@Override
    public String toString() {
        return "WebsocketData{"
                + "groupType='"
                + groupType
                + '\''
                + ", eventType='"
                + eventType
                + '\''
                + ", data="
                + data
                + '}';
    }
set data.

@param data data
@return this
shenyu-common/src/main/java/org/apache/shenyu/common/dto/WebsocketData.java