unity webgl与java的连接案例和代码

Unity WebGL与Java的连接，可以使用WebSocket实现，以下是一个简单的案例和代码：

1. Java代码

import java.io.IOException;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import javax.websocket.OnClose;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.ServerEndpoint;

@ServerEndpoint("/websocket")
public class WebSocketServer {

    private static Set<Session> clients = Collections.synchronizedSet(new HashSet<Session>());

    @OnOpen
    public void onOpen(Session session) {
        clients.add(session);
        System.out.println("Client connected: " + session.getId());
    }

    @OnClose
    public void onClose(Session session) {
        clients.remove(session);
        System.out.println("Client disconnected: " + session.getId());
    }

    @OnMessage
    public void onMessage(String message, Session session) throws IOException {
        // 处理接收到的消息
        System.out.println("Received message from " + session.getId() + ": " + message);
        // 回复消息
        session.getBasicRemote().sendText("Received message: " + message);
    }
}

2. Unity WebGL代码

using UnityEngine;
using WebSocketSharp;
using System;

public class WebSocketClient : MonoBehaviour
{
    WebSocket ws;

    void Start()
    {
        // 连接WebSocket服务器
        ws = new WebSocket("ws://localhost:8080/websocket");
        ws.OnOpen += OnOpenHandler;
        ws.OnMessage += OnMessageHandler;
        ws.OnClose += OnCloseHandler;
        ws.Connect();
    }

    void OnDestroy()
    {
        // 断开WebSocket连接
        ws.Close();
    }

    void Update()
    {
        // 发送消息
        if (Input.GetKeyDown(KeyCode.Space))
        {
            ws.Send("Hello!");
        }
    }

    void OnOpenHandler(object sender, EventArgs e)
    {
        Debug.Log("Connected to WebSocket server.");
    }

    void OnMessageHandler(object sender, MessageEventArgs e)
    {
        // 处理接收到的消息
        Debug.Log("Received message: " + e.Data);
    }

    void OnCloseHandler(object sender, CloseEventArgs e)
    {
        Debug.Log("Disconnected from WebSocket server.");
    }
}

需要注意的是，Unity的WebSocket库需要使用第三方库，如WebSocketSharp。