httpHeaders) {
        this(serverUri, protocolDraft, httpHeaders);
    }

    public DefaultSyncWebSocketClient(URI serverUri, Draft protocolDraft, Map<String, String> httpHeaders) {
        this(serverUri, protocolDraft, httpHeaders, connectTimeout);
    }

    public DefaultSyncWebSocketClient(URI serverUri, Draft protocolDraft, Map<String, String> httpHeaders, int connectTimeout) {
        super(serverUri, protocolDraft, httpHeaders, connectTimeout);
        log.debug("构建 DefaultWebSocketClient" +
                "\n\tURI:     {}" +
                "\n\tDraft:   {}" +
                "\n\tHeaders: {}" +
                "\n\ttimeOut: {}", serverUri, protocolDraft, httpHeaders, connectTimeout);
    }

    @SuppressWarnings("unchecked")
    public T sendExt(Object obj) throws RuntimeException {
        log.debug("sendExt…………");
        synchronized (lock){
            try {
                downLatch = new CountDownLatch(1);
                if (obj instanceof String) {
                    send((String) obj);
                }else if (obj instanceof byte[]){
                    send((byte[]) obj);
                }else{
                    throw new RuntimeException("不支持的参数类型");
                }
                downLatch.await();
                return (T) result;
            } catch (InterruptedException e) {
                log.error("连接异常中断 {}", e.getMessage());
                throw new RuntimeException("连接异常中断");
            } finally {
                this.close();
            }
        }
    }

    @Override
    public void onOpen(ServerHandshake handshakedata) {
        log.debug("onOpen…………");
    }

    @Override
    public void onMessage(String message) {
        log.debug("onMessage…………");
        result = message;
        if(downLatch!=null){
            downLatch.countDown();
        }
    }

    @Override
    public void onMessage(ByteBuffer bytes) {
        log.debug("onMessage-bytes…………");
        result = bytes;
        if(downLatch!=null){
            downLatch.countDown();
        }
    }

    @Override
    public void onClose(int code, String reason, boolean remote) {
        log.debug("onClose…………");
    }

    @Override
    public void onError(Exception ex) {
        log.debug("onError………… {}", ex.getMessage());
    }
}

测试

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import lombok.extern.slf4j.Slf4j;

import java.net.URISyntaxException;

@Slf4j
public class TestSync {
    public static void main(String[] args) {
        try {
            DefaultSyncWebSocketClient<String> client = new DefaultSyncWebSocketClient<>("ws://localhost:9716/demo");
            client.connectBlocking();
            String result = client.sendExt("我来了");
            System.out.println("result = " + result);
        } catch (URISyntaxException | InterruptedException e) {
            e.printStackTrace();
        }
    }
}

控制台输出结果

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17:33:03.904 [main] DEBUG com.example.demo.client.DefaultSyncWebSocketClient - 构建 DefaultWebSocketClient
	URI:     ws://localhost:9716/demo
	Draft:   Draft_6455 extension: DefaultExtension max frame size: 2147483647
	Headers: {}
	timeOut: 2000
17:33:04.088 [WebSocketConnectReadThread-12] DEBUG com.example.demo.client.DefaultSyncWebSocketClient - onOpen…………
17:33:04.088 [main] DEBUG com.example.demo.client.DefaultSyncWebSocketClient - sendExt…………
17:33:04.092 [WebSocketConnectReadThread-12] DEBUG com.example.demo.client.DefaultSyncWebSocketClient - onMessage…………
result = Hello, 我来了
17:33:04.093 [WebSocketConnectReadThread-12] DEBUG com.example.demo.client.DefaultSyncWebSocketClient - onClose…………

注意

如果你使用单元测试可能会报错，在注解后面增加以下代码即可
SpringBootTest在启动的时候不会启动服务器，所以WebSocket自然会报错。
这个时候需要添加选项webEnvironment，以便提供一个测试的web环境。
@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.DEFINED_PORT)

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