java | 使用java-websocket进行websocket客户端通信

java | 使用java-websocket进行websocket客户端通信

主要参考：https://www.cnblogs.com/hhhshct/p/9507446.html

使用到了java-websocket这个库，我没有用org的版本，用的是阿里云maven仓库里的版本，主要代码如下：

package mz.nochat.core;


import com.pusher.java_websocket.client.WebSocketClient;
import com.pusher.java_websocket.handshake.ServerHandshake;

import java.net.URI;
import java.net.URISyntaxException;
import java.util.Iterator;

// 这个类用于和nochat服务器进行连接和交互
public class MzWebSocketClient extends WebSocketClient {
    public MzWebSocketClient(String url) throws URISyntaxException{
        super(new URI(url));
    }

    @Override
    public void onOpen(ServerHandshake serverHandshake) {
        System.out.println("onOpen: 连接握手");
        for(Iterator<String> it = serverHandshake.iterateHttpFields(); it.hasNext();) {
            String key = it.next();
            System.out.println(key+":"+serverHandshake.getFieldValue(key));
        }
    }

    @Override
    public void onMessage(String s) {
        System.out.println("接收到消息："+s);
    }

    @Override
    public void onMessage(java.nio.ByteBuffer bytes){
        System.out.println("收到字节流消息...");
    }

    @Override
    public void onClose(int i, String s, boolean b) {
        System.out.println("连接关闭...");
        // 尝试重连
        //...
    }

    @Override
    public void onError(Exception e) {
        System.out.println("异常"+e);
    }
}

使用方式如下：

public static void test_websocket(){
        try{
            MzWebSocketClient client = new MzWebSocketClient("ws://127.0.0.1:2333");
            client.connect();
            while (!client.getReadyState().equals(WebSocket.READYSTATE.OPEN)){
                System.out.println("等待连接...");
            }
            System.out.println("连接成功!");
            System.out.println("发送登录包...");
            client.send("{\"cmd\":1, \"data\":{\"uname\":\"mz1\",\"passwd\":\"123456\"}}");
        }catch (URISyntaxException e){
            e.printStackTrace();
        }
}

整个客户端的连接会在一个新的线程里面运行，所以主线程只要负责接收啥的应该就可以了。

当然，有时候为了能够使用全局变量啥的，可以直接写匿名内部类：

package mz.nochat.core;

import com.pusher.java_websocket.WebSocket;
import com.pusher.java_websocket.client.WebSocketClient;
import com.pusher.java_websocket.handshake.ServerHandshake;

import java.net.URI;
import java.net.URISyntaxException;
import java.util.Iterator;

public class NoChatClient {
    public WebSocketClient client;
    // 初始化这个类的时候就会直接连接上
    public NoChatClient(String url){
        try {
            client = new WebSocketClient(new URI(url)) {
                @Override
                public void onOpen(ServerHandshake serverHandshake) {
                    System.out.println("onOpen: 连接握手");
                    for(Iterator<String> it = serverHandshake.iterateHttpFields(); it.hasNext();) {
                        String key = it.next();
                        System.out.println(key+":"+serverHandshake.getFieldValue(key));
                    }
                }

                @Override
                public void onMessage(String s) {
                    System.out.println("接收到消息："+s);
                }

                @Override
                public void onClose(int i, String s, boolean b) {
                    System.out.println("连接关闭...");
                    // 尝试重连
                    //...
                }

                @Override
                public void onError(Exception e) {
                    System.out.println("异常"+e);
                }
            };
            client.connect();
            // 直到连接成功再返回
            while (!client.getReadyState().equals(WebSocket.READYSTATE.OPEN)){
                System.out.println("等待连接...");
            }
        } catch (URISyntaxException e) {
            e.printStackTrace();
        }
    }

    // 发送登录包
    public void login(String uname, String passwd){

    }

    public static void main(String[] args) {
        NoChatClient c = new NoChatClient("ws://127.0.0.1:2333");
    }
}