通过 Tomcat 获取 Websocket 的远程客户端 IP_从 org.apache.tomcat.websocket.pojo.pojoendpoint.me

  因为 websocket 的连接只有 session，所以需要借助 tomcat 来获取远程的客户端 IP。程序如下所示：

package com.maxvision.maxects.util;

import javax.websocket.RemoteEndpoint;
import javax.websocket.Session;
import java.lang.reflect.Field;
import java.net.InetSocketAddress;

public class WebsocketUtil {

	/*
     * 通过 websocket 的 session 来获取远程客户端的 IP
     */
    public static InetSocketAddress getRemoteAddress(Session session) {
        if (session == null) {
            return null;
        }
        RemoteEndpoint.Async async = session.getAsyncRemote();

        InetSocketAddress addr = (InetSocketAddress) getFieldInstance(async,"base#socketWrapper#socket#sc#remoteAddress");
        return addr;
    }

    private static Object getFieldInstance(Object obj, String fieldPath) {
        String fields[] = fieldPath.split("#");
        for (String field : fields) {
            obj = getField(obj, obj.getClass(), field);
            if (obj == null) {
                return null;
            }
        }

        return obj;
    }

    private static Object getField(Object obj, Class<?> clazz, String fieldName) {
        for (; clazz != Object.class; clazz = clazz.getSuperclass()) {
            try {
                Field field;
                field = clazz.getDeclaredField(fieldName);
                field.setAccessible(true);
                return field.get(obj);
            } catch (Exception e) {
            }
        }

        return null;
    }

}

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